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Palaeohydrogeological Evidences from Fracture Filling Minerals - Results from the Aspo/Laxemar Area

机译:来自骨折填充矿物质的古代脱发证据 - Aspo / Laxemar地区的结果

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摘要

Two different ETJ projects: the EQUIP project (Evidences from Quaternary Infills from Palaeohydrogeology) running from 1997 to 2000 and the ongoing PADAMOT-project (Palaeohydrogeological Data Analysis and Model Testing) have addressed the possibility of using fracture minerals as recorders of past hydrochemical and hydrogeological environments. The Swedish contribution in these two projects has concentrated on studies of fracture filling calcites from the Aspo/Laxemar area, southeast Sweden. The analyses applied in the two projects comprise stable isotope ratios of carbon and oxygen and strontium together with trace element contents and textural studies. The results obtained so far (mainly from the EQUIP project) show that several generations of calcite can be identified, chemical zoning is common, and the influence on calcite precipitation of fresh and marine water decreases with depth. It can be concluded that fine scale zoning, possible dissolution/redistribution of calcite, and the disturbances caused by drilling (where loose material which may contain young calcite precipitates were lost), introduce uncertainties in the recognition of different calcite generations. However, despite these problems it is indicated that calcite fracture fillings in Precambrian bedrock environments can add information e.g. concerning changes in groundwater chemistry and redox conditions in the past. The possibilities and problems with palaeohydrogeological interpretations are discussed based on the available data.
机译:两种不同的ETJ项目:从1997年至2000年运行的装备项目(来自古代羟基学的季雷虫草的证据)以及正在进行的班扬 - 项目(古代族藻数据分析和模型测试)已经解决了使用骨折矿物作为过去水化学和水文地质的记录仪的可能性环境。这两个项目中的瑞典贡献集中了从瑞典东南部的Aspo / Laxemar地区的骨折填充钙化石的研究。在两个项目中应用的分析包括碳和氧和锶的稳定同位素比例,以及微量元素含量和纹理研究。到目前为止所获得的结果(主要来自装备项目)表明,可以识别出几代方解石,化学分区是常见的,并且对新鲜和海洋水的方解石沉淀的影响随深度减少。可以得出结论,细尺分区,可以溶解/方解石的可溶解/再分配,以及钻孔引起的扰动(其中损失幼体沉淀物的松散材料),引入识别不同方解石几代的不确定性。但是,尽管存在这些问题,但它表明了前征管基岩环境中的方解石骨折填充物可以添加信息。关于过去的地下水化学和氧化还原条件的变化。基于可用数据讨论了古羟地理解释的可能性和问题。

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