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首页> 外文期刊>International Journal of Innovative Research in Science, Engineering and Technology >PALYNOLOGICAL STUDIES OF UPPER CRETACEOUS SUCCESSION OF HERWA-1 WELL, CENTRAL CHAD BASIN, NIGERIA
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PALYNOLOGICAL STUDIES OF UPPER CRETACEOUS SUCCESSION OF HERWA-1 WELL, CENTRAL CHAD BASIN, NIGERIA

机译：尼日利亚乍得中部盆地HERWA-1井上部白垩纪演替的岩石学研究

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The Late Cretaceous succession penetrated by Herwa-1well in the Central Chad Basin, North East Nigeria was investigated for its palynological content. This investigation produced biostratigraphically significant Pollen, Spore and dinoflagellate cyst. The studied interval penetrated a sequence of clay, sandstone, shale, shally sandstone, sandy shale and sandstone, occuriing at different intervals in all the wells. Based on the stratigraphic distribution of the palynomorphs from the Herwa-1 –well. Twelve informal assemblage palynozones and six dinoflagellate assemblage biozones spanning the Upper Cretaceous were identified in the Chad Basin, Nigeria. The zones are: Assemblage Zones I-IV (Cenomanian); Assemblage Zone V (Turonian); Assemblage Zone VI,VII,VIII, and IX (Coniacian-Santonian); and Assemblage Zones X,XI, XII, and XIII (Campanian-Maastrichtian) for the Pollen/Spore biozones.. The age determinations are based on the known stratigraphic ranges of pollen, spores and dinoflagellate and their relative stratigraphic positions. Data from the studied well revealed that generally in the basin, there is relatively higher frequency of the land derived pollen and spores compared to marine palynomorph abundance, which suggests a paralic condition of continental to shallow marine environment. The shallow marginal marine environment is further supported by the presence high diversity of dinoflagellate species and foram test linings at some depths which are indicative of marine paleoenvironment i.e. neritic environment.
机译：研究了尼日利亚东北部乍得盆地中部赫瓦一井穿透的晚白垩世演替的孢粉含量。该调查产生了具有生物地层学意义的花粉，孢子和鞭毛藻囊肿。所研究的层段渗透了一系列的粘土，砂岩，页岩，泥质砂岩，砂质页岩和砂岩，并以不同的间隔出现在所有井中。基于Herwa-1井古貌的地层分布。在尼日利亚的乍得盆地中，发现了十二个非正式组合的ly带和六个跨鞭毛的生物鞭毛体生物带。这些区域是：I-IV组合区（Cenomanian）;集合区V（土耳其语）;集合区VI，VII，VIII和IX（Coniacian-Santonian）;花粉/孢子生物区的集合区X，XI，XII和XIII（Campanian-Maastrichtian）。年龄的确定是基于已知的花粉，孢子和甲鞭毛的地层范围及其相对地层位置。来自研究井的数据显示，与海洋石ly虫的丰度相比，盆地中的陆地花粉和孢子的发生频率相对较高，这表明大陆环境是浅海环境的平行条件。浅鞭毛海洋环境进一步得到了鞭毛藻物种和甲孔试验衬层的高度多样性的支持，这些物种在某些深度表明了海洋古环境，即弱环境。

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