Sr isotopic variations in Upper Proterozoic carbonates from Svalbard and East Greenland

Details Sr isotopic variations in Upper Proterozoic carbonates from Svalbard and East Greenland Sr isotopic variations in Upper Proterozoic carbonates from Svalbard and East Greenland

Sep 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989gecoa..53.2331d&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 53, Sept. 1989, p. 2331-2339.

Other

6

Air Water Interactions, Carbonates, Greenland, Strontium Isotopes, Chemical Composition, Marine Chemistry, Sea Water, Stratigraphy, Strontium 87

Scientific paper

Precambrian Sr isotope stratigraphy was investigated by determining variations in Sr-87/Sr-86 ratios in the Upper Proterozoic carbonate succession from Svalbard and East Greenland. Data from this study were combined with those from literature to construct a curve of Sr-87/Sr-86 versus time for Upper Proterozoic seawater. The curve for the Upper Riphean-Vandian showed that the isotopic composition of Sr in seawater was low (Delta Sr-87 of about -500) between 900 and 650 Ma but rose rapidly to about +30 by 600 Ma (this range of long-term variation exceeds the total Phanerozoic variation). The very low values of Delta Sr-87 inferred for the Riphean require that, for this time, the submarine hydrothermal water flux was a large fraction of the Sr input to the oceans, while the rise in Delta Sr-87 in the Upper Proterozoic seawater reflects both a change in the ratio of hydrothermal and continental fluxes of Sr to the oceans, and a change in the isotopic composition of Sr from continental sources.

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