Other
Scientific paper
Mar 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981e%26psl..53...63g&link_type=abstract
Earth and Planetary Science Letters, Volume 53, Issue 1, p. 63-68.
Other
15
Scientific paper
Model P-T estimates from nearly 100 Precambrian rocks have been derived by comparing published descriptions of metamorphic mineral assemblages to a standard set of mineral stability data. Pressures, temperatures and metamorphic geotherms show large variations. Nevertheless, model P-T data reveal two distinct secular trends. Average metamorphic geotherms have declined through time, and average metamorphic pressures have increased through time. Metamorphic geotherms and pressures from Archean rocks average 54°C/km and 4.1 kbar, respectively. Corresponding figures for early Proterozoic terranes are 47°C/km and 4.3 kbar, and for late Proterozoic terranes 35°C/km and 6 kbar. These secular trends may reflect gradual cooling and thickening of the earth's crust, at least in orogenic belts. There are exceptions to both trends, found in localities where mineral assemblages indicate high pressures (6-12 kbar) and low metamorphic geotherms (20-30°C/km). These assemblages formed in Archean crust that, at least locally, was thicker than 20 km during metamorphism.
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