内蒙古赤峰市大营子花岗岩体多期次侵入的证据及其地质意义

doi:10.13278/j.cnki.jjuese.201503112

Abstract

Abstract:

Dayingzi granite, which located in northwest Chifeng, Inner Monggolia, attracts great attention for its relation with Nianzigou molybdenum deposit in recent years. Our study shows that there are significant differences between the interior biotite monzonitic granite and the marginal orthoclase granite on the field occurrence, lithofacies, ore potentiality, petrological geochemistry and isotope chronology. These indicate that the granite is a composite rockmass with multistage intrusion. The overall geochemical features of Dayingzi granite is characterized by its high silicon,aluminumrich, alkali-rich, low magnesium, calcium-poor characteristics, with the enrichment of large ion lithophile elements (LILE)Rb,Th, while depleted of high field strength elements (HFSE) Ti, and P. The content of rare earth elements is high, obvious fractionation of light away from heavy rare earth with remarkable Eu negative anomaly. Even more remarkable Eu negative anomaly and lower trace elements of U, Ba and Sr are detected in marginal orthoclase granite than biotite granite. As ore-hosting rock of Jijiagou molybdenum deposit, the marginal orthoclase granite is a product of magmatism process in north margin of North China craton during Hercynian-Early Indo-Chinese epoch as indicated by its U-Pb isotopic age of (267.6±2.8); while as ore-hosting rock of Nianzigou molybdenum deposit, the interior biotite adamellite with a U-Pb isotopic age of (152.4±1.6) Ma, is a product of the intra-continental extension in a postorogenic or the large scale lithosphere thinning environment during Indo-Chinese Early Yanshanian.

Key words: Dayingzi granite, composite intrusion, Zircon U-Pb dating, geochemistry, Chifeng City in Inner Mongolia

CLC Number:

P588.1

Xi Aihua, Ma Yanjun, Ge Yuhui, Tang Xiangyang, Liu Shuai, Xu Bowen, Liu Jue. Multi-Stage Intrusive Evidence and Geological Significance of Dayingzi Granite in Chifeng,Eastern Inner Mongolia[J].Journal of Jilin University(Earth Science Edition), 2015, 45(3): 791-803.

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Multi-Stage Intrusive Evidence and Geological Significance of Dayingzi Granite in Chifeng,Eastern Inner Mongolia

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