重庆玉峡天青石矿床矿石结构构造特征及成因意义
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摘要
在综合分析矿床的基本地质特征基础上,重点开展显微镜下矿石结构构造的分析研究,结合矿段的岩相古地理分析,探讨重庆铜梁县玉峡天青石矿床的成因机制。玉峡天青石矿床的矿石矿物主要是天青石和菱锶矿,以及少量硬石膏、石膏;脉石矿物主要是白云石和少量方解石。矿石构造主要有条纹-条带状构造、脉状构造、角砾状构造、次生淋滤构造(钟乳状、皮壳状、蜂窝状构造);矿石结构为自形-半自形晶粒结构、他形晶粒结构、交代结构及交代残余结构,表生期菱锶矿常见放射状、纤维状集合体。条纹条带状构造是主要矿石构造,与沉积作用有关;脉状构造、次生淋滤状构造、交代残余结构等也为矿床成因分析提供了重要依据。玉峡天青石矿床为蒸发沉积(盐类)矿床。
Based on the comprehensive analysis of the basic geological characteristics,the genetic mechanism of the Yuxia celestite deposit in Tongliang of Chongqing is discussed by study of ore texture and structure under the microscope and analysis of lithofacies paleogeography.It shows that ore minerals of the deposit are celestite(SrSO4)and strontianite(SrCO3),with minor anhydrite and gypsum.Gangue minerals are composed of dolomite with small amount of calcite.Ore structures include stripe structure,banded structure,vein structure,breccias structure,secondary leaching structures(stalactitic structure,crustose structure and honeycomb structures).Commonly occurred ore textures are euhedral-subhedral crystalline texture,poikilocrystallic texture,metasomatic texture and metasomatic relict texture.Radial and fibrous aggregates occur frequently in the epigenetic stage.Stripe structure is the major structure of the ore,which is related to sedimentation.Vein-like structures,secondary leaching-like structures,and metasomatic residual structure also provideimportant basis for the genetic analysis of the deposit.It is believed that the Yuxia celestite deposit is an evaporative deposit(salt)deposit.
Based on the comprehensive analysis of the basic geological characteristics,the genetic mechanism of the Yuxia celestite deposit in Tongliang of Chongqing is discussed by study of ore texture and structure under the microscope and analysis of lithofacies paleogeography.It shows that ore minerals of the deposit are celestite(SrSO4)and strontianite(SrCO3),with minor anhydrite and gypsum.Gangue minerals are composed of dolomite with small amount of calcite.Ore structures include stripe structure,banded structure,vein structure,breccias structure,secondary leaching structures(stalactitic structure,crustose structure and honeycomb structures).Commonly occurred ore textures are euhedral-subhedral crystalline texture,poikilocrystallic texture,metasomatic texture and metasomatic relict texture.Radial and fibrous aggregates occur frequently in the epigenetic stage.Stripe structure is the major structure of the ore,which is related to sedimentation.Vein-like structures,secondary leaching-like structures,and metasomatic residual structure also provideimportant basis for the genetic analysis of the deposit.It is believed that the Yuxia celestite deposit is an evaporative deposit(salt)deposit.
引文
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[2]徐旃章.华蓥山锶矿带构造控矿机理[J].成都理工学院学报,1994,21(3):79-86.Xu D Z.The mechanism of tectonic control of Sr-ore belt in Huaying Mountains[J].Journal of Chengdu University of Technology,1994,21(3):79-86.(in Chinese)
[3]陆显发,杨献珍.浅析云南金顶锶矿矿床成因[J].矿产勘查,2013,4(4):414-420.Lu X F,Yang X Z.Primary analysis on the genesis of Jinding strontium deposit in Yunnan Province[J].Mineral Exploration,2013,4(4):414-420.(in Chinese)
[4]秦震.重庆地区天青石型锶矿床成矿特征[J].成都理工学院学报,1998,25(2):224-232.Qin Z.Metallogenic characteristics of the celestitetype Sr deposit in Chongqing Area[J].Journal of Chengdu University of Technology,1998,25(2):224-232.(in Chinese)
[5]徐兴国,谷秀兰.中国的锶矿床[M].成都:四川科学技术出版社,1999:40.Xu X G,Gu X L.Strontium Deposits in China[M].Chengdu:Sichuan Science and Technology Press,1999:40.(in Chinese)
[6]孙艳,刘喜方,王瑞江,等.青海大风山锶矿床中天青石的成分特征[J].矿床地质,2013,32(1):148-156.Sun Y,Liu X F,Wang R J,et al.Compositional characteristics of celestite in Dafengshan strontium deposit,Qinghai Province[J]. Mineral Deposits,2013,32(1):148-156.(in Chinese)
[7]Farhad Ehya,Behnaz Shakouri,Mehrdad Rafi.Geology,mineralogy,and isotope(Sr,S)geochemistry of the Likak celestite deposit,SW Iran[J].Carbonates and Evaporites,2013,28(4):419-431.
[8]刘牡丹,李光辉,董海刚,等.中国碳酸锶工业生产现状与进展[J].无机盐工业,2006,38(1):9-12.Liu M D,Li G H,Dong H G,et al.Progress and present status of strontium carbonate industry in China[J].Inorganic Chemicals Industry,2006,38(1):9-12.(in Chinese)
[9]翟裕生,姚书振,蔡克勤,等.矿床学[M].北京:地质出版社,2011:16-18.Zhai Y S,Yao S Z,Cai K Q,et al.Economic Geology[M].Beijing:Geological Publishing House,2011:16-18.(in Chinese)
[10]Houshang Pourkaseb,Alireza Zarasvandi,Mohsen Rezaei,et al.The occurrence and origin of celestite in the Abolfares region,Iran:Implications for Srmineralization in Zagros fold belt(ZFB)[J].Journal of African Earth Sciences,2017,134:352-364.
[11]薛天星.中国(天青石)锶矿床概述[J].化工矿产地质,1999,21(3):141-148.Xue T X.Sr(celestite)deposits in China[J].Geology of Chemical Minerals,1999,21(3):141-148.(in Chinese)
[12]Ramadan F S,Zalamah A A.Sedimentological and geochemical evidence to elucidate an evaporiticcarbonate paleoenvironment,Middle Miocene Red Sea coast,Egypt[J].Arabian Journal of Geosciences,2013,6(6):1703-1716.
[13]吴应林.中国南方三叠纪岩相古地理与成矿作用[M].北京:地质出版社,1994:47-48.Wu Y L.Triassic Lithofacies Palaeogeography and Mineralization in Southern China[M].Beijing:Geological Publishing House,1994:47-48.(in Chinese)
[14]李建,顾文帅,黄治清,等.玉峡式锶矿床表生溶蚀作用研究[J].中国矿业,2017,26(6):154-156.Li J,Gu W S,Huang Z Q,et al.Study on supergenetic corrosion of Yuxia-style Sr ore deposit[J].China Mining Magazine,2017,26(6):154-156.(in Chinese)