Off-campus UMass Amherst users: To download campus access theses, please use the following link to log into our proxy server with your UMass Amherst user name and password.
Non-UMass Amherst users: Please talk to your librarian about requesting this thesis through interlibrary loan.
Theses that have an embargo placed on them will not be available to anyone until the embargo expires.
Access Type
Open Access
Document Type
thesis
Degree Program
Geography
Degree Type
Master of Science (M.S.)
Year Degree Awarded
January 2008
Month Degree Awarded
September
Abstract
Cretaceous Oceanic Anoxic Events (OAEs) represent periods of enhanced burial of organic matter in black shale in marine, continental margin, and epicontinental settings around the globe. Compared to other OAEs, comparatively little is known about the last of these widespread events, OAE 3 (Coniacian-Santonian). The Mancos Shale at Mesa Verde National Park is an Upper Cretaceous (Cenomanian-Campanian) formation containing marine sediments of the second-order Niobrara cyclothem and associated third-order transgressive-regressive events (T1-T4). The Coniancian-Santonian Niobrara interval is characterized as dark-gray, moderately to well laminated, calcareous shale and mudstone. Synthesis of new high-resolution bulk chemostratigraphy and biomarker analyses with the preexisting geochemical, lithological, and biostratigraphical framework suggest a temporally protracted oxygen minimum zone was largely responsible for the preservation of large quantities of organic matter contained in these sediments. Additionally, C/N and δ15Nbulk values imply denitrification and nitrogen fixation were both important metabolic processes during periods when surface water nutrient profiles may have differed much from those of the modern ocean.
DOI
https://doi.org/10.7275/576457
First Advisor
Steven T Petsch