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177 results on '"Collerson, Kenneth D."'

18. Clay mineralogical, geochemical and isotopic tracing of the evolution of the Woodleigh impact structure, Southern Carnarvon Basin, Western Australia

Author

Uysal, I. Tonguc, Mory, Arthur J., Golding, Suzanne D., Bolhar, Robert, and Collerson, Kenneth D.

Subjects
Feldspar -- Research, Clay -- Research, Mineralogy -- Research, Earth sciences
Abstract

Chaotically structured diamictite from the inner ring syncline surrounding the central uplift of the Woodleigh impact structure contains shocked metamorphic and impact melt-rock fragments, largely derived from Ordovician and Devonian target sandstones. Coarse illite fractions ( 0.2 [micro]m fractions from the diamictite without smectite and K-feldspar cluster around 360 Ma, consistent with Rb-Sr data. Crystallisation of newly formed illite in the impact melt rock clasts and recrystallisation of earlier formed illite in the sandstone clasts preserved in the diamictite, are attributed to impact-induced hydrothermal processes in the Late Devonian. The illitic clays from the diamictite and from the sandstones have very similar trace element compositions, with significantly enriched incompatible lithophile elements, which increase in concentrations correlatively with those of the compatible ferromagnesian elements. The unusual trace element associations in the clays may be due to the involvement of hot gravity-driven basinal fluids that interacted with rocks of the Precambrian craton to the east of the study area, or with such material transported and reworked in the studied sedimentary succession.

Published
2005

31. Late Archean and early Proterozoic crustal evolution of the Mount Isa block, northwest Queensland, Australia

Author

McDonald, Graeme D., Collerson, Kenneth D., and Kinny, Peter D.

Subjects
Queensland -- Natural history, Earth -- Crust, Geology, Stratigraphic -- Archaean, Earth sciences
Abstract

Recognition of Late Archean and Early Proterozoic tonalite-trondhjemite-granodiorite crust in the Mount Isa block, northwest Queensland, Australia, has important implications for Proterozoic crustal evolutionary models in the North Australian craton. Protoliths of the Black Angel Gneiss Complex formed 2.42-2.50 Ga (Black Angel Gneisses) and 1.97-2.00 Ga (Pothole Creek Gneisses). Both groups have Nd model ages of 2.42 to 2.58 Ga. Supracrustal components within the gneiss complex have Nd model ages of 2.75 to 2.83 Ga. These data, and inherited components in zircons, indicate the presence of even older Archean crust. Crystallization of 1.84-1.87 Ga rims record a thermal event during a subsequent period of granitic (Kalkadoon-Leichhardt) magmatism. Both the Black Angel Gneiss Complex and Kalkadoon-Leichhardt magmatic suite have strong arc geochemical signatures and have components that are compositionally similar to Archean tonalite-trondhjemite-granodiorite lithologies. A seismically defined, crustal-scale, west-dipping feature in the Mount Isa block may be a Proterozoic cryptic suture. Subduction-zone magmatism may be related to this feature. Late Archean and Early Proterozoic crust formation in this segment of the North Australian craton was subduction driven, involving assembly of microcontinental terranes similar to other Early Proterozoic belts. This observation is significant, because paleomagnetic data indicate that the North Australian craton and Laurentia were juxtaposed during Early to Middle Proterozoic time.

Published
1997

39. Tungsten isotope evidence from [similar]3.8-Gyr metamorphosed sediments for early meteorite bombardment of the Earth

Author

Schoenberg, Ronny, Kamber, Balz S., Collerson, Kenneth D., and Moorbath, Stephen

Subjects
Environmental issues, Science and technology, Zoology and wildlife conservation
Abstract

Author(s): Ronny Schoenberg (corresponding author) [1]; Balz S. Kamber [1]; Kenneth D. Collerson [1]; Stephen Moorbath [2] The 'Late Heavy Bombardment' was a phase in the impact history of the [...]

Published
2002
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43. Thermal ionization mass spectrometry U-series dating of a hominid site near Nanjing, China

Author

Zhao, Jian-xin, Hu, Kai, Collerson, Kenneth D., and Xu, Han-kui

Subjects
Teeth, Fossil -- Physiological aspects, Pithecanthropus erectus -- Physiological aspects, Prehistoric peoples -- Physiological aspects, Earth sciences
Abstract

Mass spectrometric U-series dating of speleothems from Tangshan Cave, combined with ecological and paleoclimatic evidence, indicates that Nanjing Man, a typical Homo erectus morphologically correlated with Peking Man at Zhoukoudian, should be at least 580 k.y. old, or more likely lived during the glacial oxygen isotope stage 16 (~620 ka). Such an age estimate, which is ~270 ka older than previous electron spin resonance and alpha-counting U-series dates, has significant implications for the evolution of Asian H. erectus. Dentine and enamel samples from the coexisting fossil layer yield significantly younger apparent ages, that of the enamel sample being only less than one-fourth of the minimum age of Nanjing Man. This suggests that U uptake history is far more complex than existing models can handle. As a result, great care must be taken in the interpretation of electron spin resonance and U-series dates of fossil teeth. Keywords: H. erectus, U-series, TIMS, speleothem, tooth.

Published
2001

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