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Anatomy of Oligocene-Miocene Debris Flows and Slumps from Demerara Rise

Title: Anatomy of Oligocene-Miocene Debris Flows and Slumps from Demerara Rise: Implications for Margin Destruction.
Name(s): Ingram, Wesley, author
Wise, Sherwood W., Jr., professor directing thesis
Arnold, Anthony J., committee member
Froelich, Philip, committee member
Department of Earth, Ocean and Atmospheric Sciences, degree granting department
Florida State University, degree granting institution
Type of Resource: text
Genre: Text
Issuance: monographic
Date Issued: 2005
Publisher: Florida State University
Florida State University
Place of Publication: Tallahassee, Florida
Physical Form: computer
online resource
Extent: 1 online resource
Language(s): English
Abstract/Description: 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.
Identifier: FSU_migr_etd-3869 (IID)
Submitted Note: A Thesis submitted to the Department of Geological Sciences in partial fulfillment of the requirements for the degree of Master of Science.
Degree Awarded: Fall Semester, 2005.
Date of Defense: August 12, 2005.
Keywords: Calcareous Nannofossils, Debris Flows, Slumps, Demerara Rise
Bibliography Note: Includes bibliographical references.
Advisory Committee: Sherwood W. Wise, Jr., Professor Directing Thesis; Anthony J. Arnold, Committee Member; Philip Froelich, Committee Member.
Subject(s): Earth sciences
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Host Institution: FSU

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Ingram, W. (2005). Anatomy of Oligocene-Miocene Debris Flows and Slumps from Demerara Rise: Implications for Margin Destruction. Retrieved from