Mississippian Paleocean Chemistry from Biotic and Abiotic Carbonate, Muleshoe Mound, Lake Valley Formation, New Mexico, U.S.A.--Discussion

Dickson, J. A. D. (2009) Mississippian Paleocean Chemistry from Biotic and Abiotic Carbonate, Muleshoe Mound, Lake Valley Formation, New Mexico, U.S.A.--Discussion. Journal of Sedimentary Research, 79 (1). p. 40. ISSN 1527-1404 DOI https://doi.org/10.2110/jsr.2009.007

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Abstract

Hasiuk and Lohmann (2008) present a geochemical study of cement and crinoid remains from the much studied Mississippian Muleshoe mud mound, New Mexico, U.S.A. They deduce Mississippian paleocean chemistry from data on altered cement and crinoids that are assumed to have recrystallized in sea water and retained their original marine chemistry. It is surprising in this context that they present data for just one brachiopod, as brachiopods are accepted as one of the most reliable marine proxies! They do not discuss the interpretation of Muleshoe brachiopod data made by Wu and Chafetz (2002). The latter authors differentiate intermound from mound brachiopods by their {delta}13C values; higher mound values are thought to be due to seepage of 13C-enriched waters produced by methanogenic bacteria. The Muleshoe mound is interpreted by Stanton et al. (2000) as being deposited in water ~ 200 m deep in the dysoxic oxygen-minimum zone (OMZ). Consequently, can Muleshoe carbonate influenced by methane seepage and deposited in the OMZ be regarded as an appropriate choice of material for an open marine proxy?

Item Type:	Article
Uncontrolled Keywords:	09AREP; IA60;
Subjects:	05 - Petrology - Igneous, Metamorphic and Volcanic Studies
Divisions:	05 - Petrology - Igneous, Metamorphic and Volcanic Studies
Journal or Publication Title:	Journal of Sedimentary Research
Volume:	79
Page Range:	p. 40
Identification Number:	https://doi.org/10.2110/jsr.2009.007
Depositing User:	Sarah Humbert
Date Deposited:	22 Mar 2010 15:45
Last Modified:	23 Jul 2013 09:56
URI:	http://eprints.esc.cam.ac.uk/id/eprint/1352

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