Combined Zircon, Molybdenite, and Cassiterite Geochronology and Cassiterite Geochemistry of the Kuntabin Tin-Tungsten Deposit in Myanmar

doi:10.5382/econgeo.4713

GIG OpenIR

	Mao, Wei 1; Zhong, Hong 1,2; Yang, Jiehua 1; Tang, Yanwen 1; Liu, Liang 1; Fu, Yazhou 1; Zhang, Xingchun 1; Sein, Kyaing 3; Aung, Soe Myint 3; Li, Jie 4; Zhang, Le 4
	Combined Zircon, Molybdenite, and Cassiterite Geochronology and Cassiterite Geochemistry of the Kuntabin Tin-Tungsten Deposit in Myanmar
刊名	ECONOMIC GEOLOGY
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.