【摘要】 通过电子探针背反射图像(BSE)和能谱(ES)分析,结合岩矿鉴定和前人研究资料,确定大岩子PGE矿床与矿化有关的主要是一套低温矿物组合。与成矿特征相似的New Rambler Mine矿床进行了对比,并综合前人有关PGE低温成矿的论述和实验研究,认为大岩子PGE矿床具有明显的低温成矿特征,其成矿温度低于300℃,经历了富S体系溶液下的富集成矿和紧随其后的富Cl体系溶液下活化再富集成矿两个过程,后期矿化可能相当于或者强于前期矿化。更多还原

【Abstract】 According to BSE and ES microanalyses,rock-mineral identification and geologic records of the Dayanzi PGE deposit,the authors have confirmed that a set of low-temperature mineral assemblages is associated with PGE mineralization.Based on the above result,a comparison between the Dayanzi deposit and the New Rambler Mine deposit was made,in combination with previous explanations and experiments on PGE mineralization at low temperatures,the authors held that the Dayanzi PGE deposit is characteristic of low-temperature mineralization;its mineralization temperature is lower than 300 ℃,and it experienced the processes of concentration and deposition in aqueous H₂S-rich solutions and subsequent activation,and the processes of concentration and deposition in aqueous Cl-rich solutions.The records suggest that the latter process may be equal to or greater than the former process.更多还原