LA-ICP-MS cassiterite and zircon U-Pb ages of the Weilasituo tin-polymetallic deposit in the southern Great Xing an Range and their geological significance

doi:10.13745/j.esf.sf.2018.4.1

Earth Science Frontiers ›› 2018, Vol. 25 ›› Issue (5): 183-201.DOI: 10.13745/j.esf.sf.2018.4.1

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LA-ICP-MS cassiterite and zircon U-Pb ages of the Weilasituo tin-polymetallic deposit in the southern Great Xing an Range and their geological significance

LIU Ruilin,WU Guang,LI Tiegang,CHEN Gongzheng,WU Liwen,ZHANG Peichun,ZHANG Tong,JIANG Biao,LIU Wenyuan

1. MRL Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chines Academy of Geological Sciences, Beijing 100037, China
2. MOE Key Laboratory of Orogenic Belts and Crustal Evolution, Peking University, Beijing 100871, China
3. School of Earth Sciences and Resources, China University of Geosciences(Beijing), Beijing 100083, China
4. Inner Mongolia Institute of Geological Survey, Hohhot 010020, China
5. Fujian Key Laboratory of Mineral Resources, Zijin College of Mining, Fuzhou University, Fuzhou 350108, China

Received:2018-02-08 Revised:2018-03-09 Online:2018-09-15 Published:2018-09-15

Abstract

Abstract: The Weilasituo tin-polymetallic deposit, located in Hexigten Banner of Inner Mongolia, is a newly discovered large tin deposit associated with tungsten, zinc, copper, molybdenum, rubidium, niobium and tantalum the west slope of the southern Great Xingan Range. Three types of mineralization developed in the deposit: the deep section altered granite-type orebody is dominated by Sn and associated with Zn, Rb, Nb; the middle section cryptoexplosive breccia-type orebody is mainly of Sn with Cu and Zn; and the shallow section comprises quartz vein-type Sn, W, Zn, Cu, and Mo ore bodies. The quartz vein-type ore bodies are the most economically valuable ores, they are hosted within the NNE-trending shattered fault zones of the Paleoproterozoic Baoyintu Group and Middle Variscan quartz diorite, whereas the altered granite- and cryptoexplosive breccia-type ore bodies are usually low grade ores. A cassiterite sample from the quartz vein-type Sn ore of the Weilasituo deposit was selected for LA-ICP-MS dating, which yielded a 206Pb/207Pb238U/207Pb isochron age of 136.0±6.1 Ma (MSWD=0.94) and a 207Pb/206Pb238U/206Pb concordant age of 132.3±5.4 Ma (MSWD=2.8). The result suggested that the Weilasituo Sn-polymetallic mineralization took place during the Early Cretaceous. A zircon sample from the Beidashan granite was also selected for LA-ICP-MS dating, and the result of a weighted mean 206Pb/238U age of 140±2 Ma (MSWD=0.10) indicated the ore causative intrusion also formed during the Early Cretaceous. The Weilasituo tin-polymetallic deposit belongs to a granite-related magmatic-hydrothermal deposit. Our dating results, together with previous researchers rock- and ore-forming ages of other Sn-polymetallic deposits in the southern Great Xingan Range, demonstrated that almost all Sn-polymetallic deposits formed during 140135 Ma, which suggests that the Early Cretaceous is the peak era for the formation of the Sn-polymetallic deposits in the southern Great Xingan Range.

Key words: cassiterite U-Pb age, zircon U-Pb age, Weilasituo tin-polymetallic deposit, Inner Mongolia, southern Great Xingan Range

CLC Number:

P618.44

LIU Ruilin,WU Guang,LI Tiegang,CHEN Gongzheng,WU Liwen,ZHANG Peichun,ZHANG Tong,JIANG Biao,LIU Wenyuan. LA-ICP-MS cassiterite and zircon U-Pb ages of the Weilasituo tin-polymetallic deposit in the southern Great Xing an Range and their geological significance[J]. Earth Science Frontiers, 2018, 25(5): 183-201.

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LA-ICP-MS cassiterite and zircon U-Pb ages of the Weilasituo tin-polymetallic deposit in the southern Great Xing an Range and their geological significance

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