内蒙古兴和曹四夭超大型钼矿床地质特征及找矿标志分析  

GEOLOGICAL CHARACTERISTICS AND PROSPECTING INDICATORS ANALYSIS OF CAOSIYAO SUPER LARGE MO MINERAL DEPOSIT IN XINGHE,INNER MONGOLIA

作　　者：李战明[1] 魏振伟[1] 师书冉[1] 吴飞[1] 陈晓龙[1] 付治国[1] 

机构地区：[1]河南省地质矿产勘查开发局第二地质勘查院,河南许昌461000

出　　处：《中国钼业》2014年第1期26-31,共6页China Molybdenum Industry

摘　　要：内蒙古自治区兴和县曹四夭钼矿床,是新近发现并探明的我国又一超大型钼矿床。赋矿地层为中太古界集宁岩群黄土窑岩组,岩性为一套片麻岩类及浅粒岩类;矿床成矿母岩为中生代燕山期白垩纪花岗斑岩微型岩株,其SiO2含量达76.35%,为强酸性岩石,具高钾高碱性质;稀土特征为重稀土散失,轻稀土富集,强负铕异常。花岗斑岩SHRIMP法U-Pb同位素等时线年龄为(137±12)Ma,属早白垩纪。矿区1∶5万水系沉积物与成矿有关的乙-甲1-W、Mo、Bi、Au、Sn、As、Sb综合异常,1∶1万土壤1-甲1、3-甲1两个多金属异常与其相套合,多金属组合亦相似,为良好的找矿标志。主要工业矿体呈大型透镜体,为巨厚块体,矿体结构简单,与深部花岗斑岩体顶面起伏形态为"整合"关系。矿床成因类型为斑岩型钼矿床;除地球化学特征外,成矿母岩体及矿化蚀变带亦是矿产勘查工作中的重要找矿标志。The Caosiyao Mo mineral deposit in Xinghe County, Inner Mongolia autonomous region, is another super large Mo mineral deposit, which was discovered and proved recently. The ore -bearing stratum is Huangtuyao For- mation, Jining Group, Mesoarchean Era, which consists of a set of gneiss and leucoleptite rocks ; the mini granitic porphyry stocks are ore parent rocks, yanshan period, Mesozoic, Strongly acidic rocks, high -alkaline and high - potassium, where the content of SiO2 is 76.35% ; the rare earth character are loss of heavy rare earth, enrichment of light rare earth elements, strong negative Eu anomaly. The U - Pb isochron age is 137 _＋ 12 Ma in the isotopic method of granitic porphyry SHRIMP, which belongs to early cretaceous. The mining ore - related B - A 1 - W, Mo, Bi, Au, Sn, As, Sb in 1：50 000 stream sediment are composite anomalies, there with fitting two polymetallic anomalies, 1 - A 1, 3 - A 2 in 1 ： 10 000 Soil, multi -metal combinations are similar, which are good prospecting indicators. Major industrial ore body are large lens with ultra -thick blocks, simple ore structure, ＂conform- ably＂ contact with top surface of deep granitic porphyry, whose morphology are ups and downs. The genetic type is porphyry mo mineral deposit; apart from the geochemistry characters, the ore parent rocks and mineralization alteration zones are also important prospecting indicators in mineral exploration.

关 键 词：超大型钼矿床 赋矿地层 成矿母岩 地球化学综合异常 找矿标志 

分 类 号：TD164.2[矿业工程—矿山地质测量]