Abstract
Strontium isotopes have been used as geochemical tracers of calcium mass transfer and pore water evolution in the south-central San Joaquin basin, California. Carbonate cements in the Miocene Stevens sandstone record a systematic decrease in the {sup 87}Sr/{sup 86}Sr ratios of the pore water with time (temperature) since deposition in response to plagioclase alteration, and indicate three phases in the evolution of central basin pore waters: (1) Early dolomite cements ( 80C, all calcite cements have ratios in the 0.7072-0.7075 range, and appear strongly influenced by plagioclase alteration. At Coles Levee, this low-ratio Sr can be accounted for by local plagioclase dissolution, and implies a significant decrease in regional mass transfer in the later stages of the basin's history.« less
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