摘要
新疆托库孜巴依金矿床的地质、地球化学特征以及同位素年龄,氢、氧、硫等同位素测试和流体包裹体研究表明,该矿床经历了热液成矿期和地表氧化期2个成矿期,工业矿体主要富集在热液期的金-硫化物-碲化物-石英阶段。含矿石英脉中黄铁矿的δ(34S)值与围岩硫特征基本相符,具上地幔源δ(34S)分布特征。石英中包裹体氢氧同位素组成落于大气降水线之下,在变质水、岩浆水下部边缘,具混源特征。铅同位素组成落在上地幔和造山带增长线之间偏造山带侧。成矿流体气相成分以水为主,CO2、CO成分很少,液相离子成分以Ca2+,Na+,K+,HCO3-,SO24-为主。流体包裹体的盐度为6.00%～9.44%,密度为0.763～0.922g/cm3。均一温度为275～324,207～273,207～218,191～222℃。托库孜巴依金矿床属于韧性剪切带型金矿床。构造变形作用促使流体萃取了阿勒泰组上亚组第二岩性段变质火山岩或火山沉积岩中的成矿元素,导致金元素在有利的空间形成含金石英脉,后期岩浆侵入活动为金的进一步富集提供了热源和流体。
In order to understand the genesis of Tuokuzibayi gold deposit,a study is made of the geological characteristics of the deposits and its geochemistry feature. The results show that the economical ore body mainly consists of the gold-sulfides-telluride-quartz vein.δ34S of the pyrite from ore containing quartz veins is similar to that in the country rock,with the same distribution as those of upper mantle. δ18O and δD of the fluid show that ore fluids mainly came from metioric water,and mixed with alterated fluid and magmatic fluid. Lead isotope compositon reveals that lead located at the area between upper mantle and orogenic belt growing line and near the latter one. Ore-forming fluid is mainly composed of water and some ions such as Ca2＋,Na＋,K＋,HCO-3,SO2-4,with little CO2 and CO. Fluid inclusions＇ temperature shows that there are four stages：278-324,207-273,207-218,191-222℃,corresponding to different ore-forming stages. While the salinity and density of ore-forming fluid are 6.00%-9.44% and 0.763-0.922 g/cm3 respectively. Tuokuzibayi gold deposit is a ductile shear belt type gold deposit. Structure deformation caused fluid to extract gold from the second member of Aletai Formation consisting of metamorphosed volcanic rocks or unmetamorphosed volcanic rocks. Then it precipitated in the quartz vein at favourable space. Later igneous rocks emplacement provided heat energy and fluid,which may have led to the gold enrichment.
出处
《地质科技情报》
CAS
CSCD
北大核心
2010年第2期123-129,共7页
Geological Science and Technology Information
关键词
金矿床
韧性剪切带
成因
托库孜巴依
新疆
gold deposit
ductile shear belt
ore genesis
Tuokuzibayi
Xinjiang
