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Science 21 June 2002:
Vol. 296. no. 5576, pp. 2206 - 2208
DOI: 10.1126/science.1070622
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Reports

Insights into Collisional Magmatism from Isotopic Fingerprints of Melting Reactions

Kurt M. Knesel,1* Jon P. Davidson2

Piston-cylinder experiments in the granite system demonstrate that a variety of isotopically distinct melts can arise from progressive melting of a single source. The relation between the isotopic composition of Sr and the stoichiometry of the observed melting reactions suggests that isotopic signatures of anatectic magmas can be used to infer melting reactions in natural systems. Our results also indicate that distinct episodes of dehydration and fluid-fluxed melting of a single, metapelitic source region may have contributed to the bimodal geochemistry of crustally derived leucogranites of the Himalayan orogen.

1 Department of Earth Sciences, University of Queensland, Brisbane, Qld 4072, Australia.
2 Department of Earth Sciences, University of Durham, Durham, DH1 3LE, UK.
*   To whom correspondence should be addressed. E-mail: k.knesel{at}earth.uq.edu.au

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