The nature of O 18 /O 16 and C 13 /C 12 secular trends in sedimentary carbonate rocks

Details The nature of O 18 /O 16 and C 13 /C 12 secular trends in sedimentary carbonate rocks The nature of O 18 /O 16 and C 13 /C 12 secular trends in sedimentary carbonate rocks

Nov 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976gecoa..40.1387v&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 40, Issue 11, pp.1387-1395

Computer Science

77

Scientific paper

Measurements on 170 carbonate rocks show decreasing O 18 of similar magnitude for both limestones and dolomites over a time span of ~ 2800 m.y. The Proterozoic dolomites are on average heavier by ~5%. in O 18 than their coeval limestones. The data may indicate displacement in C 13 of about 3%. at approximately 570 m.y. ago, with Precambrian carbonates being heavier in C 13 at a given O 18 level than their Phanerozoic counterparts. The compilation of the previously published data is consistent with the above described features.

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