湘东北井冲钴铜矿区连云山花岗岩的岩石成因——锆石U-Pb年龄、岩石地球化学和Hf同位素约束
|
摘要
对湘东北井冲钴铜矿区连云山细粒二云母二长花岗岩和中细粒黑云母花岗闪长岩进行了锆石U-Pb年代学、岩石地球化学和Hf同位素分析研究。LA-ICP-MS锆石U-Pb定年结果表明,花岗岩的成岩年龄为149. 4±1. 1Ma。岩石属强过铝质高钾钙碱性-钙碱性系列,富集Th、U、Pb等元素,亏损Nb、Ta、Zr、Ti等元素,稀土元素球粒陨石标准化配分模式为右倾型,Eu表现为强烈到弱亏损。岩石中燕山期锆石176Hf/177Hf值为0. 282 314～0. 282 461,εHf(t)值为-13. 0～-7. 8,Hf同位素二阶段模式年龄在2 018～1 690 Ma之间。综合分析结果显示,岩石来源于下地壳岩石部分熔融。
In this paper, the authors studied the zircon U-Pb isotope chronology, whole rock geochemistry and Hf isotopes of the fine-grained two-mica monzonitic granite and medium fine-grained biotite granodiorite of the Lianyunshan granite from the Jingchong Co-Cu polymetallic deposit in northeastern Hunan Province. LA-ICP-MS zircon UPb dating yielded crystallization ages of 149. 4 ± 1. 1 Ma for the fine-grained two-mica monzonitic granite of the Lianyunshan granite. The rocks belong to a peraluminous high-Al calc-alkaline intrusive granite. These rocks are characterized by high Th, U and Pb content and low Nb, Ta, Zr and Ti content. The REE distribution patterns show the right-inclined type, with strongly negative Eu anomalies to weakly negative Eu anomalies. The Hf isotope analytical results show that the176Hf/177 Hf values of the Yanshanian zircons are between 0. 282 314 and 0. 282 461,whereas the εHf(t) values of the late Yanshanian zircons are between-13. 0 and-7. 8, with the two stage Hf model ages ranging from 2 018 to 1 690 Ma, which indicates that its parental magma was derived from partial melting of rocks of ancient crust.
In this paper, the authors studied the zircon U-Pb isotope chronology, whole rock geochemistry and Hf isotopes of the fine-grained two-mica monzonitic granite and medium fine-grained biotite granodiorite of the Lianyunshan granite from the Jingchong Co-Cu polymetallic deposit in northeastern Hunan Province. LA-ICP-MS zircon UPb dating yielded crystallization ages of 149. 4 ± 1. 1 Ma for the fine-grained two-mica monzonitic granite of the Lianyunshan granite. The rocks belong to a peraluminous high-Al calc-alkaline intrusive granite. These rocks are characterized by high Th, U and Pb content and low Nb, Ta, Zr and Ti content. The REE distribution patterns show the right-inclined type, with strongly negative Eu anomalies to weakly negative Eu anomalies. The Hf isotope analytical results show that the176Hf/177 Hf values of the Yanshanian zircons are between 0. 282 314 and 0. 282 461,whereas the εHf(t) values of the late Yanshanian zircons are between-13. 0 and-7. 8, with the two stage Hf model ages ranging from 2 018 to 1 690 Ma, which indicates that its parental magma was derived from partial melting of rocks of ancient crust.
引文
Cherniak D J and Watson E B.2000.Pb diffusion in zircon[J].Chemical Geology,172:5~24.
Fu Jianming,Ma Changqian,Xie Caifu,et al.2004a.Zircon SHRIMPdating of the Cailing granite on the eastern margin of the Qitianling granite,Hunan,South China,and its significance[J].Geology in China,33(1):96~100(in Chinese with English abstract).
Fu Jianming,Ma Changqian,Xie Caifu,et al.2004b.SHRIMP U-Pb zircon dating of the Jiuyishan composite granite in Hunan and its geological significance[J].Geotectonica et Metallogenia,28(4):370~378(in Chinese with English abstract).
Hu Junliang,Xu Dengming,Zhang Kun,et al.2015.Zircon U-Pb dating,Hf isotope of magmatic rocks from Qibaoshan Cu polymetallic deposit,Hunan Province[J].Geology and Mineral Resources of South China,(3):236~245(in chinese with English abstract).
Hunan Institute of Geology.1995.Division of granite unit super unit in Hunan province and its metallogenic specialization[J].Hunan Geology,8:1~59(in Chinese with English abstract).
Irvine T N and Baragar W R A.1971.A guide to chemical classification classification of the common volcanic rocks[J].Canadian Journal of Earth Sciences,8:532~548.
Wang J Q,Shu L S and Santosh M.2016.Petrogenesis and tectonic evolution of Lianyunshan complex,South China:Insights on Neoproterozoic and late Mesozoic tectonic evolution of the central Jiangnan Orogen[J].Gondwana Research,(39):114~130.
Le Fort P,Cuney M,Deniel C,et al.1987.Crustal genetation of the Himalayan leucogranites[J].Tectonophysics,134:39~57.
Zeng L S,Gao L E,Xie K J,et al.2011.Mid-Eocene high Sr/Y granites in the Northern Himalayan Gneiss Domes:Melting thickened lower continental crust[J].Earth and Planetary Science Letters,303:251~266.
Liu Y S,Gao S,Hu Z C,et al.2010.Continental and oceanic crust recycling-induced melt-peridotite interactions in the Trans-North China Orogen:U-Pb dating,Hf isotopes and trace elements in zircons of mantle xenoliths[J].Journal of Petrology,51(1&2):537~571.
Liu Y S,Hu Z C,Gao S,et al.2008.In situ analysis of major and trace elements of anhydrous minerals by LA-ICP-MS without applying an internal standard[J].Chemical Geology,257(1~2):34~43.
Lu Yuanfa.2004.Geo Kit-A geochemical toolkit for Microsoft Excel[J].Geochimica,33(5):459~464(in Chinese with English abstract).
Ludwig K R.2003.ISOPLOT 3.00:A Geochronological Toolkit for Microsoft Excel[J].Berkeley Geochronology Center,California,Berkeley,39.
Ma Tieqiu,Bo Daoyuan,Kuang Jun,et al.2005.Zircon SHRIMP dating of the Xitian granite pluton,Chaling,southeastern Hunan,and its geological significance[J].Geologcal Bulletin of China,24(5):415~419(in Chinese with English abstract).
Mao Jingwen,Chen Maohong,Yuan Shunda,et al.2011.Geological characteristics of the Qinhang(or Shihang)metallogenic belt in South China and spatial-temporal distribution regularity of mineral deposits[J].Acta Geologica Sinica,85(5):636~658(in Chinese with English abstract).
Middlemost E A K.1994.Naming materials in the magma/igneous rock system[J].Earth Sci.Rev.,37:15~224.
Pearce J A,Harris N B and Tindle A G.1984.Trace element discrimination diagrams for the tectonic interpretation of granitic rocks[J].Journal of Petrology,25(4):956~983.
Peceerillo R and Taylor S R.1976.Geochemistry of Eocene calcalkaline volcanic rocks from the Kastamonu area,northern Turkey[J].Contrib.Mineral.Petrol.,58:63~81.
Shu Liangshu and Zhou Xinmin.2002.Late Mesozoic Tectonism of Southeast China[J].Geological Review,48(3):249~260(in Chinese with English abstract).
Deng T,Xu D R,Chi G X,et al.2017.Geology,geochronology,geochemistry and ore genesis of the Wangu gold deposit in northeastern Hunan Province,Jiangnan Orogen,South China[J].Ore Geology Reviews,(88):619~637.
White A J R and Chappell B W.1983.Granitoid types and their distribution in the lachlan fold belt,south-eastern Austalia[J].Geological Society of American Membership,159:21~34.
Wu Fuyuan,Li Xianhua,Zheng Yongfei,et al.2007.Lu-Hf isotopic systematics and their applications in petrology[J].Acta Petrologica Sinica,23(2):185~220(in Chinese with English abstract).
Wu Yuanbao and Zheng Yongfei.2004.Zircon genetic mineralogy and its constraints on U-Pb age interpretation[J].Chinese Science Bulletin,49(16):1 589~1 604(in Chinese with English abstract).
Xu Deming,Lin Zhiyong,Long Wenguo,et al.2012.Research history and current situation of Qinzhou-Hangzhou Metallogenic Belt,South China[J].Geology and Mineral Resources of South China,28(4):277~289(in Chinese with English abstract).
Xu Deming,Lin Zhiyong,Luo Xuequan,et al.2015.Metallogenetic series of major metallic deposits in the Qinzhou-Hangzhou metallogenic belt[J].Earth Science Frontiers,22(2):7~24(in Chinese with English abstract).
Xu Deru,Deng Teng,Dong Guojun,et al.2017.Zircon U-Pb geochronological and geochemical characteristics of the Lianyunshan two-mica monzogranites in northeastern Hunan Province:Implications for petrogenesis and tectonic setting associated with poly-metallic mineralization[J].Earth Science Frontiers,24(2):104~122(in Chinese with English abstract).
Xu Ping,Wu Fuyuan,Xie Liewen,et al.2004.Hf isotopes of standard zircon dating from U-Pb isotopes[J].Chinese Science Bulletin,49:1 403~1 410(in Chinese with English abstract).
Yang Minggui and Mei Yongwen.1997.Characteristics of geology and metatllization in the Qinzhou-Hangzhou paleoplate juncture[J].Geology and Mineral Resources of South China,(3):52~59(in Chinese with English abstract).
Yi Zushui,Luo Xiaoya,Zhou Donghong,et al.2010.Geological characteristics and genesis of Jinchong Co-Cu polymetal deposit,Liuyang,Hunan Province[J].Geology and Mineral Resources of South China,3:12~18(in Chinese with English abstract).
Yuan H L,Gao S,Dai M N,et al.2008.Simultaneous determinations of U-Pb age,Hf isotopes and trace element compositions of zircon by excimer laser ablation quadrupole and multiple collector ICP-MS[J].Chem.Geol.,247:100~118.
Zhang Qi,Li Chengdong,Wang Yan,et al.2005.Mesozoic high-Sr and low-Yb granitoids and low-Sr and high-Yb granitoids in eastern China:Comparison and geological implications[J].Acta Petrologica Sinica,21(6):1 527~1 537(in Chinese with English abstract).
Zhang Qi,Li Chengdong,Wang Yan,et al.2006.A granite classification based on pressures[J].Geologcal Bulletin of China,25(11):1 274~1 278(in Chinese with English abstract).
付建明,马昌前,谢才富,等.2004a.湖南骑田岭岩体东缘菜岭岩体的锆石SHRIMP定年及其意义[J].中国地质,33(1):96~100.
付建明,马昌前,谢才富,等.2004b.湖南九嶷山复式花岗岩体SHRIMP锆石定年及其地质意义[J].大地构造与成矿学,28(4):370~378.
胡俊良,徐德明,张鲲.2015.湖南七宝山矿床石英斑岩锆石U-Pb定年及Hf同位素地球化学[J].华南地质与矿产,(3):236~245.
湖南地质研究所.1995.湖南省花岗岩单元-超单元划分及其成矿专属性[J].湖南地质,8:1~59.
路远发.2004.Geokit:一个用VBA构建的地球化学工具软件包[J].地球化学,33(5):459~464.
马铁球,柏道远,邝军,等.2005.湘东南茶陵地区锡田岩体锆石SHRIMP定年及其地质意义[J].地质通报,24(5):415~419.
毛景文,陈懋弘,袁顺达,等.2011.华南地区钦杭成矿带地质特征和矿床时空分布规律[J].地质学报,85(5):636~658.
舒良树,周新民.2002.中国东南部晚中生代构造作用[J].地质论评,48(3):249~260.
吴福元,李献华,郑永飞,等.2007.Lu-Hf同位素体系及其岩石学应用[J].岩石学报,23(2):185~220.
吴元保,郑永飞.2004.锆石成因矿物学研究及其对U-Pb年龄解释的制约[J].科学通报,49(16):1 589~1 604.
徐德明,蔺志永,龙文国,等.2012.钦杭成矿带的研究历史和现状[J].华南地质与矿产,28(4):277~289.
徐德明,蔺志永,骆学全,等.2015.钦-杭成矿带主要金属矿床成矿系列[J].地学前缘,22(2):7~24.
徐平,吴福元,谢烈文,等.2004.U-Pb同位素定年标准锆石的Hf同位素[J].科学通报,49:1 403~1 410.
许德如,邓腾,董国军,等.2017.湘东北连云山二云母二长花岗岩的年代学和地球化学特征:对岩浆成因和成矿地球动力学背景的启示[J].地学前缘,24(2):104~122.
杨明桂,梅勇文.1997.钦-杭古板块结合带与成矿带的主要特征[J].华南地质与矿产,(3):52~59.
易祖水,罗小亚,周东红,等.2010.浏阳市井冲钴铜多金属矿床地质特征及成因浅析[J].华南地质与矿产,3:12~18.
曾令森,高利娥.2017.喜马拉雅碰撞造山带新生代地壳深熔作用与淡色花岗岩[J].岩石学报,33(5):1 420~1 444.
张旗,李承东,王焰,等.2005.中国东部中生代高Sr低Yb和低Sr高Yb型花岗岩:对比及其地质意义[J].岩石学报,21(6):1 527~1 537.
张旗,王焰,李承东,等.2006.花岗岩按照压力的分类[J].地质通报,25(11):1 274~1 278.
(1)彭和求,陈俊,何江南,等. 2004. 1∶5万泮春-官渡幅区域地质调查报告.
(2)贾宝华,彭和求,陈俊,等. 2003. 1∶25万长沙市幅区域地质调查报告.
(3)赵小明,张开明,毛新武,等. 2013.中南地区矿产资源潜力评价成矿地质背景研究报告.
(1)彭和求,陈俊,何江南,等. 2004. 1∶5万泮春-官渡幅区域地质调查报告.
(1)彭和求,陈俊,何江南,等. 2004. 1∶5万泮春-官渡幅区域地质调查报告.
Fu Jianming,Ma Changqian,Xie Caifu,et al.2004a.Zircon SHRIMPdating of the Cailing granite on the eastern margin of the Qitianling granite,Hunan,South China,and its significance[J].Geology in China,33(1):96~100(in Chinese with English abstract).
Fu Jianming,Ma Changqian,Xie Caifu,et al.2004b.SHRIMP U-Pb zircon dating of the Jiuyishan composite granite in Hunan and its geological significance[J].Geotectonica et Metallogenia,28(4):370~378(in Chinese with English abstract).
Hu Junliang,Xu Dengming,Zhang Kun,et al.2015.Zircon U-Pb dating,Hf isotope of magmatic rocks from Qibaoshan Cu polymetallic deposit,Hunan Province[J].Geology and Mineral Resources of South China,(3):236~245(in chinese with English abstract).
Hunan Institute of Geology.1995.Division of granite unit super unit in Hunan province and its metallogenic specialization[J].Hunan Geology,8:1~59(in Chinese with English abstract).
Irvine T N and Baragar W R A.1971.A guide to chemical classification classification of the common volcanic rocks[J].Canadian Journal of Earth Sciences,8:532~548.
Wang J Q,Shu L S and Santosh M.2016.Petrogenesis and tectonic evolution of Lianyunshan complex,South China:Insights on Neoproterozoic and late Mesozoic tectonic evolution of the central Jiangnan Orogen[J].Gondwana Research,(39):114~130.
Le Fort P,Cuney M,Deniel C,et al.1987.Crustal genetation of the Himalayan leucogranites[J].Tectonophysics,134:39~57.
Zeng L S,Gao L E,Xie K J,et al.2011.Mid-Eocene high Sr/Y granites in the Northern Himalayan Gneiss Domes:Melting thickened lower continental crust[J].Earth and Planetary Science Letters,303:251~266.
Liu Y S,Gao S,Hu Z C,et al.2010.Continental and oceanic crust recycling-induced melt-peridotite interactions in the Trans-North China Orogen:U-Pb dating,Hf isotopes and trace elements in zircons of mantle xenoliths[J].Journal of Petrology,51(1&2):537~571.
Liu Y S,Hu Z C,Gao S,et al.2008.In situ analysis of major and trace elements of anhydrous minerals by LA-ICP-MS without applying an internal standard[J].Chemical Geology,257(1~2):34~43.
Lu Yuanfa.2004.Geo Kit-A geochemical toolkit for Microsoft Excel[J].Geochimica,33(5):459~464(in Chinese with English abstract).
Ludwig K R.2003.ISOPLOT 3.00:A Geochronological Toolkit for Microsoft Excel[J].Berkeley Geochronology Center,California,Berkeley,39.
Ma Tieqiu,Bo Daoyuan,Kuang Jun,et al.2005.Zircon SHRIMP dating of the Xitian granite pluton,Chaling,southeastern Hunan,and its geological significance[J].Geologcal Bulletin of China,24(5):415~419(in Chinese with English abstract).
Mao Jingwen,Chen Maohong,Yuan Shunda,et al.2011.Geological characteristics of the Qinhang(or Shihang)metallogenic belt in South China and spatial-temporal distribution regularity of mineral deposits[J].Acta Geologica Sinica,85(5):636~658(in Chinese with English abstract).
Middlemost E A K.1994.Naming materials in the magma/igneous rock system[J].Earth Sci.Rev.,37:15~224.
Pearce J A,Harris N B and Tindle A G.1984.Trace element discrimination diagrams for the tectonic interpretation of granitic rocks[J].Journal of Petrology,25(4):956~983.
Peceerillo R and Taylor S R.1976.Geochemistry of Eocene calcalkaline volcanic rocks from the Kastamonu area,northern Turkey[J].Contrib.Mineral.Petrol.,58:63~81.
Shu Liangshu and Zhou Xinmin.2002.Late Mesozoic Tectonism of Southeast China[J].Geological Review,48(3):249~260(in Chinese with English abstract).
Deng T,Xu D R,Chi G X,et al.2017.Geology,geochronology,geochemistry and ore genesis of the Wangu gold deposit in northeastern Hunan Province,Jiangnan Orogen,South China[J].Ore Geology Reviews,(88):619~637.
White A J R and Chappell B W.1983.Granitoid types and their distribution in the lachlan fold belt,south-eastern Austalia[J].Geological Society of American Membership,159:21~34.
Wu Fuyuan,Li Xianhua,Zheng Yongfei,et al.2007.Lu-Hf isotopic systematics and their applications in petrology[J].Acta Petrologica Sinica,23(2):185~220(in Chinese with English abstract).
Wu Yuanbao and Zheng Yongfei.2004.Zircon genetic mineralogy and its constraints on U-Pb age interpretation[J].Chinese Science Bulletin,49(16):1 589~1 604(in Chinese with English abstract).
Xu Deming,Lin Zhiyong,Long Wenguo,et al.2012.Research history and current situation of Qinzhou-Hangzhou Metallogenic Belt,South China[J].Geology and Mineral Resources of South China,28(4):277~289(in Chinese with English abstract).
Xu Deming,Lin Zhiyong,Luo Xuequan,et al.2015.Metallogenetic series of major metallic deposits in the Qinzhou-Hangzhou metallogenic belt[J].Earth Science Frontiers,22(2):7~24(in Chinese with English abstract).
Xu Deru,Deng Teng,Dong Guojun,et al.2017.Zircon U-Pb geochronological and geochemical characteristics of the Lianyunshan two-mica monzogranites in northeastern Hunan Province:Implications for petrogenesis and tectonic setting associated with poly-metallic mineralization[J].Earth Science Frontiers,24(2):104~122(in Chinese with English abstract).
Xu Ping,Wu Fuyuan,Xie Liewen,et al.2004.Hf isotopes of standard zircon dating from U-Pb isotopes[J].Chinese Science Bulletin,49:1 403~1 410(in Chinese with English abstract).
Yang Minggui and Mei Yongwen.1997.Characteristics of geology and metatllization in the Qinzhou-Hangzhou paleoplate juncture[J].Geology and Mineral Resources of South China,(3):52~59(in Chinese with English abstract).
Yi Zushui,Luo Xiaoya,Zhou Donghong,et al.2010.Geological characteristics and genesis of Jinchong Co-Cu polymetal deposit,Liuyang,Hunan Province[J].Geology and Mineral Resources of South China,3:12~18(in Chinese with English abstract).
Yuan H L,Gao S,Dai M N,et al.2008.Simultaneous determinations of U-Pb age,Hf isotopes and trace element compositions of zircon by excimer laser ablation quadrupole and multiple collector ICP-MS[J].Chem.Geol.,247:100~118.
Zhang Qi,Li Chengdong,Wang Yan,et al.2005.Mesozoic high-Sr and low-Yb granitoids and low-Sr and high-Yb granitoids in eastern China:Comparison and geological implications[J].Acta Petrologica Sinica,21(6):1 527~1 537(in Chinese with English abstract).
Zhang Qi,Li Chengdong,Wang Yan,et al.2006.A granite classification based on pressures[J].Geologcal Bulletin of China,25(11):1 274~1 278(in Chinese with English abstract).
付建明,马昌前,谢才富,等.2004a.湖南骑田岭岩体东缘菜岭岩体的锆石SHRIMP定年及其意义[J].中国地质,33(1):96~100.
付建明,马昌前,谢才富,等.2004b.湖南九嶷山复式花岗岩体SHRIMP锆石定年及其地质意义[J].大地构造与成矿学,28(4):370~378.
胡俊良,徐德明,张鲲.2015.湖南七宝山矿床石英斑岩锆石U-Pb定年及Hf同位素地球化学[J].华南地质与矿产,(3):236~245.
湖南地质研究所.1995.湖南省花岗岩单元-超单元划分及其成矿专属性[J].湖南地质,8:1~59.
路远发.2004.Geokit:一个用VBA构建的地球化学工具软件包[J].地球化学,33(5):459~464.
马铁球,柏道远,邝军,等.2005.湘东南茶陵地区锡田岩体锆石SHRIMP定年及其地质意义[J].地质通报,24(5):415~419.
毛景文,陈懋弘,袁顺达,等.2011.华南地区钦杭成矿带地质特征和矿床时空分布规律[J].地质学报,85(5):636~658.
舒良树,周新民.2002.中国东南部晚中生代构造作用[J].地质论评,48(3):249~260.
吴福元,李献华,郑永飞,等.2007.Lu-Hf同位素体系及其岩石学应用[J].岩石学报,23(2):185~220.
吴元保,郑永飞.2004.锆石成因矿物学研究及其对U-Pb年龄解释的制约[J].科学通报,49(16):1 589~1 604.
徐德明,蔺志永,龙文国,等.2012.钦杭成矿带的研究历史和现状[J].华南地质与矿产,28(4):277~289.
徐德明,蔺志永,骆学全,等.2015.钦-杭成矿带主要金属矿床成矿系列[J].地学前缘,22(2):7~24.
徐平,吴福元,谢烈文,等.2004.U-Pb同位素定年标准锆石的Hf同位素[J].科学通报,49:1 403~1 410.
许德如,邓腾,董国军,等.2017.湘东北连云山二云母二长花岗岩的年代学和地球化学特征:对岩浆成因和成矿地球动力学背景的启示[J].地学前缘,24(2):104~122.
杨明桂,梅勇文.1997.钦-杭古板块结合带与成矿带的主要特征[J].华南地质与矿产,(3):52~59.
易祖水,罗小亚,周东红,等.2010.浏阳市井冲钴铜多金属矿床地质特征及成因浅析[J].华南地质与矿产,3:12~18.
曾令森,高利娥.2017.喜马拉雅碰撞造山带新生代地壳深熔作用与淡色花岗岩[J].岩石学报,33(5):1 420~1 444.
张旗,李承东,王焰,等.2005.中国东部中生代高Sr低Yb和低Sr高Yb型花岗岩:对比及其地质意义[J].岩石学报,21(6):1 527~1 537.
张旗,王焰,李承东,等.2006.花岗岩按照压力的分类[J].地质通报,25(11):1 274~1 278.
(1)彭和求,陈俊,何江南,等. 2004. 1∶5万泮春-官渡幅区域地质调查报告.
(2)贾宝华,彭和求,陈俊,等. 2003. 1∶25万长沙市幅区域地质调查报告.
(3)赵小明,张开明,毛新武,等. 2013.中南地区矿产资源潜力评价成矿地质背景研究报告.
(1)彭和求,陈俊,何江南,等. 2004. 1∶5万泮春-官渡幅区域地质调查报告.
(1)彭和求,陈俊,何江南,等. 2004. 1∶5万泮春-官渡幅区域地质调查报告.