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华北北部边缘区的二叠纪地层过去多认为是海相浅水沉积. 从内蒙古中部哲斯地区和东部锡林浩特地区二叠纪哲斯组泥岩中发现的放射虫化石等证据表明, 该区中二叠统主体应为深水海相沉积.北方造山带内蒙古中、东部地区中二叠世深水海相地层的确定, 进一步证实华北板块与西伯利亚板块的最终拼合至少发生在瓜德鲁普世末之后, 同时根据含放射虫地层的分布和相关生物群的古地理分区推断拼合的位置应位于贺根山蛇绿岩带以南的林西地区.
The Permian strata in the northern margin of northern North China were mostly considered as marine shallow sediments in the past. Evidence from radioactive fossils found in the mudstone of the Permian Cecilian Formation in the Xhhot area in the central Jesu region of eastern Inner Mongolia shows that the Middle Permian The main body should be the deep-sea marine sediments.The determination of the Middle-Permian deep-water marine strata in the central and eastern Inner Mongolia of the Northern Orogenic Belt further confirmed that the final assemblage of the North China Plate and the Siberian Plate occurred at least after the Guadalupe world, Based on the distribution of the radiolarian stratigraphy and the paleogeographical zonation of the associated biota, the location of the assemblage should be located in the western Linhe area south of the Hengenshan ophiolite zone.