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
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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。
Layikeleke iron—copper deposit is a high grade deposit which is recently discovered in coverage area of Qiongheba area in east Junggar,Xinjiang autonomous region.The content of TFe in the ore body is in an average of 51%,Cu over 1%,and associated with gold.The deposit characteristics are shallow,high grade and high economic value.Through the analysis of 1∶50000 ground gravity,magnetic and IP data,the large scale integrated geophysical exploration has carried out in this area.A high magnetic,high density and middle—high chargeability body was confirmed under the Quaternary cover.Then a concealed skarn ore body under the Quaternary was discovered by drilling in the geophysical anomaly zone.The ore body which has a thickness of 8 to32m and length more than 200m is located in the fracture of the lower Devonian volcanic rocks.the wall rock alteration developed,from inner(ore body)to outer-side(wall rock)are Skarn lithification,epidotization and actinolite alteration zoning.The metallic mineral are magnetite and chalcopyrite,and the gangue minerals are mainly hedenbergite,diopside—salite,etc.The characteristics of the occurrence of ore body and the ore mineral composition show that the ore body is Skarn type.But unlike the normal skarn deposits,there are no carbonate rock and pluton around the ore body and no contact metasomatic environment.Base these information,we believed that the deposit was formed in the processing of crystal fractionation and replacement,when the skarn magma from deep intrudes into the tectonic fractures in shallow crust.
Layikeleke iron—copper deposit is a high grade deposit which is recently discovered in coverage area of Qiongheba area in east Junggar,Xinjiang autonomous region.The content of TFe in the ore body is in an average of 51%,Cu over 1%,and associated with gold.The deposit characteristics are shallow,high grade and high economic value.Through the analysis of 1∶50000 ground gravity,magnetic and IP data,the large scale integrated geophysical exploration has carried out in this area.A high magnetic,high density and middle—high chargeability body was confirmed under the Quaternary cover.Then a concealed skarn ore body under the Quaternary was discovered by drilling in the geophysical anomaly zone.The ore body which has a thickness of 8 to32m and length more than 200m is located in the fracture of the lower Devonian volcanic rocks.the wall rock alteration developed,from inner(ore body)to outer-side(wall rock)are Skarn lithification,epidotization and actinolite alteration zoning.The metallic mineral are magnetite and chalcopyrite,and the gangue minerals are mainly hedenbergite,diopside—salite,etc.The characteristics of the occurrence of ore body and the ore mineral composition show that the ore body is Skarn type.But unlike the normal skarn deposits,there are no carbonate rock and pluton around the ore body and no contact metasomatic environment.Base these information,we believed that the deposit was formed in the processing of crystal fractionation and replacement,when the skarn magma from deep intrudes into the tectonic fractures in shallow crust.
引文
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