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DOI	10.1016/j.oregeorev.2023.105662
	Zircon and apatite fingerprints on the magma fertility for the Jurassic igneous rocks in the southern Lhasa subterrane, Tibet
	Xie, Fuwei; Tang, Juxing; Jia, Min; Lang, Xinghai; Sun, Yang; He, Yifei; Liu, Jinbo
发表日期	2023
ISSN	0169-1368
EISSN	1872-7360
卷号	161
英文摘要	The products of long-lasting magmatism (ca. 170 Myr) related to the northward subduction of the Neo-Tethys Ocean are preserved in the southern Lhasa subterrane (SLT). However, only a few large porphyry Cu-Au deposits related to these igneous rocks have been discovered in the Xiongcun ore concentration area. Here, we present zircon and apatite data on Jurassic fertile suites (FS), barren suites (BS), and recently proposed prospecting target suites (PTS) in the SLT, intending to present a case study of the regional-scale porphyry metallogenic potential. The zircon geochemical data with Rayleigh fractionation modeling show that the zircon geochemical characteristics of the FS and PTS were affected by high proportions of amphibole and titanite crystallization, whereas the zircon geochemistry of the BS displays the effects of plagioclase fractionation or mixing with the least evolved melts. The zircon Ce4+/Ce3+ and Eu/Eu* values cannot be used to trace the oxygen fugacity of the magma due to prior or simultaneous mineral crystallization. However, the zircon Ce/Ce* and Ce/Nd ratios may be used as semiquantitative measures of the magma redox conditions. This result is similar to that calculated by the new magmatic oxybarometer using trace elements in zircon, showing that the FS (Delta FMQ = 1.21 +/- 0.42) and PTS (Delta FMQ = 1.29 +/- 0.51) have higher oxygen fugacity levels than the BS (Delta FMQ = 0.40 +/- 0.88). The melt S contents estimated from magmatic apatites are lower in the FS and PTS than in the BS, which is attributed to prior anhydrite crystallization under high oxygen fugacity and low temperature conditions. The higher Cl in the melt of the FS (average 0.098 wt%) than in the melts of the PTS (average 0.045 wt%) and BS (average 0.04 wt%) shows that elevated Cl contents in melts are likely important for forming porphyry Cu-Au deposits. The combined geochemical characteristics of zircon and apatite suggest that a high oxygen fugacity (Delta FMQ > 1.2), prior or concurrent anhydrite crystallization, and high zircon Eu/Eu* (>0.6), Ce4+/Ce3+, and (Yb/Dy)(N) values can be used to refine potential porphyry Cu-Au targets on a regional scale in the SLT. High melt Cl contents and apatite MnO and Pb contents can effectively indicate fertile suites at the deposit scale.
关键词	Porphyry indicator minerals Mineral chemistry Magma fertility Xiongcun porphyry Cu -Au deposit Southern Lhasa subterrane
英文关键词	PORPHYRY CU-MO; TRACE-ELEMENT COMPOSITIONS; RARE-EARTH-ELEMENTS; TI-IN-ZIRCON; OXIDATION-STATE; XIONGCUN DISTRICT; COPPER BELT; U-PB; MINERAL EXPLORATION; GANGDESE BELT
WOS研究方向	Geology ; Mineralogy ; Mining & Mineral Processing
WOS记录号	WOS:001099935200001
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/283508
作者单位	Chengdu University of Technology
推荐引用方式 GB/T 7714	Xie, Fuwei,Tang, Juxing,Jia, Min,et al. Zircon and apatite fingerprints on the magma fertility for the Jurassic igneous rocks in the southern Lhasa subterrane, Tibet[J],2023,161.
APA	Xie, Fuwei.,Tang, Juxing.,Jia, Min.,Lang, Xinghai.,Sun, Yang.,...&Liu, Jinbo.(2023).Zircon and apatite fingerprints on the magma fertility for the Jurassic igneous rocks in the southern Lhasa subterrane, Tibet.ORE GEOLOGY REVIEWS,161.
MLA	Xie, Fuwei,et al."Zircon and apatite fingerprints on the magma fertility for the Jurassic igneous rocks in the southern Lhasa subterrane, Tibet".ORE GEOLOGY REVIEWS 161(2023).