气候变化领域集成服务门户(CCPortal): The lithospheric cycle of ore-forming ingredients and the resultant recurrent 'flare-ups' of porphyry Cu deposits: Examples from the Yidun Arc, eastern Tibet

CCPortal

DOI	10.1016/j.oregeorev.2023.105809
	The lithospheric cycle of ore-forming ingredients and the resultant recurrent 'flare-ups' of porphyry Cu deposits: Examples from the Yidun Arc, eastern Tibet
	Jia, Zhen; Tao, Xingxiong; Li, Wenchang; Deng, Mingguo; Ren, Long
发表日期	2024
ISSN	0169-1368
EISSN	1872-7360
卷号	164
英文摘要	The porphyry Cu deposits with distinct mineralisation ages frequently occur as recurrent 'flare-ups' in a narrow region; however, the reasons controlling their occurrence are still debated. The eastern Yidun Arc in eastern Tibet produced a cluster of porphyry Cu deposits of the late Triassic and late Cretaceous ages, making it the ideal location for conducting this research. As a result, we use the late Triassic Xuejiping Cu-(Au) and late Cretaceous Hongshan-Hongniu Cu-Mo deposits as research objects, compiling new and published geochronological, elemental, and Sr-Nd-Hf isotopic data from their ore-forming porphyries to shed light on the above issue. The zircon U-Pb ages of the Xuejiping and Hongshan-Hongniu porphyries are 217.8 - 217.9 Ma and 78.7 Ma, respectively, and display adakitic characteristics. The Xuejiping porphyries present enriched Sr-Nd-Hf isotopes (0.70529 - 0.70590, -3.30 - -1.09, 0.40 - 2.20, respectively), low (Gd/Yb)N (2.24 - 3.20) and Nb/Ta (12.8 - 15.9) ratios, relatively high Nb (14.9 - 20.0 ppm) and Zr/Sm (23.4 - 41.5) values, indicating their origin in the partial melting of enriched mantle that is metasomatised by slab-melts and fluids in subduction zone. Furthermore, the Hongshan-Hongniu porphyry is adakitic, like the late Triassic igneous rocks in this area. Its Sr-Nd-Hf isotopes (0.69873 - 0.70996, -10.7 - -6.72, -14.9 - -0.50, respectively) are close to the isotopic evolution line of the late Triassic Xuejiping intrusions and show a trend towards the regional crystalline basement, which signify that the Hongshan-Hongniu porphyry mainly originated from the late Triassic juvenile crust, with some contributions from crystalline basement. One highly fractionated sample (i.e. HZK17-11-76) has extremely evolved Sr-Nd isotopes (0.70996 and -10.7, respectively), indicative of assimilation of sedimentary rocks. The new genetic models of the late Triassic and late Cretaceous porphyries in the Geza Arc show that the westward subduction of the Garze-Litang oceanic crust in the late Triassic triggered the occurrence of the highly oxidised and Cu-S-H2O rich adakitic melts in the middle-lower crust, which evolved to amphibole cumulates and porphyry Cu-(Au) deposits (i.e. Xuejiping) in the upper crust. In the late Cretaceous, the extensional environment triggered the re-melting of late Triassic juvenile cumulates and Mo-rich crystalline basement, resulting in Cu-Mo-S-H2O-rich, highly oxidised magma. Through fractional crystallisation and assimilation of Mo-rich sedimentary rocks, the magma eventually transformed into Hongshan-Hongniu porphyry-(skarn) type Cu-Mo deposits. In summary, we conclude that the periodic recycling of the ore-forming ingredients on a lithospheric scale from slab subduction to post-subduction periods controls the recurrent 'flare-ups' of PCDs in this confined area.
关键词	Recurrent 'flare-ups'Porphyry Cu deposits Late Triassic Late Cretaceous Yidun Arc
英文关键词	ZIRCON U-PB; VOLCANIC-MAGMATIC ARC; POLYMETALLIC DEPOSIT; METALLOGENIC SYSTEM; TECTONIC EVOLUTION; CHINA IMPLICATIONS; CONTINENTAL-CRUST; NORTHWEST YUNNAN; SANJIANG REGION; SULFIDE LIQUID
WOS研究方向	Geology ; Mineralogy ; Mining & Mineral Processing
WOS记录号	WOS:001142535200001
来源期刊	ORE GEOLOGY REVIEWS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/283394
作者单位	Kunming University of Science & Technology
推荐引用方式 GB/T 7714	Jia, Zhen,Tao, Xingxiong,Li, Wenchang,et al. The lithospheric cycle of ore-forming ingredients and the resultant recurrent 'flare-ups' of porphyry Cu deposits: Examples from the Yidun Arc, eastern Tibet[J],2024,164.
APA	Jia, Zhen,Tao, Xingxiong,Li, Wenchang,Deng, Mingguo,&Ren, Long.(2024).The lithospheric cycle of ore-forming ingredients and the resultant recurrent 'flare-ups' of porphyry Cu deposits: Examples from the Yidun Arc, eastern Tibet.ORE GEOLOGY REVIEWS,164.
MLA	Jia, Zhen,et al."The lithospheric cycle of ore-forming ingredients and the resultant recurrent 'flare-ups' of porphyry Cu deposits: Examples from the Yidun Arc, eastern Tibet".ORE GEOLOGY REVIEWS 164(2024).