“泰顺石”的矿物学特征及其对成因的指示  

Mineralogical characteristic of the’Taishunshi’and their genetic significances

作　　者：徐艳晓 王朝文 刘明军 周武邦 陈涛[1] 杨明星[1] 洪汉烈[2] XU Yan-xiao;WANG Chao-wen;LIU Ming-jun;ZHOU Wu-bang;CHEN Tao;YANG Ming-xing;HONG Han-lie(Gemmological Institute,China University of Geosciences,Wuhan 430074,China;Faculty of Earth Sciences,China University of Geosciences,Wuhan 430074,China;Natural Resources and Planning Bureau of Taishun County,Wenzhou 325500,China)

机构地区：[1]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)地球科学学院,湖北武汉430074 [3]泰顺县自然资源和规划局,浙江温州325500

出　　处：《矿物学报》2021年第2期213-223,共11页Acta Mineralogica Sinica

基　　金：国家重点研发计划项目(编号:2018YFF0215400);中国地质大学(武汉)珠宝检测技术创新中心开放基金(编号:CIGTXM-S201530,CIGTXM-S201836,CIGTWZ-2020015);国家自然科学基金项目(编号:41602037);湖北省自然科学基金(编号:2016CFB183)。

摘　　要："泰顺石"是产于浙江省温州市泰顺县龟湖镇的一种叶蜡石型雕刻石,占据着一定的市场份额。"泰顺石"中叶蜡石根据成因可分为热液交代型和热液充填型两类。目前,关于"泰顺石"的形成过程及环境、温压条件等的认识仍然较为缺乏,尤其对于"泰顺石"形成的蚀变演化过程仍然存在着较大的争议。本文利用偏光显微镜、X射线粉晶衍射仪、激光拉曼光谱仪、X射线荧光光谱仪等对其矿物学特征进行研究,并分析其形成环境以及成矿过程。结果表明,"泰顺石"以高硅叶蜡石型和高铝叶蜡石型为主,主要矿物组成为叶蜡石,并含有少量的石英、硬水铝石、高岭石、伊利石、赤铁矿、刚玉等。热液交代型叶蜡石表现为叶蜡石交代围岩中长石和硬水铝石形成交代残余结构和交代假象结构,热液充填型叶蜡石表现为叶蜡石在成矿后期充填于裂隙中,硬水铝石和刚玉为叶蜡石形成过程中共生矿物,在"泰顺石"中分别表现为石钉和蓝钉。"泰顺石"的矿物组合直接或间接记录了成矿过程中热液交代流纹质晶屑凝灰岩的围岩蚀变过程,如叶蜡石化、硬水铝石化等,红色"泰顺石"样品中赤铁矿的存在可能指示了成矿后期向氧化环境发生了转变,这些矿物组合特征指示了"泰顺石"可能形成于300~410(±10)℃的中温环境。The’Taishunshi’is a kind of pyrophyllite-type carving stone occurred in the Guihu township,Taishun County,Wenzhou City,Zhejiang Province.It has occupied a certain market share.The pyrophyllite in the’Taishunshi’can be classified into the hydrothermal metasomatic type and hydrothermal infilling type.At present,there is relatively lack of understandings on the process,environment,temperature and pressure conditions of the formation of’Taishunshi’.Especially,there is still a great controversy on the alteration and evolution process of the formation of’Taishunshi’.In this study,optical microscope,X-ray diffraction(XRD)spectrometer,laser Raman spectroscopy(LRM),and X-ray fluorescence spectrometer are used to study the mineralogical characteristics of the’Taishunshi’and to analyze its formation environment and process.The results show that the’Taishunshi’,including dominant high-aluminum pyrophyllite type and high-silicon pyrophyllite type,are composed of major pyrophyllite and minor quartz,diaspore,kaolinite,illite,hematite,and corundum.Petrographic observation revealed that the hydrothermal metasomatic-type pyrophyllite is appeared to have reacted with feldspar and diaspore in the wall rock,with metasomatic relict texture and metasomatic pseudomorphic texture.The hydrothermal infilling-type pyrophyllite is appeared to have filled in cracks at the late-ore stage.Diaspore and corundum,as paragenetic minerals formed in the formation process of pyrophyllite,occurred as stone nails and blue nails in the’Taishunshi’,respectively.The different mineral assemblages of the’Taishunshi’samples had directly or indirectly recorded the metasomatic alteration ofthe rhyolitic crystalline tuff by the hydrothermal fluid,such as pyrophyllitization,diasporization,etc.The existence of hematite in the red’Taishunshi’likely indicate the transition toward oxidization environment in the late-ore stage.These mineral assemblages of the samples may indicate that the’Taishunshi’could be mainly formed in an

关 键 词：泰顺石 雕刻石 叶蜡石 硬水铝石 

分 类 号：P571[天文地球—矿物学] P579[天文地球—地质学]