中朝板块元古宙板内地震带与盆地格局
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摘要
地史中发生的强地震事件在地层中留下固定的记录 (图 1～ 3) ,这些记录在区域上呈带状分布 ,代表地史中的地震带。中朝板块元古宙目前可识别出两个板内地震带 (图 5 )。中元古代板内地震带 (170 0～ 12 0 0Ma)西起太行山北段 ,经燕山山脉、辽宁西部、穿越辽河平原至辽宁北部的泛河流域分布 ,即燕山—泛河地震带 ,现今呈NEE向延伸。新元古代震旦纪地震带沿吉林南部、辽东半岛、山东中部及苏皖北部现今呈NNE走向分布 ,即古郯庐地震带 (6 5 0～ 6 0 0Ma)。上述两个板内地震带是元古宙不同时期超大陆裂解的响应。中元古代与新元古代两个不同方向的地震断裂带分别控制着两个时期的盆地边界。燕山泛河地震断裂带构成中元古代海盆南界 (指现在的位置 ) ,形成向北开放的海域。古郯庐地震断裂带将中朝板块裂解为华北块体与胶辽朝块体。古郯庐地震断裂带构成震旦纪海域的边界 ,震旦纪海盆通过朝鲜半岛与当时的外海相连接 ,华北块体则为陆源剥蚀区。文内四幅古地理图 (图 6～ 9)是以地震灾变思想为指导 ,以新的地层研究、对比为基础编制的 ,侧重反映了盆地的格局及其变化。根据地震、同沉积断裂新的思路 ,可提供地质学家重新认识与解释某些沉积矿床的成因 ,它们的成矿元素均来自地球深部而非地表风化作用。文中编制
Strong earthquake happened in the earth history left fixed records in strata, and those seismic records show a belt type distribution in zones, which stand for the seismic belts in the earth history. Presently, two intraplate seismic belts of Proterozoic can be identified in Sino Korean Plate (Fig.5). Intraplate seismic belt of Mesoproterozoic is distributed along the Yanshan Mountains, the west of Liaoning, passing through the plain of Liaohe River and the Fanhe River areas; it is called the Yanshan Fanhe Seismic Belt (1 700～1 200 Ma) which extends along NEE direction presently. The Sinian seismic belt of Neoproterozoic is distributed along the south of Jilin, the Liaodong Peninsula, the middle of Shandong and the north of Jiangsu Anhui, and now is distributed in NEE trend; it is called the Paleo Tanlu Seismic Belt (650～600 Ma). The two intraplate seismic belts mentioned above are the responses to the supercontinental breaking up in various stage of Proterozoic (Fig.4). Two seismic fault belts with different directions in Mesoproterozoic and Neoprotertozoic control the basin boundaries of the two stages respectively. The Yanshan Fanhe Seismic Fault Belt constitutes the south boundary (present position) of the Mesoproterozoic basin, and forms the sea area opening toward the north. The Paleo Tanlu Seismic Fault broke up the Sino Korean Plate into the North China Block (NCB) and the Jiao Liao Korea Block (JLKB) (Fig.9). The boundary of the Sinian sea area is constituted by the Paleo Tanlu Seismic Belt, and the Sinian sea basin connected with the open sea of that time through the Korea Peninsula; whereas the North China Block is a land source area. Four brief paleogeographic maps of Sino Korean Plate in Proterozoic (Fig.6～9) emphasize on reflecting the basin framework and its changes; and they were compiled on the foundation of the new study and comparison of the strata and with the instructions from the thought of the seismic catastrophe. The thoughts from the seism and syndepositional faults could provide some new ideas for geologists to distinguish and to explain some origins of sedimentary mineral deposit, in which all the elements came from the interior of the earth, not from the surface weathering. According to the above explanation, the paleogeographic maps in this paper will show the background of the relationship between the depositional basin and the stratigraphic events.
Strong earthquake happened in the earth history left fixed records in strata, and those seismic records show a belt type distribution in zones, which stand for the seismic belts in the earth history. Presently, two intraplate seismic belts of Proterozoic can be identified in Sino Korean Plate (Fig.5). Intraplate seismic belt of Mesoproterozoic is distributed along the Yanshan Mountains, the west of Liaoning, passing through the plain of Liaohe River and the Fanhe River areas; it is called the Yanshan Fanhe Seismic Belt (1 700～1 200 Ma) which extends along NEE direction presently. The Sinian seismic belt of Neoproterozoic is distributed along the south of Jilin, the Liaodong Peninsula, the middle of Shandong and the north of Jiangsu Anhui, and now is distributed in NEE trend; it is called the Paleo Tanlu Seismic Belt (650～600 Ma). The two intraplate seismic belts mentioned above are the responses to the supercontinental breaking up in various stage of Proterozoic (Fig.4). Two seismic fault belts with different directions in Mesoproterozoic and Neoprotertozoic control the basin boundaries of the two stages respectively. The Yanshan Fanhe Seismic Fault Belt constitutes the south boundary (present position) of the Mesoproterozoic basin, and forms the sea area opening toward the north. The Paleo Tanlu Seismic Fault broke up the Sino Korean Plate into the North China Block (NCB) and the Jiao Liao Korea Block (JLKB) (Fig.9). The boundary of the Sinian sea area is constituted by the Paleo Tanlu Seismic Belt, and the Sinian sea basin connected with the open sea of that time through the Korea Peninsula; whereas the North China Block is a land source area. Four brief paleogeographic maps of Sino Korean Plate in Proterozoic (Fig.6～9) emphasize on reflecting the basin framework and its changes; and they were compiled on the foundation of the new study and comparison of the strata and with the instructions from the thought of the seismic catastrophe. The thoughts from the seism and syndepositional faults could provide some new ideas for geologists to distinguish and to explain some origins of sedimentary mineral deposit, in which all the elements came from the interior of the earth, not from the surface weathering. According to the above explanation, the paleogeographic maps in this paper will show the background of the relationship between the depositional basin and the stratigraphic events.
引文
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[4] PLAZIATJC ,PURSERBH ,PHILOBBOSE .SeismicdeformationstructureoftheNWRedSea(Egypt)[J].BullSocGeolFrance,1990,8(3):419434.
[5] QIAOXiufu,SONGTianrui,GAOLinzhi,etal.Seismicsequenceincarbonaterocksbyvibrationalliquefaction[J].ActaGeologicaSinica,1994,7(3):243265(Englishedition).[乔秀夫,宋天锐,高林志,等.碳酸盐岩地震液化序列[J].地质学报,1994,68(1):1634.]
[6] QIAOXiufu,SONGTianrui,LIHaibing,etal.GeneticStratigraphyoftheSinianandLowerCambrianStratainSouthLiaoningProv ince—GuidebookoftheNationalScenicAreaofJinshitanBeach[M].Beijing:SciencePress,1996.1174(inChinese). [乔秀夫,宋天锐,李海兵,等.辽东半岛南部震旦系—下寒武统成因地层(附大连市金石滩海岸国家级风景区旅游导游[M].北京:科学出版社,1996.1174.]
[7] FAIRCHILDIJ ,EINSELEG ,SONGTianrui.Possibleseismicori ginofmolartoothstructuresinNeoproterozoiccarbonaterampdepos it,northChina[J ].Sedimentology,1997,44:611636.
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