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19. Mercury contents and isotope ratios from diverse depositional environments across the Triassic–Jurassic Boundary: Towards a more robust mercury proxy for large igneous province magmatism

Author

Yager, Joyce A., West, A. Joshua, Thibodeau, Alyson M., Corsetti, Frank A., Rigo, Manuel, Berelson, William M., Bottjer, David J., Greene, Sarah E., Ibarra, Yadira, Jadoul, Flavio, Ritterbush, Kathleen A., Rollins, Nick, Rosas, Silvia, Di Stefano, Pietro, Sulca, Debbie, Todaro, Simona, Wynn, Peter, Zimmermann, Laura, and Bergquist, Bridget A.

Published
2021
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32. Establishing consensus on the best practice guidelines for the use of bracing in adolescent idiopathic scoliosis

Author

Roye, Benjamin D., Simhon, Matthew E., Matsumoto, Hiroko, Bakarania, Prachi, Berdishevsky, Hagit, Dolan, Lori A., Grimes, Kelly, Grivas, Theodoros B., Hresko, Michael T., Karol, Lori A., Lonner, Baron S., Mendelow, Michael, Negrini, Stefano, Newton, Peter O., Parent, Eric C., Rigo, Manuel, Strikeleather, Luke, Tunney, John, Weinstein, Stuart L., Wood, Grant, and Vitale, Michael G.

Published
2020
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36. Weathering trends in the Norian through geochemical and rock magnetic analyses from the Pignola–Abriola section (Lagonegro Basin, Italy).

Author

Maron, Matteo, Onoue, Tetsuji, Satolli, Sara, Soda, Katsuhito, Sato, Honami, Muttoni, Giovanni, and Rigo, Manuel

Subjects
ROCK analysis, PANGAEA (Supercontinent), MULTIVARIATE analysis, MAGNETIC susceptibility, IRON oxidation, ROCK properties, OROGENIC belts
Abstract

We investigated the geochemical and rock magnetic properties of the magnetostratigraphically calibrated Pignola–Abriola section (Italy) in order to understand the climatic perturbations that characterize the late Norian–early Rhaetian interval (Late Triassic). We performed experiments on anhysteretic and isothermal remanence (ARM and IRM) and on magnetic susceptibility (χ) to obtain the rock magnetic parameters necessary for our paleoclimatic investigation. An episode of increase in the relative quantity of hematite, suggesting the enhanced subaerial oxidation of iron minerals, was identified in the Norian from ∼ 217 Ma in the Alaunian up to ∼ 211 Ma in the early Sevatian, followed by a decline up to 207–206 Ma at the end of the Norian (late Sevatian). The results of geochemical and multivariate statistical analyses support a long-term increase and reduction in rock weathering, confirming and extending previous 87 Sr / 86 Sr data from the Pizzo Mondello section (Italy). Possible causes of these long-term weathering trends are the multiphase uplifting of the Cimmerian orogen, occurring at mid-northern latitudes along the southern margin of Asia in the Late Triassic, and/or the northward motion of Pangea across the equatorial humid belt. Rapid excursions in oxidized iron minerals have also been observed across the Norian–Rhaetian boundary, the origin of which still has to be determined. [ABSTRACT FROM AUTHOR]

Published
2024
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45. Establishing consensus on the best practice guidelines for the use of bracing in adolescent idiopathic scoliosis

Author

Roye, Benjamin D., Simhon, Matthew E., Matsumoto, Hiroko, Bakarania, Prachi, Berdishevsky, Hagit, Dolan, Lori A., Grimes, Kelly, Grivas, Theodoros B., Hresko, Michael T., Karol, Lori A., Lonner, Baron S., Mendelow, Michael, Negrini, Stefano, Newton, Peter O., Parent, Eric C., Rigo, Manuel, Strikeleather, Luke, Tunney, John, Weinstein, Stuart L., Wood, Grant, and Vitale, Michael G.

Abstract

Study design: Survey. Objectives: Bracing is the mainstay of conservative treatment in Adolescent Idiopathic Scoliosis (AIS). The purpose of this study was to establish best practice guidelines (BPG) among a multidisciplinary group of international bracing experts including surgeons, physiatrists, physical therapists, and orthotists utilizing formal consensus building techniques. Summary of background data: Currently, there is significant variability in the practice of brace treatment for AIS and, therefore, there is a strong need to develop BPG for bracing in AIS. Methods: We utilized the Delphi process and the nominal group technique to establish consensus among a multidisciplinary group of bracing experts. Our previous work identified areas of variability in brace treatment that we targeted for consensus. Following a review of the literature, three iterative surveys were administered. Topics included bracing goals, indications for starting and discontinuing bracing, brace types, brace prescription, radiographs, physical activities, and physiotherapeutic scoliosis-specific exercises. A face-to-face meeting was then conducted that allowed participants to vote for or against inclusion of each item. Agreement of 80% throughout the surveys and face-to-face meeting was considered consensus. Items that did not reach consensus were discussed and revised and repeat voting for consensus was performed. Results: Of the 38 experts invited to participate, we received responses from 32, 35, and 34 for each survey, respectively. 11 surgeons, 4 physiatrists, 8 physical therapists, 3 orthotists, and 1 research scientist participated in the final face-to-face meeting. Experts reached consensus on 67 items across 10 domains of bracing which were consolidated into the final best practice recommendations. Conclusions: We believe that adherence to these BPG will lead to fewer sub-optimal outcomes in patients with AIS by reducing the variability in AIS bracing practices, and provide a framework future research. Level of evidence: Level IV.

Published
2024
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46. Growth allometry and dental topography in Upper Triassic conodonts support trophic differentiation and molar-like element function.

Author

Kelz, Valentin, Guenser, Pauline, Rigo, Manuel, and Jarochowska, Emilia

Abstract

Conodont elements have high rates of morphological evolution, but the drivers of this disparity are debated. Positive allometric relationships between dimensions of food-processing surfaces and entire P1 elements have been used to argue that these elements performed mechanical digestion. If involved in food processing, the surface of the element should grow at a rate proportional to the increase in energy requirements of the animal. This inference of function relies on the assumption that the energy requirements of the animal grew faster (≅ mass0.75) than the tooth area (≅ mass0.67). We reevaluate this assumption based on metabolic rates across animals and calculate the allometry in platform-bearing P1 elements of Late Triassic co-occurring taxa, Metapolygnathus communisti and Epigondolella rigoi , using 3D models of ontogenetic series. Positive allometry is found in platform and element dimensions in both species, supporting a grasping-tooth hypothesis, based on the assumption that metabolic rate in conodonts scaled with body mass similarly to that in fish and ectotherms. We also calculate the curvature of the P1 platform surface using the Dirichlet normal energy (DNE) as a proxy for diet. DNE values increase with body mass, supporting the assumption that conodont metabolic rates increased faster than mass0.67. We finally find that adults in both taxa differ in their food bases, which supports trophic diversification as an important driver of the remarkable disparity of conodont elements. [ABSTRACT FROM AUTHOR]

Published
2023
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50. Weathering trends in the Norian through geochemical and rock magnetic analyses from the Pignola-Abriola Section (Lagonegro Basin, Italy).

Author

Maron, Matteo, Tetsuji Onoue, Sara Satolli, Katsuhito Soda, Honami Sato, Muttoni, Giovanni, and Rigo, Manuel

Abstract

We investigated the geochemical and rock magnetic properties of the magnetostratigraphically-calibrated Pignola-Abriola section (Italy) in order to understand the climatic perturbations that characterize the late Norian-early Rhaetian interval (Late Triassic). We performed experiments on anhysteretic and isothermal remanence (ARM, IRM), and on magnetic susceptibility (?), to obtain the rock magnetic parameters necessary for our paleoclimatic investigation. An episode of increase in relative quantity of hematite, suggesting enhanced subaerial oxidation of iron minerals, was identified in the Norian from ~217 Ma in the Alaunian up to ~211 Ma in the early Sevatian, followed by a decline up to 207-206 Ma at the end of the Norian (late Sevatian). The results of geochemical and multivariate statistical analyses support a long-term increase and reduction in rock weathering, confirming and extending previous 87Sr/86Sr data from the Pizzo Mondello section (Italy). Possible causes of these long-term weathering trends are the multiphase uplifting of the Cimmerian orogen, occurring at mid northern latitudes along the southern margin of Asia in the Late Triassic, and/or the northward motion of Pangea across the equatorial humid belt. Rapid excursions in oxidized iron minerals have also been observed across the Norian/Rhaetian boundary, the origin of which has still to be determined. [ABSTRACT FROM AUTHOR]

Published
2023
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