寿山大山石矿物学特征及成因初探
Mineralogical Characteristic of Dashan Stone from Shoushan and Its Genesis
周武邦 1王朝文 2严雪俊 3陈涛 2严俊3
作者信息
- 1. 浙江方圆检测集团股份有限公司,浙江 杭州 310013;中国地质大学(武汉)珠宝学院,湖北武汉 430074
- 2. 中国地质大学(武汉)珠宝学院,湖北武汉 430074
- 3. 浙江方圆检测集团股份有限公司,浙江 杭州 310013
- 折叠
摘要
矿物学特征对矿床成因的研究具有重要指示意义.为探究寿山大山石的矿物学特征及成因,本研究利用偏光显微观察、X射线粉末衍射、拉曼光谱及电子探针等表征方法,对寿山大山石的矿物学特征进行了深入研究,并依据矿物学特征探讨了流体性质、形成环境及温度.结果显示,寿山大山石的主要矿物组成为高岭石和迪开石,部分为叶腊石,次要矿物为石英、黄铁矿、赤铁矿、锐钛矿和金红石等,部分矿物(如黄铁矿等)表面可见溶蚀现象.拉曼光谱及电子探针结果显示,寿山大山石中锐钛矿、金红石、黄铁矿的存在均与岩浆热液有关,而黄铁矿中As与S和Fe的负相关及表面溶蚀现象,指示成矿流体应先经历了还原环境又经历了氧化环境.依据寿山大山石主要矿物组合及Al2O3-SiO2-H2O体系矿物的相变温压条件,得出大山石矿物组合达到稳定时温度约为250～270 ℃.
Abstract
Mineralogical characteristics have significant indicative importance in the study of the genesis of ore deposits.To investigate the mineralogical characteristics and genesis of Dashan stone from Shoushan,this study utilized polarizing microscopy,X-ray powder dif-fraction,Raman spectroscopy,and electron microprobe analysis to conduct an in-depth in-vestigation of the mineralogical features.Based on these characteristics,the fluid properties,formation environment,and temperature were discussed.The main minerals of Dashan stone from Shoushan are kaolinite and dickite,with some pyrophyllite;the secondary minerals in-clude quartz,pyrite,hematite,anatase,rutile,and ilmenite,among others.Some minerals,such as pyrite,show signs of surface dissolution.The Raman spectra and electron micro-probe results indicate that the presence of anatase,rutile,and pyrite in Dashan stone from Shoushan is related to magmatic hydrothermal fluids.The negative correlation between As and S and Fe in pyrite,along with the dissolution phenomena on its surface,suggest that the ore-forming fluids experienced a reduction environment followed by an oxidation environ-ment.Based on the main mineral assemblage of Dashan stone from Shoushan and the phase change temperature-pressure conditions of the Al2O3-SiO2-H2O system,it is concluded that the stable temperature for the mineral assemblage of Dashan Stone is approximately 250-270 ℃.
关键词
寿山大山石/矿物特征/流体来源/形成环境/成矿温度Key words
Dashan stone from Shoushan/mineralogical characteristic/fluid source/forma-tion environment/ore-forming temperature引用本文复制引用
出版年
2024
NETL
NSTL
万方数据