Rb-Sr and Sm-Nd systematics of cherts and other siliceous deposits

Details Rb-Sr and Sm-Nd systematics of cherts and other siliceous deposits Rb-Sr and Sm-Nd systematics of cherts and other siliceous deposits

Apr 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987gecoa..51..959w&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 51, April 1987, p. 959-972.

Computer Science

2

Geochronology, Isotopes, Marine Chemistry, Quartz, Silicon Compounds, Neodymium, Rubidium, Samarium, Strontium

Scientific paper

An analysis of marine and lacustrine cherts demonstrates that Rb-Sr and Sm-Nd systems may be used in elucidating the origin and evolution of cherts, and that the Rb-Sr system may be used for dating. All samples have high Rb/Sr ratios, and though the site of these elements in cherts was not established, they appear to be correlated with Al content. Sm/Nd ratios were typical of continental sources, and the results show the Rb-Sr system in cherts to be isolated from the associated carbonate, with little Sr exchange. Data suggest that in many cases cherts are formed by dissolved SiO2 nucleating on clay-like material which preserves the isotropic characteristics of the detrital source, while in some cases it is possible that cherts were formed from silica-saturated waters from a nonmarine source.

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