西藏冈底斯造山带西段铁铜多金属(金、银)成矿远景

综合近年来在西藏冈底斯地区地质与矿产勘查工作所取得的新成果,在对区域成矿地质背景和成矿条件进行初步分析与对比研究的基础上,指出冈底斯造山带西段的地质构造演化过程、成矿构造环境、与铜铁铅锌(金、银)成矿作用有关的花岗岩类岩体的成岩时代、岩石类型及其岩石化学和成矿元素含量方面均可与东段进行对比,显示西段同样具有巨大的找矿潜力和资源远景.区内的优势或潜在优势金属矿种是铜、铁、铅、锌和金(银).它们的成因类型主要是与中酸性岩浆侵入作用有关的矽卡岩型、斑岩型和热液型(包括破碎带蚀变岩型),其次为火山热液型.在总结区内已知矿床(点)成矿特征和进行区域成矿区(带)划分的基础上,优选出江巴复式花岗岩基的西缘等7个成矿远景区,并对各远景区提出了进一步勘查工作的建议.

METALLOGENETIC PERSPECTIVE OF COPPER-IRON POLYMETALLIC MINERALIZATION IN THE WESTERN SECTION OF GANGDISE OROGENIC BELT,TIBET

Having systematically summed up the progress in geological survey and exploration of mineral resources and analyzed the regional metallogenetic backgrounds and conditions,the authors discuss the process of tectonic evolution,metallogenetic geotectonic settings of the western section of Gangdise oregenic belt,Tibet.The correlation of mineralization ages,rock types,petrochemical characteristics and contents of metallic elements of granitoids related to mineralization in the western and eastern section of Gangdise orogenic belt,shows that the western area has great prospective potentiality for copper,iron,lead,zinc and gold(silver). Genetic types of ore deposits in this area mainly include skarn type,porphyry type,magmatic hydrothermal type related to intermediate-acidic intrusions,then the volcanic hydrothermal type. Besides,the study of the metallogenetic features of the explored deposits and mineralized spots and subdivision of metallogenetic belts in the studied area,has also suggested seven metallogenetic perspective areas (such as the western margin around the Jiangba granitic composite batholith)have been selected and the authors suggested for further exploration.