CaltechAUTHORS
  A Caltech Library Service

An Appalachian Amazon? Magnetofossil evidence for the development of a tropical river-like system in the mid-Atlantic United States during the Paleocene-Eocene thermal maximum

Kopp, Robert E. and Schumann, Dirk and Raub, Timothy D. and Powars, David S. and Godfrey, Linda V. and Swanson-Hysell, Nicholas L. and Maloof, Adam C. and Vali, Hojatollah (2009) An Appalachian Amazon? Magnetofossil evidence for the development of a tropical river-like system in the mid-Atlantic United States during the Paleocene-Eocene thermal maximum. Paleoceanography, 24 . PA4211. ISSN 0883-8305. http://resolver.caltech.edu/CaltechAUTHORS:20091205-144532263

[img]
Preview
PDF (Author's version of published manuscript. Auxiliary material included.) - Accepted Version
See Usage Policy.

6Mb

Use this Persistent URL to link to this item: http://resolver.caltech.edu/CaltechAUTHORS:20091205-144532263

Abstract

On the mid-Atlantic Coastal Plain of the United States, Paleocene sands and silts are replaced during the Paleocene-Eocene Thermal Maximum (PETM) by the kaolinite-rich Marlboro Clay. The clay preserves abundant magnetite produced by magnetotactic bacteria and novel, presumptively eukaryotic, iron-biomineralizing microorganisms. Using ferromagnetic resonance spectroscopy and electron microscopy, we map the magnetofossil distribution in the context of stratigraphy and carbon isotope data and identify three magnetic facies in the clay: one characterized by a mix of detrital particles and magnetofossils, a second with a higher magnetofossil-to-detrital ratio, and a third with only transient magnetofossils. The distribution of these facies suggests that suboxic conditions promoting magnetofossil production and preservation occurred throughout inner middle neritic sediments of the Salisbury Embayment but extended only transiently to outer neritic sediments and the flanks of the embayment. Such a distribution is consistent with the development of a system resembling a modern tropical river-dominated shelf.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1029/2009PA001783DOIArticle
ORCID:
AuthorORCID
Kopp, Robert E.0000-0003-4016-9428
Additional Information:Received 18 April 2009; accepted 18 August 2009; published 5 December 2009. Acknowledgments. We thank Jerry Dickens, Neal Driscoll, Lucy Edwards, Mihaela Glamoclija, Dennis Kent, Ken Miller, and two anonymous reviewers for helpful comments and discussion. We thank Jim Browning for assistance sampling A, M, and SG and Ellen Thomas for access to samples of BR. New Jersey samples were provided by the Integrated Ocean Drilling Program (IODP). Maryland and Virginia samples were provided by the U.S. Geological Survey (USGS). Amazon samples were provided by Robert Aller. Research funding was provided in part by NASA Exobiology and Evolutionary Biology grant NNX07AK12G (to Joseph Kirschvink). REK was funded by a Princeton University Woodrow Wilson School Science, Technology, and Environmental Policy program postdoctoral fellowship. DS and HV were supported by grants from the Natural Science and Engineering Research Council (NSERC) of Canada and the Fonds québécois de la recherche sur la nature et les technologies (FQRNT) to the Centre for Biorecognition and Biosensors.
Funders:
Funding AgencyGrant Number
NASANNX07AK12G
Princeton UniversityUNSPECIFIED
Natural Sciences and Engineering Research Council of Canada (NSERC)UNSPECIFIED
Fonds québécois de la recherche sur la nature et les technologies (FQRNT)UNSPECIFIED
Centre for Biorecognition and BiosensorsUNSPECIFIED
Subject Keywords:Paleocene-Eocene thermal maximum, magnetofossils, Marlboro Clay
Record Number:CaltechAUTHORS:20091205-144532263
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20091205-144532263
Official Citation:Kopp, R. E., D. Schumann, T. D. Raub, D. S. Powars, L. V. Godfrey, N. L. Swanson-Hysell, A. C. Maloof, and H. Vali (2009), An Appalachian Amazon? Magnetofossil evidence for the development of a tropical river-like system in the mid-Atlantic United States during the Paleocene-Eocene thermal maximum, Paleoceanography, 24, PA4211, doi:10.1029/2009PA001783
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided. Copyright 2009 by the American Geophysical Union.
ID Code:16882
Collection:CaltechAUTHORS
Deposited By: Robert E. Kopp
Deposited On:18 Dec 2009 22:25
Last Modified:17 May 2017 22:21

Repository Staff Only: item control page