华北克拉通1.8Ga镁铁质岩墙群的地球化学特征及其地质意义:以晋冀蒙交界地区为例

彭澎 翟明国 张华锋 赵太平 倪志耀. 华北克拉通1.8Ga镁铁质岩墙群的地球化学特征及其地质意义:以晋冀蒙交界地区为例[J]. 岩石学报, 2004, 20(3): 439-456.
引用本文: 彭澎 翟明国 张华锋 赵太平 倪志耀. 华北克拉通1.8Ga镁铁质岩墙群的地球化学特征及其地质意义:以晋冀蒙交界地区为例[J]. 岩石学报, 2004, 20(3): 439-456.
PENG Peng,ZHAI MingGuo,ZHANG HuaFeng,ZHA0 TaiPing,NI ZhiYao Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou 510640,China College of Earth Sciences,Chengdu University of Technology,Chengdu 610059,China. Geochemistry and geological significance of the 1.8 Ga mafic dyke swarms in the North China Craton: an example from the juncture of Shanxi,Hebei and Inner Mongolia[J]. Acta Petrologica Sinica, 2004, 20(3): 439-456.
Citation: PENG Peng,ZHAI MingGuo,ZHANG HuaFeng,ZHA0 TaiPing,NI ZhiYao Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou 510640,China College of Earth Sciences,Chengdu University of Technology,Chengdu 610059,China. Geochemistry and geological significance of the 1.8 Ga mafic dyke swarms in the North China Craton: an example from the juncture of Shanxi,Hebei and Inner Mongolia[J]. Acta Petrologica Sinica, 2004, 20(3): 439-456.

华北克拉通1.8Ga镁铁质岩墙群的地球化学特征及其地质意义:以晋冀蒙交界地区为例

  • 基金项目:

    国家自然科学重点基金(编号:40234050),中国科学院重大创新项目(编号:KZCX1-07)资助

Geochemistry and geological significance of the 1.8 Ga mafic dyke swarms in the North China Craton: an example from the juncture of Shanxi,Hebei and Inner Mongolia

  • 华北克拉通1.8Ga镁铁质岩墙群是我国规模最大的岩墙群之一。在晋冀蒙交界地区,岩墙群表现为NNW和EW向近直立具有冷凝边结构的岩墙,它们产出于统一构造体制之下。单条岩墙的长度达几十公里,宽度0.5~100m,通常20m左右。可以根据岩墙产状和岩石地球化学特征将这些岩墙群分成三组,简记为S-Ⅰ、S-Ⅱ和S-EW,分别对应两组NNW向和一组EW向的岩墙群。岩墙的主要造岩矿物为单斜辉石和斜长石,其它矿物包括角闪石、Fe-Ti氧化物、黑云母、磷灰石、碱性长石和石英。S-Ⅱ能见到橄榄石斑晶及围绕橄榄石和单斜辉石颗粒生长的斜方辉石和角闪石反应边结构,以及斜长石正环带结构。S-Ⅰ相对低FeO(全)-TiO2-P2O5,成分为相对高MgO拉斑玄武岩,而S-Ⅱ高FeO(全)-TiO2-P2O5,由碱性到亚碱性高Fe玄武岩组成。S-EW包括高Fe拉斑玄武岩和安山岩。所有岩墙稀土总量(YREE)和轻稀土含量(LREE)较高。它们相对富集Ba、K和P,并且亏损Nb和Ta。S-Ⅱ和EW相对亏损Sr。分析表明,S-Ⅰ表现为不同程度部分熔融的特征,内部又有一定的分离结晶作用和地壳混染过程。S-Ⅱ表现为富铁贫硅(Fenner趋势)的分离结晶作用和明显的地壳混染,而S-EW表现为富硅贫铁(Bowen趋势)的演化过程,也有明显的地壳混染。我们认为岩墙群涉及两个或多个源区,可能是地幔柱背景下大陆伸展裂解的产物。
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