摘要
东昆仑西段(祁曼塔格)的野马泉地区,是青海省内一个重要的多金属成矿区。该区以往的工作程度较低,与花岗岩有关的铁、铜、多金属矿床多是近几年地质大调查中新发现的。本文通过对野马泉地区铁、铜、多金属矿床矿石矿物组合、围岩蚀变分带、黄铁矿Co/N i比值、矿石稀土元素特征、矿床硫、铅同位素组成特征等的研究。结果表明,野马泉地区矽卡岩型多金属矿床的形成与东昆仑晚古生代-早中生代构造岩浆旋回造山后期的伸展引张环境形成的碱性A型花岗岩有关,成矿物质主要来自岩浆,具有深部来源特征,与幔源基性岩浆底侵及其与壳源酸性岩浆的混合作用有关,属于典型的钙、镁矽卡岩型矿床。
Yemaquan region in westem part of the East Kunlun Range （the Qimantage） is one of the important polymetallogenic districts in Qinghai Province. Many granitoid-related iron, copper and polymetallic deposits and occurrences have newly been discovered during the recent regional geological investigations. This paper studies mineral assemblage, Co/Ni ratios of pyrites, REE and S, Pb isotopic compositions, as well as rock alteration zoning of the iron, copper and polymetallic deposits in Yemaquan region. The results indicate that the skarn-type polymetallogenic deposits in the studied area are related with the alkalic A-type granite, which was formed in lithospheric extensional tectonic setting during the late stage of late Paleozoicearly Mesozoic tectonomagmatic cycle. These deposits of which contains the ore-forming materials with the deep derived characters were mainly from the magma, they are relative to the mixing between underplating mantle-derived basic magma and crust-derived acidic magma, and belong to the typical Ca, Mg skarn-type deposits.
出处
《华南地质与矿产》
CAS
2006年第3期31-36,共6页
Geology and Mineral Resources of South China
基金
青海省东昆仑野马泉-乌兰珠尔金属矿床成矿规律研究
