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Shi, Qingshang and
(2021).
DOI: https://doi.org/10.1029/2021jb021839
Abstract
The petrogenesis of Himalayan leucogranites remains crucial for understanding the thermal and tectonic evolution of the Himalayan orogen. To understand whether they are largely pristine melts of crustal anatexis or have experienced a high degree of fractional crystallization (FC), we present Fe isotopic data of 30 representative Himalayan leucogranites and 9 local metasedimentary rocks. Excepting three garnet leucogranites with low δ56Fe (−0.04‰–0.06‰) that are likely affected by garnet accumulation, tourmaline, and two-mica leucogranites have largely homogeneous δ56Fe from 0.13‰ to 0.24‰ irrespective of their highly variable SiO2, MgO, and FeOt contents. Combined with observed mineral assemblages and available fractionation factors, this does not support a high degree of FC (with or without assimilation) in their petrogenesis. The elevated δ56Fe relative to the supposed source rocks, represented by metasedimentary rocks and/or metabasite with a δ56Fe value of 0.10‰, by ∼0.07‰, may reflect Fe isotope fractionation during crustal anatexis. This study indicates most leucogranites can provide robust constraints on the conditions of crustal anatexis and thus the thermal and tectonic evolution of the Himalayan orogen.
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About
- Item ORO ID
- 78442
- Item Type
- Journal Item
- ISSN
- 0148-0227
- Keywords
- Himalaya; Leucogranite; Iron isotopes; Petrogenesis
- Academic Unit or School
-
Faculty of Science, Technology, Engineering and Mathematics (STEM) > Environment, Earth and Ecosystem Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM) - Copyright Holders
- © 2021 American Geophysical Union.
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