High Oxygen Fugacity and Slab Melting Linked to Cu Mineralization: Evidence from Dexing Porphyry Copper Deposits, Southeastern China

被引：118
作者：
Zhang, Hong [1 ,2 ,3 ]
Ling, Ming-Xing [2 ]
Liu, Yu-Long [1 ]
Tu, Xiang-Lin [2 ]
Wang, Fang-Yue [4 ]
Li, Cong-Ying [1 ,2 ,3 ]
Liang, Hua-Ying [1 ]
Yang, Xiao-Yong [4 ]
Arndt, Nicholas T. [5 ]
Sun, Wei-Dong [1 ,6 ]
机构：
[1] Chinese Acad Sci, Guangzhou Inst Geochem, CAS Key Lab Mineral & Metallogeny, Guangzhou 510640, Peoples R China
[2] Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou 510640, Peoples R China
[3] Grad Univ, Chinese Acad Sci, Beijing 100049, Peoples R China
[4] Univ Sci & Technol China, Sch Earth & Space Sci, Hefei 230026, Peoples R China
[5] Univ Grenoble, Inst Sci Terre, F-38401 St Martin Dheres, France
[6] Guangzhou Mass Spectrometer Ctr, Guangzhou 510640, Peoples R China
来源：
JOURNAL OF GEOLOGY | 2013年 / 121卷 / 03期
关键词：
MAFIC-ULTRAMAFIC INTRUSIONS; LOWER CONTINENTAL-CRUST; MESOZOIC IGNEOUS ROCKS; NORTHERN DABIE COMPLEX; EAST-CENTRAL CHINA; IN-SITU ANALYSIS; SOUTH CHINA; TECTONIC IMPLICATIONS; ARC MAGMAS; GEOCHEMICAL CONSTRAINTS;
D O I：
10.1086/669975
中图分类号：
P5 [地质学];
学科分类号：
0709 ; 081803 ;
摘要：
The Dexing porphyry Cu deposit is the largest Cu deposit in eastern China, with total reserves of 8.4 Mt Cu. The Dexing porphyries have geochemical characteristics typical of adakites: they are similar to examples in the Circum-Pacific Belt and in the Lower Yangtze River Belt but different from adakites from the Dabie Mountains and the Tibetan Plateau. Ce4+/Ce3+ and (Eu/Eu*)(N) values calculated from zircon trace-element compositions vary from 495 N to 1922 and from 0.51 to 0.82, respectively, and reflect high oxygen fugacity similar to that measured in or inferred for porphyry Cu-Au deposits in the South America. The high oxygen fugacity is consistent with abundant anhydrite and magnetite-hematite intergrowths in the porphyry, which indicate that the highest oxygen fugacity of Dexing porphyry reached the hematite-magnetite buffer. Based on the geochemical characteristics and the drifting history of the Pacific Plate, we propose that the Dexing adakitic porphyries formed through slab melting, most likely during subduction of an aseismic ridge in the Pacific Plate in the Mid-Jurassic.
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页码：289 / 305
页数：17
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