Tracking calcium in the San Joaquin basin, California: A strontium isotopic study of carbonate cements at North Coles Levee

Journal Article · Tue Aug 01 04:00:00 EDT 1989 · Geochimica et Cosmochimica Acta; (USA)

DOI:https://doi.org/10.1016/0016-7037(89)90319-0· OSTI ID:7164445

Schultz, J L; Boles, J R; Tilton, G R ^[1]

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1. Univ. of California, Santa Barbara (USA)

Strontium isotopes have been used as geochemical tracers of calcium to document pore water evolution and to trace mass transfer at the North Coles Levee reservoir in the central San Joaquin basin, California. At North Coles Levee, the arkosic Miocene Stevens sandstone has been progressively cemented with a series of carbonate zones, with isotopically calculated crystallization temperatures ranging from approximately 25 to 95{degree}C. This series of cement zones record a systematic decrease in the {sup 87}Sr/{sup 86}Sr ratios of the pore water since burial, from sea water ratios of 0.7086 in early (<40{degree}C) dolomite cements to near present-day pore water ratios of 0.7072 in the latest (>80{degree}C) calcite cements. Strontium analyses of potential Ca-Sr sources in the central basin indicate that plagioclase, rather than calcium smectite or microfossil tests, is the only potential source with low enough strontium ratios to account for the isotopic compositions of the cements and the present pore water. This implies that plagioclase alteration is the dominant influence on the Sr-Ca pore water evolution at North Coles Levee. The authors results indicate that calcium in the early calcites was derived from deeper in the basin, with mass transfer distances on the order of 1 km implied, and that calcium in later calcite cements was derived from plagioclase dissolving within the reservoir.

• OSTI ID: 7164445
• Journal Information: Geochimica et Cosmochimica Acta; (USA), Journal Name: Geochimica et Cosmochimica Acta; (USA) Vol. 53:8; ISSN GCACA; ISSN 0016-7037
• Country of Publication: United States
• Language: English

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