...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of African earth sciences >Palynology and palynofacies analyses in the Douala sub-basin: Implications on palaeoenvironment evolution of the Souellaba Formation/west Cameroon
【24h】

Palynology and palynofacies analyses in the Douala sub-basin: Implications on palaeoenvironment evolution of the Souellaba Formation/west Cameroon

机译：杜阿拉分盆地的腭学和野生植物分析：对萨福拉群地区/西喀麦隆古环境演变的影响

获取原文
获取原文并翻译 | 示例
   

获取外文期刊封面封底 >>

       
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Investigations were carried out on the Tertiary sedimentary sequences from west Cameroon, namely the Mamiwater well (from 268 to 828 m), the Pungo well (from 731 to 1338 m) and the Yatou well (from 700 to 1402 m). These intervals correspond to the Souellaba Formation (SFm) of the Douala sub-basin according to the well final report produced by the National Hydrocarbons Corporation of Cameroon (NHC). The aim of this study was to characterize the lithofacies, the palynological zones, and characterize the depositional environments based on palynomorphs and palynofacies. The studied intervals are dominated by shale interbedded with limestone and siltstone; a few beds of claystone, fine to medium and coarse-grained sandstone (limited to the Pungo well) and rare marl layers are also observed. Three main palynozones were identified in each well and each zone is named. The palynological composition of the assemblages is marked by the abundance of spores and pollen grains and several stratigraphic markers in the three wells such as Cicatricosisporites dorogensis, Perigrinipollis nigericus, Proteacidites cooksonii, Zonocostites ramonae, Magnastriatites howardi, Loranthacidites nataliae, Brevicolporites molinae, Triporotetradites hookenii, Marginipollis concinnus and Adhenantheridites simplex. The dominance of the latter over dinoflagellate cysts in the Souellaba Fm indicates a high continental influence. The high percentage of angiosperms pollens grains, which are dominant in the assemblages, indicates the proximity of terrestrial sources associated with oxygenated environments. Moreover, the dominance of terrestrial palynomorphs and the relative abundance of marine palynomorphs are interpreted as indicating shallow marine environments of deposition close to terrestrial source. This marine condition is confirmed by the presence of foraminiferal test linings. The abundance of plant debris within the palynofacies indicates a climatic control on the parent vegetation and suggests the proximity to fluvial inputs. The organic matter analysis reveals type III kerogen. The relatively high number of opaque phytoclasts suggests combustion events.
机译：对西喀麦隆的第三次沉积序列进行调查，即妈咪水井（从268至828米），普尔戈井（从731至1338米）和Yatou井（从700-1402米到）。这些间隔对应于DouaLa子盆地的Souellaba形成（SUELLABA形成（SUELLABA形成（SUELLABA形成（SUELLABA）根据喀麦隆国家碳氢化合物公司（NHC）生产的最终报告。本研究的目的是表征锂外，术语区，并基于Palynomorphs和Palynofacies表征沉积环境。学习的间隔由互粘附的石灰石和粉砂岩占主导地位;还观察到几张粘土砂岩，精致的中等和粗粒砂岩（限于挥霍井）和罕见的Marl层。在每个孔中识别出三个主要的野生唑酮，每个区域都被命名。组装的宫腔学组成是由三个孔中的孢子和花粉颗粒的丰度和几种分层标记，如卡托里氏菌素，Perigrinipollis nigericus，ProTeacidites Cooksonii，Zonocostites ramonae，Magnastraties Howari，Loranthacidites Natalia，Brevicolporites Molinae，Triporottradites Hookenii， Marginipollis Concinnus和Adhenantheridites Simplex。后者在Souellaba FM中对Dinoflagellate囊肿的优势表明了高欧洲影响力。在组合中占主导地位的高百分比高百分比，其占主导地位，表明与含氧环境相关的地面源。此外，陆生盲族植物的优势和海洋野生植物的相对丰度被解释为表明近围绕地面源的沉积浅海环境。这种海洋状况通过面向氨酰胺试验衬里确认。野生植物内的植物碎片丰富表明母体植被上的气候控制，并提出了对河流投入的邻近。有机物分析显示III型Kerogen。相对较多的不透明植物植物表达燃烧事件。

著录项

相似文献

  • 外文文献
  • 中文文献
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号