摘要
利用水/岩交换理论对西华山钨矿蚀变岩石氢氧同位素分析结果的研究,确认本区主要赋矿岩石(中粒黑云母花岗岩)经历了两次蚀变。一次为岩浆热液水的面型蚀变,另一次为大气降水热液叠加蚀变。前种蚀变形成的岩石中δ^(18)O 较原岩升高,δD 降低;后者形成的蚀变岩中δ^(18)O 降低,δD受控于高岭石和绢云母。西华山钨矿成矿以岩浆热液作用为主,大气降水对成矿的作用不大。
Based on the theory of water/rock interaction systematic sampling is carried out for hydrogen and oxygen isotope analysis of the altered rocks in Xihuashan tunsten ore deposit.This paper presents the results showing that the main hosting rock of medium-grained biotite granite undergoes at least two al- teration stages during which altered rocks are formed and systematic variation in hydrogen and oxygen isotopit composition takes place.The first stage is dominated by magma water and the altered rock of alkline-feldsparized granite is produced with higher oxygen ratio and lower hydrogen ratio than that of the medium-grained biotite granite.The second stage is characterized by the overprint of meteoric water on the first.The alkline-feldspar is kaolinized and sericitized resulting in argillic alteration.O-isotope ratio is lowered and H-isotope ratio is controlled by the formation of kaolinite and sericite.The authors emphasize that study of hydrogen and oxygen isotopes,both of the ore-forming fluids and the altered rocks is an effective approach to deal with genesis of ore deposits.
出处
《地质找矿论丛》
CAS
CSCD
1990年第4期69-79,共11页
Contributions to Geology and Mineral Resources Research
