Computer Science
Scientific paper
Nov 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993gecoa..57.5019b&link_type=abstract
Geochimica et Cosmochimica Acta, Volume 57, Issue 21-22, p. 5019-5025.
Computer Science
11
Scientific paper
The 87Sr/86Sr ratios of dissolved strontium in six Sierra Nevada streams at base flow are 0.00070 to 0.00175 higher than the average whole-rock value for the granodiorite bedrock underlaying the drainage basins. We suggest that the strontium isotope ratios and major cation compositions of the stream waters are controlled predominantly by the weathering reactions: plagioclase ⇒ kaolinite and biotite ⇒ vermiculite. Stream drainages that were glaciated ˜10 kyr ago (exposing fresh bedrock surfaces) have 87Sr/86Sr ratios 0.00036 to 0.00105 higher than drainages that were not glaciated in the past ˜100 kyr. We interpret the 87Sr/86Sr ratios of the stream water to indicate that biotite is weathering ˜6 times and ˜4 times more rapidly than plagioclase in the recently glaciated and nonglaciated drainages, respectively. Our results suggest that continental glaciation may have the effect of accelerating biotite weathering, significantly elevating riverine 87Sr/86Sr ratios in regions draining silicate bedrock for periods of ˜100 kyr.
Blum Joel D.
Brown Kevin
Erel Yigal
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