气候变化领域集成服务门户(CCPortal): Petrogenesis of Early Triassic Felsic Volcanic Rocks in the East Kunlun Orogen, Northern Tibet: Implications for the Paleo-Tethyan Tectonic and Crustal Evolution

CCPortal

DOI	10.3390/min13050607
	Petrogenesis of Early Triassic Felsic Volcanic Rocks in the East Kunlun Orogen, Northern Tibet: Implications for the Paleo-Tethyan Tectonic and Crustal Evolution
	Yan, Dongdong; Chu, Zhiqiang; Liu, Zhongyuan; Wang, Wei; Xiong, Fuhao
发表日期	2023
EISSN	2075-163X
卷号	13 期号:5
英文摘要	The felsic volcanic rocks in orogenic belts are vital probes to understand the tectonic evolution and continental crust growth. Here, we present a comprehensive study on the zircon U-Pb geochronology, whole-rock geochemistry, and zircon Lu-Hf isotopes of Early felsic volcanic rocks from the Hongshuichuan Formation, East Kunlun Orogen, Northern Tibet, aiming to explore their petrogenesis and implications for the Paleo-Tethyan orogeny and crustal evolution. The studied felsic volcanics comprise rhyolite porphyry and rhyolite, exhibiting coeval zircon U-Pb ages of ca. 247-251 Ma. Rhyolite porphyries show metaluminous to peraluminous nature (A/CNK = 0.88-1.24) with high SiO2 contents (72.1-78.9 wt%) and moderate Mg-# values (22-40), and they display enrichment of LREE with (La/Yb)(N) ratios of 6.02-17.9 and depletion of high field strength elements. In comparison, the rhyolites are strongly peraluminous (A/CNK = 1.09-1.74) with high SiO2 contents (71.7-74.3 wt%) and high Mg-# values (43-52) and are also enriched in LREE ((La/Yb)(N) of 6.65-18.4) and depleted in HFSE (e.g., Nb, Ta, Ti). Combining with their different zircon Lu-Hf isotopes, i.e., enriched isotopes for the rhyolite porphyries (epsilon Hf(t) = -7.3 to -3.8) and depleted Hf isotopes for the rhyolites (epsilon Hf = -0.6 to +3.0), we interpret that the studied rhyolite porphyries and rhyolites were derived by partial melting of Mesoproterozoic metagreywacke sources followed by plagioclase-dominated fractional crystallization, but the latter shows the significant contribution of crust-mantle magma mixing. The mixed mantle-derived magma comes from an enriched lithospheric mantle source that had been metasomatized by subduction-related fluids. Combining with other geological evidence, we propose that the studied Early Triassic felsic volcanic rocks were formed in a subduction arc setting, and the reworking of ancient continental crust with crust-mantle magma mixing is the major mechanism of crustal evolution in the East Kunlun Paleo-Tethyan orogenic belt.
关键词	East Kunlun felsic volcanic rocks Early Triassic Paleo-Tethyan tectonic setting
英文关键词	A-TYPE GRANITES; MAFIC MICROGRANULAR ENCLAVES; TRACE-ELEMENT; PLATEAU IMPLICATIONS; RHYOLITE SUITE; PELITIC SYSTEM; GEOCHEMISTRY; CHINA; ORIGIN; BELT
WOS研究方向	Geochemistry & Geophysics ; Mineralogy ; Mining & Mineral Processing
WOS记录号	WOS:000996801400001
来源期刊	MINERALS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/283353
作者单位	Chengdu University of Technology; Chengdu University of Technology; Chengdu University of Technology
推荐引用方式 GB/T 7714	Yan, Dongdong,Chu, Zhiqiang,Liu, Zhongyuan,et al. Petrogenesis of Early Triassic Felsic Volcanic Rocks in the East Kunlun Orogen, Northern Tibet: Implications for the Paleo-Tethyan Tectonic and Crustal Evolution[J],2023,13(5).
APA	Yan, Dongdong,Chu, Zhiqiang,Liu, Zhongyuan,Wang, Wei,&Xiong, Fuhao.(2023).Petrogenesis of Early Triassic Felsic Volcanic Rocks in the East Kunlun Orogen, Northern Tibet: Implications for the Paleo-Tethyan Tectonic and Crustal Evolution.MINERALS,13(5).
MLA	Yan, Dongdong,et al."Petrogenesis of Early Triassic Felsic Volcanic Rocks in the East Kunlun Orogen, Northern Tibet: Implications for the Paleo-Tethyan Tectonic and Crustal Evolution".MINERALS 13.5(2023).