东天山卡拉塔格一带月牙湾铜镍矿的发现及其地质意义
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摘要
新疆东天山月牙湾铜镍矿产于卡拉塔格矿集区西段,其与铜镍成矿关系密切的两个镁铁质杂岩体呈月牙状、环状小岩株产出于南北—北西向断裂构造带上,出露面积分别为0.53 km~2、0. 14 km~2。岩相分异明显,主要为橄榄辉长岩、辉石橄长岩、橄长岩、辉长岩、斜长岩、淡色辉长岩及少量苏长岩,属于钙碱性系列,具有同源多阶段连续演化侵位的特点。镁铁质杂岩体对应高重、高磁、高极化率及中低电阻率的"三高一低"综合物探异常特征,杂岩体范围内Cu、Ni、Co、Cr、Au、Ag元素综合异常明显。通过综合评价,初步圈定铜镍矿化体6个。矿体赋存于橄榄辉长岩-辉石橄长岩中,主要有浸染状—稠密浸染状和贯入的块状—脉状两种矿化类型,后者常构成富矿体。金属矿物主要为磁黄铁矿、黄铜矿、镍黄铁矿、黄铁矿及磁铁矿、钛铁矿。根据围岩接触关系和同位素定年结果限定了月牙湾岩浆型铜镍硫化物矿的成矿时代为早二叠世,与黄山—白鑫滩成矿带内的铜镍矿为同一时期产物。月牙湾岩浆型铜镍硫化物矿床的发现扩大了卡拉塔格及东天山地区铜镍找矿空间。
The Yueyawan Cu-Ni deposit is located at the western Kalatage area, Eastern Tianshan, NW China. Ore-bearing mafic complex related to the mineralization is composed of olivine gabbro, pyroxene troctolite, troctolite, gabbro, anorthosite, leucogabbro and some norite of calc-alkali series, and are formed by fractional crystallization of the same sourced magma. The mafic complex has geophysical anomalies of "three higher and one lower",i. e. higher gravity, higher magnetic force, higher polarizability and lower resistivity. What's more, geochemical anomalies of Cu, Ni, Co, Cr, Au, Ag are significant. By comprehensive evaluation, six Cu-Ni orebodies have been determined, and the deposit is evaluated to have prospect of medium-sized resources. The orebodies occur in the olivine gabbro and pyroxene troctolite, and sulfide occur in disseminated-dense disseminated and massive-veinlet ores, with the latter compose bonanza. Ore minerals comprise magnetopyrite, pentlandite, chalcopyrite, pyrite, magnetite and ilmenite. According to the relationship between complex and wall rocks, and isotopic dating results, we suggested that the Yueyawan Cu-Ni deposit was formed in the Early Permian, when the Cu-Ni deposits formed in the Huangshan-Baixintan metallogenic belt. The discovery of the Yueyawan Cu-Ni sulfide deposit extends the prospecting space for Cu-Ni sulfide deposits in Kalatage and Eastern Tianshan area.
The Yueyawan Cu-Ni deposit is located at the western Kalatage area, Eastern Tianshan, NW China. Ore-bearing mafic complex related to the mineralization is composed of olivine gabbro, pyroxene troctolite, troctolite, gabbro, anorthosite, leucogabbro and some norite of calc-alkali series, and are formed by fractional crystallization of the same sourced magma. The mafic complex has geophysical anomalies of "three higher and one lower",i. e. higher gravity, higher magnetic force, higher polarizability and lower resistivity. What's more, geochemical anomalies of Cu, Ni, Co, Cr, Au, Ag are significant. By comprehensive evaluation, six Cu-Ni orebodies have been determined, and the deposit is evaluated to have prospect of medium-sized resources. The orebodies occur in the olivine gabbro and pyroxene troctolite, and sulfide occur in disseminated-dense disseminated and massive-veinlet ores, with the latter compose bonanza. Ore minerals comprise magnetopyrite, pentlandite, chalcopyrite, pyrite, magnetite and ilmenite. According to the relationship between complex and wall rocks, and isotopic dating results, we suggested that the Yueyawan Cu-Ni deposit was formed in the Early Permian, when the Cu-Ni deposits formed in the Huangshan-Baixintan metallogenic belt. The discovery of the Yueyawan Cu-Ni sulfide deposit extends the prospecting space for Cu-Ni sulfide deposits in Kalatage and Eastern Tianshan area.
引文
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秦克章,方同辉,王书来,等.2001.吐哈盆地南缘古生代“天窗”卡拉塔格铜金矿化区的发现及其成矿潜力[J].中国地质,28(3):16-23.
秦克章,方同辉,王书来,等.2002.东天山板块构造分区、演化与成矿地质背景研究[J].新疆地质,20(4):302-308.
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王京彬,王玉往,何志军.2006.东天山大地构造演化的成矿示踪[J].中国地质,33(3):461-469.
王亚磊,张照伟,尤敏鑫,等.2015.东天山白鑫滩铜镍矿锆石U-Pb年代学、地球化学特征及对Ni-Cu找矿的启示[J].中国地质,42(3):452-467.
许英霞,秦克章,徐兴旺,等.2010.东天山卡拉塔格成矿带红山铜-金矿床S同位素特征及成矿潜力研究[J].西北地质,43(4):279-287.
杨万志,任燕,田江涛,等.2017.东天山路北铜镍矿的发现及其意义[J].矿物岩石地球化学通报,36(1):112-120.
(1)新疆东天山K46C002002(五堡幅)1:25万区域地质调查报告,2003
(2)新疆东天山中段有色金属基地综合调查2017年度进展报告,2017
(3)新疆哈密市卡拉塔格500高地铜镍矿调查评价成果报告,2018
方同辉,秦克章,王书来,等.2002.浅析卡拉塔格铜金矿成矿地质背景[J].矿床地质,21(增刊):380-384.
付明禄,许强奋,曾阳,等.2010.哈密黄土坡铜锌矿地质特征及找矿方法探讨[J].新疆地质,28(3):260-266.
李文铅,王冉,王核,等.2006.“吐哈天窗”卡拉塔格岩体的地球化学和岩石成因[J].中国地质,33(3):559-565.
李鑫,王敦科,赵树铭.2014.哈密白鑫滩岩浆型铜镍硫化物矿床的发现[J].新疆地质,32(3):466-469.
吕晓强,方同辉,孙燕.2016.东天山卡拉塔格地区铜多金属矿成矿地质特征浅析[J].矿产勘查,7(1):38-44.
毛启贵,方同辉,王京彬,等.2010.东天山卡拉塔格早古生代红海块状硫化物矿床精确定年及其地质意义[J].岩石学报,26(10):3017-3026.
毛启贵,王京彬,方同辉,等.2017.新疆东天山卡拉塔格地区中泥盆世玉带斑岩铜(金)矿发现的地质找矿意义[J].地质与勘探,53(1):1-11.
缪宇,秦克章,许英霞,等.2007.东天山卡拉塔格梅岭铜(金)矿床地质和流体包裹体特征及其与紫金山式铜金矿床的对比[J].矿床地质,26(1):79-88.
秦克章,方同辉,王书来,等.2001.吐哈盆地南缘古生代“天窗”卡拉塔格铜金矿化区的发现及其成矿潜力[J].中国地质,28(3):16-23.
秦克章,方同辉,王书来,等.2002.东天山板块构造分区、演化与成矿地质背景研究[J].新疆地质,20(4):302-308.
唐俊华,顾连兴,郑远川,等.2006.东天山卡拉塔格钠质火山岩岩石学、地球化学及成因[J].岩石学报,22(5):1150-1166.
王京彬,王玉往,何志军.2006.东天山大地构造演化的成矿示踪[J].中国地质,33(3):461-469.
王亚磊,张照伟,尤敏鑫,等.2015.东天山白鑫滩铜镍矿锆石U-Pb年代学、地球化学特征及对Ni-Cu找矿的启示[J].中国地质,42(3):452-467.
许英霞,秦克章,徐兴旺,等.2010.东天山卡拉塔格成矿带红山铜-金矿床S同位素特征及成矿潜力研究[J].西北地质,43(4):279-287.
杨万志,任燕,田江涛,等.2017.东天山路北铜镍矿的发现及其意义[J].矿物岩石地球化学通报,36(1):112-120.
(1)新疆东天山K46C002002(五堡幅)1:25万区域地质调查报告,2003
(2)新疆东天山中段有色金属基地综合调查2017年度进展报告,2017
(3)新疆哈密市卡拉塔格500高地铜镍矿调查评价成果报告,2018