摘要
南秦岭显生宙喷气沉积成矿起始于晚志留世，泥盆纪是热水沉积成矿的主富集期，形成了以Ｐｂ，Ｚｎ为主的，伴生有Ｃｕ，Ａｇ，Ａｕ，Ｆｅ的矿床（体）和Ａｕ，Ｈｇ，Ｓｂ，Ａｓ等富集体，一般可划分出沉积和成岩两个阶段。之后发生了至少三个阶段的后生成矿作用，包括变质、改造、叠加成矿，以及局部的再造成矿。这一成矿系统有统一的物源和相似的金属组合，下伏沉积柱和基底提供了充足的Ｐｂ，Ｚｎ，Ａｕ，Ａｇ，Ｃｕ，Ｈｇ，Ｓｂ，Ａｓ以及Ｆｅ，Ｂａ等。成矿与该区地壳的构造盆地建造岩浆变质变形等演化相伴随，不同阶段与不同性质成矿流体的形成与贯穿造山前后的一系列热事件有密切成因联系，形成了这一金属硫化物成矿系统。
The Phanerozoic sedimentary exhalative mineralization in south Qinling region took place in the tectonic sedimentary settings around Devonian, and developed, along with the evolution of the tectonics and magmatism, eventually into a characteristic metallogenic system. During the periods of about 200Ma from Upper Silurian to Lower Triassic, the tectonic styles, basin types, sedimentary formation, metamorphic deformational processes and magmatic activities were all associated with a series of thermal events that occurred before and during the early orogenic stage, and controlled the evolution of the metallogeny. The system is of unified material source and with the same metal association, i.e., Pb Zn Au Cu Hg Sb As, and secondarily Fe Ba. Although the nature of the mineralization fluids in variable with periods, but the main form of mineralization is the same, i.e., hydrothermal sedimentation precipitation, metasomatism and filling. Two periods and Five stages of mineralization are recognized. Ore deposits are widely distributed over the whole of the north margin of the Yangtze Block, and the mineralization shows some evident characteristics of inheritance and continuity.
出处
《地学前缘》
EI
CAS
CSCD
1999年第1期171-179,共9页
Earth Science Frontiers
基金
国家科技攀登计划项目
地质矿产部"八五"重要基础研究项目
关键词
热事件
喷气-沉积
成矿作用
热水沉积岩
贵金属
South Qinling, thermal events, sedimentary exhalative mineralization, hydrothermal sedimentary rock, precious metal
