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
发布时间：2018-07-28 18:24
【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。
[Abstract]:The contact relationship between the late Paleozoic and its related strata in Northeast China and its adjacent areas contains abundant tectonic information. This paper systematically combs these data to illustrate the formation and evolution of the Jia-Meng block. Xibeihe formation in the southern margin of Jia-Meng massif, The late Silurian and early Devonian strata in the northern margin of the Wuduhe formation and the eastern margin of the Heitai formation are unconformable (or unconformable) at the bottom of the strata, which reveals that the Northeast area has experienced a very important tectonic movement, indicating the formation of the Jia-Meng block. Most of the Devonian Carboniferous and Carboniferous Permian strata are integrated contacts, indicating that the Jia-Meng block is in stable subsidence and accepting sedimentary stage in this period. The parallel unconformities at the bottom of the late Permian Linxi formation in the southern margin of the Jia-Meng block and its upper Molarasite formation, as well as the transformation of the Middle-Late Permian stratigraphic sequence from the sea to the continental facies, indicate that the Linxi formation is in the sedimentary environment of the Foreland basin. Marks the Jia-Meng block and the North China plate collision and assembly. The unconformity at the bottom of the early Triassic Lujiatun formation and the characteristics of the lower conglomerate of the Lujiatun formation in the southern margin of the Jia-Meng block indicate that the collision orogeny is still in progress and belongs to progressive orogeny. The unconformities at the bottom of the late Triassic Grand Sauce formation indicate that the orogeny has been completed and the process of independent development of the Jia-Meng landmass is over.
【作者单位】： 吉林大学地球科学学院;
【基金】：高等学校博士学科点专项科研基金项目(20110061110051) 国家自然科学基金项目(41372019)~~
【分类号】：P542
本文编号：2151213
[Abstract]:The contact relationship between the late Paleozoic and its related strata in Northeast China and its adjacent areas contains abundant tectonic information. This paper systematically combs these data to illustrate the formation and evolution of the Jia-Meng block. Xibeihe formation in the southern margin of Jia-Meng massif, The late Silurian and early Devonian strata in the northern margin of the Wuduhe formation and the eastern margin of the Heitai formation are unconformable (or unconformable) at the bottom of the strata, which reveals that the Northeast area has experienced a very important tectonic movement, indicating the formation of the Jia-Meng block. Most of the Devonian Carboniferous and Carboniferous Permian strata are integrated contacts, indicating that the Jia-Meng block is in stable subsidence and accepting sedimentary stage in this period. The parallel unconformities at the bottom of the late Permian Linxi formation in the southern margin of the Jia-Meng block and its upper Molarasite formation, as well as the transformation of the Middle-Late Permian stratigraphic sequence from the sea to the continental facies, indicate that the Linxi formation is in the sedimentary environment of the Foreland basin. Marks the Jia-Meng block and the North China plate collision and assembly. The unconformity at the bottom of the early Triassic Lujiatun formation and the characteristics of the lower conglomerate of the Lujiatun formation in the southern margin of the Jia-Meng block indicate that the collision orogeny is still in progress and belongs to progressive orogeny. The unconformities at the bottom of the late Triassic Grand Sauce formation indicate that the orogeny has been completed and the process of independent development of the Jia-Meng landmass is over.
【作者单位】： 吉林大学地球科学学院;
【基金】：高等学校博士学科点专项科研基金项目(20110061110051) 国家自然科学基金项目(41372019)~~
【分类号】：P542
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