Scholarlink

<p>The western flank of the Anambra Basin, Nigeria was analysed for its palynomorphs to decipher the palaeodepositional environment and the depositional age of the Basin. Traditional acid palynological method of sample administration was employed to extract the palynomorphs from the six shale samples recovered across two different locations of Obi and Oshodi camp, along Ifon-Uzzeba highway followed by the interpretation of palaeodepositional environments and possible age of lithological succession. The samples yielded 51 palynomorph species which occurred in varying degrees of abundance throughout the studied section. The palynomorphs identified were dominated by land derived species such as <i>Cingulatisporites ornatus, Constructipollenites ineffectus, Cyathidites minor, Echitriporites trianguliformis, Longapertites sp., Monocolpites marginatus, Proxapertites cursus Retidiporites magdalenensis and Tricolporopollenites sp</i>. Few fungal spores, diatom frustules and rare dinoflagellate cysts such as <i>Operculodinium centrocarpum and Spiniferites sp.</i> were also identified. Based on the palynoflora assemblage and marker species identified in the samples, a new assemblage affinity was identified as <i>Longapertites sp.-Monocolpites marginatus</i> palynological assemblage for the studied section. This correlates with the <i>Longapertites sp. 3 - Spinizonocolpites echinatus</i> palynozone of Lawal and Moullade (1986) classification. Therefore, Late Cretaceous (Campanian–Maastrichtian) age is interpreted for the studied interval in the western flank of Anambra Basin. Furthermore, presence of rare dinoflagellate including <i>Ceratiopsis sp., Operculodinium centrocarpum, Paleocystodinium sp</i>., and <i>Spiniferites sp.</i> together with land derived sporomorphs indicate a predominantly terrestrial palaeodepositional environment with intervals of near-shore environmental influence.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Palaeoenvironmental and depositional studies of the Late Cretaceous Ifon-Uzzeba Shale deposits of the western flank of the Anambra Basin, Nigeria

  • 期刊论文

  • 发表日期：

    2025年2月26日

查看全文
  • Johnson Ajidahun,
  • Michael Tomisin Asubiojo,
  • Temitayo Olamide Ale,
  • Temitayo Daniel Johnson,
  • Kazeem Oladimeji Olomo,
  • Oluyemi Emmanuel Faseki,
  • Mogbeyi Janeth Erorun

摘要

The western flank of the Anambra Basin, Nigeria was analysed for its palynomorphs to decipher the palaeodepositional environment and the depositional age of the Basin. Traditional acid palynological method of sample administration was employed to extract the palynomorphs from the six shale samples recovered across two different locations of Obi and Oshodi camp, along Ifon-Uzzeba highway followed by the interpretation of palaeodepositional environments and possible age of lithological succession. The samples yielded 51 palynomorph species which occurred in varying degrees of abundance throughout the studied section. The palynomorphs identified were dominated by land derived species such as Cingulatisporites ornatus, Constructipollenites ineffectus, Cyathidites minor, Echitriporites trianguliformis, Longapertites sp., Monocolpites marginatus, Proxapertites cursus Retidiporites magdalenensis and Tricolporopollenites sp. Few fungal spores, diatom frustules and rare dinoflagellate cysts such as Operculodinium centrocarpum and Spiniferites sp. were also identified. Based on the palynoflora assemblage and marker species identified in the samples, a new assemblage affinity was identified as Longapertites sp.-Monocolpites marginatus palynological assemblage for the studied section. This correlates with the Longapertites sp. 3 - Spinizonocolpites echinatus palynozone of Lawal and Moullade (1986) classification. Therefore, Late Cretaceous (Campanian–Maastrichtian) age is interpreted for the studied interval in the western flank of Anambra Basin. Furthermore, presence of rare dinoflagellate including Ceratiopsis sp., Operculodinium centrocarpum, Paleocystodinium sp., and Spiniferites sp. together with land derived sporomorphs indicate a predominantly terrestrial palaeodepositional environment with intervals of near-shore environmental influence.