摘要
粤东锡多金属矿床硫同位素具有两个显著特征，即共生硫化物间硫同位素的不平衡性和东西矿带硫同位素的差异性。前者是由不同来源的硫的混合引起的，后者则可归因于主要硫源的差异。成矿流体氢、氧同位素复杂多变，既不同于该区初始花岗岩浆水的同位素组成，也不完全同于区内中生代大气降水的氢、氧同位奈组成，显示共是混合成因的。混合的端员流体是再平衡的岩浆水和再平衡的大气降水。
The tin-polymetallic deposits in eastern Giiangdong occiir afong two NNE-stretchizig fault belts, formizig two metallogenic belts, namely the eastern andtlie western belt. Sulfiir isotopic coniposition of the deposits in the eastern beltis higher than zero, suggestizig the derivation of sulfiir mainly from thegranitoids. On the contrary, sulfur isotopic composition of the deposits inthe western belt is lower than zero, indicating that sulfur was mainly derivedfrom sedimentary rocks. Sulfiir isotopes of coexisting sulfide minerals in most ofthese deposits are not in equilibriuni. Hydrogen and oxygen isotopic compositionof ore-forming fluids varies greatly and is different both from the compositionof the local initial magmatic water and from that of the local Mesozic meteoricwater. It has been inferred from these facts that the fluids are mixed ones,with the end-member fluids including the reequilibrium magmatic waterwhich interacted and exchanged hydrogen and oxygen isotol)es with localgranitoids and the reequilibrium Mesozoic meteoric water wliich interactedand exchanged hydrogen and oxygen isotopes with local granitoi'ds or sedimentaryrocks. The mixing of the two types of reequilibrium fluids accounts for thenonequilibrium of sulfur isotopes between coexisting minerals in the deposits.
出处
《矿床地质》
CAS
CSCD
北大核心
1994年第4期322-330,共9页
Mineral Deposits
关键词
锡
多金属矿床
稳定同位素
地球化学
eastern GuangdoWir, tinpolymetallic deposit, sulfur, hydrogen andoxygen isotopes
