THE UNEXPECTED 1870s/1880s RESPONSE TO THE MID-CENOMANIAN EVENT: AN INVESTIGATION IN THE IONA-1 CORE
The emplacement of either the Caribbean Large Igneous Province (CLIP) or High Arctic Large Igneous Province (HALIP) is implicated in the triggering of the CenomanianTuronian Ocean Anoxic Event 2 (OAE-2; ca 94 - 95 Ma). Evidence for a similar initiation mechanism for the Mid-Cenomanian Event (MCE; ca...
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ftunivhouston:oai:uh-ir.tdl.org:10657/4267 2023-05-15T15:08:50+02:00 THE UNEXPECTED 1870s/1880s RESPONSE TO THE MID-CENOMANIAN EVENT: AN INVESTIGATION IN THE IONA-1 CORE Lauckner, Liam Brandon, Alan D. Fu, Qi Khan, Shuhab D. 2018-12 application/pdf https://hdl.handle.net/10657/4267 en eng Senior Honors Theses https://hdl.handle.net/10657/4267 The author of this work is the copyright owner. UH Libraries and the Texas Digital Library have their permission to store and provide access to this work. Further transmission, reproduction, or presentation of this work is prohibited except with permission of the author(s). Honors Thesis Text 2018 ftunivhouston 2023-03-11T23:07:44Z The emplacement of either the Caribbean Large Igneous Province (CLIP) or High Arctic Large Igneous Province (HALIP) is implicated in the triggering of the CenomanianTuronian Ocean Anoxic Event 2 (OAE-2; ca 94 - 95 Ma). Evidence for a similar initiation mechanism for the Mid-Cenomanian Event (MCE; ca 96.5 Ma), a precursor to OAE-2 during which comparable environmental conditions persisted, is contradictory or absent. In this study, a reconstruction of mid-Cenomanian seawater 187Os/188Os from the Iona-1 core, SW Texas, the first for the Cretaceous Western Interior Seaway, tests the role of LIP activity in triggering the MCE. The absence of a prolonged unradiogenic Os-isotope excursion (low 187Os/188Os) during the MCE interval argues against CLIP involvement in the event's initiation. Instead, the coincidence of a muted unradiogenic Os-isotope excursion and elevated Hg concentrations with published 40Ar39Ar ages of 96.4 Ma of basalts from Ellesmere Island, Canada, suggests HALIP-related volcanic activity may have precipitated the MCE. In addition, the correlation of a pronounced radiogenic Os-isotope excursion (high 187Os/188Os) between Iona-1 and previous measurements from the English Chalk, Eastbourne, England, provides evidence for elevated pCO2, an accelerated global hydrologic cycle and increased continental weathering rates -- conditions known to exist during OAE-2 but previously only postulated for the MCE. Earth and Atmospheric Sciences, Department of Honors College Text Arctic Ellesmere Island University of Houston Institutional Repository (UHIR) Arctic Canada Ellesmere Island |
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Open Polar |
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University of Houston Institutional Repository (UHIR) |
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ftunivhouston |
language |
English |
description |
The emplacement of either the Caribbean Large Igneous Province (CLIP) or High Arctic Large Igneous Province (HALIP) is implicated in the triggering of the CenomanianTuronian Ocean Anoxic Event 2 (OAE-2; ca 94 - 95 Ma). Evidence for a similar initiation mechanism for the Mid-Cenomanian Event (MCE; ca 96.5 Ma), a precursor to OAE-2 during which comparable environmental conditions persisted, is contradictory or absent. In this study, a reconstruction of mid-Cenomanian seawater 187Os/188Os from the Iona-1 core, SW Texas, the first for the Cretaceous Western Interior Seaway, tests the role of LIP activity in triggering the MCE. The absence of a prolonged unradiogenic Os-isotope excursion (low 187Os/188Os) during the MCE interval argues against CLIP involvement in the event's initiation. Instead, the coincidence of a muted unradiogenic Os-isotope excursion and elevated Hg concentrations with published 40Ar39Ar ages of 96.4 Ma of basalts from Ellesmere Island, Canada, suggests HALIP-related volcanic activity may have precipitated the MCE. In addition, the correlation of a pronounced radiogenic Os-isotope excursion (high 187Os/188Os) between Iona-1 and previous measurements from the English Chalk, Eastbourne, England, provides evidence for elevated pCO2, an accelerated global hydrologic cycle and increased continental weathering rates -- conditions known to exist during OAE-2 but previously only postulated for the MCE. Earth and Atmospheric Sciences, Department of Honors College |
author2 |
Brandon, Alan D. Fu, Qi Khan, Shuhab D. |
format |
Text |
author |
Lauckner, Liam |
spellingShingle |
Lauckner, Liam THE UNEXPECTED 1870s/1880s RESPONSE TO THE MID-CENOMANIAN EVENT: AN INVESTIGATION IN THE IONA-1 CORE |
author_facet |
Lauckner, Liam |
author_sort |
Lauckner, Liam |
title |
THE UNEXPECTED 1870s/1880s RESPONSE TO THE MID-CENOMANIAN EVENT: AN INVESTIGATION IN THE IONA-1 CORE |
title_short |
THE UNEXPECTED 1870s/1880s RESPONSE TO THE MID-CENOMANIAN EVENT: AN INVESTIGATION IN THE IONA-1 CORE |
title_full |
THE UNEXPECTED 1870s/1880s RESPONSE TO THE MID-CENOMANIAN EVENT: AN INVESTIGATION IN THE IONA-1 CORE |
title_fullStr |
THE UNEXPECTED 1870s/1880s RESPONSE TO THE MID-CENOMANIAN EVENT: AN INVESTIGATION IN THE IONA-1 CORE |
title_full_unstemmed |
THE UNEXPECTED 1870s/1880s RESPONSE TO THE MID-CENOMANIAN EVENT: AN INVESTIGATION IN THE IONA-1 CORE |
title_sort |
unexpected 1870s/1880s response to the mid-cenomanian event: an investigation in the iona-1 core |
publishDate |
2018 |
url |
https://hdl.handle.net/10657/4267 |
geographic |
Arctic Canada Ellesmere Island |
geographic_facet |
Arctic Canada Ellesmere Island |
genre |
Arctic Ellesmere Island |
genre_facet |
Arctic Ellesmere Island |
op_relation |
Senior Honors Theses https://hdl.handle.net/10657/4267 |
op_rights |
The author of this work is the copyright owner. UH Libraries and the Texas Digital Library have their permission to store and provide access to this work. Further transmission, reproduction, or presentation of this work is prohibited except with permission of the author(s). |
_version_ |
1766340120703664128 |