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SONG Zhong-bao, JIA Qun-zi, ZHANG Yu-lian, CHEN Bo, CHEN Xiang-yang, WANG Fu-chun, TIAN Yong-ge, LI Ya-zhi, ZHANG Xiao-fei, QUAN Shou-cun. 2012: LA-ICP-MS zircon U-Pb dating of Narigongma biotite granite porphyry in northern Sanjiang region and its geological significance. Geological Bulletin of China, 31(2-3): 439-447. DOI: 10.12097/gbc.2012020328
Citation: SONG Zhong-bao, JIA Qun-zi, ZHANG Yu-lian, CHEN Bo, CHEN Xiang-yang, WANG Fu-chun, TIAN Yong-ge, LI Ya-zhi, ZHANG Xiao-fei, QUAN Shou-cun. 2012: LA-ICP-MS zircon U-Pb dating of Narigongma biotite granite porphyry in northern Sanjiang region and its geological significance. Geological Bulletin of China, 31(2-3): 439-447. DOI: 10.12097/gbc.2012020328
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LA-ICP-MS zircon U-Pb dating of Narigongma biotite granite porphyry in northern Sanjiang region and its geological significance

  • Xi′an Center of Geological Survey, China Geological Survey, Xi′an 710054, Shaanxi, China; 2. Qinghai Geological Survey Institute, Xining 810012, Qinghai, China

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  • Narigongma biotite granite porphyry in northern Sanjiang region is an important porphyry type copper-molybdenum mineralization belt in Qinghai Province, and the Narigongma copper-molybdenum deposit is an intrusion-related porphyry type ore deposit recently discovered in northern Sanjiang region. The authors obtained the zircon U-Pb age of 41.53±0.24Ma for Narigongma biotite granite porphyry, which should belong to early Himalayan period. The main metallogenic age is between 40.86 and 40.8 Ma. In multi-phase hydrothermal superimposition and mineralization, the hydrothermal solution of the Narigongma porphyry copper-molybdenum deposit must have been derived from biotite granitite porphyry of 41.53±0.24 Ma and plagioclase granite porphyry of 41.0±0.18Ma. In virtue of existence of many intermediate-acid intrusive rocks, the age determination of these intrusive is not only of theoretical importance but also of practical significance in search for porphyry type copper-molybdenum deposits of the same epoch.
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