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sodium-rich volcanic rocks and their relationships with iron deposits in the Aqishan-Yamansu belt of Eastern Tianshan,NW China

引用

Geoscience Frontiers 2020年第2期11卷 697-713页

作者： Zhiyuan Sun WangJingbin Yuwang Wang Lingli Long Zhaohua Luo Xiaohua Deng Qitao Hu Menglong Wang Beijing Institute of Geology for Mineral Resources Beijing 100012China School of Earth Sciences and Resources China University of GeosciencesBeijing 100083China Shanshan Baodi Mining Limited Liability Company Shanshan 838204XinjiangChina

The volcanic rocks hosting the iron deposits in the Aqishan–Yamansu metallogenic belt are *** geochronology,petrography,and geochemistry of minerals and sodium-rich rocks as well as the relationship between these rocks and the iron deposits are ***,the ore-hosting volcanic rocks are sodiumrich(the averages of Na2O and Na2O/K2O are 4.31 wt.%and 8.56,respectively)and belong to the calc-alkaline *** are enriched in LREEs and LILEs(Ba,U,K,and Sr),but depleted in HFSEs(Nb,Ta,and Ti).SHRIMP zircon U–Pb dating of the crystal tuff in the Aqishan Formation and the dacite in the Tugutu Bulak Formation yields ages of 337.52.3 Ma(n?15,MSWD?0.85)and 313.03.3 Ma(n?13,MSWD?0.74),respectively,indicating that the sodium-rich volcanic rocks formed from the early–late *** microprobe data from plagioclases demonstrate that albites and/or oligoclases were formed in the basic–intermediate–acid volcanic *** stages of albitization are identified,and the latter is likely attributed to the dissolution of iron in the Aqishan–Yamansu *** sodium-rich volcanic rocks probably formed by the interaction between volcanic lava and seawater after volcanoes erupted on the seafloor;meanwhile,the albites formed by element substitution in a low-metamorphic *** spatiotemporal coupling relationship between sodium-rich volcanic rocks and iron deposits in the Aqishan–Yamansu belt is *** dissolved from the dark minerals of basic–intermediate volcanic rocks through sodium metasomatism is one of the material sources for the iron deposits.

关键词： sodium-rich volcanic rock Geochronology rock geochemistry Yamansu metallogenic belt Eastern tianshan orogenic belt

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