西非Mamfe盆地白垩系黑色页岩微量元素地球化学、总有机碳、古盐度及热液特征

IF 2 4区 地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY
Bokanda Ekoko Eric , Philip Fralick , Bisse Salomon Betrant , Ashukem Ethel Nkongho , Belinga Belinga Cedric , Bokanda Frankline Besonge , Ligbwah Victor Wotanie , Chin Thiery Berinyuy , Ekomane Emile
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引用次数: 4

摘要

对马铁盆地页岩进行了地球化学分析,确定了其沉积时的古盐度和热液特征。采用硼/镓(B/Ga)、锶/钡(Sr/Ba)、总硫/总有机碳(S/TOC)和TOC/S等元素比值进行古盐度重建。马fe盆地页岩B/Ga值为<3, Sr/Ba值为<0.2, S/TOC值为<0.1, TOC/S值为>6,元素比值表明马fe盆地页岩沉积于淡水环境。热液活度比采用Sc/Cr,构建TOC / P和Co/Zn / TOC二元图,区分正常水、混合水和热液影响。Sc/Cr比值大于0.14,表明该区页岩沉积在正常的水环境中,未受热液作用的影响。TOC / P和Co/Zn / TOC二元判别图表明,所有页岩在沉积时期均未受到热液作用的影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Trace elements geochemistry, total organic carbon, palaeosalinity, and hydrothermal characteristics of the Cretaceous black shale in the Mamfe Basin (West Africa)

The shales of the Mamfe basin were geochemically analyzed to determine their paleosalinity and hydrothermal characteristics which existed at the time of their deposition. Elemental ratios such as boron/gallium (B/Ga), strontium/barium (Sr/Ba), and total sulphur/total organic carbon (S/TOC) and TOC/S were applied for paleosalinity reconstruction. The shales of the Mamfe basin show B/Ga is <3, Sr/Ba <0.2, and S/TOC is <0.1 and TOC/S >6 the values of the elemental ratio show that the Mamfe shales were deposited in a freshwater environment. For hydrothermal activities ratio, Sc/Cr was used and Binary diagrams TOC vs P and Co/Zn vs TOC were constructed to discriminate between normal water, mixed and hydrothermal influence. The Sc/Cr ratio was greater than 0.14 indicating that the shales in the Mamfe basin were deposited in a normal water environment with no influence from hydrothermal processes. The binary discriminant diagram of TOC vs P and Co/Zn vs TOC shows that all the shales were not influenced by any hydrothermal processes during the time of their deposition.

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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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