华北克拉通北缘狼山西段太古代绿片岩发现及构造意义
摘要
通过对新发现的狼山西段赛乌素绿片岩岩石地球化学特征研究,发现该绿片岩北东东向展布,出露长约20km,厚20～274 m.岩石地球化学成分显示绿片岩w(SiO_2)为48.03%～53.93%,富集轻稀土和不相容元素.原岩恢复显示绿片岩为岛弧玄武岩变质而成,指示当时狼山西段为一活动大陆边缘环境.从绿片岩空间分布与厚度变化推测岛弧活动时间较短,规模有限,这对认识华北克拉通构造组成与属性具有重要意义.
A study was made of the geochemical characteristics of the greenschist unit discovered first by us in the Saiwusu,in western Langshan mountain,north China craton.It was found that the greenschist is NEE trending,its outcrop being about 20 km,and with a thickness of 20～274 m.The geochemistrical measurement showed that its SiO_2 content is 48.03%～53.93%,and that it is rich in light REE and incompatible elements.The protolith recovery showed that the greenschist originated from the metamorphism of arc-island basalt,suggesting that the western Langshan was occupied by an active continental margin at that time,with a special distribution and thickness variation of the greenschist,indicating that the arc-island took place in a short period and in a limited area.This discovery is important for deciphering the formation and attributes of the north China craton.
A study was made of the geochemical characteristics of the greenschist unit discovered first by us in the Saiwusu,in western Langshan mountain,north China craton.It was found that the greenschist is NEE trending,its outcrop being about 20 km,and with a thickness of 20～274 m.The geochemistrical measurement showed that its SiO_2 content is 48.03%～53.93%,and that it is rich in light REE and incompatible elements.The protolith recovery showed that the greenschist originated from the metamorphism of arc-island basalt,suggesting that the western Langshan was occupied by an active continental margin at that time,with a special distribution and thickness variation of the greenschist,indicating that the arc-island took place in a short period and in a limited area.This discovery is important for deciphering the formation and attributes of the north China craton.
引文
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[5]赵国春.华北克拉通基底主要构造单元变质作用演化及其若干问题讨论[J].岩石学报,2009,25(8): 1 772-1 792.
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[11]李江海,牛向龙,KUSKY T,等.从全球对比探讨华北克拉通早期地质演化与板块构造过程[J].地学前缘,2004,11(3):273-283.
[12]李江海,牛向龙,程素华,等.大陆克拉通早期构造演化历史探讨:以华北为例[J].地球科学,2006, 31(3):285-293.
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[14]阎国翰,蔡剑辉,任康绪,等.华北克拉通板内拉张性岩浆作用与三个超大陆裂解及深部地球动力学[J].高校地质学报,2007,13(2):161-174.
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[16]朱日祥,郑天愉.华北克拉通破坏机制与古元古代板块构造体系[J].科学通报,2009,54(14): 1950-1961.
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[18]高山,章军锋,许文良,等.拆沉作用与华北克拉通破坏[J].科学通报,2009,53(14):1 962-1 973.
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[21]MIAO Lai-cheng,ZHANG Fu-qin,FAN Wei-ming, et al.Neoproterozoic zircon inheritance in eastern north China craton(China) mesozoic igneous rocks: derivation from the Yangtze craton and tectonic implications [J].International Geology Review,2011, 53(1):1464-1477.
[22]WEI Lin,PATRICK M,MICHEL F.Cooling paths of the NE China crust during the mesozoic extensional tectonics:example from the south-Liaodong peninsula metamorphic core complex[J].Journal of Asian Earth Sciences,2011,42:1048-1065.
[23]LI Qiu-li,Wu Fu-yuan,LI Xian-hua,et al.Precisely dating paleozoic kimberlites in the north China craton and Hf isotopic constraints on the evolution of the subcontinental lithospheric mantle[J].Lithos, 2011,126:127-134.
[24]邵济安,牟保磊,张履桥.华北东部中生代构造格局转换过程中的深部作用及浅部响应[J].地质论评, 2000,46(1):32-39.
[25]林伟,王清晨,王军,等.辽东半岛晚中生代伸展构造:华北克拉通破坏的地壳响应[J].中国科学D辑:地球科学,2011,41(5):638-653.
[26]陈发景,汪新文.中国中、新生代含油气盆地成因类型、构造体系及地球动力学模式[J].现代地质, 1997,11(4):409-424.
[27]肖荣阁,彭润民,王美娟,等.华北地台北缘西段主要成矿系统分析[J].地球科学,2000,25(4): 362--368.
[28]翟裕生,苗来成,向运川,等.华北克拉通绿岩带型金成矿系统初析[J].地球科学,2009,27(5): 522-531.
[29]陈衍景,郭光军,李欣.华北克拉通花岗绿岩地体中中生代金矿床的成矿地球动力学背景[J].中国科学D辑:地球科学,1998,28(1):35～40.
[30]曹秀兰.华北陆块北缘西段中元古代与裂谷作用有关的铁、稀土、多金属矿床特征及成因[J].前寒武纪研究进展,2002,25(3/4):246-255.
[31]刘仁福,朱作山,李连生,等.内蒙古中部早-中元古代火山岩类岩石的基本特征及铁铜多金属矿床的找矿方向[J].天津地质调查所所报,1983(2): 50-65.
[32]内蒙古自治区地质矿产局.内蒙古自治区区域地质志[M].北京:地质出版社,1991:20～59.
[33]李景春,赵爱林,王力,等.“色尔腾山群”的解体及其原岩特征[J].西北地质,2004,37(1):74-80.
[34]杨海明,苏尚国.内蒙古狼山北侧中元古代变基性岩特征及其成矿意义[J].矿床地质,1992,11(2): 142-153.
[35]王廷印,吴茂炳.阿拉善地区华北板块北部陆源区成矿作用的研究[J].兰州大学学报:自然科学版, 1993,29(4):252-256.
[2]伍家善,耿元生,沈其韩,等.中朝古大陆太古宙地质特征及构造演化[M].北京:地质出版社,1998.
[3]翟明国,卞爱,赵太平.华北克拉通新太古代末超大陆拼合及古元古代末、中元古代裂解[J].中国科学D辑:地球科学,2000,30((增刊):129-137.
[4]赵国春,孙敏.华北克拉通基底构造单元特征及早元古代拼合[J].中国科学D辑:地球科学,2002, 32(7):538-549.
[5]赵国春.华北克拉通基底主要构造单元变质作用演化及其若干问题讨论[J].岩石学报,2009,25(8): 1 772-1 792.
[6]钱祥麟,沈其韩.中国太古宙地质体组成、阶段划分和演化[J].地球学报,1995(2):113-120.
[7]李江海,钱样麟,刘树文,等.华北克拉通早期大陆性质和演化的重要问题[J].地学前缘,1999,6(3): 48.
[8]李江海,钱祥麟,谷永昌.华北克拉通古元古代区域构造格架及其板块构造演化探讨[J].地球科学, 1998,23(3):230-235.
[9]李江海,钱祥麟.华北克拉通新太古代不整合事件的确定及其大陆克拉通构造演化意义[J].中国科学D辑:地球科学,1999,29(1):1-8.
[10]李江海,钱祥麟,黄雄南,等.华北陆块基底构造格局及早期大陆克拉通化过程[J].岩石学报,2000, 16(1):1-10.
[11]李江海,牛向龙,KUSKY T,等.从全球对比探讨华北克拉通早期地质演化与板块构造过程[J].地学前缘,2004,11(3):273-283.
[12]李江海,牛向龙,程素华,等.大陆克拉通早期构造演化历史探讨:以华北为例[J].地球科学,2006, 31(3):285-293.
[13]张福勤,欧阳自远,刘建忠.华北克拉通基底绿岩的岩石大地构造学研究[J].地球物理学报,1998, 41(增刊):99-107.
[14]阎国翰,蔡剑辉,任康绪,等.华北克拉通板内拉张性岩浆作用与三个超大陆裂解及深部地球动力学[J].高校地质学报,2007,13(2):161-174.
[15]翟明国,朱日祥,刘建明,等.华北东部中生代构造体制转折的关键时限[J].中国科学D辑:地球科学, 2003,33(10):913-920.
[16]朱日祥,郑天愉.华北克拉通破坏机制与古元古代板块构造体系[J].科学通报,2009,54(14): 1950-1961.
[17]吴福元,徐义刚,高山,等.华北岩石圈减薄与克拉通破坏研究的主要学术争论[J].岩石学报,2008, 24(6):1145-1174.
[18]高山,章军锋,许文良,等.拆沉作用与华北克拉通破坏[J].科学通报,2009,53(14):1 962-1 973.
[19]高山,张本仁,金振民.秦岭-大别造山带下地壳拆沉作用[J].中国科学D辑:地球科学,1999,29(6): 532-541.
[20]KUSKY T M,WINDLEY B F,ZHAI M G.Tectonic evolution of the north China block:from orogen to craton to orogen[M]//ZHAI M G,Windley B F, Kusky T M,et al.London:Geological Society of London Special Publication,2007:1-34.
[21]MIAO Lai-cheng,ZHANG Fu-qin,FAN Wei-ming, et al.Neoproterozoic zircon inheritance in eastern north China craton(China) mesozoic igneous rocks: derivation from the Yangtze craton and tectonic implications [J].International Geology Review,2011, 53(1):1464-1477.
[22]WEI Lin,PATRICK M,MICHEL F.Cooling paths of the NE China crust during the mesozoic extensional tectonics:example from the south-Liaodong peninsula metamorphic core complex[J].Journal of Asian Earth Sciences,2011,42:1048-1065.
[23]LI Qiu-li,Wu Fu-yuan,LI Xian-hua,et al.Precisely dating paleozoic kimberlites in the north China craton and Hf isotopic constraints on the evolution of the subcontinental lithospheric mantle[J].Lithos, 2011,126:127-134.
[24]邵济安,牟保磊,张履桥.华北东部中生代构造格局转换过程中的深部作用及浅部响应[J].地质论评, 2000,46(1):32-39.
[25]林伟,王清晨,王军,等.辽东半岛晚中生代伸展构造:华北克拉通破坏的地壳响应[J].中国科学D辑:地球科学,2011,41(5):638-653.
[26]陈发景,汪新文.中国中、新生代含油气盆地成因类型、构造体系及地球动力学模式[J].现代地质, 1997,11(4):409-424.
[27]肖荣阁,彭润民,王美娟,等.华北地台北缘西段主要成矿系统分析[J].地球科学,2000,25(4): 362--368.
[28]翟裕生,苗来成,向运川,等.华北克拉通绿岩带型金成矿系统初析[J].地球科学,2009,27(5): 522-531.
[29]陈衍景,郭光军,李欣.华北克拉通花岗绿岩地体中中生代金矿床的成矿地球动力学背景[J].中国科学D辑:地球科学,1998,28(1):35～40.
[30]曹秀兰.华北陆块北缘西段中元古代与裂谷作用有关的铁、稀土、多金属矿床特征及成因[J].前寒武纪研究进展,2002,25(3/4):246-255.
[31]刘仁福,朱作山,李连生,等.内蒙古中部早-中元古代火山岩类岩石的基本特征及铁铜多金属矿床的找矿方向[J].天津地质调查所所报,1983(2): 50-65.
[32]内蒙古自治区地质矿产局.内蒙古自治区区域地质志[M].北京:地质出版社,1991:20～59.
[33]李景春,赵爱林,王力,等.“色尔腾山群”的解体及其原岩特征[J].西北地质,2004,37(1):74-80.
[34]杨海明,苏尚国.内蒙古狼山北侧中元古代变基性岩特征及其成矿意义[J].矿床地质,1992,11(2): 142-153.
[35]王廷印,吴茂炳.阿拉善地区华北板块北部陆源区成矿作用的研究[J].兰州大学学报:自然科学版, 1993,29(4):252-256.
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