摘要
从1999年至今,在库尔良地区中上石炭统库尔良群中发现了基性岩带.该岩带位于北昆仑晚古生代沟弧系内的阿巴勒克—托满一带,岩带长达40km.岩体侵入于库尔良群基性火山岩、陆源碎屑岩、碳酸盐岩中,呈岩墙产出.共圈出4条基性岩体.岩体长度1500～8000m,宽度20～800m,面积0.08～4.80km2.岩石SiO2为44.90%～50.04%,FeO、MgO含量较高.据矿物组合及含量应为辉长岩,属铁质基性岩.辉长岩MORB标准化蛛网图总体为向右倾斜的分布曲线(Sr除外);辉长岩稀土元素球粒陨石分布型式与球粒陨石分布型式相似,为右倾型,属轻稀土富集型.硫同位素正向偏向陨石硫.铅同位素相对稳定,组成比较均一,说明岩体岩石铅同位素属于稳定均匀类型.将样品投在显生宙铅同位素演化动力模式图上,均落于壳幔混合的造山带演化曲线附近.岩体形成时代为中二叠世或以后.岩体中已发现的铜矿(化)体,铜矿体长度1200m,厚度2.5～8.6m,Cu品位0.27%～1.53%,平均品位0.70%,伴生铂、钯.激电剖面在含矿地段有明显的异常显示,呈现高极化、低阻值特征.岩体这些特征反映出该区是寻找铜镍硫化物矿床的有利地区.
Some basic magmatic belts were found in middle-upper Carboniferous Kuerliang Group in the Kuerliang district, north of Kunlun Mountains. These basic rocks were hosted by dike in basic volcanic rocks, clastic and carbonate rocks. The chemical and mineral analysis indicates that the basic rock is of gabbro. MORB-normalized trace elements distribution patterns and Chondrite-normalized REE distribution pattern of gabbro show characters of right-slope. The sulfur and lead isotopic analysis indicate that δ34S composition is close to meteorolite value and lead isotopic composition is uniform, which fall near orogen line on Pb isotopic dynanlic evolutional model. Some Cu orebodies were discovered in these basic dikes, with Pt and Pd mineralization. Our geological survey indicates that the basic rocks is favorable to searching Cu-Ni mineralization.
出处
《新疆地质》
CAS
CSCD
2007年第1期18-25,共8页
Xinjiang Geology
基金
新疆皮山县托特块尔-托满铜矿资源调查评价(200310200026)项目
新疆西昆仑叶尔羌河地区矿产资源综合评价(200010200159)项目
新疆维吾尔自治区西昆仑叶尔羌河上游1:50万区域化探(J6.1-05-1)项目共同资助
关键词
北昆仑
基性岩
发现
找矿意义
northern Kunlun Mountains
basic rock
discovery
mineral prospecting
