18 results on '"Stephen, Natasha R."'
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2. If You Can't Beat Them, Join Them: Enemy Shells as Refugia from Grazing & Competition PressureS
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Louise, B. Firth, primary, Clubley, Charlotte, additional, McGrath, Alex, additional, Renshaw, Emma, additional, Foggo, Andy, additional, Wilson, Alexander D. M., additional, Gribben, Paul E., additional, Flower, Amy E. A., additional, Burgess, Josh, additional, Heesch, Svenja, additional, Hawkins, Stephen J., additional, Stephen, Natasha R., additional, Haspel, Dan, additional, Spain-Butler, Amy, additional, Stührmann, Sophie, additional, Newstead, Alice, additional, and Knights, Antony M., additional
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- 2023
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3. Dating martian mafic crust; microstructurally constrained baddeleyite geochronology of enriched shergottites Northwest Africa (NWA) 7257, NWA 8679 and Zagami
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Staddon, Leanne G., Darling, James R., Schwarz, Winfried H., Stephen, Natasha R., Schuindt, Sheila, Dunlop, Joseph, and Tait, Kimberly T.
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- 2021
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4. A small S-MIF signal in Martian regolith pyrite: Implications for the atmosphere
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Tomkins, Andrew G., Alkemade, Sarah L., Nutku, Sophie E., Stephen, Natasha R., Finch, Melanie A., and Jeon, Heejin
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- 2020
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5. Investigating the history of volatiles in the solar system using synchrotron infrared micro-spectroscopy
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King, Ashley J., Schofield, Paul F., Stephen, Natasha R., Frogley, Mark D., Cinque, Gianfelice, and Russell, Sara S.
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- 2018
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6. The limitations of hibonite as a single-mineral oxybarometer for early solar system processes
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Berry, Andrew J., Schofield, Paul F., Kravtsova, Antonina N., Miller, Laura A., Stephen, Natasha R., Walker, Andrew M., Soldatov, Alexander V., Ireland, Trevor R., Geraki, K., and Mosselmans, J. Fred W.
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- 2017
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7. Reply to Németh and Garvie: Evidence for lonsdaleite in ureilite meteorites
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Tomkins, Andrew G., primary, Wilson, Nicholas C., additional, MacRae, Colin, additional, Salek, Alan, additional, Field, Matthew, additional, Brand, Helen E. A., additional, Langendam, Andrew D., additional, Stephen, Natasha R., additional, Torpy, Aaron, additional, Pintér, Zsanett, additional, Jennings, Lauren A., additional, and McCulloch, Dougal, additional
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- 2023
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8. The fusion crust of the Winchcombe meteorite: A preserved record of atmospheric entry processes
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Genge, Matthew J., Alesbrook, Luke, Almeida, Natasha V., Bates, Helena C., Bland, Phil A., Boyd, Mark R., Burchell, Mark J., Collins, Gareth S., Cornwell, Luke.T., Daly, Luke, Devillepoix, Hadrien A. R., van Ginneken, Matthias, Greshake, Ansgar, Hallatt, Daniel, Hamann, Christopher, Hecht, Lutz, Jenkins, Laura E., Johnson, Diane, Jones, Rosie, King, Ashley J., Mansour, Haithem, McMullan, Sarah, Mitchell, Jennifer T., Rollinson, Gavyn, Russell, Sara S., Schröder, Christian, Stephen, Natasha R., Suttle, Martin D., Tandy, Jon D., Trimby, Patrick, Sansom, Eleanor K., Spathis, Vassilia, Willcocks, Francesca M., Wozniakiewicz, Penelope J., Genge, Matthew J., Alesbrook, Luke, Almeida, Natasha V., Bates, Helena C., Bland, Phil A., Boyd, Mark R., Burchell, Mark J., Collins, Gareth S., Cornwell, Luke.T., Daly, Luke, Devillepoix, Hadrien A. R., van Ginneken, Matthias, Greshake, Ansgar, Hallatt, Daniel, Hamann, Christopher, Hecht, Lutz, Jenkins, Laura E., Johnson, Diane, Jones, Rosie, King, Ashley J., Mansour, Haithem, McMullan, Sarah, Mitchell, Jennifer T., Rollinson, Gavyn, Russell, Sara S., Schröder, Christian, Stephen, Natasha R., Suttle, Martin D., Tandy, Jon D., Trimby, Patrick, Sansom, Eleanor K., Spathis, Vassilia, Willcocks, Francesca M., and Wozniakiewicz, Penelope J.
- Abstract
Fusion crusts form during the atmospheric entry heating of meteorites and preserve a record of the conditions that occurred during deceleration in the atmosphere. The fusion crust of the Winchcombe meteorite closely resembles that of other stony meteorites, and in particular CM2 chondrites, since it is dominated by olivine phenocrysts set in a glassy mesostasis with magnetite, and is highly vesicular. Dehydration cracks are unusually abundant in Winchcombe. Failure of this weak layer is an additional ablation mechanism to produce large numbers of particles during deceleration, consistent with the observation of pulses of plasma in videos of the Winchcombe fireball. Calving events might provide an observable phenomenon related to meteorites that are particularly susceptible to dehydration. Oscillatory zoning is observed within olivine phenocrysts in the fusion crust, in contrast to other meteorites, perhaps owing to temperature fluctuations resulting from calving events. Magnetite monolayers are found in the crust, and have also not been previously reported, and form discontinuous strata. These features grade into magnetite rims formed on the external surface of the crust and suggest the trapping of surface magnetite by collapse of melt. Magnetite monolayers may be a feature of meteorites that undergo significant degassing. Silicate warts with dendritic textures were observed and are suggested to be droplets ablated from another stone in the shower. They, therefore, represent the first evidence for intershower transfer of ablation materials and are consistent with the other evidence in the Winchcombe meteorite for unusually intense gas loss and ablation, despite its low entry velocity.
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- 2023
9. The Winchcombe meteorite, a unique and pristine witness from the outer solar system
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King, Ashley J, Daly, Luke, Rowe, James, Joy, Katherine H, Greenwood, Richard C, Devillepoix, Hadrien AR, Suttle, Martin D, Chan, Queenie HS, Russell, Sara S, Bates, Helena C, Bryson, James FJ, Clay, Patricia L, Vida, Denis, Lee, Martin R, O'Brien, Áine, Hallis, Lydia J, Stephen, Natasha R, Tartèse, Romain, Sansom, Eleanor K, Towner, Martin C, Cupak, Martin, Shober, Patrick M, Bland, Phil A, Findlay, Ross, Franchi, Ian A, Verchovsky, Alexander B, Abernethy, Feargus AJ, Grady, Monica M, Floyd, Cameron J, Van Ginneken, Matthias, Bridges, John, Hicks, Leon J, Jones, Rhian H, Mitchell, Jennifer T, Genge, Matthew J, Jenkins, Laura, Martin, Pierre-Etienne, Sephton, Mark A, Watson, Jonathan S, Salge, Tobias, Shirley, Katherine A, Curtis, Rowan J, Warren, Tristram J, Bowles, Neil E, Stuart, Finlay M, Di Nicola, Luigia, Györe, Domokos, Boyce, Adrian J, Shaw, Kathryn MM, Elliott, Tim, Steele, Robert CJ, Povinec, Pavel, Laubenstein, Matthias, Sanderson, David, Cresswell, Alan, Jull, Anthony JT, Sýkora, Ivan, Sridhar, Sanjana, Harrison, Richard J, Willcocks, Francesca M, Harrison, Catherine S, Hallatt, Daniel, Wozniakiewicz, Penny J, Burchell, Mark J, Alesbrook, Luke S, Dignam, Aishling, Almeida, Natasha V, Smith, Caroline L, Clark, Brett, Humphreys-Williams, Emma R, Schofield, Paul F, Cornwell, Luke T, Spathis, Vassilia, Morgan, Geraint H, Perkins, Mark J, Kacerek, Richard, Campbell-Burns, Peter, Colas, Francois, Zanda, Brigitte, Vernazza, Pierre, Bouley, Sylvain, Jeanne, Simon, Hankey, Mike, Collins, Gareth S, Young, John S, Shaw, Clive, Horak, Jana, Jones, Dave, James, Nick, Bosley, Steve, Shuttleworth, Alan, Dickinson, Paul, McMullan, Ian, Robson, Derek, Smedley, Andrew RD, Stanley, Ben, Bassom, Richard, McIntyre, Mark, Suttle, Adam A, Fleet, Richard, Bastiaens, Luc, Ihász, Míra B, McMullan, Sarah, Boazman, Sarah J, Dickeson, Zach I, Grindrod, Peter M, Pickersgill, Annemarie E, Weir, Colin J, Suttle, Fiona M, Farrelly, Sarah, Spencer, Ieun, Naqvi, Sheeraz, Mayne, Ben, Skilton, Dan, Kirk, Dan, Mounsey, Ann, Mounsey, Sally E, Mounsey, Sarah, Godfrey, Pamela, Bond, Lachlan, Bond, Victoria, Wilcock, Cathryn, Wilcock, Hannah, Wilcock, Rob, King, Ashley J [0000-0001-6113-5417], Daly, Luke [0000-0002-7150-4092], Joy, Katherine H [0000-0003-4992-8750], Greenwood, Richard C [0000-0002-5544-8027], Devillepoix, Hadrien AR [0000-0001-9226-1870], Suttle, Martin D [0000-0001-7165-2215], Chan, Queenie HS [0000-0001-7205-8699], Russell, Sara S [0000-0001-5531-7847], Bates, Helena C [0000-0002-0469-9483], Bryson, James FJ [0000-0002-5675-8545], Vida, Denis [0000-0003-4166-8704], Lee, Martin R [0000-0002-6004-3622], O'Brien, Áine [0000-0002-2591-7902], Hallis, Lydia J [0000-0001-6455-8415], Stephen, Natasha R [0000-0003-3952-922X], Tartèse, Romain [0000-0002-3490-9875], Sansom, Eleanor K [0000-0003-2702-673X], Towner, Martin C [0000-0002-8240-4150], Cupak, Martin [0000-0003-2193-0867], Shober, Patrick M [0000-0003-4766-2098], Bland, Phil A [0000-0002-4681-7898], Findlay, Ross [0000-0001-7794-1819], Franchi, Ian A [0000-0003-4151-0480], Verchovsky, Alexander B [0000-0002-3532-5003], Abernethy, Feargus AJ [0000-0001-7210-3058], Grady, Monica M [0000-0002-4055-533X], Floyd, Cameron J [0000-0001-5986-491X], Van Ginneken, Matthias [0000-0002-2508-7021], Bridges, John [0000-0002-9579-5779], Hicks, Leon J [0000-0002-2464-0948], Jones, Rhian H [0000-0001-8238-9379], Mitchell, Jennifer T [0000-0002-5922-2463], Genge, Matthew J [0000-0002-9528-5971], Jenkins, Laura [0000-0003-0886-8667], Martin, Pierre-Etienne [0000-0003-1848-9695], Sephton, Mark A [0000-0002-2190-5402], Watson, Jonathan S [0000-0003-0354-1729], Salge, Tobias [0000-0002-4414-4917], Shirley, Katherine A [0000-0003-0669-7497], Curtis, Rowan J [0000-0002-9554-3053], Warren, Tristram J [0000-0003-3877-0046], Bowles, Neil E [0000-0001-5400-1461], Stuart, Finlay M [0000-0002-6395-7868], Di Nicola, Luigia [0000-0002-7596-474X], Györe, Domokos [0000-0003-4438-8361], Boyce, Adrian J [0000-0002-9680-0787], Shaw, Kathryn MM [0000-0002-3847-9382], Elliott, Tim [0000-0002-0984-0191], Steele, Robert CJ [0000-0003-1406-6855], Povinec, Pavel [0000-0003-0275-794X], Laubenstein, Matthias [0000-0001-5390-4343], Sanderson, David [0000-0002-9615-4412], Cresswell, Alan [0000-0002-5100-8075], Jull, Anthony JT [0000-0002-4079-4947], Sýkora, Ivan [0000-0003-3447-5621], Sridhar, Sanjana [0000-0003-1179-2093], Harrison, Richard J [0000-0003-3469-762X], Willcocks, Francesca M [0000-0002-3726-0258], Hallatt, Daniel [0000-0002-4426-9891], Wozniakiewicz, Penny J [0000-0002-1441-4883], Burchell, Mark J [0000-0002-2680-8943], Alesbrook, Luke S [0000-0001-9892-281X], Dignam, Aishling [0000-0001-5408-9061], Almeida, Natasha V [0000-0003-4871-8225], Smith, Caroline L [0000-0001-7005-6470], Humphreys-Williams, Emma R [0000-0002-1397-5785], Schofield, Paul F [0000-0003-0902-0588], Cornwell, Luke T [0000-0003-1428-2160], Spathis, Vassilia [0000-0002-5745-4383], Morgan, Geraint H [0000-0002-7580-6880], Campbell-Burns, Peter [0000-0001-8544-728X], Zanda, Brigitte [0000-0002-4210-7151], Vernazza, Pierre [0000-0002-2564-6743], Bouley, Sylvain [0000-0003-0377-5517], Collins, Gareth S [0000-0002-6087-6149], Young, John S [0000-0001-6583-7643], Horak, Jana [0000-0002-0492-2235], Jones, Dave [0000-0002-7215-0521], Bosley, Steve [0000-0002-9478-8518], Dickinson, Paul [0000-0003-0078-0919], McMullan, Ian [0000-0002-5579-8115], Robson, Derek [0000-0001-7807-9853], Smedley, Andrew RD [0000-0001-7137-6628], McIntyre, Mark [0000-0002-5769-4280], Suttle, Adam A [0000-0002-6075-976X], Fleet, Richard [0000-0002-8366-7673], McMullan, Sarah [0000-0002-7194-6317], Boazman, Sarah J [0000-0003-4694-0818], Dickeson, Zach I [0000-0001-9116-2571], Grindrod, Peter M [0000-0002-0934-5131], Pickersgill, Annemarie E [0000-0001-5452-2849], Suttle, Fiona M [0000-0003-1970-0034], Wilcock, Cathryn [0000-0001-7731-2860], Wilcock, Hannah [0000-0002-1043-2267], Wilcock, Rob [0000-0001-8977-7956], Apollo - University of Cambridge Repository, Science and Technology Facilities Council (STFC), and University of St Andrews. School of Earth & Environmental Sciences
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MCC ,QC Physics ,Multidisciplinary ,5101 Astronomical Sciences ,NDAS ,QB Astronomy ,37 Earth Sciences ,3705 Geology ,5109 Space Sciences ,51 Physical Sciences ,QC ,QB - Abstract
Funding: This study was supported by urgency funding from the U.K.’s Science and Technology Facilities Council (STFC) as part of the project “Curation and Preliminary Examination of the Winchcombe Carbonaceous Chondrite Fall.” Additional work was funded by STFC through grants ST/N000846/1, ST/T002328/1, ST/T506096/1, and ST/W001128/1 (to L.D., M.R.L., and L.J.Ha.); ST/V000675/1 (to K.H.J. and R.H.J.); ST/P005225/1 (to R.T.); ST/S000348/1 (to M.V.G., P.J.W., and M.J.B.); ST/R00143X/1 (to J.B. and L.J.Hi.); ST/S000615/1 (to G.S.C.); ST/V000799/1 (to P.G.); and ST/V000888/1 (to T.E.). A.J.K. and H.C.B. acknowledge funding support from UK Research and Innovation (UKRI) grant MR/T020261/1. P.L.C. acknowledges funding support from UKRI grant MR/S03465X/1. K.H.J. acknowledges funding support from the Royal Society, grant URF\R\201009. L.J.Ha. and M.R.L. acknowledge funding from Natural Environment Research Council (NERC) National Environmental Isotope Facility (NEIF) grant no. 2406.0321. L.D., M.R.L., and L.J.Ha. acknowledge COVID-19 funding support from the University of Glasgow, UK. D.V. was supported in part by NASA cooperative agreement 80NSSC21M0073. P.P. and I.Sy. acknowledge funding from the VEGA agency, project no.1/0421/20. A.J.T.J. acknowledges support from the European Union and the State of Hungary, cofinanced by the European Regional Development Fund in the project of GINOP-2.3.2-15-2016-00009 “ICER.” P.M.S. acknowledges support from the European Union’s Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant agreement no. 945298. FRIPON was initiated by funding from ANR (grant N.13-BS05-0009-03), carried out by the Paris Observatory, Muséum National d’Histoire Naturelle, Paris-Saclay University, and Institut Pythéas (LAM-CEREGE). FRIPON data are hosted and processed at Institut Pythéas SIP (Service Informatique Pythéas). The Desert Fireball Network team and Global Fireball Observatory are funded by the Australian Research Council (DP200102073). Direct links between carbonaceous chondrites and their parent bodies in the solar system are rare. The Winchcombe meteorite is the most accurately recorded carbonaceous chondrite fall. Its pre-atmospheric orbit and cosmic-ray exposure age confirm that it arrived on Earth shortly after ejection from a primitive asteroid. Recovered only hours after falling, the composition of the Winchcombe meteorite is largely unmodified by the terrestrial environment. It contains abundant hydrated silicates formed during fluid-rock reactions, and carbon- and nitrogen-bearing organic matter including soluble protein amino acids. The near-pristine hydrogen isotopic composition of the Winchcombe meteorite is comparable to the terrestrial hydrosphere, providing further evidence that volatile-rich carbonaceous asteroids played an important role in the origin of Earth's water. Publisher PDF
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- 2022
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10. A bullying problem reveals an astronomy and geophysics community in crisis.
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O'Brien, Áine Clare, Kanani, Sheila, Massey, Robert, and Stephen, Natasha R.
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- 2024
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11. The fusion crust of the Winchcombe meteorite: A preserved record of atmospheric entry processes
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Genge, Matthew J., primary, Alesbrook, Luke, additional, Almeida, Natasha V., additional, Bates, Helena C., additional, Bland, Phil A., additional, Boyd, Mark R., additional, Burchell, Mark J., additional, Collins, Gareth S., additional, Cornwell, Luke T., additional, Daly, Luke, additional, Devillepoix, Hadrien A. R., additional, van Ginneken, Matthias, additional, Greshake, Ansgar, additional, Hallatt, Daniel, additional, Hamann, Christopher, additional, Hecht, Lutz, additional, Jenkins, Laura E., additional, Johnson, Diane, additional, Jones, Rosie, additional, King, Ashley J., additional, Mansour, Haithem, additional, McMullan, Sarah, additional, Mitchell, Jennifer T., additional, Rollinson, Gavyn, additional, Russell, Sara S., additional, Schröder, Christian, additional, Stephen, Natasha R., additional, Suttle, Martin D., additional, Tandy, Jon D., additional, Trimby, Patrick, additional, Sansom, Eleanor K., additional, Spathis, Vassilia, additional, Willcocks, Francesca M., additional, and Wozniakiewicz, Penelope J., additional
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- 2023
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12. Sequential Lonsdaleite to Diamond Formation in Ureilite Meteorites via In Situ Chemical Fluid/Vapor Deposition
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Tomkins, Andrew G., primary, Wilson, Nicholas C., additional, MacRae, Colin, additional, Salek, Alan, additional, Field, Matthew R., additional, Brand, Helen E. A., additional, Langendam, Andrew D., additional, Stephen, Natasha R., additional, Torpy, Aaron, additional, Pintér, Zsanett, additional, Jennings, Lauren A., additional, and McCulloch, Dougal G., additional
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- 2022
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13. The occurrence of monoclinic jarosite in natural environments.
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Whitworth, Anne J., Brand, Helen E.A., Wilson, Siobhan A., Grey, Ian E., Stephen, Natasha R., Gozukara, Yesim, and Frierdich, Andrew J.
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JAROSITE ,EXTRATERRESTRIAL life ,X-ray powder diffraction ,RIETVELD refinement ,SPACE groups - Abstract
Jarosite and related subgroup minerals are of high importance in mineral processing, as sources and sinks for metals and acidity in the environment, and they have the potential to preserve elemental and isotopic biomarkers relevant to the search for life in the solar system. The crystal structures and chemistry of jarosite minerals affect their stability and reactivity and thus the roles they play in natural and engineered systems. Rhombohedral symmetry has been documented in natural and synthetic jarosites, whereas monoclinic symmetry has only been documented in synthetic jarosites. This research reports the occurrence of monoclinic symmetry in a natural natrojarosite sample investigated using synchrotron powder X-ray diffraction (PXRD), thermogravimetric analysis (TGA), and electron backscatter diffraction (EBSD). Splitting of several rhombohedral PXRD peaks (e.g., 012, 027, and 033) into pairs of peaks was observed, with the magnitude of the splitting and the relative intensities of the pairs of peaks being almost identical to those reported for synthetic monoclinic jarosite. Rietveld refinement with room-temperature PXRD data shows an ordering of iron-site vacancies on the Fe1 site consistent with monoclinic symmetry, space group C2/m. Conversion of monoclinic unit-cell parameters into pseudo-hexagonal unit-cell parameters, specifically β′, also supports the use of a monoclinic model to describe the natrojarosite structure. Structural analysis with increasing temperature is supportive of the thermal evolution previously described for synthetic monoclinic jarosite samples, with some indications of subtle differences between synthetic and natural materials including slower rates of thermal expansion and absence of FeOHSO
4 peaks for natural monoclinic jarosite. EBSD provides insight into the spatial–structural variation within the hand specimen from which the natrojarosite was sampled, demonstrating that there are areas of unambiguous monoclinic symmetry, but others where both monoclinic and rhombohedral natrojarosite coexist. The results of this study suggest that monoclinic symmetry in natural jarosites may be more prevalent than previous studies suggest. Monoclinic symmetry in jarosites is identifiable by an ordering of iron-site vacancies on the Fe1 site, splitting of specific rhombohedral XRD peaks into pairs of peaks, and an increase in jarosite symmetry (i.e., from monoclinic to rhombohedral) during heating. The splitting of peaks in monoclinic jarosites can be subtle so it is recommended that high-resolution XRD data are collected when studying the crystal structure of jarosites. [ABSTRACT FROM AUTHOR]- Published
- 2023
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14. Deformation Mechanisms in Orogenic Gold Systems During Aseismic Periods: Microstructural Evidence from the Central Victorian Gold Deposits, Southeast Australia
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Hunter, Nicholas J.R., primary, Voisey, Christopher R., additional, Tomkins, Andrew G., additional, Wilson, Christopher J.L., additional, Luzin, Vladimir, additional, and Stephen, Natasha R., additional
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- 2021
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15. CHOS gas/fluid‐induced reduction in ureilites
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Langendam, Andrew D., primary, Tomkins, Andrew G., additional, Evans, Katy A., additional, Wilson, Nicholas C., additional, MacRae, Colin M., additional, Stephen, Natasha R., additional, and Torpy, Aaron, additional
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- 2021
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16. Brecciation at the grain scale within the lithologies of the Winchcombe Mighei‐like carbonaceous chondrite
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Daly, Luke, Suttle, Martin D., Lee, Martin R., Bridges, John, Hicks, Leon, Martin, Pierre‐Etienne M. C., Floyd, Cameron J., Jenkins, Laura E., Salge, Tobias, King, Ashley J., Almeida, Natasha V., Johnson, Diane, Trimby, Patrick W., Mansour, Haithem, Wadsworth, Fabian B., Rollinson, Gavyn, Genge, Matthew J., Darling, James, Bagot, Paul A. J., White, Lee F., Stephen, Natasha R., Mitchell, Jennifer T., Griffin, Sammy, Willcocks, Francesca M., Jones, Rhian, Piazolo, Sandra, Einsle, Joshua F., Macente, Alice, Hallis, Lydia J., O'Brien, Aine, Schofield, Paul F., Russell, Sara S., Bates, Helena, Smith, Caroline, Franchi, Ian, Forman, Lucy V., Bland, Phil A., Westmoreland, David, Anderson, Iain, Taylor, Richard, Montgomery, Mark, Parsons, Mark, Vasseur, Jérémie, van Ginneken, Matthias, Wozniakiewicz, Penelope J., Burchell, Mark J., Hallatt, Daniel, Alesbrook, Luke S., Spathis, Vassilia, Worden, Richard, Behnsen, Julie, Black, Kate, Daly, Luke, Suttle, Martin D., Lee, Martin R., Bridges, John, Hicks, Leon, Martin, Pierre‐Etienne M. C., Floyd, Cameron J., Jenkins, Laura E., Salge, Tobias, King, Ashley J., Almeida, Natasha V., Johnson, Diane, Trimby, Patrick W., Mansour, Haithem, Wadsworth, Fabian B., Rollinson, Gavyn, Genge, Matthew J., Darling, James, Bagot, Paul A. J., White, Lee F., Stephen, Natasha R., Mitchell, Jennifer T., Griffin, Sammy, Willcocks, Francesca M., Jones, Rhian, Piazolo, Sandra, Einsle, Joshua F., Macente, Alice, Hallis, Lydia J., O'Brien, Aine, Schofield, Paul F., Russell, Sara S., Bates, Helena, Smith, Caroline, Franchi, Ian, Forman, Lucy V., Bland, Phil A., Westmoreland, David, Anderson, Iain, Taylor, Richard, Montgomery, Mark, Parsons, Mark, Vasseur, Jérémie, van Ginneken, Matthias, Wozniakiewicz, Penelope J., Burchell, Mark J., Hallatt, Daniel, Alesbrook, Luke S., Spathis, Vassilia, Worden, Richard, Behnsen, Julie, and Black, Kate
- Abstract
The Mighei‐like carbonaceous (CM) chondrites have been altered to various extents by water–rock reactions on their parent asteroid(s). This aqueous processing has destroyed much of the primary mineralogy of these meteorites, and the degree of alteration is highly heterogeneous at both the macroscale and nanoscale. Many CM meteorites are also heavily brecciated juxtaposing clasts with different alteration histories. Here we present results from the fine‐grained team consortium study of the Winchcombe meteorite, a recent CM chondrite fall that is a breccia and contains eight discrete lithologies that span a range of petrologic subtypes (CM2.0–2.6) that are suspended in a cataclastic matrix. Coordinated multitechnique, multiscale analyses of this breccia reveal substantial heterogeneity in the extent of alteration, even in highly aqueously processed lithologies. Some lithologies exhibit the full range and can comprise nearly unaltered coarse‐grained primary components that are found directly alongside other coarse‐grained components that have experienced complete pseudomorphic replacement by secondary minerals. The preservation of the complete alteration sequence and pseudomorph textures showing tochilinite–cronstedtite intergrowths are replacing carbonates suggest that CMs may be initially more carbonate rich than previously thought. This heterogeneity in aqueous alteration extent is likely due to a combination of microscale variability in permeability and water/rock ratio generating local microenvironments as has been established previously. Nevertheless, some of the disequilibrium mineral assemblages observed, such as hydrous minerals juxtaposed with surviving phases that are typically more fluid susceptible, can only be reconciled by multiple generations of alteration, disruption, and reaccretion of the CM parent body at the grain scale.
17. The Winchcombe meteorite, a unique and pristine witness from the outer solar system
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King, Ashley J., Daly, Luke, Rowe, James, Joy, Katherine H., Greenwood, Richard C., Devillepoix, Hadrien A. R., Suttle, Martin D., Chan, Queenie H. S., Russell, Sara S., Bates, Helena C., Bryson, James F. J., Clay, Patricia L., Vida, Denis, Lee, Martin R., O’Brien, Áine, Hallis, Lydia J., Stephen, Natasha R., Tartèse, Romain, Sansom, Eleanor K., Towner, Martin C., Cupak, Martin, Shober, Patrick M., Bland, Phil A., Findlay, Ross, Franchi, Ian A., Verchovsky, Alexander B., Abernethy, Feargus A. J., Grady, Monica M., Floyd, Cameron J., Van Ginneken, Matthias, Bridges, John, Hicks, Leon J., Jones, Rhian H., Mitchell, Jennifer T., Genge, Matthew J., Jenkins, Laura, Martin, Pierre-Etienne, Sephton, Mark A., Watson, Jonathan S., Salge, Tobias, Shirley, Katherine A., Curtis, Rowan J., Warren, Tristram J., Bowles, Neil E., Stuart, Finlay M., Di Nicola, Luigia, Györe, Domokos, Boyce, Adrian J., Shaw, Kathryn M. M., Elliott, Tim, Steele, Robert C. J., Povinec, Pavel, Laubenstein, Matthias, Sanderson, David, Cresswell, Alan, Jull, Anthony J. T., Sýkora, Ivan, Sridhar, Sanjana, Harrison, Richard J., Willcocks, Francesca M., Harrison, Catherine S., Hallatt, Daniel, Wozniakiewicz, Penny J., Burchell, Mark J., Alesbrook, Luke S., Dignam, Aishling, Almeida, Natasha V., Smith, Caroline L., Clark, Brett, Humphreys-Williams, Emma R., Schofield, Paul F., Cornwell, Luke T., Spathis, Vassilia, Morgan, Geraint H., Perkins, Mark J., Kacerek, Richard, Campbell-Burns, Peter, Colas, Francois, Zanda, Brigitte, Vernazza, Pierre, Bouley, Sylvain, Jeanne, Simon, Hankey, Mike, Collins, Gareth S., Young, John S., Shaw, Clive, Horak, Jana, Jones, Dave, James, Nick, Bosley, Steve, Shuttleworth, Alan, Dickinson, Paul, McMullan, Ian, Robson, Derek, Smedley, Andrew R. D., Stanley, Ben, Bassom, Richard, McIntyre, Mark, Suttle, Adam A., Fleet, Richard, Bastiaens, Luc, Ihász, Míra B., McMullan, Sarah, Boazman, Sarah J., Dickeson, Zach I., Grindrod, Peter M., Pickersgill, Annemarie E., Weir, Colin J., Suttle, Fiona M., Farrelly, Sarah, Spencer, Ieun, Naqvi, Sheeraz, Mayne, Ben, Skilton, Dan, Kirk, Dan, Mounsey, Ann, Mounsey, Sally E., Mounsey, Sarah, Godfrey, Pamela, Bond, Lachlan, Bond, Victoria, Wilcock, Cathryn, Wilcock, Hannah, Wilcock, Rob, King, Ashley J., Daly, Luke, Rowe, James, Joy, Katherine H., Greenwood, Richard C., Devillepoix, Hadrien A. R., Suttle, Martin D., Chan, Queenie H. S., Russell, Sara S., Bates, Helena C., Bryson, James F. J., Clay, Patricia L., Vida, Denis, Lee, Martin R., O’Brien, Áine, Hallis, Lydia J., Stephen, Natasha R., Tartèse, Romain, Sansom, Eleanor K., Towner, Martin C., Cupak, Martin, Shober, Patrick M., Bland, Phil A., Findlay, Ross, Franchi, Ian A., Verchovsky, Alexander B., Abernethy, Feargus A. J., Grady, Monica M., Floyd, Cameron J., Van Ginneken, Matthias, Bridges, John, Hicks, Leon J., Jones, Rhian H., Mitchell, Jennifer T., Genge, Matthew J., Jenkins, Laura, Martin, Pierre-Etienne, Sephton, Mark A., Watson, Jonathan S., Salge, Tobias, Shirley, Katherine A., Curtis, Rowan J., Warren, Tristram J., Bowles, Neil E., Stuart, Finlay M., Di Nicola, Luigia, Györe, Domokos, Boyce, Adrian J., Shaw, Kathryn M. M., Elliott, Tim, Steele, Robert C. J., Povinec, Pavel, Laubenstein, Matthias, Sanderson, David, Cresswell, Alan, Jull, Anthony J. T., Sýkora, Ivan, Sridhar, Sanjana, Harrison, Richard J., Willcocks, Francesca M., Harrison, Catherine S., Hallatt, Daniel, Wozniakiewicz, Penny J., Burchell, Mark J., Alesbrook, Luke S., Dignam, Aishling, Almeida, Natasha V., Smith, Caroline L., Clark, Brett, Humphreys-Williams, Emma R., Schofield, Paul F., Cornwell, Luke T., Spathis, Vassilia, Morgan, Geraint H., Perkins, Mark J., Kacerek, Richard, Campbell-Burns, Peter, Colas, Francois, Zanda, Brigitte, Vernazza, Pierre, Bouley, Sylvain, Jeanne, Simon, Hankey, Mike, Collins, Gareth S., Young, John S., Shaw, Clive, Horak, Jana, Jones, Dave, James, Nick, Bosley, Steve, Shuttleworth, Alan, Dickinson, Paul, McMullan, Ian, Robson, Derek, Smedley, Andrew R. D., Stanley, Ben, Bassom, Richard, McIntyre, Mark, Suttle, Adam A., Fleet, Richard, Bastiaens, Luc, Ihász, Míra B., McMullan, Sarah, Boazman, Sarah J., Dickeson, Zach I., Grindrod, Peter M., Pickersgill, Annemarie E., Weir, Colin J., Suttle, Fiona M., Farrelly, Sarah, Spencer, Ieun, Naqvi, Sheeraz, Mayne, Ben, Skilton, Dan, Kirk, Dan, Mounsey, Ann, Mounsey, Sally E., Mounsey, Sarah, Godfrey, Pamela, Bond, Lachlan, Bond, Victoria, Wilcock, Cathryn, Wilcock, Hannah, and Wilcock, Rob
- Abstract
Direct links between carbonaceous chondrites and their parent bodies in the solar system are rare. The Winchcombe meteorite is the most accurately recorded carbonaceous chondrite fall. Its pre-atmospheric orbit and cosmic-ray exposure age confirm that it arrived on Earth shortly after ejection from a primitive asteroid. Recovered only hours after falling, the composition of the Winchcombe meteorite is largely unmodified by the terrestrial environment. It contains abundant hydrated silicates formed during fluid-rock reactions, and carbon- and nitrogen-bearing organic matter including soluble protein amino acids. The near-pristine hydrogen isotopic composition of the Winchcombe meteorite is comparable to the terrestrial hydrosphere, providing further evidence that volatile-rich carbonaceous asteroids played an important role in the origin of Earth’s water.
18. The fusion crust of the Winchcombe meteorite: A preserved record of atmospheric entry processes
- Author
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Genge, Matthew J., Alesbrook, Luke, Almeida, Natasha V., Bates, Helena C., Bland, Phil A., Boyd, Mark R., Burchell, Mark J., Collins, Gareth S., Cornwell, Luke T., Daly, Luke, Devillepoix, Hadrien A. R., van Ginneken, Matthias, Greshake, Ansgar, Hallatt, Daniel, Hamann, Christopher, Hecht, Lutz, Jenkins, Laura E., Johnson, Diane, Jones, Rosie, King, Ashley J., Mansour, Haithem, McMullan, Sarah, Mitchell, Jennifer T., Rollinson, Gavyn, Russell, Sara S., Schröder, Christian, Stephen, Natasha R., Suttle, Martin D., Tandy, Jon D., Trimby, Patrick, Sansom, Eleanor K., Spathis, Vassilia, Willcocks, Francesca M., Wozniakiewicz, Penelope J., Genge, Matthew J., Alesbrook, Luke, Almeida, Natasha V., Bates, Helena C., Bland, Phil A., Boyd, Mark R., Burchell, Mark J., Collins, Gareth S., Cornwell, Luke T., Daly, Luke, Devillepoix, Hadrien A. R., van Ginneken, Matthias, Greshake, Ansgar, Hallatt, Daniel, Hamann, Christopher, Hecht, Lutz, Jenkins, Laura E., Johnson, Diane, Jones, Rosie, King, Ashley J., Mansour, Haithem, McMullan, Sarah, Mitchell, Jennifer T., Rollinson, Gavyn, Russell, Sara S., Schröder, Christian, Stephen, Natasha R., Suttle, Martin D., Tandy, Jon D., Trimby, Patrick, Sansom, Eleanor K., Spathis, Vassilia, Willcocks, Francesca M., and Wozniakiewicz, Penelope J.
- Abstract
Fusion crusts form during the atmospheric entry heating of meteorites and preserve a record of the conditions that occurred during deceleration in the atmosphere. The fusion crust of the Winchcombe meteorite closely resembles that of other stony meteorites, and in particular CM2 chondrites, since it is dominated by olivine phenocrysts set in a glassy mesostasis with magnetite, and is highly vesicular. Dehydration cracks are unusually abundant in Winchcombe. Failure of this weak layer is an additional ablation mechanism to produce large numbers of particles during deceleration, consistent with the observation of pulses of plasma in videos of the Winchcombe fireball. Calving events might provide an observable phenomenon related to meteorites that are particularly susceptible to dehydration. Oscillatory zoning is observed within olivine phenocrysts in the fusion crust, in contrast to other meteorites, perhaps owing to temperature fluctuations resulting from calving events. Magnetite monolayers are found in the crust, and have also not been previously reported, and form discontinuous strata. These features grade into magnetite rims formed on the external surface of the crust and suggest the trapping of surface magnetite by collapse of melt. Magnetite monolayers may be a feature of meteorites that undergo significant degassing. Silicate warts with dendritic textures were observed and are suggested to be droplets ablated from another stone in the shower. They, therefore, represent the first evidence for intershower transfer of ablation materials and are consistent with the other evidence in the Winchcombe meteorite for unusually intense gas loss and ablation, despite its low entry velocity.
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