| 西藏墨竹工卡县甲玛矿区筒状矿体的发现及其地质意义 |
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| 引用本文：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.2011.Discovery of the tubular ore body in Jiama ore district, Tibet and its geological significance[J].Mineral Deposits,30(2):207~218 |
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| 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 |
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| 中文摘要:甲玛铜多金属矿床是冈底斯成矿带内与斑岩成矿作用有关的斑岩-矽卡岩型矿床。通过对甲玛矿区16号、32号勘探线剖面上主成矿元素以及其他常微量元素矿化分布规律的分析，指出在16线ZK1620～ZK1618之间存在筒状钼铜矿体，其角岩中矿体最大厚度491.38 m，铜平均品位0.21%，钼平均品位0.046%，矿化中心位于ZK1616附近；同时，在林布宗组与多底沟组层间构造带中产出巨厚的矽卡岩型铜钼（金银）多金属矿体，矿体厚度最大达252.2 m，铜平均品位0.75%，钼平均品位0.10%，金平均品位0.24 g/t，银平均品位12.26 g/t。在32线ZK3212～ZK3220范围内也存在筒状钼铜矿体，角岩型矿体最大厚度826 m，铜平均品位0.24%，钼平均品位0.054%，矿化中心位于ZK3216附近；角岩矿体下部为矽卡岩型铜钼（金银）多金属矿体，矿体最厚处超过127.9 m，铜平均品位0.72%，钼平均品位0.053%，金平均品位0.11g/t，银平均品位7.02 g/t。研究表明，甲玛铜多金属矿存在一个以ZK1616～ZK3216一带为矿化中心的筒状矿体（角岩+矽卡岩型矿体），在筒状矿体的深部可能存在隐伏含矿斑岩体。 |
| 中文关键词: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 |
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| Discovery of the tubular ore body in Jiama ore district, Tibet and its geological significance |
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| 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 molybdenum is about 0.046%. The mineralization center should be located near 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. |
| keywords:geology, tubular ore body, very thick layered skarn, metallogenic series of ore deposits, porphyry-skarn-hornfels type ore body, Jiama copper-polymetallic deposit |
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