新疆东准噶尔拉伊克勒克岩浆矽卡岩型富铜——铁矿的发现及其成矿特征

发布时间：2018-05-26 05:17

本文选题：岩浆矽卡岩 + 富铜—铁矿床　；参考：《地质论评》2017年02期

【摘要】：拉伊克勒克铜铁矿是最近在新疆东准噶尔琼河坝覆盖区发现的高品位矿床,矿体中TFe平均达51%,Cu含量在1%以上,并伴生Au,具有埋藏浅、品位高的特点,经济价值较高。该矿的发现首先是通过1∶5万地面重力、磁力和激电资料的处理分析,优选出找矿靶区;然后开展大比例尺的综合地球物理探测,发现在第四系覆盖区下存在高磁、高密度和中高极化率复合异常体;在异常有利地段实施钻探,首钻在揭穿第四系后即发现厚大隐伏矽卡岩型铜铁富矿体;通过7个钻孔的控制,求得铁资源量2.45Mt,铜资源量44 kt。矿体主体产于泥盆系下统安山岩和凝灰岩的层间构造裂隙中,厚度8~32m,长度大于200m。矿体两侧围岩蚀变发育,从内到外形成透辉石化、绿帘石化和角闪石、阳起石的蚀变分带。矿石中金属矿物主要是磁铁矿和黄铜矿,脉石矿物主要为钙铁榴石、透辉石—次透辉石等。矿体产状、矿石矿物组成、蚀变分带等特征表明,矿体类型为矽卡岩型,但是与一般接触交代矽卡岩矿床不同的是矿体周边未见碳酸岩与岩体,不存在接触交代的环境。综合分析认为该矿是一个典型的岩浆矽卡岩型矿床,其成因是深部形成的矽卡岩矿浆侵入到地壳浅部的构造裂隙中,在结晶分异和自交代过程中形成的。拉伊克勒克隐伏富铜—铁矿床及相邻斑岩型铜多金属矿床的发现说明综合地球物理在覆盖区找矿中能发挥重大作用,也扩大了在东准噶尔地区寻找矽卡岩型矿床的视野,同时也丰富了矽卡岩型铜铁矿的形成机理。
[Abstract]:Ray Klerk copper ore deposit is a high grade deposit found recently in Qiongheba overburden area of East Junggar, Xinjiang. The average TFe content of ore body is more than 51%, accompanied by Au. it has the characteristics of shallow burial, high grade and high economic value. The discovery of the mine was first made by processing and analyzing the data of 1: 50, 000 ground gravity, magnetic force and induced electricity, and then the prospecting targets were selected, and then comprehensive geophysical exploration on a large scale was carried out, and it was found that there was a high magnetic field in the Quaternary covering area. The complex anomaly bodies with high density and high polarizability were drilled in the favorable areas, and the thick and concealed skarn copper-iron rich bodies were found in the first drill after exposing the Quaternary, and the iron resources and copper resources were obtained by the control of seven boreholes and the amount of iron resources was 2.45 Mt and the amount of copper resources was 44 kt. The orebody mainly occurs in the interlayer structural fractures of the Lower Devonian andesite and tuff with a thickness of 832 m and a length of more than 200 m. The wall rock on both sides of the orebody is altered to form diopside zone from inside to outside, green curtain petrifaction, hornblende and actinolite. The main metal minerals in the ore are magnetite and chalcopyrite, while the gangue minerals are mainly calcium iron garnet, diopside-subdiopside and so on. The characteristics of ore body occurrence, mineral composition and alteration zoning indicate that the orebody type is skarn type, but unlike the general contact metasomatic skarn deposit, there is no carbonatite and rock mass around the orebody, and there is no contact metasomatism environment. It is considered that this ore deposit is a typical magmatic skarn type deposit, and its genesis is formed during the process of crystallization differentiation and self-metasomatism, in which the skarn magma formed in the deep layer intruded into the structural fissure in the shallow part of the crust and formed during the process of crystallization differentiation and self-metasomatism. The discovery of Ray Klerk concealed copper-rich iron deposit and adjacent porphyry copper polymetallic deposit shows that comprehensive geophysics can play an important role in prospecting in overlying area, and has also expanded the field of vision for skarn type deposits in East Junggar area. At the same time, it enriches the formation mechanism of skarn copper-iron ore.
【作者单位】：中国地质科学院矿产资源研究所国土资源部成矿作用与资源评价重点实验室;
【基金】：新疆维吾尔自治区地质勘查基金资助项目(编号:A11-3-XJ4) 国家自然科学基金资助项目(编号:41574133) 中国地质调查局地质项目(编号:121201103000150009,1212011085024,12120113041300)的成果~~
【分类号】：P618.41;P618.31

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