摘要
滇东南锡成矿带是中国重要的锡多金属成矿带,滇西锡成矿带向南与东南亚锡矿带相连,两成矿带锡矿资源潜力大,对比滇东南、滇西区域地质背景和锡成矿作用特征,有助于进一步明确两成矿带锡矿的找矿方向。对比分析表明,两成矿带在成矿地质背景和成矿作用特征方面具有共同的成矿有利条件:如大地构造同属板块边缘、地体锡的初始富集、花岗岩浆高分异演化、长时间跨度的岩浆热液活动等,使得两成矿带大量富集锡。但是两成矿带的差异性:如幔源成分的加入、多金属元素的富集矿化、多期次地质作用的叠加、围岩性质的差异、构造发育程度等因素,又使得两成矿带具鲜明的矿化差异特征。据此指出,在滇东南应寻找晚白垩世花岗岩体内外接触带的矽卡岩型锡矿及其他多金属矿;在滇西地区除注重云英岩型锡矿床的勘探外,也要重视对中小矽卡岩型锡矿床深部矿体的寻找。
Southeastern Yunnan is an important tin polymetallic metallogenic belt in China. The south of Western Yunnan belt is connected with Southeastern Asia tin belt. Both Southeastern and Western belts are high potential resources of tin ore. The geological settings and the tin mineralization characteristics are compared between the southeastern and the western Yunnan to clarify the prospecting directions of two belts. Results show that the two belts presents the same favorable metallogenic conditions in metallogenic geological setting and mineralization characteristics, such as tectonic environment belonging to plate boundaries, tin enrichment originating in terrane, highly fractionated of granitic magma evolution, long span of magmatie hydrothermal activities, etc. The common favorable metallogenic conditions enable the two belts a large tin accumulation region. However, the variance between the two metallogenic belts bring up significant different characteristics of mineralization, such as addition of mental-derived components, enrichment and mineralization of multi-metal elements, superposition of periods of geological processes, differences of surrounding rocks, development degree of structure, etc. According to the results, we come to the conclusion that the skarn-type tin deposits is possibly located near the contact zone of Cretaceous granite body in southeastern Yunnan belt and it is important to focus on searching in deep orebody for small and medium-sized skarn-type tin deposits besides the greisen tin deposits exploration in western Yun-nan belt.
出处
《地质科技情报》
CAS
CSCD
北大核心
2014年第1期163-170,共8页
Geological Science and Technology Information
基金
构造成矿成藏国土资源部重点实验室开放基金项目(gzck2012006)
国家科技支撑计划项目(2011BAB04B06)
关键词
锡成矿带
区域地质背景
成矿特征
滇东南
滇西
tin metallogenie belt regional geological settings
ore-forming charaeteristics SoutheasternYunnan western Yunnan
