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

作　　者：周武邦 王朝文 严雪俊 陈涛[2] 严俊 ZHOU Wubang;WANG Chaowen;YAN Xuejun;CHEN Tao;YAN Jun(Zhejiang Fangyuan Testing Group Co.,Ltd.,Hangzhou 310013,China;Gemmological Institute,China University of Geosciences,Wuhan 430074,China)

机构地区：[1]浙江方圆检测集团股份有限公司,浙江杭州310013 [2]中国地质大学(武汉)珠宝学院,湖北武汉430074

出　　处：《宝石和宝石学杂志（中英文）》2024年第S01期83-85,共3页Journal of Gems & Gemmology

基　　金：浙江省市场监督管理局科研计划项目(ZC2021A038);国家自然科学基金项目(42072056);浙江省非金属矿工程技术研究中心开放课题(ZD2020K02)。

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Al_(2)O_(3)-SiO_(2)-H_(2)O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℃。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 diffraction,Raman spectroscopy,and electron microprobe analysis to conduct an in-depth investigation 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 include quartz,pyrite,hematite,anatase,rutile,and ilmenite,among others.Some minerals,such as pyrite,show signs of surface dissolution.The Raman spectra and electron microprobe 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 environment.Based on the main mineral assemblage of Dashan stone from Shoushan and the phase change temperature-pressure conditions of the Al_(2)O_(3)-SiO_(2)-H_(2)O 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 

分 类 号：P619.2[天文地球—矿床学]