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Petrogenesis of Bayinbulake Granite Porphyry in West Junggar, China: Evidences from Petrogeochemistry, Geochronology and Sr-Nd-Hf Isotopes(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2019年第06期
Page:
658-674
Research Field:
基础地质与矿产地质
Publishing date:

Info

Title:
Petrogenesis of Bayinbulake Granite Porphyry in West Junggar, China: Evidences from Petrogeochemistry, Geochronology and Sr-Nd-Hf Isotopes
Author(s):
LIU Zhen-yu1; LI Guang-lai1*; LIU Xiao-dong1;  CHEN Guang-xu1; WANG Guo2; SONG Jia2
(1. State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang 330013, Jiangxi, China; 2. No.216 Geological Party, China Nuclear Geology, Urumqi 830011, Xinjiang, China)
Keywords:
geochronology;  pretrogeochemistry;  petrogenesis;  granite porphyry;  Bayinbulake pluton;  Yangzhuang pluton;  Xuemisitan metallogenic belt;  West Jungger
PACS:
P588.12+1; P597
DOI:
-
Abstract:
Xuemisitan metallogenic belt in West Junggar is an important Chinese uranium polymetallic metallogenic belt with the massively distributed Paleozoic intermediate-acid intrusive plutons. These plutons provide an important basis for the exploration of Paleozoic magmatism and tectonic evolution of Xuemisitan metallogenic belt. The petrography, zircon U-Pb geochronology, petrogeochemistry and Sr-Nd-Hf isotopes of Bayinbulake granite porphyry in the southeastern margin of Xuemisitan metallogenic belt were studied systematically. The results show that the granite porphyry is formed in(393.7±1.7)Ma(MSWD is 1.3), belonging to Early Devonian, and invades into Silurian Xuemisitan Formation; the granite porphyry is characterized by high Si, poor H2O, high Al, rich alkali(especially K), low Mg and Fe, belonging to metaluminous-peraluminous series A2 sub-type granite; the granite porphyry is enriched in Rb, Th, U, etc., and depleted in Sr, P, Ti, etc., chondrite-normalized REE pattern is a right-leaning type with relative rich LREE, and the granite porphyry has the characteristics of obvious LREE and HREE fractionation, higher contents of total REE, and apparent Eu negative anomaly; the variation range of Nd isotopic composition is small, εNd(t)is 4.3-6.7 with the two-stage Nd model age of 591-788 Ma, indicating that the magma is relatively homogeneous, and εHf(t)is 3.98-9.35 with the two-stage Hf model age of 794-1 130 Ma, indicating that the diagenetic material maybe come from Neoproterozoic depleted mantle. In general, Bayinbulake pluton is formed in subduction setting, which causes partial melting of the mantle, and is mixed with a small amount of ancient crustal material during the rising along the subduction zone. Compared with Yangzhuang pluton, Bayinbulake pluton has the prospect of forming industrial uranium deposits.

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Last Update: 2019-11-19