西北地质
西北地質
서북지질
Northwestern Geology
2015年
4期
148-159
,共12页
钨矿床%地质特征%控矿因素%北祁连西段%中国西部
鎢礦床%地質特徵%控礦因素%北祁連西段%中國西部
오광상%지질특정%공광인소%북기련서단%중국서부
tungsten deposits%geological characteristics%Ore-controlling factors%western seg-ment of North Qilian Mountains%Western China
北祁连西段达到大型规模的钨矿床有3处，分别是塔儿沟钨矿、小柳沟钨矿和西柳沟钨矿，空间上自西向东展布；其地质特征各有特点，成矿条件也不尽相同。通过对3个矿床地质特征的对比和成矿条件的分析，认为北祁连西段钨矿是加里东期的产物，初始矿源来自元古界古老地层，构造控制矿体数量、产状和规模，酸性花岗质岩体侵入热液作用使 W 元素富集最终成矿，成矿期从中奥陶世延续到晚志留世。塔儿沟钨矿和小柳沟钨矿成矿在“板块俯冲”时形成，西柳沟钨矿在“陆陆碰撞”时形成。北祁连西段具有良好的钨矿成矿背景和有利的成矿条件，矿床外围地质工作程度低，在其外围和深部开展工作，找矿会有重大突破，勘查方法以钻探为主。
北祁連西段達到大型規模的鎢礦床有3處，分彆是塔兒溝鎢礦、小柳溝鎢礦和西柳溝鎢礦，空間上自西嚮東展佈；其地質特徵各有特點，成礦條件也不儘相同。通過對3箇礦床地質特徵的對比和成礦條件的分析，認為北祁連西段鎢礦是加裏東期的產物，初始礦源來自元古界古老地層，構造控製礦體數量、產狀和規模，痠性花崗質巖體侵入熱液作用使 W 元素富集最終成礦，成礦期從中奧陶世延續到晚誌留世。塔兒溝鎢礦和小柳溝鎢礦成礦在“闆塊俯遲”時形成，西柳溝鎢礦在“陸陸踫撞”時形成。北祁連西段具有良好的鎢礦成礦揹景和有利的成礦條件，礦床外圍地質工作程度低，在其外圍和深部開展工作，找礦會有重大突破，勘查方法以鑽探為主。
북기련서단체도대형규모적오광상유3처，분별시탑인구오광、소류구오광화서류구오광，공간상자서향동전포；기지질특정각유특점，성광조건야불진상동。통과대3개광상지질특정적대비화성광조건적분석，인위북기련서단오광시가리동기적산물，초시광원래자원고계고로지층，구조공제광체수량、산상화규모，산성화강질암체침입열액작용사 W 원소부집최종성광，성광기종중오도세연속도만지류세。탑인구오광화소류구오광성광재“판괴부충”시형성，서류구오광재“륙륙팽당”시형성。북기련서단구유량호적오광성광배경화유리적성광조건，광상외위지질공작정도저，재기외위화심부개전공작，조광회유중대돌파，감사방법이찬탐위주。
There arethree large scale tungsten deposits in the western segment of North Qilian Mountains,Northwest China,including Taergou ,Xiaoliugou and Xiliugoudeposits from west to east on space. They have their own characteristics in geological features,with totally different metallogenic con-ditions. After comparing geological characteristics of these tungsten deposits and analyzing their metallo-genic conditions,these deposits were thought to be the production of Caledonian Period.The initial W was sourced from the proterozoic old strata,the quantity,occurrence state and size of tungsten ore body are strictly controlled by geological structure,and the tungsten concentrated and enriched to be form the ore bodies by magmatic hydrothermal process of acidic granite intrusion. The main mineralization was lasted from Middle Ordovicianto Ludlow Silurian. The Tergou and Xiaoliugou tungsten deposits are formed during the “plate subduction”,while the Xiliugou tungsten deposit is formed in the “continent-continent collision”. The western segment of North Qilian Mountains has a good background of tung-sten mineralization and favorable conditions for mineralization.Due to the low degree of geological works had been done in the peripherals of these deposits,a great break through will be obtain when the geolog-ical works (the main exploration method will be drilling)can be carried out in their peripherals and deep parts.
