The attributes of the Mesoproterozoic unconformities in the Yanliao rift trough
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摘要: 燕辽裂陷槽中元古代沉积层序中出现多个沉积间断和不整合面。本次研究对其中的5个不整合面进行野外考察,分析其地质特征并进行地层对比,最后判断其性质。大红峪组底部、高于庄组底部和杨庄组底部的不整合面是沉积属性,其中大红峪组底部不整合面是海侵超覆沉积的结果,高于庄组底部和杨庄组底部的不整合面由海平面升降变化所引起;铁岭组顶部和下马岭组顶部不整合面是构造属性,系大规模的抬升运动所造成。Abstract: There exist several depositional breaks and unconformities in the Mesoproterozoic successions in the Yanliao rift trough. The examination of the attributes of the unconformities in this study is based on the field investigation, geological characteristics and stratigraphic correlation. The unconformities at the bottom of the Dahongyu, Gaoyuzhuang and Yangzhuang Formations are interpreted to be of sedimentary origin. On the whole, the unconformities at the bottom of the Dahongyu Formation resulted from the transgressive onlap; those at the bottom of the Gaoyuzhuang and Yangzhuang Formations are attributed to the eustatic fluctuations, and those at the top of the Tieling and Xiamaling Formations are caused by the large-scale tectonic uplift and thus have a tectonic origin.
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Keywords:
- Yanliao rift trough /
- Mesoproterozoic /
- unconformity /
- transgressive onlap /
- tectonic uplift
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