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Contrasting geochemical signatures of fluid-absent versus fluid-fluxed melting of muscovite in metasedimentary sources: The Himalayan leucogranites

Gao, Li-E. and Zeng, Lingsen and Asimow, Paul D. (2017) Contrasting geochemical signatures of fluid-absent versus fluid-fluxed melting of muscovite in metasedimentary sources: The Himalayan leucogranites. Geology, 45 (1). pp. 39-42. ISSN 0091-7613. https://resolver.caltech.edu/CaltechAUTHORS:20161117-090300833

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Abstract

Most of the Himalayan Cenozoic leucogranites are products of partial melting of metapelite sources. In the Malashan-Gyirong area (southern Tibet), the geochemical compositions of leucogranites define two groups with distinct whole-rock major elements, large ion lithophile elements, rare earth elements, high field strength elements, and Sr and Hf isotope ratios. Based on published experimental results that define generalized melting reactions of metapelitic sources, we infer that these leucogranites are the products of two different types of crustal anatexis: fluid-fluxed melting and fluid-absent melting of muscovite in metasedimentary sources. As compared to the leucogranites derived from fluid-absent melting, those from fluid-fluxed melting have relatively higher Ca, Sr, Ba, Zr, Hf, Th, and light rare earth element concentrations, and Zr/Hf, Eu/Eu*, and Nd/Nd*, but lower Rb, Nb, Ta, and U concentrations, Rb/Sr and ^(87)Sr/^(86)Sr ratios, and ε_(Hf)(t). The geochemical differences can be explained by melting behaviors of major (muscovite, feldspar) and accessory minerals (zircon and monazite) during different modes of crustal anatexis. The systematic elemental and isotopic signatures of different types of crustal anatexis and, in particular, the coupling of major and trace elements that results from common influences on rock-forming and accessory mineral behaviors provide tools with which to refine our understanding of the nature of crustal anatexis.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1130/G38336.1DOIArticle
http://geology.gsapubs.org/content/45/1/39PublisherArticle
http://geology.geoscienceworld.org/content/45/1/39PublisherArticle
ORCID:
AuthorORCID
Asimow, Paul D.0000-0001-6025-8925
Additional Information:© 2016 Geological Society of America. Manuscript received 8 July 2016; Revised manuscript received 8 October 2016; Manuscript accepted 17 October 2016; First Published on November 03, 2016. This study was supported by National Key Research and Development Project of China (grant 2016YFC0600304), National Science Foundation of China (grants 41425010, 41503023, and 41273034), and China Geological Survey (grants 12120114022701 and 12120115027101). Participation by Asimow was supported by the U.S. National Science Foundation through Geoinformatics award EAR-1226270. Thanks go to Editor James Spotila for carefully handling this manuscript, and to Nigel Harris, Michael Brown, Calvin Miller, Antonio Acosta-Vigil, and one anonymous reviewer for their constructive comments.
Funders:
Funding AgencyGrant Number
National Key Research and Development Project of China2016YFC0600304
National Science Foundation of China41425010
National Science Foundation of China41503023
National Science Foundation of China41273034
China Geological Survey12120114022701
China Geological Survey12120115027101
NSFEAR-1226270
Issue or Number:1
Record Number:CaltechAUTHORS:20161117-090300833
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20161117-090300833
Official Citation:Li-E. Gao, Lingsen Zeng, and Paul D. Asimow Contrasting geochemical signatures of fluid-absent versus fluid-fluxed melting of muscovite in metasedimentary sources: The Himalayan leucogranites Geology, January 2017, v. 45, p. 39-42, first published on November 3, 2016, doi:10.1130/G38336.1
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:72103
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:17 Nov 2016 17:24
Last Modified:03 Oct 2019 16:14

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