论文部分内容阅读
在苏丹东部地区新元古代地层中,新发现的BIF铁矿是与火山岩密切相关的Algoma型铁矿,矿石品位TFe37.78%,对进一步研究努比亚地盾的形成时代和古地理环境有一定的参考意义。苏丹79区块发现的含铁石英砂岩,呈北东向带状分布,角度不整合于努比亚地盾之上,通过与西澳CID型铁矿对比,存在交错层理和底砾岩等明显的再生沉积特征,矿石品位TFe 31.91%~39.33%;通过对BIF型铁矿、CID型铁矿和努比亚杂砂岩三者部分元素及氧化物含量的分析对比,以及控矿地质因素分析,CID型铁矿是由BIF铁矿风化剥蚀后搬运沉积于附近古河道内;苏丹努比亚地盾区CID型铁矿的发现,为今后找矿工作提供了新目标,具有十分重要的找矿意义。
In the Neoproterozoic strata of eastern Sudan, the newly discovered BIF iron ore is Algoma type iron ore closely related to volcanic rock with an TFe of 37.78%. The further study on the age of the Nubian shield and paleogeographic environment Certain reference meaning. The iron-bearing quartz sandstone found in block 79 of the Sudan is distributed in a northerly zonal distribution that is not integrated with the Nubian ground shield. In contrast to the CID type iron ore in Western Australia, there are cross-bedding and base conglomerates Obvious regenerated sedimentary characteristics, and the ore grade TFe is 31.91% ~ 39.33%. By analyzing and comparing some elements and oxide contents of BIF iron ore, CID iron ore and Nubian miscellaneous sandstone, and the analysis of ore-controlling geological factors CID-type iron ore is transported by the BIF iron ore after weathering and denudation and is deposited in nearby ancient river courses. The discovery of CID-type iron ore in the Nubian shield zone in Sudan provides a new target for prospecting work in the future, significance.