Early miocene adakitic porphyries in the Chagai arc, Pakistan: Petrogenesis, tectonic setting and implications for porphyry Cu-Au mineralization

doi:10.1016/j.lithos.2025.108023

GIG OpenIR > 深地室

	Miao, Xiu-Quan 1,2; Xue, Chuan-Dong 3; Yang, Xue-Ping 4,5; Zhang, Yun-Ying 1; Chen, Jian-Lin 4,5
	Early miocene adakitic porphyries in the Chagai arc, Pakistan: Petrogenesis, tectonic setting and implications for porphyry Cu-Au mineralization
刊名	LITHOS
ISSN号	0024-4937
	2025-06-01
卷号	502 页码:9
DOI	10.1016/j.lithos.2025.108023
语种	英语
WOS研究方向	Geochemistry & Geophysics ; Mineralogy
摘要	Numerous porphyry Cu-Au deposits were formed in the Chagai arc, western Pakistan, but their origin remains debated. To address this issue, we conducted zircon U-Pb dating, zircon Hf-O and plagioclase Sr isotopic analyses, and geochemical characterization of ore-bearing biotite granitic porphyries (BGP) from the Saindak area in the Chagai arc. These BGP, formed during the early Miocene (21.9-21.7 Ma), exhibit adakite-like geochemical characteristics, including high SiO2 (60.5-67.9 wt%) and low Y (6.41-9.13 ppm) contents, coupled with high Sr/ Y (26.2-116) ratios. The depleted Hf (epsilon Hf(t) = 2.42-9.73) and mantle-like O (delta 18O = 4.99-6.06 parts per thousand) isotopic compositions of zircon grains, along with depleted Sr ((87Sr/86Sr)i = 0.70297-0.70482) isotopic compositions and high anorthite (An = 56.5-69.4 %) contents of plagioclase crystals, suggest that these BGP rocks were derived from an oceanic slab. Slab melting may cause the exceptionally high Cu (667-3060 ppm, average of 1416 ppm) contents of the studied BGP samples, which facilitates the formation of porphyry Cu-Au deposits.
关键词	Adakite Subducted oceanic slab Cu-au deposits Chagai arc Pakistan
WOS记录号	WOS:001439832600001
收录类别	SCI
引用统计	被引频次：1[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.gig.ac.cn/handle/344008/82996
专题	深地室
通讯作者	Chen, Jian-Lin
作者单位	1.Chinese Acad Sci, South China Sea Inst Oceanol, Innovat Acad South China Sea Ecol & Environm Engn, Key Lab Ocean & Marginal Sea Geol, Guangzhou 510301, Peoples R China 2.Minist Nat Resources, Key Lab Marine Mineral Resources, Guangzhou 511458, Peoples R China 3.Kunming Univ Sci & Technol KUST, Dept Earth Sci, Kunming 650093, Peoples R China 4.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Deep Earth Proc & Resources, Guangzhou 510640, Peoples R China 5.CAS Ctr Excellence Deep Earth Sci, Guangzhou 510640, Peoples R China
推荐引用方式 GB/T 7714	Miao, Xiu-Quan,Xue, Chuan-Dong,Yang, Xue-Ping,et al. Early miocene adakitic porphyries in the Chagai arc, Pakistan: Petrogenesis, tectonic setting and implications for porphyry Cu-Au mineralization[J]. LITHOS,2025,502:9.
APA	Miao, Xiu-Quan,Xue, Chuan-Dong,Yang, Xue-Ping,Zhang, Yun-Ying,&Chen, Jian-Lin.(2025).Early miocene adakitic porphyries in the Chagai arc, Pakistan: Petrogenesis, tectonic setting and implications for porphyry Cu-Au mineralization.LITHOS,502,9.
MLA	Miao, Xiu-Quan,et al."Early miocene adakitic porphyries in the Chagai arc, Pakistan: Petrogenesis, tectonic setting and implications for porphyry Cu-Au mineralization".LITHOS 502(2025):9.