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Gold Science and Technology ›› 2018, Vol. 26 ›› Issue (4): 454-464.doi: 10.11872/j.issn.1005-2518.2018.04.454

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Sr-Nd Isotope Constraints on the Source of Ore-forming Elements of Zankan Iron Deposit in the Taxkorgan Terrane of West Kunlun Orogen

Zhenju ZHOU1,2(),Yanjing CHEN2,Haoshu TANG3,Yanshuang WU4,Zhengle CHEN1   

  1. 1 Institute of Geomechanics,Chinese Academy of Geological Sciences,Beijing 100081,China
    2 Key Laboratory of Orogen and Crustal Evolution,Peking University,Beijing 100871,China
    3 State Key Laboratory of Ore Deposit Geochemistry,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang 550002,Guizhou,China
    4 Xinjiang Research Center for Mineral Resources,Xinjiang Institute of Ecology and Geography,Chinese Academy of Sciences,Urumqi 830011,Xinjiang,China
  • Received:2018-05-04 Revised:2018-07-10 Online:2018-10-10 Published:2018-10-17

Abstract:

Zankan iron deposit is a recently discovered large iron deposit in the Taxkorgan terrane of the west Kunlun Orogen.The deposit is hosted in the metamorphosed volcanic and sedimentary rocks of the Bulunkuole Complex.The orebodies are stratiform or stratoid.The ores are uniquely composed of magnetite,pyrite and anhydrite at various ratios,and show banded,disseminated and massive structures.This paper reports Sr and Nd isotopic composition of ores and ore-hosting rocks of Bulunkuole Group to constrain sources of ore-forming material.The ores yieldI Srof 0.7100~0.7111,with an average of 0.7103;(143Nd/144Nd) i of 0.511555~0.512223,with an average of 0.511827.The biotite-quartz schists of Bulunkuole Group yield(143Nd/144Nd) i of 0.511552.The Sr-Nd isotope systematic shows a source of mixing crust and mantle.Therefore,it is concluded that the ore-forming materials mainly originated from volcanic rocks in the Bulunkuole Complex,and Zankan iron deposit was formed from an Early Cambrian seafloor hydrothermal system related to southward subduction of Proto-Tethyan plate.

Key words: Sr-Nd isotope, source of ore-forming materials, sulfide, ore, Bulunkuole group, Zankan iron deposit, Taxkorgan, west Kunlun Orogen

CLC Number: 

  • P618.31

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Table 1

Sr isotope composition of metal sulfides from Zankan iron deposit"

样品编号 样品名称 测试对象 Rb/(×10-6 Sr/(×10-6 87Rb/86Sr 87Sr/86Sr I sr(536 Ma)
ZK10-293 磁铁矿矿石 黄铁矿 0.12 1.33 0.2556 0.712000 0.7100
ZK10-359 磁铁矿矿石 黄铁矿 0.14 0.82 0.4828 0.714769 0.7111
ZKPM11-2 磁铁矿矿石 黄铁矿 0.09 2.18 0.1208 0.710982 0.7101
ZKPM11-4 磁铁矿矿石 黄铁矿 0.23 7.67 0.0870 0.710668 0.7100
平均值(n=4) 0.7103
布伦阔勒群
ZK10-397 黑云母石英片岩 磁黄铁矿 0.40 0.53 2.2202 0.714251 0.6973

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Table 2

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样品编号 样品名称 测试对象 Sm/(×10-6 Nd/(×10-6 147Sm/144Nd 143Nd/144Nd 143Nd/144Nd) i εNd(536 Ma)
ZK10-293 磁铁矿矿石 黄铁矿 0.24 1.32 0.1096 0.512088 0.511703 -4.8
ZKPM11-4 磁铁矿矿石 黄铁矿 0.93 4.36 0.1291 0.512676 0.512223 5.4
ZKPM11-2 磁铁矿矿石 黄铁矿 0.16 1.05 0.0918 0.511877 0.511555 -7.7
平均值(n=3) 0.511827 -2.4
布伦阔勒群
ZK10-397 黑云母石英片岩 磁黄铁矿 0.13 0.70 0.1078 0.511931 0.511552 -7.7

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