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首页> 外文期刊>Scientia Africana: An International Journal of Pure & Applied Sciences >LATE MAASTRICHTIAN- EARLY EOCENE DINOFLAGELLATE CYST BIOSTRATIGRAPHY AND PALEOENVIRONMENTAL STUDY OF SEDIMENTS IN AKUKWA-1 WELL IN THE ANAMBRA BASIN
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LATE MAASTRICHTIAN- EARLY EOCENE DINOFLAGELLATE CYST BIOSTRATIGRAPHY AND PALEOENVIRONMENTAL STUDY OF SEDIMENTS IN AKUKWA-1 WELL IN THE ANAMBRA BASIN

机译：阿斯特里赫特晚期-始新世早期甲藻囊肿生物地层学和阿南布拉盆地AKUKWA-1井沉积物的古环境研究

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摘要

Dinoflagellate cyst biostratigraphy and palaeoenvironment of deposition of sediments penetrated by Akukwa-1 Well was carried out with a total of 253ditch cuttings using the conventional maceration technique for recovering of acid insoluble organic-walled microfossils from sediments. Sedimentological description delineated five (5) lithological units within the well, which included those of Nkporo Shale, Mamu Formation, Ajali Sandstone, Nsukka Formation and Imo Shale. A total of 14 genera and 35 species of dinoflagellate cyst were identified. The recovered dinocysts were used to establish palaeoenvironment which ranged from marginal to shallow marine, the forms were also used to propose four (4) informal dinoflagellate cyst zonations labelled (A-D) based on the first and last occurrences of two or more species. They included Zone A (Apectodinium paniculatum zone), occurring at 7990ft(Maastrichtian), zone B(Paleocystodinium australinium zone) occurring between 7990ft -4000ft (Upper Maastrichtian), zone C(Apectodinium homomorphum zone) occurring between 4000ft -2550ft (Upper Maastrichtian), and zone D{Homotryblum palladium zone) occurring between 5550ft-1520ft(Paleocene- Early Eocene). The erected dinocyst zones were correlated with the existing biozones in tropical areas of Africa and northern South America.
机译：腰鞭毛虫囊肿生物地层学和古环境沉积物的沉积渗透通过Akukwa-1进行共有253个沟岩屑使用传统的浸渍技术恢复酸不溶性organic-walled化石从沉积物。划定五(5)岩性单元内嗯,其中包括Nkporo页岩,Mamu形成,Ajali砂岩、善解形成和国际海事组织页岩。腰鞭毛虫囊肿被确定。恢复dinocysts被用来建立古环境的范围从边际浅海洋,形式也被进行了提出四(4)非正式的腰鞭毛虫囊肿分带标签根据第一和(模拟)去年出现的两个或两个以上的物种。包括区域(Apectodinium paniculatum区),发生在7990英尺(马斯特里赫特统),区B (Paleocystodinium australinium区)发生-4000到7990英尺英尺(马斯特里赫特统上部),区C (Apectodinium homomorphum区)发生-2550到4000英尺英尺(马斯特里赫特统上部),和区D {Homotryblum钯区)发生在5550英尺- 1520英尺(古新世-始新世早期)。竖立dinocyst区域相关现有的生物带在非洲的热带地区和南美洲北部。

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