THE UNEXPECTED 1870s/1880s RESPONSE TO THE MID-CENOMANIAN EVENT: AN INVESTIGATION IN THE IONA-1 CORE

dc.contributorBrandon, Alan D.
dc.contributorFu, Qi
dc.contributorKhan, Shuhab D.
dc.contributor.authorLauckner, Liam
dc.date.accessioned2019-07-29T19:04:34Z
dc.date.available2019-07-29T19:04:34Z
dc.date.issued2018-12
dc.description.abstractThe 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.
dc.description.departmentEarth and Atmospheric Sciences, Department of
dc.description.departmentHonors College
dc.identifier.urihttps://hdl.handle.net/10657/4267
dc.language.isoen
dc.relation.ispartofSenior Honors Theses
dc.rightsThe 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).
dc.titleTHE UNEXPECTED 1870s/1880s RESPONSE TO THE MID-CENOMANIAN EVENT: AN INVESTIGATION IN THE IONA-1 CORE
dc.typeHonors Thesis
dc.type.dcmiText
thesis.degree.collegeCollege of Natural Sciences and Mathematics
thesis.degree.levelBachelors
thesis.degree.nameBachelor of Science

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