矿床地质2011，Vol.30Issue(2)：207-218,12.
西藏墨竹工卡县甲玛矿区筒状矿体的发现及其地质意义
Discovery of the tubular ore body in Jiama ore district, Tibet and its geological significance
摘要
Abstract
The Jiama polymetallic copper deposit in Tibet is a porphyry-skarn type ore deposit related to ore-forming process of porphyry. According to the analysis of main ore-forming elements, mineralization distribution regularities of major elements and trace elements along the profile of No. 16 and No. 32 exploration lines, this paper indicates that there exists a tubular molybdenum-copper ore body between ZK1620 and ZK1618 of No. 16 exploration line. The maximum thickness of the hornfels ore body is 491.38 m, the average grade of copper is 0.21％, and the average grade of molybdenurn is about 0.046％. The mineralization center should be locatednear ZK1616. The very thick skarn type copper-molybdenum (gold and silver) polymetallic ore body is distributed in the expansion space between layers of J3d and K1l. Its maximum thickness is 252.2 m, and the average grade of copper is 0.75 ％, that of molybdenum is about 0.10 ％, that of gold is about 0.24 g/t, and that of silver is about 12.26 g/t. What' s more, there is a tubular molybdenum-copper body between ZK3212 and ZK3220 of No. 32 exploration line. The maximum thickness of the hornfels ore body is 826 m, with the average grade of copper being 0.24 ％ and that of molybdenum being about 0.054 ％. The mineralization center should be situated near ZK3216. Beneath the hornfels ore body there is a very thick skarn type copper-molybdenum (gold and silver) polymetallic ore body, whose maximum thickness is more than 127.9 m, and whose copper average grade is 0.72 ％, molybdenum average grade is about 0.053 ％, gold average grade is about 0.11 g/t and silver average grade is about 7.02 g/t. The Jiama copper-polymetallic ore deposit has a tubular ore body (hornfels + skarn type ore body), with the area of ZK1616～ZK3216 being the mineralization center. Whether there exists an ore-bearing porphyry body beneath the tubular ore body is an important subject in further research work.关键词
地质学/筒状矿体/巨厚层状矽卡岩/矿床成矿系列/斑岩-矽卡岩-角岩型矿体/甲玛铜多金属矿床Key words
geology/ tubular ore body/ very thick layered skarn/ metallogenic series of ore deposits/ porphyry-skarn-hornfels type ore body/ Jiama copper-polymetallic deposit分类
社会科学引用本文复制引用
郑文宝,陈毓川,唐菊兴,畅哲生,汪雄武,应立娟,黎枫佶,王焕,唐晓倩..西藏墨竹工卡县甲玛矿区筒状矿体的发现及其地质意义[J].矿床地质,2011,30(2):207-218,12.基金项目
本文得到国家973项目(2011CB403103)、中央公益性行业科研专项(200911007-02)、国家科技支撑项目(2006BAB01A01)、青藏专项(1212010818089)和技术开发项目(E0804)共同资助 （2011CB403103）
