新疆吐哈盆地南缘东戈壁巨大型钼矿床控矿地质条件分析  

ANALYSIS ON ORE CONTROLLING GEOLOGICAL CONDITION OF LARGE-SCALE MOLYBDENUM DEPOSIT IN EAST GOBI NEAR SOUTHERN TUHA BASIN IN XINJIANG

作　　者：付恒一[1] 汪慧军[1] 董理践[1] 王璇 FU Heng-yi;WANG Hui-jun;DONG Li-jian;WANG Xuan(The Second Geological Prospecting Institute,Henan Bureau of Geo-exploration＆mineral Development,Zhengzhou 450000,Henan,China)

机构地区：[1]河南省地质矿产勘查开发局第二地质勘查院,河南郑州450000

出　　处：《中国钼业》2018年第5期21-26,共6页China Molybdenum Industry

摘　　要：新疆吐哈盆地南缘东戈壁巨大型钼矿床是自治区钼多金属地质找矿的重大突破。梳理矿床的控矿地质条件可以发现:(1)矿区位于塔里木—敦煌板块向吐哈板块俯冲的对接带上;(2)在深大断裂切割的断块边缘,区域断裂构造较发育,从而造成地壳的软弱地带,有利于地幔柱的上侵和演化;(3)矿床全部产于古生界石炭系干敦组下段地层中;(4)赋矿岩石为一套陆源碎屑岩,具体岩性为变质砂岩、变质砂质泥岩及变质泥质砂岩;(5)岩体控矿:地下深部隐伏的花岗斑岩岩体分布地段即为主要工业矿体的分布地段,岩控特征十分清楚;(6)年代控矿:东戈壁成矿母岩—花岗斑岩锆石U-Pb同位素SHRIMP法测年年龄为(227±1. 3) Ma,系古生代二叠纪末期侵入体。总而言之,斑岩型钼矿床系一系列控矿地质条件在一个成矿系统内各种条件综合作用的产物。Large-scale molybdenum deposit,located in East Gobi near Southern Tuha Basin in Xinjiang,is a major breakthrough of Mo-Polymetal geological prospecting. Analyzing the ore controlling geological condition,it can be found as follows：（1） Ore district is on the subduction zone between Tarim-Dunhuang Plate and Tuha Plate;（2） At the margin of fault block which cut by discordogenic fault,regional faults are more developed,causing the weak zone of crust and the rising and evolution of mantle plume.;（3） This deposit occurs in lower bench of Palaeozoic Carboniferous system Gandun formation.;（4） The host rock is terrigenous clastic rock and rock characters are metasandstone,metamorphic arenaceous mud stone and metamorphic argillaceous sandstone;（5） Rock-controlling：it＇s clear that in the deep earth,where granite-porphyry exist,there are industrial ore body.（6） Time-controlling：the metallogenic mother rock,granite-porphyry acorite,SHRIMP lead age of U-Pb isotopic element is（ 227 ±1. 3） Ma. It＇s the intrusion in last phase of Paleozoic Permian period. In the summary,the ore controlling geological condition of porphyry-type molybdenum deposit is a integrated product of multiple factors in metallogenic systems.

关 键 词：深大断裂 地幔柱 石炭系 变质碎屑岩 花岗斑岩 SHRIMP法 岩体侵入年代 吐哈盆地 

分 类 号：TD146.2[矿业工程—矿山地质测量]