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Spencer, Jon E
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Water samples from the Colorado River and its tributaries provide a present-day 87Sr/86Sr profile of the Colorado River system from Moab, Utah, down to the Gulf of California. 87Sr/86Sr values around 0.7097 are prevalent above the Grand Canyon, and values of 0.7103 or higher are observed below the Grand Canyon. 87Sr/86Sr values close to the seawater ratio of 0.70917 are seen near the Colorado River delta. All tributaries except the Green River contribute Sr that is lower in 87Sr/86Sr than the main Colorado. The cause of the increase in 87Sr/86Sr through the Grand Canyon and Lake Mead area has not been found. Samples of carbonate and gypsum from the lower lacustrine member of the mid-Miocene to Pliocene Bidahochi...
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