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通过对研究区地层剖面、接触关系、区域地层对比及同位素测年等资料的研究,将发育于大兴安岭地区原满克头鄂博组下部的一套杂色复成分砾岩、含砾粗砂岩夹火山岩组合的地层厘定为上侏罗统土城子组,与燕辽地区之土城子组有较好的可比性.研究区土城子组的发现,一是填补了研究区土城子组的空白;二是通过对该组形成时代的讨论以及与上覆地层的接触关系研究,为该区与燕辽地区中生代地层划分与对比研究提供了依据,同时为兴安岭地区中生代地质演化研究提供参考.
Through the study of the stratigraphic profiles, contact relationships, regional stratigraphic correlation and isotopic dating data in the study area, a set of variegated complex conglomerate and pebbly coarse sandstone volcanic rocks developed in the lower part of the former Manchu Ebo Group in the Greater Hinggan Mountains, The combination of strata is determined as the Upper Jurassic Tuchengzi Formation which has a good comparability with Tuchengzi Formation in Yanliao area.The discoveries of Tuchengzi Formation in the study area fill the gap of Tuchengzi Formation in the study area Through the discussion of the formation age and the relationship with the overlying strata, this study provides a basis for the study of the Mesozoic stratigraphic division and contrast in this area and the Yanliao area, and provides a reference for the study of the Mesozoic geological evolution in the Xing’an Mountains.