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Fluid inclusion, zircon U-Pb geochronology, and O-S isotopic constraints on the origin and evolution of ore-forming fluids of the tashvir and varmazyar epithermal base metal deposits, NW Iran

文献类型：期刊论文

作者Kouhestani, Hossein6; Mokhtari, Mir Ali Asghar6; Chang, Zhaoshan1,4; Qin, Kezhang2,5; Marsa, Soheila Aghajani3
刊名FRONTIERS IN EARTH SCIENCE
出版日期2022-12-15
卷号10页码:27
关键词intermediate-sulfidation fluid inclusions stable isotopes geochronology NW Iran
DOI10.3389/feart.2022.990761
英文摘要Tashvir and Varmazyar deposits are part of the epithermal ore system in the Tarom-Hashtjin Metallogenic Belt (THMB), NW Iran. In both deposits, epithermal veins are hosted by Eocene volcanic-volcaniclastic rocks of the Karaj Formation and are spatially associated with late Eocene granitoid intrusions. The ore assemblages consist of pyrite, chalcopyrite, chalcocite, galena, and sphalerite (Fe-poor), with lesser amounts of bornite and minor psilomelane and pyrolusite. Fluid inclusion measurements from the Tashvir and Varmazyar revealed 182-287 and 194-285 degrees C formation temperatures and 2.7-7.9 and 2.6-6.4 wt.% NaCl equivalent salinities, respectively. The oxygen isotope data suggested that the mineralizing fluids originated dominantly from a magmatic fluid that mixed with meteoric waters. The sulfur isotope data indicated that the metal and sulfur sources were largely a mixture of magma and surrounding sedimentary rocks. LA-ICP-MS zircon U-Pb dating of the granitoid intrusion at Tashvir and Varmazyar, yielded a weighted mean age of 38.34-38.31 and 40.85 Ma, respectively, indicating that epithermal mineralization developed between 40.85 and 38.31 Ma. Our data indicated that fluid mixing along with some fluid boiling were the main drives for hydrothermal alteration and mineralization at Tashvir and Varmazyar. All these characteristics suggested an intermediate-sulfidation epithermal style of mineralization. The THMB is proposed to be prospective for precious and base metal epithermal mineralization. Considering the extensional tectonic setting, and lack of advanced argillic lithocaps and hypersaline fluid inclusions, the THMB possibly has less potential for economically important porphyry mineralization.
WOS关键词CU-AU DEPOSIT ; MAGMATIC-HYDROTHERMAL FLUIDS ; STABLE-ISOTOPE ; GOLD DEPOSIT ; PORPHYRY MINERALIZATION ; CHINA IMPLICATIONS ; METALLOGENIC BELT ; BRITISH-COLUMBIA ; SULFIDATION GOLD ; SOUTHERN KYUSHU
资助项目office of Vice Chancellor for Research and Technology, University of Zanjan, Zanjan, Iran ; EGRU (Economic Geology Research Centre), James Cook University, Townsville, Queensland, Australia
WOS研究方向Geology
语种英语
WOS记录号WOS:000900468600001
出版者FRONTIERS MEDIA SA
资助机构office of Vice Chancellor for Research and Technology, University of Zanjan, Zanjan, Iran ; office of Vice Chancellor for Research and Technology, University of Zanjan, Zanjan, Iran ; EGRU (Economic Geology Research Centre), James Cook University, Townsville, Queensland, Australia ; EGRU (Economic Geology Research Centre), James Cook University, Townsville, Queensland, Australia ; office of Vice Chancellor for Research and Technology, University of Zanjan, Zanjan, Iran ; office of Vice Chancellor for Research and Technology, University of Zanjan, Zanjan, Iran ; EGRU (Economic Geology Research Centre), James Cook University, Townsville, Queensland, Australia ; EGRU (Economic Geology Research Centre), James Cook University, Townsville, Queensland, Australia ; office of Vice Chancellor for Research and Technology, University of Zanjan, Zanjan, Iran ; office of Vice Chancellor for Research and Technology, University of Zanjan, Zanjan, Iran ; EGRU (Economic Geology Research Centre), James Cook University, Townsville, Queensland, Australia ; EGRU (Economic Geology Research Centre), James Cook University, Townsville, Queensland, Australia ; office of Vice Chancellor for Research and Technology, University of Zanjan, Zanjan, Iran ; office of Vice Chancellor for Research and Technology, University of Zanjan, Zanjan, Iran ; EGRU (Economic Geology Research Centre), James Cook University, Townsville, Queensland, Australia ; EGRU (Economic Geology Research Centre), James Cook University, Townsville, Queensland, Australia
源URL[http://ir.iggcas.ac.cn/handle/132A11/106963]  
专题地质与地球物理研究所_中国科学院矿产资源研究重点实验室
通讯作者Kouhestani, Hossein
作者单位1.Colorado Sch Mines, Dept Geol & Geol Engn, Golden, CO USA
2.Univ Chinese Acad Sci, Beijing, Peoples R China
3.Iranian Mineral Proc Res Ctr IMPRC, Mineral Labs, Karaj, Iran
4.James Cook Univ, Coll Sci & Engn, EGRU Econ Geol Res Ctr, Townsville, Qld, Australia
5.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing, Peoples R China
6.Univ Zanjan, Fac Sci, Dept Geol, Zanjan, Iran
推荐引用方式
GB/T 7714		 Kouhestani, Hossein,Mokhtari, Mir Ali Asghar,Chang, Zhaoshan,et al. Fluid inclusion, zircon U-Pb geochronology, and O-S isotopic constraints on the origin and evolution of ore-forming fluids of the tashvir and varmazyar epithermal base metal deposits, NW Iran[J]. FRONTIERS IN EARTH SCIENCE,2022,10:27.
APA Kouhestani, Hossein,Mokhtari, Mir Ali Asghar,Chang, Zhaoshan,Qin, Kezhang,&Marsa, Soheila Aghajani.(2022).Fluid inclusion, zircon U-Pb geochronology, and O-S isotopic constraints on the origin and evolution of ore-forming fluids of the tashvir and varmazyar epithermal base metal deposits, NW Iran.FRONTIERS IN EARTH SCIENCE,10,27.
MLA Kouhestani, Hossein,et al."Fluid inclusion, zircon U-Pb geochronology, and O-S isotopic constraints on the origin and evolution of ore-forming fluids of the tashvir and varmazyar epithermal base metal deposits, NW Iran".FRONTIERS IN EARTH SCIENCE 10(2022):27.

入库方式： OAI收割

来源：地质与地球物理研究所

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