Journal of Jilin University(Earth Science Edition) ›› 2016, Vol. 46 ›› Issue (3): 749-765.doi: 10.13278/j.cnki.jjuese.201603112

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Geochronology, Geochemistry and Geological Significance of Granite Porphyry in Hutouya Polymetallic Deposit, Qimantage Area, Qinghai Province

Zhang Xiaofei1,2, Li Zhiming1, Jia Qunzi1, Song Zhongbao1, Chen Xiangyang1, Zhang Yulian1, Li Dongsheng3, Shu Xiaofeng3   

  1. 1. Xi'an Center of China Geological Survey, Xi'an 710054, China;
    2. Tianjin Testing and Quality Supervision Center for Geological and Mineral Products, The Ministry of Land and Resources, Tianjin 300191, China;
    3. Qinghai 3rd Geological and Mineral Resources Survey Institute, Xining 810029, China
  • Received:2015-10-12 Online:2016-05-26 Published:2016-05-26
  • Supported by:

    Supported by Geological Survey Projects of China Geological Survey(1212010918044, 1212011121089)

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Abstract:

Magmatic intrusions widely distributed in Qimantage area of Qinghai Province, are mostly located around NW-extending regional structure. The granite porphyry in Hutouya polymetallic deposit occurred in the joint position of the E-W extending and northwest-extending structures. Phenocrysts mainly include quartz, plagioclase, K-feldspar, biotite and amphibole.This paper reported major, trace, rare earth elements composition and LA-ICP-MS zircon U-Pb dating result about the granite porphyry. Simultaneously, geochemistry and petrography of the ore-hosting rock in the Hutouya polymetallic deposit are studied. The granite porphyry is characterized by high silicon, high potassium and low aluminum, and belongs to the high-K calc-alkaline series metaluminous-peraluminous granite. Trace elements are enriched in LILEs, depleted in HFSEs, and with Ba, Sr, Nb negative anomaly characteristics. In the REE partition diagram, the porphyry is in seagull form, having Eu negative anomaly character. The granite porphyry can be classified into the A2-subtype granite. The granite in the Hutouya ore district has the common geochemical charactersistics, genetic type, magma source and forming environment with the granite porphyry, which indicates that they formed the granitic complex. The complex was originated from the common magma source and emplaced in the extensional environment occurring after the post-collision transitional period from compression to extension of East Kunlun orogenic belt. LA-ICP-MS Zircon U-Pb dating of the granite yielded (232.7±1.8) Ma(MSWD=1.3, n=22), representing the fact that the East Kunlun was in the end stage of the intracontinental orogeny during Indosinian. Large-scale magmatism led to the Indosinian mineralization in the Qimantage area.

Key words: Qimantage in Qinghai Province, Hutouya, zircon U-Pb dating, A2 subtype granite, geochemistry

CLC Number: 

  • P588.12

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