地质通报2011，Vol.30Issue(10)：1587-1597,11.
金沙江中段含锰铁矿化点的发现及其找矿前景
The discovery of the manganese-bearing iron mineralization spots in the central segment of the Jinsha River and the prospecting potential,
摘要
Abstract
Located in eastern Xijinwulan -Jinshajiang suture zone and composed of the rock series of metamorphic basic volcanic rocks-clastic rocks, the original Xiongsong Group has been an object of long-term controversy as to whether it belongs to Precambria or not. Some iron mineralization spots were found during the investigation,and it is thus believed that iron mineralization was closely related to the volcanism with the simultaneous superimposition of the Indosinian monzogranite, implying an excellent metallogenic condition and prospecting potential. Iron ores mainly show massive, beehive and brecciated forms, with subordinate bubble, tumor and rope forms. Ore minerals are mainly manganese-bearing magnetite and subordinately hematite, limonite, malachite and relict pyrite of oxidation. The content of Tfe from the sample can be over 50%, implying richness of Fe. High resolution LA-ICP-MS zircon U-Pb in situ dating yielded the age of 228.3±2.1 Ma for meta-basic basalt as the host rock of the ore deposit, which shows that the eruption age of Xiongsong Group related closely to mineralization is Middle Triassic. The chemical characteristics of the ore-bearing meta-basic volcanic rocks are similar to those of E- MORB, suggesting the tholeiite series and implying the tectonic setting of a small ocean basin. Meanwhile, the iron ore spots are well consistent with the ground high aerotnagnetic anomalies. This may constitute an important clue for finding volcanic type manganese-bearing iron deposits in the middle Jinsha River region and its adjacent areas.关键词
金沙江中段/含锰铁矿化/变玄武岩/LA-ICP-MS锆石U-Pb测年/找矿前景Key words
central segment of Jinshajiang River/ manganese-bearing iron mineralization/ meta- basalt/ LA- ICP- MS zircon U-Pb dating/ore prospecting potential分类
天文与地球科学引用本文复制引用
何世平,辜平阳,李荣社,王超,于浦生,时超,查显锋..金沙江中段含锰铁矿化点的发现及其找矿前景[J].地质通报,2011,30(10):1587-1597,11.基金项目
中国地质调查局地质大调查项目《青藏高原前寒武纪地质、古生代构造-古地理综合研究》(编号:1212010610102) （编号:1212010610102）
