Sedimentary cycling and environmental change in the Late Proterozoic - Evidence from stable and radiogenic isotopes

Details Sedimentary cycling and environmental change in the Late Proterozoic - Evidence from stable and radiogenic isotopes Sedimentary cycling and environmental change in the Late Proterozoic - Evidence from stable and radiogenic isotopes

Mar 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992gecoa..56.1317d&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 56, no. 3, March 1992, p. 1317-1329.

Computer Science

37

Carbon 13, Environment Effects, Geochemistry, Oxygen Isotopes, Precambrian Period, Sediments, Strontium Isotopes, Carbonates, Marine Chemistry, Ocean Bottom, Primitive Earth Atmosphere, Trace Elements

Scientific paper

Postdepositional diagenetic effects on primary isotopic compositions of a variety of limestones and dolomites from Vendian and late Riphean sedimentary successions worldwide are evaluated. A new delta C-13 curve for 850-500 Ma marine carbonates is constructed. Delta C-13 values are high during most of the late Riphean with brief negative excursions likely associated with glacial periods. Similarly in the Vendian delta C-13 falls sharply around the Varanger glaciation and then returns to high values remaining until the Precambrian-Cambrian boundary. A simple model is constructed to explain the geochemical relationships and the implications of the relationships for changes in global geochemical cycles are explored. It is concluded that a significant and rapid increase in atmospheric O2 occurred in the Vendian. These findings have important implications for environmental changes during the first appearance of Ediacaran metazoan fauna.

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