【摘要】：東北及鄰區(qū)晚古生界及其相關(guān)地層間的接觸關(guān)系含有豐富的大地構(gòu)造信息,本文系統(tǒng)梳理了這些資料,用以闡述佳-蒙地塊的形成與演化。佳-蒙地塊南緣的西別河組、北緣的臥都河組及東緣的黑臺組等晚志留世—早泥盆世地層底部均發(fā)育不整合(或非整合),揭示了東北地區(qū)曾經(jīng)歷了一次十分重要的大地構(gòu)造運動,標志著佳-蒙地塊的形成。區(qū)內(nèi)泥盆紀—石炭紀和石炭紀—二疊紀地層之間多為整合接觸,說明這一時期佳-蒙地塊處于穩(wěn)定沉降接受沉積階段。佳-蒙地塊南緣晚二疊世林西組底部的平行不整合界面及其上部的磨拉石建造,以及中—晚二疊世地層序列由海相向陸相的轉(zhuǎn)化,表明林西組處于前陸盆地的沉積環(huán)境,標志著佳-蒙地塊與華北板塊發(fā)生碰撞拼合。佳-蒙地塊南緣早三疊世盧家屯組底部的不整合及盧家屯組下部礫巖所具有的磨拉石建造特征,說明碰撞造山作用仍在持續(xù)進行,屬于遞進造山作用。晚三疊世大醬缸組底部的不整合,說明造山作用已經(jīng)完成,佳-蒙地塊獨立發(fā)展的歷程結(jié)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.
【作者單位】： 吉林大學(xué)地球科學(xué)學(xué)院;
【基金】：高等學(xué)校博士學(xué)科點專項科研基金項目(20110061110051) 國家自然科學(xué)基金項目(41372019)~~
【分類號】：P542

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本文編號：2151213