Some of the material in is restricted to members of the community. By logging in, you may be able to gain additional access to certain collections or items. If you have questions about access or logging in, please use the form on the Contact Page.
Ingram, W. (2005). Anatomy of Oligocene-Miocene Debris Flows and Slumps from Demerara Rise: Implications for Margin Destruction. Retrieved from http://purl.flvc.org/fsu/fd/FSU_migr_etd-3869
Calcareous nannofossils and stable isotopes were analyzed to determine the timing and causes of extensive Miocene debris flows and Oligocene slumps recovered by Ocean Drilling Program (ODP), cruise Leg 207 to Demerara Rise along French Guiana and Suriname. Five modes of emplacement are considered for the Oligocene and Miocene failures. These hypotheses include canyon incision and infilling, clathrate dissociation, sediment loading, current activity, and seismic triggering. Calcareous nannofossil ages of the Miocene debris flows at Hole 1261A down to 351 mbsf indicate that the debris flow(s) were emplaced within the time period of Subzone NN11b (7.2 – 5.5 Ma). Hence, nannofossil biostratigraphy provides a time interval of 1.7 m.y. Compared to previous drilling along the New Jersey Transect these results indicate the mass wasted deposits here are fundamentally different, i.e., not the result of canyon incision and infilling. Instead, this study suggests that the emplacement of the Miocene debris flows resulted from high mass accumulation rates combined with a seismic trigger. Paleocurrent reorganization and/or sea-level changes best account for the Oligocene slumps.
A Thesis submitted to the Department of Geological Sciences in partial fulfillment of the requirements for the degree of Master of Science.
Bibliography Note
Includes bibliographical references.
Advisory Committee
Sherwood W. Wise, Jr., Professor Directing Thesis; Anthony J. Arnold, Committee Member; Philip Froelich, Committee Member.
Publisher
Florida State University
Identifier
FSU_migr_etd-3869
Use and Reproduction
This Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s). The copyright in theses and dissertations completed at Florida State University is held by the students who author them.
Ingram, W. (2005). Anatomy of Oligocene-Miocene Debris Flows and Slumps from Demerara Rise: Implications for Margin Destruction. Retrieved from http://purl.flvc.org/fsu/fd/FSU_migr_etd-3869
