Mathematics – Logic
Scientific paper
Nov 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982esrv...18..365g&link_type=abstract
Earth Science Reviews, Volume 18, Issue 3-4, p. 365-365.
Mathematics
Logic
4
Scientific paper
Many K-Ar age determinations on mineral concentrates from granitoids of the Patagonian Cordillera between 40° and 42°S have supported the distinction of a zonation and an apparent migration from east to west of the intrusive loci in geological times. This zonation is based upon the evidence of a marginal eastern belt of granitic rocks considered as Upper Paleozoic-Triassic (?), an intermediate area of Upper Cretaceous granitoids, and an even internal, belt of Tertiary age. This progressive lower age of magmatic episodes towards the west, is also corroborated by stratigraphical data. On the Chilean slope a similar reverse zonation has been proposed, although conflicting data have been found.
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