矽卡岩中石榴石特征与成矿关系的探讨──以上蔡硫－多金属矿区前峰西矿段为例

RELANON OF CHARACTERISTIC CARNET TO MINERALIZATION WITH AN EXAMPLE FROM QIANFENG ORE BLOCK OF SHANGCAI POLYWETALLIC FIELD

福建省上蔡硫－多金属矿区前峰西矿段以高氟含铜磁黄铁矿矿化为主，其次为含银铜铅锌矿化，亦见黄铜矿、白钨矿矿化。矿体呈似层状赋存于上石炭统船山组一下二叠统栖霞组泥质灰岩中。该层位已强烈矽卡岩化；矽卡岩主要矿物成分为石榴石、透辉石、绿帘石等。石榴石、透辉石与矿化关系密切。从光性特征、矿物成分可将石榴石分为锰铝榴石、钙铁榴石、钙铝榴石三种，其中锰铝榴石与磁黄铁矿、钙铁榴石与黄铜矿、钙铝榴石与白鹤矿有密切共生关系。这一规律对找寻相应类型矿化有着明显指示性作用。

Abstract The western ore block, Qianfeng, of Shangcai sulfur polymetallic feld attributes its generation mainly to high fluor, copper bearing pyritization, lessly topolymetalization (silver, f copper, leak and zinc) The ore bodies are hosted as stratoed in the argillaceous limestones of both Upper Carboniferous Chuallshan formation (C3c) and Lower Permian aam formation(p,q) which have undertaken intensive skarnhation so as to form a mineral assemblage maly of gsrnet, diopeide, epidotc, etc. The former two dinerals are found to show a close rebation to the metalljzation. But emphasis should be Put on the garnet phase which can bedistinguished into spessartine, alldeinte alld grossufor given its poticsl diameters and chemiCal composition, one coexisting with pyrrhotite, another with chalcopyrite, and the third with scheelite. These coexisting relations may act as a good indicator to prospecting for the ageral resources of the same type.