刚果大西洋盆地北部深海地块中新世有孔虫生物地层学及其解释

Nehl Dorland Kobawila, H. Elenga, Louis Richard Ngatse
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摘要

这项工作是刚果中新世大西洋盆地北深海地区的生物地层学和古环境研究的主题。这项研究是从侧向岩心、钻屑和电测井的样本中进行的。岩性通常表现为弱硬结灰色粘土、浅灰色粉砂岩和白色石英砂的不规则交替,从中粒到粗粒,从次棱角到圆形。海绿石的存在表明沉积物是在平静和还原的环境中沉积的。整个地层都有化石。微体层分析揭示了120种有孔虫,包括98种浮游生物(81.67%)和22种底栖生物(18.33%),用于生物区划、年代测定和古环境解释。同样,浮游生物有孔虫的生物事件,以某些物种首次出现的水平为特征,已经可以识别出15个生物区与年龄相对应的(蛇尾圆辐口虫、梅罗图圆辐口螺、阿氏圆辐口菌、梅纳尔迪圆辐口鱼、猪笼草圆辐口动物、西氏圆辐面动物、普氏圆辐头动物、外圆辐口生物、外圆旋口动物、西卡氏普氏普氏虫、异化Catapsydrax disimilis、insueta圆辐口兽、库氏副角辐口动物和库氏圆辐口动物)介于阿基坦阶和上新世下统之间。有孔虫的生物相分析已经确定了从开阔海洋环境到深海环境的古环境。
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Miocene Foraminifera Biostratigraphy and Interpretation North Deep Sea Block of the Congolese Atlantic Basin
This work is the subject of the biostratigraphic and palaeoenvironmental study of the North Deep Sea area of the Congolese Miocene Atlantic Basin. This study is made from samples of lateral cores, drill cuttings and electrical logs. Lithology generally exhibits an irregular alternation of weakly indurated grey clay, light grey siltstones, and whitish, quartzitic sand, medium to coarse-grained, sub-angular to rounded. The presence of glaucony indicates that sediments have been deposited in a calm and reducing environment. The entire formation is fossiliferous. Micropaleontological analysis revealed 120 species of foraminifera including 98 planktonic (81.67%) and 22 benthic (18.33%) species used for biozonation, dating and interpretation of palaeoenvironments. Similarly, the bio-events of plankton foraminiferal, characterized by the level of the first appearance of certain species, have made it possible to identify fifteen biozones (Globorotalia plesiotumida, Globorotalia merotumida, Globorotalia acostaensis, Globorotalia menardii, Globigerina nepenthes, Globorotalia siakensis, Globorotalia fohsi, Globorotalia praefohsi, Globorotalia peripheroacuta, Globorotalia peripheroronda, Praeorbulina sicana, Catapsydrax dissimilis, Globigerinatella insueta, Paragloborotalia kugleri and Globorotalia kugleri) corresponding to age between Aquitanian and Lower Pliocene. Biofacies analysis of foraminifera has identified palaeoenvironments that vary from open marine environments, bathyal to abyssal.
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