摘要
本文选择广西大明山钨矿区含矿石英脉中的辉钼矿和马岭矿区钻孔岩芯中辉钼矿进行了Re-Os法同位素组成的测定，获得了大明山95．40Ma的等时线年龄和马岭95．00～95．79Ma的模式年龄，表明二者的成矿时代一致。这一结果表明，丹池成矿带从南段的大明山矿田到北西段的大厂矿田（91^#矿体和100^#矿体的成矿时代均集中于94．5Ma前后）的成矿作用都是在燕山晚期发生的，而且几乎同时。考虑到丹池矿带内同一时期幔源岩浆岩的普遍存在及区域大地构造背景，认为成矿作用可能与幔源物质的上涌、深大断裂通达到地幔有关。在这样的动力学背景下，丹池成矿带具有良好的找矿前景，应该注意通过借鉴大明山钨矿“四位一体”模式，在大明山矿田寻找钨矿的同时也注意锡多金属，在大厂矿田寻找锡、铅锌多金属的同时也注意寻找独立钨矿。大明山直立大脉型、缓倾斜石英脉型、网脉型和岩体型钨矿同时存在的“四位一体”模式，也值得湘南、赣南等地参考。
In this article, Re-Os dating of molybdenites from the ore-bearing quartz vein in the Damingshan mining district and the drilling core in the Maling mining district of Guangxi Province, presents the isochron age of 95.40 Ma for Damingshan and the model age of 95.00-95.79 Ma for Maling, indicating the consistent metallogenic epochs in the two districts. The results also indicate that the mineralization in the Danchi metallogenic belt from the southern section of Damingshan ore field to the northwestern section of Dachang ore field （the metallogenic epochs of No. 90 and No. 100 orebodies both concentrated around 94.5 Ma） occurred in the Late Yanshan Age. Considering widespread contemporaneous mantle-derived magmatic rocks in the Danchi metallogenic belt and its regional geotectonic setting, the mineralization might he pertinent to the uprising of mantle source mass along deep faults connected with the mantle. Such the geodynamic background makes the Danchi metallogenic belt great potential for prospecting. The Damingshan tungsten deposit contains four occurrences of tungsten veins, the vertical large vein type, the slightly dipping quartz vein type, the network type and the rock mass type, forming a unique model of ＂ four types in one deposit＂. It is worth noticing that much attentions should he given on the tin-multiple metals except tungsten in the Damingshan ore field and the tungsten except for the tin and zinc-leadmultiple metals in the Dachang ore field. Therefore, the model of Damingshan will give a guide for exploration in southern Hunan and southern Jiangxi.
出处
《地质学报》
EI
CAS
CSCD
北大核心
2008年第7期873-879,共7页
Acta Geologica Sinica
基金
国家科技支撑计划“南岭地区有色-贵重金属成矿潜力及综合探测技术示范研究”课题(编号2006BAB01A01)
中国地质调查局“中国成矿体系综合研究”项目(编号1212010733803)
“我国重要矿产和区域成矿规律研究”(编号1212010535804)
危机矿山接替资源勘查项目计划“广西南丹铜坑锡矿接替资源勘查项目”(200545022)等项目资助的成果
关键词
大明山钨矿
成矿时代
找矿前景
辉钼矿Re-Os法
“四位一体”
丹池成矿带
Damingshan tungsten deposit
metallogenic epoch
prospecting potential
Re-Os dating of molybdenite
the ＂four types in one position＂ model
Danchi metallogenic belt
