干旱区生态环境知识资源中心(Arid): Paleoenvironmental significance and provenance of the Cretaceous calcareous deposits from the Djerem sub-basin (Adamawa, Cameroon) during the Gondwana evolution: sedimentary structures and geochemical constraints

Arid

DOI	10.5802/crgeos.67
	Paleoenvironmental significance and provenance of the Cretaceous calcareous deposits from the Djerem sub-basin (Adamawa, Cameroon) during the Gondwana evolution: sedimentary structures and geochemical constraints
	Tchouatcha, Milan Stafford; Kouske, Arnaud Patrice; Mioumnde, Arthur Paterne; Deaf, Amr Said; Ngnotue, Timoleon
通讯作者	Tchouatcha, MS (corresponding author)，Univ Dschang, Dept Earth Sci, POB 67, Dschang, Cameroon. ; Tchouatcha, MS (corresponding author)，Higher Inst Chem & Management, POB 4789, Yaounde, Cameroon.
来源期刊	COMPTES RENDUS GEOSCIENCE
ISSN	1631-0713
EISSN	1778-7025
出版年	2021
卷号	353 期号:1
英文摘要	The calcareous deposits were affected by syn-sedimentary (lamination, bedding, convolute, ripple marks, pseudo-nodule) and post-sedimentary structure (diaclase, fault, and desiccation crack). Lamination and bedding expressed by color variation and granulometry are linked to a calm period of sedimentation and seasonal fluctuations and are periodically affected by seismic shocks giving the convolute bedding and pseudo-nodules. The presence of symmetrical ripple marks and desiccation cracks indicate respectively back and forth water movements and periodic phases of emersion characteristics of lacustrine to swampy environments. According to geochemistry data, the major element composition classifies the studied samples as shales and wackes. High LREE/HREE ratios (9.07-13.08; average: 11.77); slight positive and negative Eu anomaly (0.98-1.11); Al2O3/TiO2 ratios (16.52-21.87; average: 19.73), Th/Co ratios (1.24-4.18; average: 2.26), La/Sc versus Th/Co and Zr versus TiO2 plots indicate sediments derived from felsic rocks. The K2O/Na2O ratios (0.24-1.90; average: 1.01); index of compositional variability (0.88-1.35); PIA (64.94-98.42) and the Zr/Sc versus Th/Sc diagram indicate that the source rocks have experienced globally a moderate recycling and sorting as well as moderate weathering. The chemical index of alteration values and the SiO2 versus Al2O3 + K2O + Na2O diagram could indicate relatively warm and arid to semi-arid climate during deposition of sediments. The Sr/Ba (0.22-2.01; average: 0.58) ratios indicate a variant salinity. The Y/Ho (<40) and U/Th (<0.75) suggest respectively nonmarine environment and oxic conditions. The Djerem continental sub-basin would not have undergone marine influences yet known in the Nigeria basins of Benue.
英文关键词	Calcareous deposits Sedimentary structures Geochemistry Paleoenvironment Provenance Djerem sub-basin Cameroon
类型	Article
语种	英语
开放获取类型	gold
收录类别	SCI-E
WOS记录号	WOS:000743579100008
WOS关键词	RARE-EARTH-ELEMENTS ; GULF-OF-MEXICO ; OIL-SHALE ; WEATHERING INTENSITY ; BEACH AREAS ; U-PB ; BASIN ; ROCKS ; SANDS ; TRACE
WOS类目	Geosciences, Multidisciplinary
WOS研究方向	Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/376007
作者单位	[Tchouatcha, Milan Stafford; Ngnotue, Timoleon] Univ Dschang, Dept Earth Sci, POB 67, Dschang, Cameroon; [Tchouatcha, Milan Stafford] Higher Inst Chem & Management, POB 4789, Yaounde, Cameroon; [Kouske, Arnaud Patrice] Univ Douala, Univ Inst Technol, POB 8698, Douala, Cameroon; [Mioumnde, Arthur Paterne] Inst Geol & Min Res, BP 4110, Yaounde, Cameroon; [Deaf, Amr Said] Assiut Univ, Fac Sci, Dept Geol, Assiut 71516, Egypt
推荐引用方式 GB/T 7714	Tchouatcha, Milan Stafford,Kouske, Arnaud Patrice,Mioumnde, Arthur Paterne,et al. Paleoenvironmental significance and provenance of the Cretaceous calcareous deposits from the Djerem sub-basin (Adamawa, Cameroon) during the Gondwana evolution: sedimentary structures and geochemical constraints[J],2021,353(1).
APA	Tchouatcha, Milan Stafford,Kouske, Arnaud Patrice,Mioumnde, Arthur Paterne,Deaf, Amr Said,&Ngnotue, Timoleon.(2021).Paleoenvironmental significance and provenance of the Cretaceous calcareous deposits from the Djerem sub-basin (Adamawa, Cameroon) during the Gondwana evolution: sedimentary structures and geochemical constraints.COMPTES RENDUS GEOSCIENCE,353(1).
MLA	Tchouatcha, Milan Stafford,et al."Paleoenvironmental significance and provenance of the Cretaceous calcareous deposits from the Djerem sub-basin (Adamawa, Cameroon) during the Gondwana evolution: sedimentary structures and geochemical constraints".COMPTES RENDUS GEOSCIENCE 353.1(2021).