浙东南怀溪铜金矿床与曹门碱性花岗岩体成因关系的年代学制约

李艳军; 魏俊浩; 姚春亮; 鄢云飞; 谭俊; 彭丽娜; 肖广玲; 叶泽富

doi:10.3799/dqkx.2010.074

Volume 35 Issue 4

Jul. 2010

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Article Navigation > Earth Science > 2010 > 35(4): 585-596

LI Yan-jun, WEI Jun-hao, YAO Chun-liang, YAN Yun-fei, TAN Jun, PENG Li-na, XIAO Guang-ling, YE Ze-fu, 2010. Genetic Relationship of the Huaixi Copper-Gold Deposit and the Caomen Alkaline Granite, Southeastern Zhejiang Province, China: Constraint from Geochronologies. Earth Science, 35(4): 585-596. doi: 10.3799/dqkx.2010.074

Citation:

LI Yan-jun, WEI Jun-hao, YAO Chun-liang, YAN Yun-fei, TAN Jun, PENG Li-na, XIAO Guang-ling, YE Ze-fu, 2010. Genetic Relationship of the Huaixi Copper-Gold Deposit and the Caomen Alkaline Granite, Southeastern Zhejiang Province, China: Constraint from Geochronologies. Earth Science, 35(4): 585-596. doi: 10.3799/dqkx.2010.074

Citation:

LI Yan-jun, WEI Jun-hao, YAO Chun-liang, YAN Yun-fei, TAN Jun, PENG Li-na, XIAO Guang-ling, YE Ze-fu, 2010. Genetic Relationship of the Huaixi Copper-Gold Deposit and the Caomen Alkaline Granite, Southeastern Zhejiang Province, China: Constraint from Geochronologies. Earth Science, 35(4): 585-596. doi: 10.3799/dqkx.2010.074

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Genetic Relationship of the Huaixi Copper-Gold Deposit and the Caomen Alkaline Granite, Southeastern Zhejiang Province, China: Constraint from Geochronologies

doi: 10.3799/dqkx.2010.074

1.
Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China
2.
Zijin Mining Group Co., Ltd, Shanghang 364200, China
3.
No.11 Geological Team of Zhejiang Burean of Geology and Mineral Resources, Wenzhou 325006, China

Received Date: 2009-11-06
Publish Date: 2010-07-01

Abstract

Abstract

The Huaixi copper-gold deposit, located in depression area between the Zhenghe-Dapu and Changle-Nan'ao deep faults in southeastern Zhejiang Province, is a typical hydrothermal vein filling-metasomatic Cu-Au polymetallic deposit. The Caomen K-feldspar granite porphyry pulton is the dominant intrusion in the deposit. Petrography and chemical compositions show that it belongs to shoshonite series characterized by high silicon, and it is enriched in alkali and iron but depleted in phosphorus and titanium. Its SiO₂ contents range from 75.64% to 78.00%, while K₂O and K₂O/Na₂O ratios vary from 5.38% to 5.92% and 1.94 to 2.72 respectively. Ga, Rb, Th, U and Pb elements are enriched in the intrusion while Ba, Nb, Sr, P and Ti are depleted. REE is characterized with obvious negative anomalies with Eu/Eu^* 0.06-0.13 and exhibits right-dipping "V" patterns with LREE enrichment. Its mineralogy and geochemistry are consistent with those of Late Cretaceous alkaline granites in the coastal areas of Zhejiang-Fujian. This study offers the first highly precise dating of the diagenesis and mineralization in the deposit. The dating of zircon from the Caomen alkaline granite pulton determined by LA-ICP-MS yields age of 102±1 Ma (MSDW=1.3), while Rb and Sr isotopic dating of fluid inclusions in quartz of the Huaixi copper-gold deposit yields isochron age of 101±2 Ma. The results suggest that Cu-Au mineralization was consistent with granite crystallization. The ages of diagenesis and mineralization provide an important chronological constraint for the close genetic relationship of the deposit and the Caomen intrusion. The Huaixi Cu-Au deposit, originated from back-arc extensional tectonic-heat event related to high angle subduction of the ancient Pacific plate, caused by northward movement of the Indian plate, is corresponding to the time of the third large-scale mineralization regionally in the Mesozoic.
- LA-ICP-MS zircon U-Pb dating,
- geochronology,
- alkaline granite,
- Huaixi copper-gold deposit,
- Zhejiang Province

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References(71)

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Genetic Relationship of the Huaixi Copper-Gold Deposit and the Caomen Alkaline Granite, Southeastern Zhejiang Province, China: Constraint from Geochronologies

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