globalchange  > 过去全球变化的重建
DOI: 10.1016/j.palaeo.2017.07.009
论文题名:
First palynostratigraphical evidence for a Late Eocene to Early Miocene age of the volcano-sedimentary series of Dschang, western part of Cameroon and its implications for the interpretation of palaeoenvironment
作者: Moise B.; Victor H.J.; Burkhardt S.F.; Samankassou E.; Bennami M.; Désiré N.J.; Olive M.C.; Adatte T.; Martini R.; Brunet M.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2017
语种: 英语
英文关键词: Cameroon ; Eocene ; Miocene ; Ngoua sedimentary sequence ; Palaeoenvironment ; Palynology
英文摘要: The volcano-sedimentary infill of the Dschang basin in the Western part of Cameroon is poorly known. The present study provides the first biostratigraphical data of the volcano-sedimentary sequence and allows constraining the age and the position of this basin within the regional context of Central Africa. The studied sequence is composed of three depositional units. The first unit is a fining-upwards sequence of coarse-grained sandstone that gets finer towards the top, passing to thick layers of fossiliferous claystone. The second unit is strongly affected by volcanic activity and consists of a volcano-sedimentary sequence. The third unit is marked by basaltic volcanism and covers the series. Diverse and well-preserved palynomorphs were recovered and are used to provide valuable information for age determination of the Dschang volcano-sedimentary sequence, namely to be of late Eocene- Early Miocene age. The recovered spores, pollen, green algae and fungal remains from the bottom of the sequence include Bombacidites spp., Clavainaperturites cf. clavatus, Crototricolpites sp., Perfotricolpites digitatus, Proteacidites spp., Psilastephanocolporites minor, Psilastephanocolporites spp., Retitrescolpites spp., Retitricolporites irregularis, Retitricolporites spp., Retitriporites sp., Spirosyncolpites bruni (probably synonymous to Spirosyncolpites spiralis), Striatopollis bellus, (considered synonymous to Striatopollis catatumbus), Striatopollis sp., Tetracolporites quadratus, Tetratricolporites sp., ?Verrutricolporites rotundiporis, Cyathidites sp., Laevigatosporites spp., Polypodiaceoisporites spp., Verrucatosporites usmensis, Verrucatosporites spp., Botryococcus sp., Tasmanites sp., and fungal remains.The samples are assigned to the Verrucatosporites usmensis Zone of Salard-Cheboldaeff (1979). The palynological assemblages are similar to those of other Late Eocene to Early Miocene palynological records from the West, Central and Northern African basins. Study of the organic matter by pyrolysis Rock-Eval 6 (Types I, II and III), the sedimentological setting, the palynofacies and the palynomorph assemblages show evidences of tidal influence (presence of the prasinophyte Tasmanites) in an active continental margin (semi-arid to humid lacustrine depositional environment). The Ngoua sedimentary sequence is fluvio-lacustrine, and believed to have witnessed some occasional marine incursions possibly during the opening of the Central Atlantic Ocean (CAO) and strongly disturbed later by intense volcanic activity. © 2017 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/68156
Appears in Collections:过去全球变化的重建

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作者单位: Institute for Geological and Mining Research (IRGM), B.P. 4110 Yaoundé, Cameroon; Section of Earth and Environmental Sciences, Department of Earth Sciences, University of Geneva, 13, Rue des Maraichers, 1205 Geneva, Switzerland; SBF Geological and Consulting Services, Odenwaldstrasse 18, D-64372 Ober-Ramstadt, Germany; Institute of Palaeoprimatology, Human Palaeontology: Evolution and Palaeoenvironments, UMR CNRS 7262 INEE, UFR SFA, University of Poitiers, France; Department of Geosciences, University of Douala, B.P. 2701 Douala, Cameroon; Institute of Earth Sciences (ISTE), University of Lausanne, Building Géopolis, 1015 Lausanne, Switzerland; Collège de France, Paris, France

Recommended Citation:
Moise B.,Victor H.J.,Burkhardt S.F.,et al. First palynostratigraphical evidence for a Late Eocene to Early Miocene age of the volcano-sedimentary series of Dschang, western part of Cameroon and its implications for the interpretation of palaeoenvironment[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2017-01-01
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