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- W2367565125 abstract "The eastern Himalayan Syntaxis is a key region to investigate the tectonic evolution of the Qinghai-Tibet Plateau. The internal structures, trace elements characteristics and ages of zircons from migmatitic gneiss at Motuo area in the eastern Himalayan Syntaxis were studied using cathodoluminescence(CL) images and LA-ICP-MS methods, respectively. The CL images show that many of the zircons have core-rim structure, including an inherited magmatic core and a crystallized rim with oscillatory zoning. The trace elements analyses show that there are notable differences between the cores and the rims. The core domains are distinguishable from the rim domains because of their higher Th, U, Nb, Ta concentrations and high Th/U ratios. Although having similar chondrite-normalized REE patterns, the core and rim domains have significantly different REE contents. The differences in REE contents between the cores and rims maybe relate to the chemical equilibrium between the melt and the restite. The LA-ICP-MS U-Pb zircon analyses indicate that:(1) the zircon cores give multi-stage magmatic event ages ranging from 516 Ma to 1826 Ma, of which six ages are converged on the range of 1330 Ma to 911 Ma, it is considered that the migmatitic gneiss has been formed in this time, while(2) the zircon rims yield 206Pb/238U weighted mean ages of 216.7±3.2 Ma(MSWD=3.9), which was interpreted to register the ages of the Triassic anatexis. The anatexis in Motuo is coeval with the regional metamorphism in the Lhasa terrane." @default.
- W2367565125 created "2016-06-24" @default.
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- W2367565125 date "2014-01-01" @default.
- W2367565125 modified "2023-09-23" @default.
- W2367565125 title "Zircon LA-ICP-MS U-Pb Dating of the Triassic Anatexis at Mutuo, the Eastern Himalayan Syntaxis" @default.
- W2367565125 hasPublicationYear "2014" @default.
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