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首页> 外文期刊>International Journal of Geosciences >Depositional Facies and Sequence Stratigraphic Study in Parts of Benin (Dahomey) Basin SW Nigeria: Implications on the Re-Interpretation of Tertiary Sedimentary Successions
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Depositional Facies and Sequence Stratigraphic Study in Parts of Benin (Dahomey) Basin SW Nigeria: Implications on the Re-Interpretation of Tertiary Sedimentary Successions

机译：尼日利亚西南贝宁（达荷美）盆地部分地区的沉积相和层序地层研究：对第三纪沉积演替的重新解释的意义

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Detailed fieldwork in parts of the Benin (Dahomey) Basin SW, Nigeria has allowed the recognition of sedimentary successions deposited in different continental depositional environments interpreted as fluvial sedimentation characterised by abandoned channels and subaerial exposure features. The lithofacies recognised?are:?conglomerates, debris flow deposits, very coarse grained sandstone, ferruginous cross bedded sandstone, siltstone, shale/clay and massive sand. The lithofacies were?interpreted in terms of sequence stratigraphic elements with the recognition of sequence boundaries characterised by distinct facies dislocations and subaerial exposures. Four depositional sequences (DS I to DS IV) were identified. Depositional sequences (DS I) exhibited a complete regressive–transgressive cycle comprising LST, TST and HST, while DS II to DS IV?were?incomplete comprising of sediments interpreted as LST deposits. On the basis of the depositional facies and?sequence stratigraphic elements, the sediments in the area of study are interpreted as predominantly of?Ilaro Formation while fewer exposures are sediments of the Coastal Plain Sands/?Benin Formation. This observation suggests a re-interpretation of the Tertiary sedimentary successions, which hitherto recognised all the sediments in the area of study as Coastal Plain Sands.
机译：尼日利亚西南部贝宁（达荷美）盆地部分地区的详细野外工作已使人们认识到沉积在不同大陆沉积环境中的沉积演替过程，这些沉积演替被解释为以废弃河道和地下暴露特征为特征的河流沉积。公认的岩相为：砾岩，泥石流沉积物，非常粗粒的砂岩，含铁的交叉层状砂岩，粉砂岩，页岩/粘土和块状砂岩。岩相根据层序地层要素解释，并识别出具有明显相错位和高空暴露特征的层序边界。确定了四个沉积序列（DS I至DS IV）。沉积层序（DS I）表现出包括LST，TST和HST的完整的回归-海进循环，而DS II到DS IV则不完整，包括被解释为LST沉积的沉积物。根据沉积相和层序地层要素，研究区域的沉积物主要解释为“ Ilaro”地层，而沿海平原砂/贝宁地层的沉积物则较少。这一发现提示对第三纪沉积演替的重新诠释，迄今已将研究区域内的所有沉积物识别为沿海平原砂岩。

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