First evidence of sinter and travertine in Cameroon: fault reactivation and geothermal implications

IF 2 4区地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY

Comptes Rendus Geoscience Pub Date : 2023-09-28 DOI:10.5802/crgeos.230

Milan Stafford Tchouatcha, Arnaud Patrice Kouske, Primus Azinwi Tamfuh, Alain Préat, René Toyama, Roger Feumba, Vannelle Tiokeng Ngounfack, Vivant Madjingain, Yaya Berinyuy Konglim, Rigobert Tchameni

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引用次数: 0

Abstract

The Laopanga hot spring deposits along the “Cameroon Volcanic Line” (CVL) are distinctive in being both siliceous sinter and travertine, made up of immature amorphous silica and mainly calcite, and associated with detrital deposits such as claystone, sandstone and conglomerate. Their age range from Plio-Pleistocene to Actual. Sr concentrations (17 to 2304 ppm) suggest an enrichment by epithermal outflows. δ 13 C and δ 18 O values, ranging respectively from 1.5‰ to 2.9‰ V-PDB and -10.1‰ to -6‰ V-PDB, reflect a high temperature of the parent solution (40 °C) related to an elevated geothermal gradient. The europium anomalies values (Eu/Eu*: 0.54–1.78) indicate the temperature variation of precipitated deposits related to distance of the deep hot water flow. The chemical compositions of the lithofacies show the diversity of the spring deposits related to complex phenomena of internal migration of mineralized hot water and the tectonic controls during the Precambrian fault reactivations.

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喀麦隆烧结矿和石灰华的第一个证据:断层活化和地热意义

沿“喀麦隆火山线”(CVL)的老盘加温泉矿床具有硅质烧结矿和钙华矿的特点，主要由未成熟的无定形二氧化硅和方解石组成，并伴有粘土岩、砂岩和砾岩等碎屑矿床。它们的年龄范围从上新世-更新世到实际。Sr浓度(17 ~ 2304 ppm)表明由低温热液流出物富集。δ 13c和δ 18o值分别在1.5‰~ 2.9‰V-PDB和-10.1‰~ -6‰V-PDB范围内，反映了母液温度偏高(40℃)，与地温梯度升高有关。铕异常值(Eu/Eu*: 0.54 ~ 1.78)反映了沉积物温度随深层热水流动距离的变化。岩相化学组成显示出泉水沉积的多样性，与成矿热水内部运移的复杂现象和前寒武纪断裂复生的构造控制有关。

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来源期刊

Comptes Rendus Geoscience 地学-地球科学综合

CiteScore

2.80

自引率

14.30%

发文量

审稿时长

5.9 weeks

期刊介绍： Created in 1835 by physicist François Arago, then Permanent Secretary, the journal Comptes Rendus de l''Académie des sciences allows researchers to quickly make their work known to the international scientific community. It is divided into seven titles covering the range of scientific research fields: Mathematics, Mechanics, Chemistry, Biology, Geoscience, Physics and Palevol. Each series is led by an editor-in-chief assisted by an editorial committee. Submitted articles are reviewed by two scientists with recognized competence in the field concerned. They can be notes, announcing significant new results, as well as review articles, allowing for a fine-tuning, or even proceedings of symposia and other thematic issues, under the direction of invited editors, French or foreign.