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首页> 外文期刊>Zeitschrift der Deutschen Gesellschaft fur Geowissenschaften: ZDGG >The travertines of B?ttingen and Laichingen (Miocene, Swabian Alb) - Archives for palaeo-thermal water circulation
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The travertines of B?ttingen and Laichingen (Miocene, Swabian Alb) - Archives for palaeo-thermal water circulation

机译：B的石灰华？Ttingen和Laichingen（Miocene，Swabian Alb） - 古古水循环的档案

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In the karst region of the "Schw?bische Alb" (Southwest Germany) travertines are quite different in appearance and genesis from the usual karst-mineralogical inventory.On top of two diatremes from the volcanic region of Urach-Kirchheim yellow and red travertines precipitated during the Middle Miocene.Two lithofacies types with different depositional characteristics can be distinguished: vertically bedded and banded travertine formed by ascending groundwater (fissure ridge travertine), and horizontally to domed porous travertine.Both types are separated by unconformities.The travertines are considered as palaeo-hydrogeological archives containing information of palaeo-fluids from which the travertines precipitated.Positive δ~(13)C values mark the contribution of magmatogenous carbonic acid.High Sr isotopes reveal a deep groundwater component that ascended from the crystalline basement.The fluid provenance coincides with water temperatures of slightly below 50 °C.By using the known fractionation between calcite and water the mean δ~(18)O_(H2O) of deep groundwater can be estimated to -1.2 ± 1.2 ‰ (VSMOW).It thus characterises little mobile formation water.The displacement of this water by meteoric water started at the earliest at the Upper Miocene during the profound change of geological conditions in Southern Germany.
机译：在“Schw？bische Alb”（德国西南部）的喀斯特地区，钙华的外观和成因与通常的喀斯特矿物学调查有很大不同。在乌拉赫-基尔希海姆火山区的两个层顶上，黄色和红色钙华在中新世中期沉淀。可以区分两种具有不同沉积特征的岩相类型：由上升的地下水（裂隙-脊状钙华）形成的垂直层状和带状钙华，以及水平至穹顶状多孔钙华。这两种类型都由不整合面隔开。钙华被认为是古水文地质档案，包含钙华沉淀的古流体信息。正的δ~（13）C值标志着岩浆成因碳酸的贡献。高Sr同位素揭示了从结晶基底上升的深层地下水成分。流体来源与略低于50°C的水温一致。利用方解石和水之间已知的分馏作用，深层地下水的平均δ~（18）O_（H2O）可估计为-1.2±1.2‰（VSMOW）。因此，它的特点是流动地层水很少。在德国南部地质条件的深刻变化期间，这种水最早在上中新世开始被大气降水置换。

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