Mason Archival Repository Service

Milankovitch Cyclicity and Global Time Constraint of Cretaceous Black Shales and Oceanic Anoxic Event 2 at the Demerara Rise, Western Equatorial Atlantic Ocean

Show simple item record

dc.contributor.advisor Hinnov, Linda
dc.contributor.author Karoly, Sean
dc.creator Karoly, Sean
dc.date 2017-07-31
dc.date.accessioned 2017-12-21T20:16:26Z
dc.date.available 2017-12-21T20:16:26Z
dc.identifier doi:10.13021/G8NT2J
dc.identifier.uri http://hdl.handle.net/1920/10849
dc.description.abstract Testing for Milankovitch cycles in stratigraphy enables observations of astronomical forcing impacts on climate change, sedimentary cyclicity, carbon sequestration, and climatic effects on organisms. Since Milankovitch cycles are global in nature, their recognition in stratigraphy also provides a means for geologic time determination and high-resolution global correlation. Here this testing is applied to the organic black marine shales at the Demerara Rise (western equatorial Atlantic Ocean) deposited during Oceanic Anoxic Event 2 (OAE2) delineating the Cenomanian-Turonian boundary in the early Late Cretaceous period. Stratigraphic correlation of the Demerara Rise to OAE2-age sediment in the Western Interior Seaway and North Atlantic and Tethys oceans relies largely on inconsistent biostratigraphy and chemostratigraphy, in particular a large, positive marine carbon isotope excursion (CIE). High-resolution grayscale data from Ocean Drilling Program Leg 207 drill cores at the Demerara Rise depict millimeter to meter scale sedimentological variations before, during, and after OAE2 that can be correlated to the CIE. Superimposed meter-scale cyclicity in the grayscale stratigraphic series provides evidence for Milankovitch forcing, and leads to new key refinements in the time-series analysis and global correlation of OAE2. en_US
dc.language.iso en en_US
dc.subject Milankovitch en_US
dc.subject cyclostratigraphy en_US
dc.subject OAE2 en_US
dc.subject cyclicity en_US
dc.subject Demerara Rise en_US
dc.subject Ocean Anotic Event en_US
dc.title Milankovitch Cyclicity and Global Time Constraint of Cretaceous Black Shales and Oceanic Anoxic Event 2 at the Demerara Rise, Western Equatorial Atlantic Ocean en_US
dc.type Thesis en_US
thesis.degree.name Master of Science in Earth Systems Science en_US
thesis.degree.level Master's en_US
thesis.degree.discipline Earth Systems Science en_US
thesis.degree.grantor George Mason University en_US


Files in this item

This item appears in the following Collection(s)

Show simple item record

Search MARS


Browse

My Account

Statistics