Fractionation of uranium, thorium and rare earth elements in a vertically zoned granodiorite: Implications for heat production distributions in the Sierra Nevada batholith, California, U.S.A.

Details Fractionation of uranium, thorium and rare earth elements in a vertically zoned granodiorite: Implications for heat production distributions in the Sierra Nevada batholith, California, U.S.A. Fractionation of uranium, thorium and rare earth elements in a vertically zoned granodiorite: Implications for heat production distributions in the Sierra Nevada batholith, California, U.S.A.

May 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988gecoa..52.1131s&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 52, Issue 5, pp.1131-1143

Computer Science

7

Scientific paper

The abundances of heat-producing elements increase and of rare-earth elements decrease upward in a 1 km vertical section through a pluton in the eastern Sierra Nevada batholith, California. This distribution results mainly from magmatic processes and not from alteration. For samples containing between 47.7% and 65.5% SiO 2 , sphene is the predominant whole rock site for U, Th and REE. The variation in vertical heat production enables the characteristic depth scale ( D ) to be calculated from the linear heat flow-heat production relationship. The calculated value for the pluton, D = 2.2 km, is significantly lower than that of the batholith, D = 10.1 km, calculated from combined heat flow and heat generation. This result implies that plutons within a heat flow province may not follow the same distribution law for heat-producing elements. In the Sierra Nevada batholith two fundamentally different heat-producing element fractionation trends are evident. The western granitoids have inherently low heat production (0.2-1.5 W m -3 ) for compositions between 57% and 77% SiO 2 . The central-eastern granitoids have inherently high heat production (1.5-5.0 W m -3 ) for compositions between 57% and 77% SiO 2 . We conclude that there is no geochemical evidence to support an exponential vertical HPE distribution of heat-producing elements as the cause of a linear heat flow-heat production relationship in the Sierra Nevada batholith.

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