河南省嵩箕地区南部铝土矿成矿物质来源研究

Study on the sources of bauxite ore-forming material in southern Songshan-Jishan region,Henan province

对于嵩箕地区铝土矿的物质来源,过去以主要来自基底碳酸盐岩的观点居多。然而,近期在嵩山地区发现的熊耳群,其稀土元素地球化学特征与铝土矿非常相近,由此联想到铝土矿的物质来源可能与熊耳群有关。为进一步研究铝土矿成因,通过铝土矿含矿岩系、基底碳酸盐岩及熊耳群的稀土元素特征参数对比及地质分析,对成矿物质来源进行了讨论,得出与以往观点不同的认识。认为区内铝土矿含矿岩系中的三种不同岩(矿)石的物质来源具有同源性,成矿物质主要来源于中元古界熊耳群玄武岩类,少量物质来自奥陶系白云质灰岩。

It was viewed that the sources of bauxite ore-forming material in Songshan-Jishan region was mainly from the basal carbonate rock in the past.Recently the Xionger group was found in Songshan region,its rare earth elements(REE)geochemical characteristics were very similar to the bauxite deposit,which suggested that the material sources of bauxite may be related to the Xionger group.In order to further study the origin of the bauxite deposit,the sources of ore-forming materials was discussed by comparison of the REE characteristic parameters and geological analysis of bauxite ore-hosted strata,basal carbonate rock and the Xionger group.It is considered that the material sources of three different rocks or orein the bauxite ore-hosted strata in the region are homologous,and the metallogenic material mainly comes from the basalt in the middle Proterozoic,and a small amount of material comes from dolomite limestone in the Ordovician.