Physics
Scientific paper
Oct 1972
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1972gecoa..36.1091c&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 36, Issue 10, pp.1091-1100
Physics
1
Scientific paper
The ratio of rubidium to its carrier element potassium in most Coast Mountain plutonic rocks does not lie within the limits considered normal for continental whole-rocks. This suggests that either the alkalis involved were derived in part from destruction of an oceanic crust or that the batholith is an uplifted root-zone from which most of the alkalis have been driven. Either explanation fits well with suspected subduction of an oceanic crustal plate in conjunction with the formation of these suites. The weighted Rb / Sr ratio for the batholith is 0.046, and the present Sr 87 / Sr 86 values tend to be low. Thus the batholith is a major crustal regime preserving primitive isotopic ratios typical of strontium available to most continental igneous suites at time of their formation. The anomalous K / Rb values are shown to be characteristic of the coastal batholith only, and controlled locally by tectonic features. The unusually high strontium content appears to be related to plagioclase content and is common to plutonic rocks across the southern Cordillera of British Columbia.
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