Geochemical maturity, litho-tectonic settings and source area paleoweathering characterization of the Cretaceous Mundeck and Mungo River Formation sandstones, North Western, Douala sub basin, West Africa: A petrographic and geochemical approach

IF 2 4区 地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY Solid Earth Sciences Pub Date : 2024-02-02 DOI:10.1016/j.sesci.2024.01.002
Mokake Esue Fidelis , Mary Ewokolo Moloua Etutu , Bisse Salomon Betrant , Bokanda Ekoko Eric , Florence Njinto Kwankam , Victor L. Wotany , Lemnyuy Prosper Yiika , E. Mengu Emmanuel , Njoh, N. Clevis , N. Nfor Shannon , Patrick Mendi Wajiba , Chin Thiery Berinyuy , Kah Odilia Sih , Christorpher M. Agyingi
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Abstract

The Mundeck and Mungo River Formation sandstones located within the Douala sub basin in Cameroon were subjected to both petrographic and geochemical analyses to unveil their geological characterization such as chemical and mineralogical maturity, litho-tectonic setting, climate and weathering intensity of the source area at the time of their formation. Petrographic studies reveals that the sandstones show variable colours ranging from reddish to brownish, pinkish, grey and white with textures ranging from medium to coarse grained. The studied sandstones consist of various types of angular to sub angular, quartz, rock fragments, mica, feldspar. Modal analysis data and plots of detrital modes of the studied sandstones on Qt–F–RF diagrams suggest that they were derived from a plutonic source rock (igneous origin) with little or no contribution from metamorphic sources. Plot of the Qm–F–L diagram of the studied sandstones reveal a quartzose recycled and transitional continental provenance fields. Mineralogical classification of these sandstones from Qt–F–RF triangular diagram classifies them as arkose, lithic arkose and sub-litherarenite. Bivariate plot of Qp/(F + R) vs (Qm + Qp)/(F + R), SiO2 Vs Al2O3 +K2O + Na2O coupled with values of Chemical index Alteration (CIA = 70–99) and plagioclase index Alteration (PIA>80) reveal a moderate to high intensity of weathering in the source area under a semi-humid to humid paleoclimatic conditions with high lixiviation of feldspars (PIA>80 %) for the studied sandstones. The mineralogical maturity index (MMI = 3–9) coupled with the new index of compositional variation (ICVnew <1) reveal that the sandstones are sub mature to mature. Geochemical binary plots of La/Sc, Th/Co, Th/Sc couple with plots of DF1vs DF2 and K2O/Na2O vs SiO2 points to an igneous felsic source rock formed in a passive margin for the studied sandstones.

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西非杜阿拉次盆地西北部白垩纪蒙代克和蒙戈河地层砂岩的地球化学成熟度、岩石构造背景和源区古风化特征:岩石学和地球化学方法
对位于喀麦隆杜阿拉次盆地的蒙代克和蒙戈河地层砂岩进行了岩石学和地球化学分析,以揭示其地质特征,如化学和矿物学成熟度、岩石构造环境、气候以及形成时源地的风化强度。岩石学研究显示,这些砂岩呈现出不同的颜色,从淡红色到褐色、粉红色、灰色和白色,纹理从中等到粗粒不等。所研究的砂岩由各种类型的角状至亚角状石英、岩石碎片、云母和长石组成。所研究砂岩的模态分析数据和 Qt-F-RF 图上的碎屑模态图表明,这些砂岩来自柱状源岩(火成岩源),变质源很少或没有。所研究砂岩的 Qm-F-L 图显示了石英质再循环和过渡大陆来源领域。根据 Qt-F-RF 三角图对这些砂岩进行的矿物学分类将其划分为石英质砂岩、石英质砂岩和亚锂辉石岩。Qp/(F + R) vs (Qm + Qp)/(F + R)、SiO2 Vs Al2O3 +K2O + Na2O 的双变量图以及化学蚀变指数(CIA = 70-99)和斜长石蚀变指数(PIA>;80)显示,在半湿润至潮湿的古气候条件下,所研究砂岩的源区风化强度为中度至高度,长石的活化程度较高(PIA>80 %)。矿物学成熟度指数(MMI = 3-9)和新的成分变异指数(ICVnew <1)显示,这些砂岩从亚成熟到成熟。La/Sc、Th/Co、Th/Sc 的地球化学二元图以及 DF1 vs DF2 和 K2O/Na2O vs SiO2 的图表明,所研究的砂岩是在被动边缘形成的火成长岩。
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来源期刊
Solid Earth Sciences
Solid Earth Sciences GEOSCIENCES, MULTIDISCIPLINARY-
CiteScore
3.60
自引率
5.00%
发文量
20
审稿时长
103 days
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