Methane-derived carbonate cements in barrier and beach sands of a subtropical delta complex

Details Methane-derived carbonate cements in barrier and beach sands of a subtropical delta complex Methane-derived carbonate cements in barrier and beach sands of a subtropical delta complex

Aug 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975gecoa..39.1085r&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 39, Issue 8, pp.1085-1086

Mathematics

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4

Scientific paper

Highly negative C 13 values, -18 to - 40%., for carbonate cements found in Recent barrier and beach sands of the Mississippi River Delta complex strongly suggest that considerable carbon is furnished to the CaCO 3 cements by either chemical or biological oxidation of CH 4 . These cemented sands are commonly found on beaches of the Chandeleur barrier island chain and other sites along the Louisiana coast where Holocene sands are rapidly transgressing over highly organic marsh deposits. Generation of CH 4 from underlying anoxic marsh sediments, followed by vertical migration and oxidation to CO 2 in the porous overlying sand, appears to be the unique set of conditions regulating this process of carbonate cementation.

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