摘要
河南西峡金红石矿床位于秦岭造山带东段南缘，古生代陆缘断陷带内。矿体赋存于古生代信阳群龟山组第三段。含矿岩石为含金红石角闪质片岩，其原岩类型为富钛的碱性玄武岩类，具有板内陆壳碱性玄武岩的地球化学特征。海西—印支期，本区发生区域变质和变形作用。变质作用高峰期后，又经受了一次广泛的热液改造。所以，该矿床应为热液改造的火山－沉积变质金红石矿床。
Xixia rutile ore deposit is located in a palaeozoic fault depression at the south mangin of the east Qinling orogenic belt. Ore bodies occur in the grd member of Guishan Formation of Xinyang Group as layer, layered or lense form coinciding with the country rocks. Ti occurs as Ti minerals and isomorphised Ti in gangue minerals. Rutile hornblende schist is the ore bearing rock metamorphosed from the original alkali basaltic rocks which is rich in Ti and characterized by geochemistty of intraplate basalt in continentl crust. The basalt was formed in fault depressed sea trough at continental margin.Hornblende , biotite and muscovite collected from Xinyang Group is determined to be aged at 25. 9 13. 6 Ma. During Hercynian and Indo china Period it was metamorphosed and rutile ore was formed. Ore bearing rock is of epidotite hornblende fase with the estimated metamorphism T of 400℃ and P of 0. 4 0. 5 Gpa. Extensive post peak metamorphism hydarothermal modification resulted in actinolization tremolitization, biotitizotion chloritization calcitization and pyritization. There-fore it is a hydrothermally reworked volcanic sedimentary rutile ore deposit.
出处
《地质找矿论丛》
CAS
CSCD
1995年第1期25-37,共13页
Contributions to Geology and Mineral Resources Research
