摘要
南天山中西段分布一条长约 80 0公里的含碳碎屑岩建造 (通称黑色岩系 ) ,其中赋存汞、锑、金、银等中低温热液矿床 ,系统研究表明 :南天山中西段燕山期仍是重要的内生金属成矿时期。为了解决该区容矿地层的时代 ,对采自查汗萨拉南北矿带 ,萨瓦亚尔顿 ,古勒克达坂和卡拉脚古牙五个地区样品进行了铷 -锶年龄测定 ,得到的结果分别是 :2 83± 2 1Ma,2 89±2 0 Ma,2 88± 18Ma,2 78± 2 3 Ma和 3 80± 3 2 Ma,除卡拉脚古牙样品为中泥盆统外 ,其它皆为晚石炭世 -早二叠世 ,测年数据与新发现的化石鉴定成果一致 ,证明容矿岩系的时代为晚古生代。这一研究进展 ,将为进一步深入研究黑色岩系的形成环境和含矿性提供基础资料 ,也为该区的地质研究。
In the central and western sections of south Tianshan Mountain, a belt of carbon-bearing detrital rock formation, generally known as black rock series, riched in Hg, Sb, Au and Ag meso-epithermal ore deposits is extended about 800km. The research indicated that the important time of endogenetic metallization of central and western sections of. South Tianshan Mountain is Yanshanian epoch. Dating for stratum, some samples from host strata of Chahansala south and north ore belt, Sawayalrdun, Gulake and Kalajiaoguya have been determined by Rb-Sr method with the result of 283+/-21Ma, 289+/-200Ma, 288+/-18Ma, 278+/-23Ma and 380+/-32Ma, respectively. All of them belong to late Carboniferous-early Permian, except one Middle Devonian sample from Kalajinoguya. These data show no difference with the result obtained from newly discovered fossils. This. means that the timing of host strata as A whole is late Paleozoic. The present study provides some basic data for the further research on the forming environment and potentiality of the black rock series and on geology, tectonic evolution and metallogenic law of the area.
出处
《岩石学报》
SCIE
EI
CAS
CSCD
北大核心
2002年第4期593-600,共8页
Acta Petrologica Sinica
基金
国家"九五"重点科技攻关 (新疆 30 50 4 0 4 )项目资助
