【摘要】 研究清岩沟镍-钼矿床地球化学特征,结果表明:含矿岩石主量元素以Si,Al,Ca,Mg为主,富含Mo,Ni,Ti,Cu,Pb,Zn,P及碳质等.铂族元素丰度介于地壳和地幔间,稀土元素在各岩石中含量较大,具铕正异常,铈异常不明显,轻稀土相对于重稀土富集.据氢氧同位素及地质特征,认为成矿流体为遭强烈改造的大气降水,混有变质热液及少量岩浆水.早中期含镍矿化石英脉原生包裹体均一温度为211.4℃~444.9℃,成矿温度属中-高温,盐度7.02%~19.21%.辉钼矿与石墨化关系密切,为高温成矿阶段产物.Mo,Ni等成矿元素在沉积期形成后,经区域变质变形,后期强韧-脆性剪切构造作用叠加、改造,在有机质及产生的烃类参与下,Mo,Ni元素发生迁移、沉淀,形成硫化物型镍、钼矿(化)体.更多还原

【Abstract】 This paper deals with geochemistry of the Qingyangou Ni-Mo deposit on the basis of the field work.The results indicate:①The contents of Mo,Ni,Ti,Cu,Pb,Zn,P and TOC are rich in the orebearing rocks.②The abundances of platinum group elements related to that of crust and mantle.③There exist greatly difference in the contents of Ree elements in rocks;The samples are characterized by the slight negative or positive Ce anomalies,and distinct positive Eu anomalies,L-Ree is enrichment relative to H-Ree.④The character of hydrogen-oxygen isotope and geology shows that mineralizing fluid was made up of reconstructive intensively meteoric water,metamorphic fluid and little magmaticwater.⑤The homogenization temperature of primary inclusion in the quartz vein with Ni mineralization forming at the fore-middle stage is from 211.4℃ to 444.9℃(middle-to-high minerogenic temperature),and salinity(NaCleq) is from 7.02% to 19.21%;The molybdenite formed in high temperature because of it’s direct relation with graphitization.Accordingly,we consider: The rocks has experienced regional metamorphism after the formation of Ni,Mo elements by the sedimentary,the shearing tectonic process of brittle-ductile superposition and transformation in later period.In course of it,organic matter and relational?hydrocarbon play an important role.Because of this experience,Mo and Ni were migration and precipitation.Finally,they host in schistosity zone or the contact between ductile bodies and rigid bodies,where has undergone tectonic prcess strongly.更多还原