广东尖山铁矿床中石榴石的标型特征和找矿意义

广东尖山铁矿床内发育了一个完整的钙铝榴石—钙铁榴石系列矿物,它们与矿化有着密切的关系,因此,研究石榴石的标型特征对探讨矿床形成条件是很重要的,对找矿也是有意义的。一、石榴石的产出特征尖山矿床赋存在尖山花岗岩体与中—上石炭统壶天群和下二叠统栖霞组碳酸盐岩层的接触带中。从花岗岩体向碳酸盐岩层形成了如下蚀变分带:绿帘石化花岗岩带→透辉石钾长石石英岩带→石榴石

Typomorphic Characteristic ef Garnet From Jianahan lron Deposit in Guangdong and Thier Signif icance in Exploration of Deposits

In the Jianshan iron deposit, minerals of a complete grossular andradite series are developed and closely related to mineralization. This article deals with occurrence, physical and optical properties, chemical compositions, assem- blages and genetic conditions of these minerals. From altered granite to exo- contoot zone grossular gradual changes into andradite, and accordingly their physical and optical properties change regularly. Andradite is closely associated with magnetite mineralization and occurs in the exocontact zone whereas grossular is closely associated with molybdenite mineralization and occurs in altered granite zone.