New age constraints support a K/Pg boundary interval on Vega Island, Antarctica: Implications for latest Cretaceous vertebrates and paleoenvironments
A second K/Pg boundary interval in the northern sector of the Antarctic Peninsula on Vega Island has been proposed, yet current temporal resolution of these strata prohibits direct testing of this hypothesis. To not only test for the existence of a K/Pg boundary on Vega Island but also provide incre...
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ftpcom:oai:digitalcommons.pcom.edu:scholarly_papers-3317 2023-09-05T13:13:15+02:00 New age constraints support a K/Pg boundary interval on Vega Island, Antarctica: Implications for latest Cretaceous vertebrates and paleoenvironments Roberts, Eric M O'Connor, Patrick M Clarke, Julia A Slotznick, Sarah P Placzek, Christa J Tobin, Thomas S Hannaford, Carey Orr, Theresa Jinnah, Zubair A Claeson, Kerin M. Salisbury, Steven Kirschvink, Joseph L 2023-01-01T08:00:00Z https://digitalcommons.pcom.edu/scholarly_papers/2189 unknown https://digitalcommons.pcom.edu/scholarly_papers/2189 PCOM Scholarly Papers Geochronology Isotopes Molluscs Zircon Paleobiology text 2023 ftpcom 2023-08-14T06:12:17Z A second K/Pg boundary interval in the northern sector of the Antarctic Peninsula on Vega Island has been proposed, yet current temporal resolution of these strata prohibits direct testing of this hypothesis. To not only test for the existence of a K/Pg boundary on Vega Island but also provide increased age resolution for the associated vertebrate fauna (e.g., marine reptiles, nonavian dinosaurs, and avian dinosaurs), the Vega Island succession was intensively resampled. Stratigraphic investigation of the Cape Lamb Member of the Snow Hill Island Formation, and in particular, the overlying Sandwich Bluff Member of the López de Bertodano Formation, was conducted using biostratigraphy, strontium isotope stratigraphy, magnetostratigraphy, and detrital zircon geochronology. These data indicate a Late Campanian–early Maastrichtian age for the Cape Lamb Member and present three possible correlations to the global polarity time scale (GPTS) for the overlying Sandwich Bluff Member. The most plausible correlation, which is consistent with biostratigraphy, detrital zircon geochronology, sequence stratigraphy, and all but one of the Sr-isotope ages, correlates the base of the section to C31N and the top of the section with C29N, which indicates that the K/Pg boundary passes through the top of the unit. A second, less plausible option conflicts with the biostratigraphy and depends on a series of poorly defined magnetic reversals in the upper part of the stratigraphy that also correlates the section between C31N and C29R and again indicates an inclusive K/Pg boundary interval. The least likely correlation, which depends on favoring only a single Srisotope age at the top of the section over biostratigraphy, correlates the section between C31N and C30N and is inconsistent with an included K/Pg boundary interval. Although our preferred correlation is well supported, we failed to identify an Ir-anomaly, spherules/ impact ejecta, or other direct evidence typically used to define the precise position of a K/Pg boundary on Vega ... Text Antarc* Antarctic Antarctic Peninsula Antarctica Snow Hill Island Vega Island Philadelphia College of Osteopathic Medicine: DigitalCommons@PCOM Antarctic Antarctic Peninsula Cape Lamb ENVELOPE(-57.621,-57.621,-63.909,-63.909) Hill Island ENVELOPE(76.070,76.070,-69.395,-69.395) Sandwich Bluff ENVELOPE(-57.569,-57.569,-63.832,-63.832) Snow Hill ENVELOPE(-57.183,-57.183,-64.466,-64.466) Snow Hill Island ENVELOPE(-57.183,-57.183,-64.466,-64.466) The Antarctic Vega Island ENVELOPE(-57.500,-57.500,-63.833,-63.833) |
institution |
Open Polar |
collection |
Philadelphia College of Osteopathic Medicine: DigitalCommons@PCOM |
op_collection_id |
ftpcom |
language |
unknown |
topic |
Geochronology Isotopes Molluscs Zircon Paleobiology |
spellingShingle |
Geochronology Isotopes Molluscs Zircon Paleobiology Roberts, Eric M O'Connor, Patrick M Clarke, Julia A Slotznick, Sarah P Placzek, Christa J Tobin, Thomas S Hannaford, Carey Orr, Theresa Jinnah, Zubair A Claeson, Kerin M. Salisbury, Steven Kirschvink, Joseph L New age constraints support a K/Pg boundary interval on Vega Island, Antarctica: Implications for latest Cretaceous vertebrates and paleoenvironments |
topic_facet |
Geochronology Isotopes Molluscs Zircon Paleobiology |
description |
A second K/Pg boundary interval in the northern sector of the Antarctic Peninsula on Vega Island has been proposed, yet current temporal resolution of these strata prohibits direct testing of this hypothesis. To not only test for the existence of a K/Pg boundary on Vega Island but also provide increased age resolution for the associated vertebrate fauna (e.g., marine reptiles, nonavian dinosaurs, and avian dinosaurs), the Vega Island succession was intensively resampled. Stratigraphic investigation of the Cape Lamb Member of the Snow Hill Island Formation, and in particular, the overlying Sandwich Bluff Member of the López de Bertodano Formation, was conducted using biostratigraphy, strontium isotope stratigraphy, magnetostratigraphy, and detrital zircon geochronology. These data indicate a Late Campanian–early Maastrichtian age for the Cape Lamb Member and present three possible correlations to the global polarity time scale (GPTS) for the overlying Sandwich Bluff Member. The most plausible correlation, which is consistent with biostratigraphy, detrital zircon geochronology, sequence stratigraphy, and all but one of the Sr-isotope ages, correlates the base of the section to C31N and the top of the section with C29N, which indicates that the K/Pg boundary passes through the top of the unit. A second, less plausible option conflicts with the biostratigraphy and depends on a series of poorly defined magnetic reversals in the upper part of the stratigraphy that also correlates the section between C31N and C29R and again indicates an inclusive K/Pg boundary interval. The least likely correlation, which depends on favoring only a single Srisotope age at the top of the section over biostratigraphy, correlates the section between C31N and C30N and is inconsistent with an included K/Pg boundary interval. Although our preferred correlation is well supported, we failed to identify an Ir-anomaly, spherules/ impact ejecta, or other direct evidence typically used to define the precise position of a K/Pg boundary on Vega ... |
format |
Text |
author |
Roberts, Eric M O'Connor, Patrick M Clarke, Julia A Slotznick, Sarah P Placzek, Christa J Tobin, Thomas S Hannaford, Carey Orr, Theresa Jinnah, Zubair A Claeson, Kerin M. Salisbury, Steven Kirschvink, Joseph L |
author_facet |
Roberts, Eric M O'Connor, Patrick M Clarke, Julia A Slotznick, Sarah P Placzek, Christa J Tobin, Thomas S Hannaford, Carey Orr, Theresa Jinnah, Zubair A Claeson, Kerin M. Salisbury, Steven Kirschvink, Joseph L |
author_sort |
Roberts, Eric M |
title |
New age constraints support a K/Pg boundary interval on Vega Island, Antarctica: Implications for latest Cretaceous vertebrates and paleoenvironments |
title_short |
New age constraints support a K/Pg boundary interval on Vega Island, Antarctica: Implications for latest Cretaceous vertebrates and paleoenvironments |
title_full |
New age constraints support a K/Pg boundary interval on Vega Island, Antarctica: Implications for latest Cretaceous vertebrates and paleoenvironments |
title_fullStr |
New age constraints support a K/Pg boundary interval on Vega Island, Antarctica: Implications for latest Cretaceous vertebrates and paleoenvironments |
title_full_unstemmed |
New age constraints support a K/Pg boundary interval on Vega Island, Antarctica: Implications for latest Cretaceous vertebrates and paleoenvironments |
title_sort |
new age constraints support a k/pg boundary interval on vega island, antarctica: implications for latest cretaceous vertebrates and paleoenvironments |
publishDate |
2023 |
url |
https://digitalcommons.pcom.edu/scholarly_papers/2189 |
long_lat |
ENVELOPE(-57.621,-57.621,-63.909,-63.909) ENVELOPE(76.070,76.070,-69.395,-69.395) ENVELOPE(-57.569,-57.569,-63.832,-63.832) ENVELOPE(-57.183,-57.183,-64.466,-64.466) ENVELOPE(-57.183,-57.183,-64.466,-64.466) ENVELOPE(-57.500,-57.500,-63.833,-63.833) |
geographic |
Antarctic Antarctic Peninsula Cape Lamb Hill Island Sandwich Bluff Snow Hill Snow Hill Island The Antarctic Vega Island |
geographic_facet |
Antarctic Antarctic Peninsula Cape Lamb Hill Island Sandwich Bluff Snow Hill Snow Hill Island The Antarctic Vega Island |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica Snow Hill Island Vega Island |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica Snow Hill Island Vega Island |
op_source |
PCOM Scholarly Papers |
op_relation |
https://digitalcommons.pcom.edu/scholarly_papers/2189 |
_version_ |
1776204305592745984 |