Knowledge Management System Of Guangzhou Institute of Geochemistry,CAS
Mao, Wei1; Zhong, Hong1,2; Yang, Jiehua1; Tang, Yanwen1; Liu, Liang1; Fu, Yazhou1; Zhang, Xingchun1; Sein, Kyaing3; Aung, Soe Myint3; Li, Jie4; Zhang, Le4 | |
Combined Zircon, Molybdenite, and Cassiterite Geochronology and Cassiterite Geochemistry of the Kuntabin Tin-Tungsten Deposit in Myanmar | |
刊名 | ECONOMIC GEOLOGY
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ISSN号 | 0361-0128 |
2020-05-01 | |
卷号 | 115期号:3页码:603-625 |
DOI | 10.5382/econgeo.4713 |
语种 | 英语 |
WOS研究方向 | Geochemistry & Geophysics ; Mineralogy |
摘要 | The Kuntabin Sn-W deposit, located in southern Myanmar, is characterized by abundant greisen-type and quartz vein-type cassiterite and wolframite mineralization. We have conducted multiple geochronological methods and isotope and trace element analyses to reveal the age and evolution of the Kuntabin magmatic-hydrothermal system. Zircon U-Pb dating of the two-mica granite yielded a weighted mean Pb-206/U-238 age of 90.1 +/- 0.7 Ma. Cassiterite U-Pb dating provided a lower intercept age of 88.1 +/- 1.9 Ma in the Tera-Wasserburg U-Pb concordia diagram. Molybdenite Re-Os dating returned a weighted mean model age of 87.7 +/- 0.5 Ma and an isochron age of 88.7 +/- 2.7 Ma. These ages indicate a genetic relationship between granite and Sn-W mineralization in the Kuntabin deposit and record the earliest magmatism and Sn-W mineralization in the Sibumasu and Tengchong terranes related to subduction of the Neo-Tethys oceanic slab. Three generations of cassiterite have been identified with distinctive cathodoluminescence textures and trace element patterns, indicating the episodic input of ore-forming fluids and distinctive changes in the physical-chemical conditions of the Kuntabin magmatic-hydrothermal system. Sudden changes of fluid pressure, temperature, pH, etc., may have facilitated the deposition of Sn and W. Rhenium contents of molybdenite from the Kuntabin deposit and many other Sn-W deposits in Myanmar are characteristically low compared to porphyry Cu-Mo-(Au) deposits worldwide. In combination with zircon Hf isotope signatures, we infer that granites associated with Sn-W deposits in Myanmar were predominantly derived by melting of ancient continental crust and contain minimal mantle contribution. Subduction of the Neo-Tethys oceanic slab from west of the West Burma terrane reached beneath the Sibumasu terrane and led to magmatism and Sn-W mineralization at similar to 90 Ma when the Kuntabin deposit was formed. The Paleoproterozoic Sibumasu crust was activated during the subduction-related magmatism to form predominantly crust derived melts. After a high degree of fractional crystallization and fluid exsolution, physical-chemical changes of the hydrothermal fluid resulted in Sn and W precipitation to form the Kuntabin Sn-W deposit. |
WOS记录号 | WOS:000532696200007 |
收录类别 | SCI |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://ir.gig.ac.cn/handle/344008/59403 |
通讯作者 | Zhong, Hong; Yang, Jiehua |
作者单位 | 1.Chinese Acad Sci, Inst Geochem, State Key Lab Ore Deposit Geochem, Guiyang 550081, Peoples R China 2.Univ Chinese Acad Sci, Guiyang 550081, Peoples R China 3.Myanmar Geosci Soc, Yangon 11041, Myanmar 4.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou 510640, Peoples R China |
推荐引用方式 GB/T 7714 | Mao, Wei,Zhong, Hong,Yang, Jiehua,et al. Combined Zircon, Molybdenite, and Cassiterite Geochronology and Cassiterite Geochemistry of the Kuntabin Tin-Tungsten Deposit in Myanmar[J]. ECONOMIC GEOLOGY,2020,115(3):603-625. |
APA | Mao, Wei.,Zhong, Hong.,Yang, Jiehua.,Tang, Yanwen.,Liu, Liang.,...&Zhang, Le.(2020).Combined Zircon, Molybdenite, and Cassiterite Geochronology and Cassiterite Geochemistry of the Kuntabin Tin-Tungsten Deposit in Myanmar.ECONOMIC GEOLOGY,115(3),603-625. |
MLA | Mao, Wei,et al."Combined Zircon, Molybdenite, and Cassiterite Geochronology and Cassiterite Geochemistry of the Kuntabin Tin-Tungsten Deposit in Myanmar".ECONOMIC GEOLOGY 115.3(2020):603-625. |
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