Factors leading to sub-surface pan silcrete formation in north-central Botswana

IF 1.2 4区 地球科学 Q2 GEOLOGY South African Journal of Geology Pub Date : 2023-02-09 DOI:10.25131/sajg.126.0003
S. Ringrose, L. Cassidy, S. Diskin, S. Coetzee
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Abstract

New evidence was sought for sub-pan silcrete formation along the southern margin of Ntwetwe Pan in the Botswana Makgadikgadi basin. This was achieved by integrating drillhole and surface sample descriptions with element and isocon analysis. The silcrete deposit which lies ~1.0 m below the pan surface, comprises Ntane sandstone fragments and detrital infill, cemented by amorphous silica. The deposit probably evolved during sequential periods of palaeo-lake infilling and drying since at least the Mid-Pleistocene. Changes in basin water pH brought about during fresher water infill interspersed with brine evapo-concentration and later evaporative pumping, induced the mobilisation and precipitation of the silica cement immediately below the pan floor.
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导致博茨瓦纳中北部地表下泛硅混凝土形成的因素
为博茨瓦纳Makgadikgadi盆地ntwewe Pan南缘的亚盘粉砾岩形成寻找新的证据。这是通过将钻孔和地面样品描述与元素和等距分析相结合来实现的。砂砾岩矿床位于盘面以下约1.0 m处,由Ntane砂岩碎片和碎屑充填体组成,由无定形二氧化硅胶结。该沉积物可能至少从中更新世开始,在古湖泊充填和干燥的连续时期演化而成。淡水充注穿插卤水蒸发浓缩和后来的蒸发泵送过程中引起的盆地水pH值的变化,引起了盘底下方硅水泥的动员和沉淀。
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来源期刊
CiteScore
3.60
自引率
5.60%
发文量
18
审稿时长
>12 weeks
期刊介绍: The South African Journal of Geology publishes scientific papers, notes, stratigraphic descriptions and discussions in the broadly defined fields of geoscience that are related directly or indirectly to the geology of Africa. Contributions relevant to former supercontinental entities such as Gondwana and Rodinia are also welcome as are topical studies on any geoscience-related discipline. Review papers are welcome as long as they represent original, new syntheses. Special issues are also encouraged but terms for these must be negotiated with the Editors.
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