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Geology and geochemistry of the high-grade Zankan magnetite ore, Western Kunlun Mountains, NW China

文献类型：期刊论文

作者Li, Zhiquan2,3; Zhou, Yongzhang3; Yu, Pengpeng3; Zhang, Lianchang1; Wei, Wei5; Li, Yuhao2; Konhauser, Kurt O.2; Robbins, Leslie J.4
刊名ORE GEOLOGY REVIEWS
出版日期2022-11-01
卷号150页码:18
ISSN号0169-1368
关键词Iron formation High-grade magnetite ores Dacite-porphyry Silica leaching The Zankan iron deposit Western Kunlun Mountains
DOI10.1016/j.oregeorev.2022.105129
英文摘要Over the past decade, several magnetite-rich iron deposits have been discovered in the Taxkorgan region of the western Kunlun Mountains of northwestern China. These include the Zankan, Jiertieke, Laobing, Yelike, and Taaxi iron deposits. Prospective iron ore reserves are estimated at over 1 billion tons, with an average magnetite grade of 28% (Feng et al., 2018). The largest of the deposits, the Zankan Iron Deposit (ZID), is estimated to contain 628 million tons of iron ore, with at least 10% of the ores being high-grade (TFe > 50 wt%). However, the geological processes by which the high-grade ores in the ZID were formed remains poorly constrained. In this study, we combine whole rock and ore geochemistry data, oxygen and sulfur stable isotopes, and uranium-lead and hafnium isotopes from zircons to elucidate the plausible mechanisms underpinning the formation of the ZID ores. Based on mineralogy, we define two ore types. Type 1 is essentially comprised of quartz and magnetite, interlayered with schist, and it retains the sedimentary fabrics of the precursor iron-rich sediments which were an iron formation (IF). Type 2 formed by the intrusion of a dacite-porphyry into the IF which led to magnetite remobilization and recrystallization as manifest in magnetite-ferro actinolite veining. Rare earth element (REE) characteristics of the high-grade ores differs from those of the precursor IF, with chondrite normalized REE patterns showing enrichment of LREE and significant negative europium anomalies close to those of the dacite-porphyry. The oxygen and sulfur isotopic composition of magnetite and pyrite in the high-grade ores suggests a further meteoric influence on the ZID with silica enrichment driven by leaching of the precursor IF from else-where in the sequence. Circulation of the ore forming fluid is attributable to the development of faults and fracture zones that resulted from the intrusion of the dacite-porphyry. Laser ablation uranium-lead analyses of zircons from the dacite-porphyry yield two groups with ages of 551.25 +/- 3.32 Ma and 497.82 +/- 3.81 Ma, representing captured detrital zircons and the intrusive age of dacite porphyry, respectively. Given the intimate geological relationship between the dacite-porphyry and T2 ore, we suggest that the high-grade ores are formed after 497.82 Ma. Collectively our field observations and geochemical data reveal the detailed alteration processes that led to the development of the high-grade iron ores in the ZID, identifying distinctive features that may help to guide future exploration for additional high-grade ore deposits in the Taxkorgan region.
WOS关键词BANDED IRON-FORMATION ; HAMERSLEY PROVINCE ; LU-HF ; ISOTOPE SYSTEMATICS ; HYDROTHERMAL ORIGIN ; TRACE-ELEMENTS ; OROGENIC BELT ; TOM-PRICE ; GENESIS ; ZIRCON
资助项目National Natural Science Foundation of China ; National Key Research and Development program of China ; Guangdong Science and Technology Depart- ment ; Natural Sciences and En- gineering Research Council of Canada ; [41372100] ; [U1911202] ; [U1703242] ; [41902205] ; [2021YFC2900300] ; [GDKTP2020053500] ; [2020B1111370001]
WOS研究方向Geology ; Mineralogy ; Mining & Mineral Processing
语种英语
出版者ELSEVIER
WOS记录号WOS:000892616600001
资助机构National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key Research and Development program of China ; National Key Research and Development program of China ; Guangdong Science and Technology Depart- ment ; Guangdong Science and Technology Depart- ment ; Natural Sciences and En- gineering Research Council of Canada ; Natural Sciences and En- gineering Research Council of Canada ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key Research and Development program of China ; National Key Research and Development program of China ; Guangdong Science and Technology Depart- ment ; Guangdong Science and Technology Depart- ment ; Natural Sciences and En- gineering Research Council of Canada ; Natural Sciences and En- gineering Research Council of Canada ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key Research and Development program of China ; National Key Research and Development program of China ; Guangdong Science and Technology Depart- ment ; Guangdong Science and Technology Depart- ment ; Natural Sciences and En- gineering Research Council of Canada ; Natural Sciences and En- gineering Research Council of Canada ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key Research and Development program of China ; National Key Research and Development program of China ; Guangdong Science and Technology Depart- ment ; Guangdong Science and Technology Depart- ment ; Natural Sciences and En- gineering Research Council of Canada ; Natural Sciences and En- gineering Research Council of Canada
源URL[http://ir.iggcas.ac.cn/handle/132A11/107653]  
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Zhou, Yongzhang; Yu, Pengpeng
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China
2.Univ Alberta, Dept Earth & Atmospher Sci, Edmonton T6G 2E3, AB, Canada
3.Sun Yat sen Univ, Sch Earth Sci & Geol Engn, Guangdong Prov Key Lab Geol Proc & Mineral Resourc, Guangzhou 510275, Peoples R China
4.Univ Regina, Dept Geol, Regina S4S 0A2, SK, Canada
5.China Univ Geosci, Sch Earth Sci, Wuhan 430074, Peoples R China
推荐引用方式
GB/T 7714		 Li, Zhiquan,Zhou, Yongzhang,Yu, Pengpeng,et al. Geology and geochemistry of the high-grade Zankan magnetite ore, Western Kunlun Mountains, NW China[J]. ORE GEOLOGY REVIEWS,2022,150:18.
APA Li, Zhiquan.,Zhou, Yongzhang.,Yu, Pengpeng.,Zhang, Lianchang.,Wei, Wei.,...&Robbins, Leslie J..(2022).Geology and geochemistry of the high-grade Zankan magnetite ore, Western Kunlun Mountains, NW China.ORE GEOLOGY REVIEWS,150,18.
MLA Li, Zhiquan,et al."Geology and geochemistry of the high-grade Zankan magnetite ore, Western Kunlun Mountains, NW China".ORE GEOLOGY REVIEWS 150(2022):18.

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来源：地质与地球物理研究所

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