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Science 11 November 1977:
Vol. 198. no. 4317, pp. 614 - 617
DOI: 10.1126/science.198.4317.614
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Articles

The Charnockite Geotherm

S. K. SAXENA 1

1 Department of Geology, Brooklyn College, City University of New York, Brooklyn 11210

Charnockite, a hypersthene-bearing granite, and other associated rocks of the charnockite series have a global distribution. These rocks, according to evidence from mineral-chemical and experimental phase equilibrium relations, formed or recrystallized at temperatures between 800° and 900°C and at relatively shallow depths of 6 to 12 kilometers. This evidence indicates the existence of geothermal gradients of 70° to 100°C per kilometer probably at various times, the latest being around 1300 x 106 years ago.

Submitted on April 14, 1977
Revised on June 9, 1977

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Science. ISSN 0036-8075 (print), 1095-9203 (online)