江西岩背斑岩锡矿的成岩成矿时代及其地质意义
摘要
岩背锡矿地处南武夷山西坡江西会昌县境内。该矿以富含原生黄玉为特征,是本区至今发现的唯一大型独立锡矿床。笔者对矿区内含锡花岗斑岩和成矿作用早阶段形成的石英—黄玉—锡石—硫化物脉进行了Rb-Sr同位素年代学研究,获得全岩和石英矿物Rb-Sr等时线年龄分别为(128.1±3.3)Ma(2σ,MSWD=1.07,Ir=0.7163±0.0052)和(125.5±6.1)Ma(2σ,MSWD=1.5,Ir=0.7130±0.0050),表明岩背锡矿的成岩成矿作用均发生于早白垩世晚期,其成因与中生代火山期后高位侵入的花岗斑岩密切相关。
Located in western Wuyi Mountain within Huichang County of Jiangxi Province,the Yanbei tin deposit with rich original topaz is the only large-sized tin deposit so far discovered in the study area.Isotopic chronological study of the tin-bearing granite-porphyry and quartz-topaz-cassiterite veins formed at the early ore-forming stage shows that the quartz-topaz-cassiterite veins have a quartz fluid-inclusion Rb-Sr isochron age of(125.5±6.1) Ma(2σ,MSWD=1.5,Ir=0.7130±0.0050),which accords with the whole-rock Rb-Sr isochron age((128.1±3.3) Ma,2σ,MSWD=1.07,Ir=0.7163±0.0052) of the granite-porphyry.It is thus concluded that the rock-forming and ore-forming activities of the Yanbei tin deposit occurred during the early Cretaceous episode,with the mineralization closely related to the post-volcanic high-level emplaced granite-porphyry.
Located in western Wuyi Mountain within Huichang County of Jiangxi Province,the Yanbei tin deposit with rich original topaz is the only large-sized tin deposit so far discovered in the study area.Isotopic chronological study of the tin-bearing granite-porphyry and quartz-topaz-cassiterite veins formed at the early ore-forming stage shows that the quartz-topaz-cassiterite veins have a quartz fluid-inclusion Rb-Sr isochron age of(125.5±6.1) Ma(2σ,MSWD=1.5,Ir=0.7130±0.0050),which accords with the whole-rock Rb-Sr isochron age((128.1±3.3) Ma,2σ,MSWD=1.07,Ir=0.7163±0.0052) of the granite-porphyry.It is thus concluded that the rock-forming and ore-forming activities of the Yanbei tin deposit occurred during the early Cretaceous episode,with the mineralization closely related to the post-volcanic high-level emplaced granite-porphyry.
引文
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Mei Yongwen.1994.Relation between alteration features of Yanbei pore-hyry-type tin deposit and its mineralization.Geology of Jiangxi,8(1):7~13(in Chinese with English abstract).
Rossman G R,Weis D,Wasseburg GJ.1987.Rb,Sr,Nd and Sm,Con-centrations in quartz.Geochim.Cosmo.Acta,51:2325~2329.
Shen Weizhou,Ling Hongfei.1994.Isotopic geochemical characteristicsand material sources of tin-baring granite porphyry in Yanbei andTashan.Acta Geoscientia Sinica,(1~2):117~123(in Chinesewith English abstract).
Shen Weizhou,Wang Dezi,Liu Changshi,Xiong Xiaolin,LaiMingyuan.1996.Characteristics and origin of the Yanbei porphyrytin deposit.Geological Journal of Universities,2(1):85~91(inChinese with English abstract).
Shui Tao.1987.Framework of basement structures in southeastern China.Science in China(B),14(4):414~422(in Chinese with Englishabstract).
Tang Weixin,Zhao Gan.1997.Geological conditions of mineralizationand characteristics of rock and ore-controlling compound structure inYanbei deposit.Geological Science And Technology Of Jiangxi,24(4):151~158(in Chinese with English abstract).
Wang Denghong,Chen Yuchuan,Xu Jue,et al.2005.Cenozoic mineral-ization in China.Beijing:Geol.Publ.House,853(in Chinese).
Wang Dezi,Shen Weizhou,Liu Changshi,Xiong Xiaolin.1994.Geochemi-cal characteristics and origin of the Yanbei volcano-intrusive com-plex in Jiangxi Province.Science in China(B),24(5):531~538(in Chinese).
Xiong Xiaolin,Zhu Jinchu,Liu Changshi,Shen Weizhou.1994.Altera-tion zoning of the Yanbei porphyry tin deposit in Jiangxi Provinceand geochemical characteristics of its main altered rocks.MineralDeposits,13(1):1~10(in Chinese with English abstract).
Xu Keqin,Yin Lin,Sun Mingzhi,Wang Xinguang,Huang Biao.1991.Forming tectonic setting and evolution characteristics of grantoids re-lated to W-Sn-Nb-Ta mineralization in South China.Journal of Nan-jing University(Geosciences),3(1):1~12(in Chinese with Eng-lish abstract).
Zhen Z H,Wang D H,Qu W J,Chen Y C,Wang P A,Xu J X,ZhangJ Q,Xu M L.2006.Geological characteristics and mineralizationage of the Taoxikeng tingesten deposit in Chongyi county,southernJiangxi Province,China.Geological Bulletin of China,25(4):496~501(in Chinese with English abstract).
Zhu Zhengshu.1990.Geological features and mineralization types of theYanbei tin deposit in Huichang County,Jiangxi Province.MineralDeposit,9(4):325~330(in Chinese).
陈毓川,裴荣富,张宏良,等.1989.南岭地区与花岗岩有关的有色、稀有金属矿床地质.北京:地质出版社,1~508.
陈郑辉,王登红,屈文俊,陈毓川,王平安,许建祥,张家箐,许敏林.2006.赣南崇义地区淘锡坑钨矿的地质特征与成矿时代.地质通报,25(4):496~501.
黄常立,唐维新,桂永年,王艳萍,叶景平,项常培.1997.会昌岩背式斑岩锡矿.武汉:中国地质大学出版社,1~95.
李华芹,谢才富,常海亮,等.1998.新疆北部地区有色类金属矿床成矿作用年代学.北京:地质出版社,10~24.
刘昌实,沈渭洲,熊小林,王德滋.1994.江西岩背含锡斑岩主要造岩矿物标型特征.矿物学报,14(1):7~14.
梅勇文.1994.会昌岩背斑岩型锡矿床蚀变特征与成矿关系.江西地质,8(1):7~13.
沈渭洲,凌洪飞.1994.岩背和塌山含锡花岗斑岩的同位素地球化学特征和物质来源.地球学报,(1~2):117~123.
沈渭洲,王德滋,刘昌实,熊小林,赖鸣远.1996.岩背斑岩锡矿特征和成因.高校地质学报,2(1):85~91.
水涛.1987.中国东南大陆基底构造格局.中国科学(B辑),14(4):414~422.
唐维新,赵赣.1997.岩背矿床成矿地质条件及构造复合控岩控矿特征.江西地质科技,24(4):151~158.
王德滋,沈渭洲,刘昌实,熊小林.1994.江西岩背火山侵入杂岩的地球化学特征和成因.中国科学(B辑),24(5):531~538.
王登红,陈毓川,徐珏,邹天人,薛春纪,罗君烈,骆耀南,伍广宇,李志伟,余金杰,闫升好,杨建民,傅旭杰,付小方,傅德明,楚萤石,魏琳,李晓焰.2005.中国新生代成矿作用.北京:地质出版社,853.
熊小林,朱金初,刘昌实,沈渭洲.1994.江西岩背斑岩锡矿蚀变分带及其主要蚀变岩的地球化学特征.矿床地质,13(1):1~10.
徐克勤,尹琳,孙明志,王新光,黄标.1991.华南钨锡铌(钽)稀有金属花岗岩产出的构造地质背景和岩体演化特征.南京大学学报(地球科学),3(1):1~12.
朱正书.1990.江西会昌岩背锡矿床地质特征及矿床类型的划分.矿床地质,9(4):325~330.
Chen Fuwen,Fu Jianming.2005.Geological And Petrochemical Charac-teristics Of Main Mesozoic Tin-Mineralized Granitoids And RegionalMetallogenetic Regularities In Nanling Region.Geology And MineralResources Of South China,(2):12~21(in Chinese with Englishabstract).
Chen Yuchuan,Pei Rongfu,Zhang Hongliang,Lin Xinduo,Bai Ge,LiCongyou.1989.The geology of nonferrous and rare metals relatedwith the Mesozoic granitoid in the Nanling Region.Beijing:Geol.Publ.House,1~508(in Chinese).
Huang Changli,Tang Weixin,Gui Yongnian,Wang Yanping,Ye Jing-ping,Xiang Changpei.1997.Huichang Yanbei-type porphyry tin deposit.Wuhan:China University of Geosciences Press,1~95(inChinese).
Li Huaqin,Xie Caifu,Chang Hailiang,et al.1998.Study on metalloge-netic chronology of nonferrous and precious metallic ore deposits innorth Xinjiang,China.Beijing:Geological Publishing House,10~24(in Chinese with English abstract).
Liu Changshi,Shen Weizhou,Xiong Xiaolin,Wang Dezi.1994.Typo-morphic characteristics of main rock-forming minerals in tin-bearingporphyries,Yanbei,Jiangxi.Acta Mineralogica Sinica,14(1):7~14(in Chinese with English abstract).
Mei Yongwen.1994.Relation between alteration features of Yanbei pore-hyry-type tin deposit and its mineralization.Geology of Jiangxi,8(1):7~13(in Chinese with English abstract).
Rossman G R,Weis D,Wasseburg GJ.1987.Rb,Sr,Nd and Sm,Con-centrations in quartz.Geochim.Cosmo.Acta,51:2325~2329.
Shen Weizhou,Ling Hongfei.1994.Isotopic geochemical characteristicsand material sources of tin-baring granite porphyry in Yanbei andTashan.Acta Geoscientia Sinica,(1~2):117~123(in Chinesewith English abstract).
Shen Weizhou,Wang Dezi,Liu Changshi,Xiong Xiaolin,LaiMingyuan.1996.Characteristics and origin of the Yanbei porphyrytin deposit.Geological Journal of Universities,2(1):85~91(inChinese with English abstract).
Shui Tao.1987.Framework of basement structures in southeastern China.Science in China(B),14(4):414~422(in Chinese with Englishabstract).
Tang Weixin,Zhao Gan.1997.Geological conditions of mineralizationand characteristics of rock and ore-controlling compound structure inYanbei deposit.Geological Science And Technology Of Jiangxi,24(4):151~158(in Chinese with English abstract).
Wang Denghong,Chen Yuchuan,Xu Jue,et al.2005.Cenozoic mineral-ization in China.Beijing:Geol.Publ.House,853(in Chinese).
Wang Dezi,Shen Weizhou,Liu Changshi,Xiong Xiaolin.1994.Geochemi-cal characteristics and origin of the Yanbei volcano-intrusive com-plex in Jiangxi Province.Science in China(B),24(5):531~538(in Chinese).
Xiong Xiaolin,Zhu Jinchu,Liu Changshi,Shen Weizhou.1994.Altera-tion zoning of the Yanbei porphyry tin deposit in Jiangxi Provinceand geochemical characteristics of its main altered rocks.MineralDeposits,13(1):1~10(in Chinese with English abstract).
Xu Keqin,Yin Lin,Sun Mingzhi,Wang Xinguang,Huang Biao.1991.Forming tectonic setting and evolution characteristics of grantoids re-lated to W-Sn-Nb-Ta mineralization in South China.Journal of Nan-jing University(Geosciences),3(1):1~12(in Chinese with Eng-lish abstract).
Zhen Z H,Wang D H,Qu W J,Chen Y C,Wang P A,Xu J X,ZhangJ Q,Xu M L.2006.Geological characteristics and mineralizationage of the Taoxikeng tingesten deposit in Chongyi county,southernJiangxi Province,China.Geological Bulletin of China,25(4):496~501(in Chinese with English abstract).
Zhu Zhengshu.1990.Geological features and mineralization types of theYanbei tin deposit in Huichang County,Jiangxi Province.MineralDeposit,9(4):325~330(in Chinese).
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