Origin and Geological Implications of Monzogranites and Rhyolitic Porphyries in the Wunugetu Porphyry Copper-Molybdenum Deposit, Northeast China: Evidence from Zircon U-Pb-Hf Isotopes and Whole-Rock Geochemistry

被引:0
作者
Wang, Qingshuang [1 ,2 ]
Yang, Yanchen [1 ]
Fu, Qiulin [3 ]
Zhang, Zhongyue [4 ]
Guo, Xiaodan [5 ]
Wu, Taotao [2 ]
Chai, Lu [2 ]
Zhou, Yongheng [2 ]
An, Yonghai [5 ]
机构
[1] Jilin Univ, Coll Earth Sci, Changchun 130061, Peoples R China
[2] China Geol Survey, Shenyang Geol Survey Ctr, Shenyang 110034, Peoples R China
[3] Liaoning Prov Inst Geol & Mineral Resources Co Ltd, Shenyang 110034, Peoples R China
[4] Liaoning Earthquake Agcy, Shenyang 110031, Peoples R China
[5] Liaoning Geol Mineral Grp Energy Geol Co Ltd, Shenyang 110011, Peoples R China
关键词
Cu-Mo deposit; lithogeochemistry; I-type granite; Mongolia-Okhotsk Ocean; Wunugetu; NE CHINA; TRACE-ELEMENT; CONTINENTAL GROWTH; GRANITIC MAGMAS; VOLCANIC-ROCKS; CRUSTAL GROWTH; MO DEPOSIT; LU-HF; GEOCHRONOLOGY; CONSTRAINTS;
D O I
10.3390/min14030310
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
The Wunugetu deposit, a large-scale porphyry copper-molybdenum deposit, is located in the southern Erguna block. Its ore bodies are primarily found within monzogranites, granite porphyries, and biotite monzogranites. Additionally, the deposit contains late-stage intrusive dykes of rhyolitic porphyries. This study examined the deposit's monzogranites and rhyolitic porphyries using lithogeochemistry, zircon U-Pb dating, and Hf isotopic analysis. The main findings include: (1) Zircon U-Pb dating showed that the monzogranites formed around 209.0 +/- 1.0 Ma, whereas the rhyolitic porphyries in the northern portion formed around 170.49 +/- 0.81 Ma, suggesting magmatic activity in the deposit spanned from the Late Triassic to the Middle Jurassic. (2) The monzogranites exhibited high silicon content (73.16-80.47 wt.%) and relatively low aluminum content (10.98-14.37 wt.%). They are enriched in alkalis (content: 3.42-10.10 wt.%) and deficient in magnesium and sodium, with aluminum saturation indices (A/CNK) ranging from 1.1 to 2.9. In addition, the monzogranites are enriched in large-ion lithophile elements (LILEs) such as Rb, K, and Ba and deficient in high-field-strength elements (HFSEs) like Nb, P, and Ti. (3) The monzogranites have low Zr + Nb + Ce + Y contents of (151.3-298.6 ppm) x 10-6 and 10,000 x Ga/Al ratios varying between 1.20 and 2.33, suggesting that they are characteristic of I-type granites. (4) Positive zircon epsilon Hf(t) values ranging from +0.3 to +7.6 in both rhyolitic porphyry and monzogranite samples, increasing with younger emplacement ages, imply that the deposit's rocks originated from magmatic mixing between mantle-derived mafic magmas and remelts of the juvenile crust. Considering these results and the regional geological evolution, this study proposes that the Wunugetu deposit was formed in an active continental margin setting and was influenced by the Late Triassic-Middle Jurassic southeastward subduction of the Mongol-Okhotsk Ocean.
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相关论文
共 66 条
[61]  
[许文良 Xu Wenliang], 2019, [地球科学, Earth Science], V44, P1620
[62]  
Xu WL, 2013, ACTA PETROL SIN, V29, P339
[63]   Constraints on the timing of uplift of the Yanshan Fold and Thrust Belt, North China [J].
Yang, Jin-Hui ;
Wu, Fu-Yuan ;
Shao, Ji-An ;
Wilde, Simon A. ;
Xie, Lie-Wen ;
Liu, Xiao-Ming .
EARTH AND PLANETARY SCIENCE LETTERS, 2006, 246 (3-4) :336-352
[64]  
[杨宗锋 Yang Zongfeng], 2011, [矿床地质, Mineral Deposits], V30, P654
[65]  
[张璟 Zhang Jing], 2016, [地质通报, Geological Bulletin of China], V35, P1388
[66]   Petrogenesis of highly fractionated I-type granites in the Zayu area of eastern Gangdese, Tibet: Constraints from zircon U-Pb geochronology, geochemistry and Sr-Nd-Hf isotopes [J].
Zhu DiCheng ;
Mo XuanXue ;
Wang LiQuan ;
Zhao ZhiDan ;
Niu Yaoling ;
Zhou ChangYong ;
Yang YueHeng .
SCIENCE IN CHINA SERIES D-EARTH SCIENCES, 2009, 52 (09) :1223-1239