Chuar Group of the Grand Canyon: Record of Breakup of Rodinia, Associated Change in the Global Carbon Cycle, and Ecosystem Expansion by 740 Ma

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Chuar Group of the Grand Canyon: Record of Breakup of Rodinia, Associated Change in the Global Carbon Cycle, and Ecosystem Expansion by 740 Ma

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Title: Chuar Group of the Grand Canyon: Record of Breakup of Rodinia, Associated Change in the Global Carbon Cycle, and Ecosystem Expansion by 740 Ma
Author: Weil, Arlo B.; Des Marais, David J.; Crossey, Laura J.; Sharp, Zachary D.; Karlstrom, Karl E.; Elrick, Maya B.; Davidek, Kathleen L.; Geissman, John W.; Timmons, J. Michael; Knoll, Andrew; Dehler, Carol M.; Bowring, Samuel A.; Porter, Susannah M.

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Citation: Karlstrom, Karl E., Samuel A. Bowring, Carol M. Dehler, Andrew H. Knoll, Susannah M. Porter, David J. Des Marais, Arlo B. Weil, Zachary D. Sharp, John W. Geissman, Maya B. Elrick, J. Michael Timmons, Laura J. Crossey, and Kathleen L. Davidek. 2000. Chuar Group of the Grand Canyon: Record of breakup of Rodinia, associated change in the global carbon cycle, and ecosystem expansion by 740 Ma. Geology 28(7): 619-622.
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Abstract: The Chuar Group (similar to 1.600 m thick) preserves a record of extensional tectonism, ocean-chemistry fluctuations, and biological diversification during the late Neoproterozoic Era. An ash layer from the top of the section has a U-Pb zircon age of 742 +/- 6 Ma. The Chuar Group was deposited at low latitudes during extension on the north-trending Butte fault system and is inferred to record rifting during the breakup of Rodinia. Shallow-marine deposition is documented by tide- and wave-generated sedimentary structures, facies associations, and fossils. C isotopes in organic carbon show large stratigraphic variations, apparently recording incipient stages of the marked C isotopic fluctuations that characterize later Neoproterozoic time. Upper Chuar rocks preserve a rich biota that includes not only cyanobacteria and algae, but also heterotrophic protists that document increased food web complexity in Neoproterozoic ecosystems, The Chuar Group thus provides a well-dated, high-resolution record of early events in the sequence of linked tectonic, biogeochemical, environmental and biological changes that collectively ushered in the Phanerozoic Eon.
Published Version: http://dx.doi.org/10.1130/0091-7613(2000)28<619:CGOTGC>2.0.CO;2
Other Sources: http://www.geol.ucsb.edu/faculty/porter/Papers/Karlstrom_et_al_2000.pdf
Citable link to this page: http://nrs.harvard.edu/urn-3:HUL.InstRepos:3007650

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  • FAS Scholarly Articles [7594]
    Peer reviewed scholarly articles from the Faculty of Arts and Sciences of Harvard University
 
 

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