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Stable Carbon and Oxygen Isotopes of Early Silurian Pentameride Brachiopods from Quebec, Ontario, and Nunavut, and Paleoenvironmental Implications.
紀錄類型:
書目-電子資源 : Monograph/item
正題名/作者:
Stable Carbon and Oxygen Isotopes of Early Silurian Pentameride Brachiopods from Quebec, Ontario, and Nunavut, and Paleoenvironmental Implications./
作者:
Siewnarine, Jordan N.
面頁冊數:
1 online resource (172 pages)
附註:
Source: Masters Abstracts International, Volume: 84-04.
Contained By:
Masters Abstracts International84-04.
標題:
Oceans. -
電子資源:
http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=29404718click for full text (PQDT)
ISBN:
9798352649121
Stable Carbon and Oxygen Isotopes of Early Silurian Pentameride Brachiopods from Quebec, Ontario, and Nunavut, and Paleoenvironmental Implications.
Siewnarine, Jordan N.
Stable Carbon and Oxygen Isotopes of Early Silurian Pentameride Brachiopods from Quebec, Ontario, and Nunavut, and Paleoenvironmental Implications.
- 1 online resource (172 pages)
Source: Masters Abstracts International, Volume: 84-04.
Thesis (M.Sc.)--The University of Western Ontario (Canada), 2022.
Includes bibliographical references
Analysis of low-Mg calcite brachiopod shells for δ 18O and δ 13C signatures provide quantitative independent geochemical data for paleoenvironmental interpretations. We analyzed 59 brachiopod shells from lower Silurian carbonate rocks of Anticosti Island, the Hudson Bay Lowlands and Niagara regions for spaciotemporal isotopic trends for the early Silurian. Screening tests using scanning electron microscopy, cathodoluminescence and trace element analysis demonstrate exceptional preservation, suggesting retention of primary isotopic values. δ 13C and δ 18O values of shells range from 0.2‰ to 2.9‰ and -6.9‰ to -4.3‰ (VPDB), respectively. Temporally, increases in δ 13C and δ 18O values occurred in response to the Late Aeronian glaciation. Paleogeographically, δ 18O values were not significantly different between regions while δ 13C was tied to open ocean vs epeiric sea settings. We argue for ocean δ 18O value of ~ -1.5‰ (VSMOW), producing paleotemperatures of 30 °C to 36 ⁰C, consistent with the proposition that ocean δ 18O has remained constant over geologic time.
Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2023
Mode of access: World Wide Web
ISBN: 9798352649121Subjects--Topical Terms:
561029
Oceans.
Index Terms--Genre/Form:
542853
Electronic books.
Stable Carbon and Oxygen Isotopes of Early Silurian Pentameride Brachiopods from Quebec, Ontario, and Nunavut, and Paleoenvironmental Implications.
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Analysis of low-Mg calcite brachiopod shells for δ 18O and δ 13C signatures provide quantitative independent geochemical data for paleoenvironmental interpretations. We analyzed 59 brachiopod shells from lower Silurian carbonate rocks of Anticosti Island, the Hudson Bay Lowlands and Niagara regions for spaciotemporal isotopic trends for the early Silurian. Screening tests using scanning electron microscopy, cathodoluminescence and trace element analysis demonstrate exceptional preservation, suggesting retention of primary isotopic values. δ 13C and δ 18O values of shells range from 0.2‰ to 2.9‰ and -6.9‰ to -4.3‰ (VPDB), respectively. Temporally, increases in δ 13C and δ 18O values occurred in response to the Late Aeronian glaciation. Paleogeographically, δ 18O values were not significantly different between regions while δ 13C was tied to open ocean vs epeiric sea settings. We argue for ocean δ 18O value of ~ -1.5‰ (VSMOW), producing paleotemperatures of 30 °C to 36 ⁰C, consistent with the proposition that ocean δ 18O has remained constant over geologic time.
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