| 东北及邻区晚古生代地层接触关系与佳-蒙地块的形成和演化 |
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| 引用本文： | 李宁,王成文.东北及邻区晚古生代地层接触关系与佳-蒙地块的形成和演化[J].吉林大学学报(地球科学版),2017(5):1331-1340. |
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| 作者姓名： | 李宁 王成文 |
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| 作者单位： | 吉林大学地球科学学院,长春,130061 |
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| 基金项目： | 高等学校博士学科点专项科研基金项目，国家自然科学基金项目，Supported by the Doctoral Foundation of Ministry of Education of China，National Natural Science Foundation of China |
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| 摘 要： | 东北及邻区晚古生界及其相关地层间的接触关系含有丰富的大地构造信息,本文系统梳理了这些资料,用以阐述佳-蒙地块的形成与演化。佳-蒙地块南缘的西别河组、北缘的卧都河组及东缘的黑台组等晚志留世—早泥盆世地层底部均发育不整合(或非整合),揭示了东北地区曾经历了一次十分重要的大地构造运动,标志着佳-蒙地块的形成。区内泥盆纪—石炭纪和石炭纪—二叠纪地层之间多为整合接触,说明这一时期佳-蒙地块处于稳定沉降接受沉积阶段。佳-蒙地块南缘晚二叠世林西组底部的平行不整合界面及其上部的磨拉石建造,以及中—晚二叠世地层序列由海相向陆相的转化,表明林西组处于前陆盆地的沉积环境,标志着佳-蒙地块与华北板块发生碰撞拼合。佳-蒙地块南缘早三叠世卢家屯组底部的不整合及卢家屯组下部砾岩所具有的磨拉石建造特征,说明碰撞造山作用仍在持续进行,属于递进造山作用。晚三叠世大酱缸组底部的不整合,说明造山作用已经完成,佳-蒙地块独立发展的历程结束。
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| 关 键 词： | 晚古生代 地层接触关系 整合 不整合 佳-蒙地决 华北板块 |
Formation and Evolution of Jiamusi-Mongolia Block and Contact Relationship of Late Paleozoic Strata in Northeast China and Adjacent Region |
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| Abstract: | On Jiamusi-Mongolia block,the contact relationship of Late Paleozoic and related strata contains abundant tectonic information.We systematically combed these data and discussed the formation and evolution of Jiamusi-Mongolia block.The angle unconformities can be found under Xibiehe Formation on the southern margin of Jiamusi-Mongolia block,Woduhe Formation on the northern margin,and Heitai Formation on the eastern margin.These angle unconformities under the Late Silurian-Early Devonian strata reveal a significant tectonic movement,indicating that the Jiamusi-Mongolia block was formed in Late Silurian-Early Devonian.The contact relationship between the strata of Devonian,Carboniferous and Permian are all conformable,which manifests a stable subsidence period during Devonian-Permian on the Jiamusi-Mongolia block.The parallel unconformities under the bottom of the Late Permian Linxi Formation and under the bottom of the Early Triassic Lujiatun Formation are the significant mark of the collision and collage between Jiamusi-Mongolia block and North China plate.The parallel unconformity surface,the above Molasse Formation,and the stratigraphic sequence change from marine to continent during Middle-Late Permian indicaite a foreland basin sedimentary environment of Linxi Formation.The angle unconformity under the bottom of Lujiatun Formation and the characteristics of Molasse Formation in conglomerate indicate a continuous progressive orogeny.The angle unconformity under the bottom of Late Triassic Dajianggang Formation indicates the end of the orogeny and the development of Jiamusi-Mongolia block as an independent block. |
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| Keywords: | Late Paleozoic contact relationship of strata conformity unconformity Jiamusi-Mongolia block North China plate |
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