气候变化领域集成服务门户(CCPortal): The long-lived partial melting of the Greater Himalayas in southern Tibet, constraints from the Miocene Gyirong anatectic pegmatite and its prospecting potential for rare element minerals

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DOI	10.31035/cg2022061
	The long-lived partial melting of the Greater Himalayas in southern Tibet, constraints from the Miocene Gyirong anatectic pegmatite and its prospecting potential for rare element minerals
	Cao, Hua-wen; Pei, Qiu-ming; Yu, Xiao; Chen, Yong; Liu, Hang; Zhang, Kai; Liu, Xin; Zhang, Xiang-fei
发表日期	2023
ISSN	2096-5192
起始页码	303
结束页码	321
卷号	6 期号:2
英文摘要	The Cenozoic Himalayan leucogranite-pegmatite belt has been a hotspot for rare metal exploration in recent years. To determine the genesis of the pegmatite in the Himalayan region and its relationship with the Greater Himalayan Crystalline Complex (GHC), the Gyirong pegmatite in southern Tibet was chosen for geochronological and geochemical studies. The dating analyses indicate that the U-Th-Pb ages of zircon, monazite, and xenotime exhibit large variations (38.6-16.1 Ma), with the weighted average value of the four youngest points is 16.5 & PLUSMN; 0.3 Ma, which indicates that the final stage of crystallization of the melt occurred in the Miocene. The age of the muscovite Ar-Ar inverse isochron is 15.2 & PLUSMN; 0.4 Ma, which is slightly later than the intrusion age, showing that a cooling process associated with rapid denudation occurred at 16-15 Ma. The & epsilon;Hf(t) values of the Cenozoic anatectic zircons cluster between -12 and -9 with an average of -11.4. The Gyirong pegmatite shows high contents of Si, Al, and K, a high Al saturation index, and low contents of Na, Ca, Fe, Mn, P, Mg, and Ti. Overall, the Gyirong pegmatite is enriched in Rb, Cs, U, K, Th and Pb and depleted in Nb, Ta, Zr, Ti, Eu, Sr, and Ba. The samples show a high 87Sr/86Sr(16Ma)ratio of ca. 0.762 and a low & epsilon;Nd(16 Ma)value of -16.0. The calculated average initial values of208Pb/204Pb(16 Ma),207Pb/204Pb(16Ma)and 206Pb/204Pb(16Ma) of the whole rock are 39.72, 15.79 and 19.56, respectively. The Sr-Nd-Pb-Hf isotopic characteristics of the Gyirong pegmatite are consistent with those of the GHC. This study concludes that the Gyirong pegmatite represents a typical crustal-derived anatectic pegmatite with low metallogenic potential for rare metals. The Gyirong pegmatite records the long-term metamorphism and partial melting process of the GHC, and reflects the crustal thickening caused by thrust compression at 39-29 Ma and the crustal thinning induced by extensional decompression during 28-15 Ma.& COPY;2023 China Geology Editorial Office.
关键词	Partial melting of magma Anatectic pegmatite Zircon-monazite-xenotime U-Pb dating Sr-Nd-Pb isotopes Greater Himalayan crystalline complex Mineral exploration engineering Gyirong Tibet
英文关键词	INDIA-ASIA COLLISION; U-PB GEOCHRONOLOGY; TETHYAN HIMALAYA; TECTONIC IMPLICATIONS; GRANITIC PEGMATITES; ISOTOPE DISEQUILIBRIUM; CRUSTAL ANATEXIS; OROGENIC BELT; ZIRCON; ABLATION
WOS研究方向	Geosciences, Multidisciplinary
WOS记录号	WOS:001017363900001
来源期刊	CHINA GEOLOGY
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/283125
作者单位	Ministry of Natural Resources of the People's Republic of China; China Geological Survey; Chengdu Center, China Geological Survey; Chengdu University of Technology; Southwest Jiaotong University; China Geological Survey; Ministry of Natural Resources of the People's Republic of China; China University of Geosciences - Wuhan
推荐引用方式 GB/T 7714	Cao, Hua-wen,Pei, Qiu-ming,Yu, Xiao,et al. The long-lived partial melting of the Greater Himalayas in southern Tibet, constraints from the Miocene Gyirong anatectic pegmatite and its prospecting potential for rare element minerals[J],2023,6(2).
APA	Cao, Hua-wen.,Pei, Qiu-ming.,Yu, Xiao.,Chen, Yong.,Liu, Hang.,...&Zhang, Xiang-fei.(2023).The long-lived partial melting of the Greater Himalayas in southern Tibet, constraints from the Miocene Gyirong anatectic pegmatite and its prospecting potential for rare element minerals.CHINA GEOLOGY,6(2).
MLA	Cao, Hua-wen,et al."The long-lived partial melting of the Greater Himalayas in southern Tibet, constraints from the Miocene Gyirong anatectic pegmatite and its prospecting potential for rare element minerals".CHINA GEOLOGY 6.2(2023).