摘要
纳米比亚奥乔宗蒂约巴地区铁锰矿,位于晚元古宙达马拉造山带内陆支带的东部中央南带。铁锰矿体呈层状或似层状产出于达马拉系第二岩性段石英岩地层中,矿石多呈黑色、灰黑色,中—细粒变晶结构,块状、条带状构造。矿石矿物主要有硬锰矿、针铁矿、磁铁矿、少量赤铁矿,脉石矿物主要为石英、斜长石、石膏和少量石榴子石、黑云母、锆石等。对比研究表明纳米比亚奥乔宗蒂约巴地区铁锰矿与奥乔松杜地区锰矿床的成因模式及成矿作用方式相似,铁、锰的沉积作用与海进-海退旋回有关。
The Otjozondjupa Ve-Mn depositin Namibia lies in central southern zone of inland branch tape of the Late Proterozoic Damara Orogen. The Fe-Mn orebodies occur in stratified and stratoid form in quartzite of the Second Member of the Damara System. Black or grayish black ores have medium- and fine-grained metacrystal texture and massive and banded structures. Main ore minerals are goethite, magnetite, hematite and psilomelane. Vein minerals are quartz, plagioclase, gypsum and a small amount of garnet, biotite, and zircon. The study indicates that Fe-Mn sedimentation was related to transgression-regressive cycles.
出处
《四川地质学报》
2017年第2期214-217,共4页
Acta Geologica Sichuan
