Zobrazeno 1 - 10 of 118 pro vyhledávání: '"Sandra L. Kamo"'
1
Akademický článek
New age constraints on the Lower Jurassic Pliensbachian–Toarcian Boundary at Chacay Melehue (Neuquén Basin, Argentina)
Autor: Aisha H. Al-Suwaidi, Micha Ruhl, Hugh C. Jenkyns, Susana E. Damborenea, Miguel O. Manceñido, Daniel J. Condon, Gladys N. Angelozzi, Sandra L. Kamo, Marisa Storm, Alberto C. Riccardi, Stephen P. Hesselbo
Publikováno v: Scientific Reports, Vol 12, Iss 1, Pp 1-10 (2022)
Abstract The Pliensbachian–Toarcian boundary interval is characterized by a ~ 3‰ negative carbon-isotope excursion (CIE) in organic and inorganic marine and terrestrial archives from sections in Europe, such as Peniche (Portugal) and Hawsker Bott
Externí odkaz: https://doaj.org/article/f37972d462174411b61a67921f2510bf
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2
Akademický článek
Old subcontinental mantle zircon below Oahu
Autor: John D. Greenough, Sandra L. Kamo, Donald W. Davis, Kyle Larson, Zhen Zhang, Daniel Layton-Matthews, Joan De Vera, Bridget A. Bergquist
Publikováno v: Communications Earth & Environment, Vol 2, Iss 1, Pp 1-9 (2021)
Oceanic mantle-derived zircon grains recovered from pyroxenite xenoliths in Hawaii have 14-million-year-old rims, Cretaceous cores and Proterozoic lutetium-hafnium model-ages, according to mass spectrometry and electron microprobe analyses.
Externí odkaz: https://doaj.org/article/f69c9aa623f4466b9d4209532e32b8ee
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3
Akademický článek
The base of the Lystrosaurus Assemblage Zone, Karoo Basin, predates the end-Permian marine extinction
Autor: Robert A. Gastaldo, Sandra L. Kamo, Johann Neveling, John W. Geissman, Cindy V. Looy, Anna M. Martini
Publikováno v: Nature Communications, Vol 11, Iss 1, Pp 1-8 (2020)
The end-Permian is associated with major changes in both marine and terrestrial biodiversity. Here, Gastaldo et al. present high resolution dating of the Lystrosaurus Assemblage Zone in the Karoo Basin, South Africa, demonstrating that the marine cri
Externí odkaz: https://doaj.org/article/25e037b9b7eb47619d851c976fc1d06a
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4
Akademický článek
U–Pb geochronology documents out-of-sequence emplacement of ultramafic layers in the Bushveld Igneous Complex of South Africa
Autor: James E. Mungall, Sandra L. Kamo, Stewart McQuade
Publikováno v: Nature Communications, Vol 7, Iss 1, Pp 1-13 (2016)
Large igneous intrusions layering is thought to represent an upward-aggrading crystal pile. However, Mungallet al.show that the Rustenburg Layered Suite of the Bushveld Complex, South Africa was created by the injection of a series of thin sheet-like
Externí odkaz: https://doaj.org/article/1083099676844f30a72183e876a1354f
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5
Natural Allanite Reference Materials for In Situ U‐Th‐Pb and Sm‐Nd Isotopic Measurements by LA‐(MC)‐ICP‐MS
Autor: Ming Yang, Yue‐Heng Yang, Sandra L. Kamo, Rolf L. Romer, Nick M.W. Roberts, Hao Wang, Lie‐Wen Xie, Chao Huang, Jin‐Hui Yang, Fu‐Yuan Wu
Publikováno v: Geostandards and Geoanalytical Research
Allanite is a common accessory mineral that generally incorporates considerable amounts of Th, U and light rare Earth elements in its structure, making it a useful mineral for in situ U-Th-Pb geochronology and Sm-Nd isotope measurements. Here, we pre
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::44090db0a94f2d9f5e57087b7bd310d1
https://doi.org/10.1111/ggr.12417
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6
A tale of two Tweefonteins: What physical correlation, geochronology, magnetic polarity stratigraphy, and palynology reveal about the end-Permian terrestrial extinction paradigm in South Africa
Autor: John W. Geissman, Robert A. Gastaldo, Johann Neveling, Sandra L. Kamo, Cindy V. Looy
Publikováno v: GSA Bulletin. 134:691-721
The contact between the Daptocephalus to Lystrosaurus declivis (previously Lystrosaurus) Assemblage Zones (AZs) described from continental deposits of the Karoo Basin was commonly interpreted to represent an extinction crisis associated with the end-
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::b522c5f8351454e2dd3e5283df89166e
https://doi.org/10.1130/b35830.1
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7
High-precision U–Pb CA–ID–TIMS dating and chronostratigraphy of the dinosaur-rich Horseshoe Canyon Formation (Upper Cretaceous, Campanian–Maastrichtian), Red Deer River valley, Alberta, Canada
Autor: Sandra L. Kamo, David A. Eberth
Publikováno v: Canadian Journal of Earth Sciences. 57:1220-1237
The non-marine Horseshoe Canyon Formation (HCFm, southern Alberta) yields taxonomically diverse, late Campanian to middle Maastrichtian dinosaur assemblages that play a central role in documenting dinosaur evolution, paleoecology, and paleobiogeograp
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::02440ba045eaf97b624ae5f2747fa45c
https://doi.org/10.1139/cjes-2019-0019
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8
Highly accurate dating of micrometre-scale baddeleyite domains through combined focused ion beam extraction and U–Pb thermal ionization mass spectrometry (FIB-TIMS)
Autor: Desmond E. Moser, Kimberly T. Tait, L. F. White, James Darling, Sandra L. Kamo
Publikováno v: Geochronology, Vol 2, Pp 177-186 (2020)
White, L F, Tait, K, Kamo, S L, Moser, D E & Darling, J 2020, ' Highly accurate dating of micrometre-scale baddeleyite domains through combined focused ion beam extraction and U–Pb thermal ionization mass spectrometry (FIB-TIMS) ', Geochronology, vol. 2, pp. 177-186 . https://doi.org/10.5194/gchron-2-177-2020
Baddeleyite is a powerful chronometer of mafic magmatic and meteorite impact processes. Precise and accurate U–Pb ages can be determined from single grains by isotope dilution thermal ionization mass spectrometry (ID-TIMS), but this requires disagg
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e3ab0a6f69aa61f2f1e1d43f7cb67e01
https://doi.org/10.5194/gchron-2-177-2020
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9
The base of the Lystrosaurus Assemblage Zone, Karoo Basin, predates the end-Permian marine extinction
Autor: Johann Neveling, Cindy V. Looy, John W. Geissman, Robert A. Gastaldo, Anna M. Martini, Sandra L. Kamo
Publikováno v: Nature Communications, Vol 11, Iss 1, Pp 1-8 (2020)
Nature Communications
The current model for the end-Permian terrestrial ecosystem crisis holds that systematic loss exhibited by an abrupt turnover from the Daptocephalus to the Lystrosaurus Assemblage Zone (AZ; Karoo Basin, South Africa) is time equivalent with the marin
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d7d225d4bc52e80240bc62b547d8b4d8
https://doaj.org/article/25e037b9b7eb47619d851c976fc1d06a
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