摘要
长坑金银矿赋矿硅质岩的硅氧同位素地球化学特征及其成因意义孙晓明孙凯陈敬德陈炳辉(中山大学地球科学系,广州510275)关键词硅质岩δ30Siδ18O组成热水沉积长坑金银矿长坑大型金银矿是一种新型的浅成低温热液贵金属矿床,国内外尚未见类似者[1~2...
Silican and oxygen isotopic analyses showed that the δ 30 Si and δ 18 O of the ore bearing chert from Changkeng Au Ag deposit were -1 3‰~-0 1‰ and 13 6‰~18 8‰,respectively Comparative studies suggested that the Changkeng chert was deposited from hot water,101 0~154 9℃,calculated from the oxygen isotopic equilibration fractionation equation of chert water Diagenesis and recrystallization occurred after the amorphous silica deposited.Similarity of δ 30 Si composition between the chert and its wall rocks suggested that the silica derived from lixiviation of SiO 2 from the wall rocks by hot water,and then the silica was deposited rapidly and completely
出处
《矿物岩石地球化学通报》
CAS
CSCD
1998年第2期43-46,共4页
Bulletin of Mineralogy, Petrology and Geochemistry
基金
国家自然科学基金
中山大学自然科学基金
南京大学成矿作用国家重点实验室基金