吉林省磐石市三泉西硅灰石矿床地质特征及成因

Geological features and genesis of the Sanquanxi wollastonite deposit in Panshi City,Jilin Province

三泉西硅灰石矿位于吉林省磐石市。本文对其矿床地质特征、矿体特征及矿石特征等进行初步调查,三泉西硅灰石矿床已知矿体均产于燕山期钾长花岗岩与上石炭统磨盘山组大理岩外接触带,矿体与围岩界线清楚。矿石类型为硅灰石-方解石-石英型。矿体与地层产状基本一致,从岩体向外所见为岩浆岩→大理岩→矿体→大理岩,接触带并未成矿,矿体与围岩均无明显的交代现象。通过分析得出,三泉西硅灰石矿体与石炭系碳酸盐建造有生成关系,是产于一定层位的,含硅质碳酸盐被岩浆侵入受热使原岩在新的物理化学条件下形成了新的稳定组合,并生成了硅灰石矿。因此,三泉西硅灰石矿床成因类型为接触变质型矿床。

The Sanquanxi wollastonite deposit is located in Panshi City,Jilin Province.In this paper,we conduct a preliminary investigation on the geological features,ore body characteristics and ore characteristics of Sanquanxi wollastonite deposit from the outer contact zone between Yanshanian moyite and marble of Upper Carboniferous Mopanshan Formation,and the boundary between ore body and surrounding rock is clear.The ore type is wollastonite calcite quartz type.The occurrence of ore body is basically the same as that of strata.From the rock mass outward,it can be seen as magmatic rock→marble→ore body→marble.There is no mineralization in the contact zone,and there is no obvious metasomatic phenomenon between ore body and surrounding rock.Through analysis,it can be concluded that the Sanquanxi wollastonite ore body is related to carboniferous carbonate formation,which occurs in certain strata.The siliceous carbonates are invaded by magma and heated to form a new stable combination of primary rocks under new physical and chemical conditions,and wollastonite deposits are formed.Therefore,the genetic type of the Sanquanxi wollastonite deposit is a contact metamorphic type deposit.