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Evidence for anoxia at the Ediacaran–Cambrian boundary: the record of redox-sensitive trace elements and rare earth elements in Oman

Schröder, S. and Grotzinger, J. P. (2007) Evidence for anoxia at the Ediacaran–Cambrian boundary: the record of redox-sensitive trace elements and rare earth elements in Oman. Journal of the Geological Society, 164 (1). pp. 175-187. ISSN 0016-7649. doi:10.1144/0016-76492005-022. https://resolver.caltech.edu/CaltechAUTHORS:20130220-131806861

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Abstract

The Ediacaran–Cambrian boundary in Oman is characterized by a globally correlative negative δ^(13)C_(carb) excursion in platform carbonate rocks, and deposition of basinal organic-rich rocks. These observations may relate to the development of local, and possibly global, anoxia. We have studied redox-sensitive trace elements (TE) and REE from basinal and platform successions. Detrital input and authigenic element enrichment were the main factors controlling the record of TE and REE. Trace elements in the basin are enriched relative to crustal concentrations. In siliceous rocks, TE enrichment was decoupled from detrital input, suggesting authigenic concentration of TE under anoxic (possibly sulphidic) water column conditions. Trace elements and REE indicate higher detrital input in shales. Element enrichment was minimally influenced by detrital input in the platform carbonate rocks; it is strongest in the basal platform section, coincident with the carbon isotope excursion. The results suggest development of anoxia in a stagnant basinal water mass. Overturn or upward expansion of the deep water charged with TE and isotopically light C produced anoxia on the platform, and was probably related to development of the isotope excursion. These results are consistent with anoxia in boundary strata of Iran, and with the hypothesis of global anoxia at this time.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1144/0016-76492005-022DOIArticle
http://jgs.geoscienceworld.org/content/164/1/175PublisherArticle
ORCID:
AuthorORCID
Schröder, S.0000-0003-1870-3663
Grotzinger, J. P.0000-0001-9324-1257
Additional Information:© 2007 Geological Society of London. Received 21 February 2005; revised typescript accepted 22 June 2006. Scientific editing by John Marshall. Petroleum Development Oman, LLC gave financial and logistical support and permission to publish these results. Financial support was provided by NASA grant NAG5-9445 to J.P.G., and by the 'Gemeinsames Sonderprogramm III von Bund und Ländern', distributed through the German Academic Exchange Service (DAAD), to S.S. Helpful comments by D. Fike on an earlier version and thoughtful reviews by T. Lyons and an anonymous reviewer greatly enhanced the manuscript. The authors wish to thank B. Bergquist, E. Boyle, C. Colonero, S. Higgins, S. Huang, R. Kayser, J. Morford and R. Summons for valuable help in the laboratory.
Funders:
Funding AgencyGrant Number
Petroleum Development OmanUNSPECIFIED
NASANAG5-9445
Deutscher Akademischer Austauschdienst (DAAD)UNSPECIFIED
Issue or Number:1
DOI:10.1144/0016-76492005-022
Record Number:CaltechAUTHORS:20130220-131806861
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20130220-131806861
Official Citation: S. Schröder and J.P. Grotzinger Evidence for anoxia at the Ediacaran–Cambrian boundary: the record of redox-sensitive trace elements and rare earth elements in Oman Journal of the Geological Society, January 2007, v. 164, p. 175-187, doi:10.1144/0016-76492005-022
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:37022
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:20 Feb 2013 21:50
Last Modified:09 Nov 2021 23:26

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