摘要
661铀矿床是我国重要的典型火山岩型铀矿床。它赋存于上侏罗统磨石山群九里坪组流纹岩内,其矿体严格受“绿色层”控制。本文研究表明,“绿色层”岩性复杂,由凝灰岩、沉凝灰岩及部分顶、底板相流纹岩角砾及粘土物质组成。构成“绿色层”的主要粘上矿物是伊利石及蒙脱石混层矿物,具构造热液蚀变复合成因的特点,是矿区北部由逆掩断层活动产生的构造热液沿层间破碎带发生强烈伊利石化的产物。“绿色层”的控矿作用在于对成矿流体的PH值起重要的缓冲作用,从而为铀的沉淀富集提供有利的地球化学环境。
No 661 Uranium deposit is one of the important uranium deposits of typical volcanic rock-type South China. Tt is located in rhyolite of Late Jurassic Jiuliping group and closely related to 'greem strara'. Onthe basis of detailed field survey and lab study, it is convinced that the 'green strata' are complicated in rock components and consist of tuffs, tuffite, breciated rhylite and clay minerals. Clay materials in 'green Strata' chiefly consist of illite and mont-illite mixed-layer minerals and possess tectonic hydrothermal alteration composite genesis. Formation of 'green Strata is attributed to the thrust and its derived stress in this area.In the process of mineralization the 'green strata' play an important role of PH buffer effect for ore-forming fluid
出处
《南京大学学报（自然科学版）》
CAS
CSCD
1992年第3期439-451,共13页
Journal of Nanjing University（Natural Science）
基金
博士点基金资助课题(8928426)
关键词
火山岩型
铀矿床
绿色层
控矿作用
Volcanic rock-type uranium deposit
Tectonic hydrothermal alteration
Green Strata
Illite
Buffer effect
