Isotopic composition of strontium in sea water throughout Phanerozoic time

Composition and timing of carbonate vein precipitation within the igneous basement of the Early Cretaceous Shatsky Rise, NW Pacific

“…Seawater Sr is readily incorporated into precipitating calcite (substituting for Ca) and since the 87 Sr/ 86 Sr isotopic composition of seawater has varied over geological time (e.g. Peterman et al, 1970;Hart and Staudigel, 1978;Veizer et al, 1999;McArthur et al, 2001), the Sr isotopic ratio of the veins can potentially determine the time of carbonate precipation.…”

“…The systematic changes of 87 Sr/ 86 Sr, as recorded in marine carbonates, have long been used for constraining the ages of marine limestones and fossil carbonate shells (e.g. Peterman et al, 1970, Burke et al, 1982.…”

Geochemical and Isotopic Evaluation of Groundwater Movement in Corrective Action Unit 97: Yucca Flat/Climax Mine, Nevada Test Site, Nevada, Rev. No.: 0

“…The NTS groundwater from alluvial, volcanic, and clastic units frequently exhibits 36 Cl/Cl ratios that are greater than 6x10 -13 and can range as high as 9.7 x10 -13 . These waters are interpreted to reflect a paleoclimatic 36 Cl signature, inherited from groundwater recharge that occurred during the last pluvial period, when the climate in southern Nevada was notably less arid relative to current conditions (e.g., Mifflin and Wheat, 1979;Spaulding, 1985;Quade et al, 1995 [Peterman et al, 1970;Burke et al, 1982] (Osmond & Cowart, 1976;Rosholt, 1983). Alpha-recoil processes associated with decay of 238 U result in preferential dissolution of 234 U from solid surfaces and 234 U/ 238 U activity ratios in migrating water that are greater than 1.0.…”

Pelagic and Hemipelagic Sediments of the Izu-Bonin Region, Leg 126: Geochemical and Compositional Features

“…The 87 Sr/ 86 Sr ratios in the ocean have changed systematically during Phanerozoic time (Peterman et al, 1970). Burke et al (1982) obtained the average Sr isotopic ratio, 0.70910 ± 0.00004, by analyzing 42 samples of modern marine carbonate from all over the world.…”