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首页> 外文期刊>Neues Jahrbuch fur Geologie und Palaontologie. Abhandlungen >Jurassic radiolarians from cherty limestones below the Hallstatt salt mine (Northern Calcareous Alps, Austria)
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Jurassic radiolarians from cherty limestones below the Hallstatt salt mine (Northern Calcareous Alps, Austria)

机译：哈尔施塔特盐矿（奥地利北钙质阿尔卑斯山）下方的钙质石灰岩的侏罗纪放射虫

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摘要

In the Northern Calcareous Alps, Alpine Haselgebirge salt deposits of Permo-Triassic age are widely distributed and excavated. Their tectonic position is discussed very controversially as in situ or transported. One of the key points to solve the question of the emplacement of the Alpine salt deposits is to date the surrounding/underlying siliceous sedimentary rocks. We examined the radiolarian age of two samples (BNU and NUS) from the ends of boreholes at the Hallstatt salt mine in the Salzkammergut area, Austria. The samples are cherty limestones of the Ruhpolding Radiolarite Group which underlies the Alpine Haselgebirge. The well-preserved late Middle Jurassic radiolarian fauna from these boreholes consists of more than 63 species, including a new subspecies Gongylothorax favosus oviformis. Taking the occurrence of Zhamoidellum ovum, Stichomitra annibill, Gongylothorax favosus and Tricolocapsa fusiformis into consideration, the sample BNU is correlated to the lower horizon of the Protunuma lanosus subzone in the Lower or Middle Callovian of the Zhamoidellum ovum zone. The age determination clearly confirms that the Alpine Haselgebirge of the Hallstatt salt mine lies tectonically on top of radiolarites of the Bajocian to Lower Callovian to Upper Oxfordian Ruhpolding Radiolarite Group. The salt mine is overlain by the shallowing-upward sequence of the Plassen Carbonate Platform, of which sedimentation had started here in (Early) Kimmeridgian time. Therefore, the emplacement of the Alpine Haselgebirge can be estimated as Late Oxfordian to Early Kimmeridgian.
机译：在北部钙质阿尔卑斯山，二叠纪-三叠纪时代的高山哈塞尔奇伯盐矿床分布广泛并被开挖。它们的构造位置在原位还是运输方面都引起了很大争议。解决高山盐矿床位置问题的关键点之一是确定周围/下伏的硅质沉积岩的年代。我们检查了奥地利萨尔茨卡默古特地区哈尔施塔特盐矿钻孔末端的两个样本（BNU和NUS）的放射线虫年龄。样品是Ruhpolding放射性拉特岩群的乳白石灰石，该群是高山Haselgebirge的基础。这些钻孔中保存完好的中侏罗纪晚期放射虫动物群包括63种以上，其中包括新的亚种Gongylothorax favosus oviformis。考虑到卵生线虫，Stichomitra annibill，弓形虫和卵形毛线虫的发生，样品BNU与卵生线虫区下部或中部Callovian的Protunuma lanosus子区的较低层位相关。年龄的确定清楚地证实了哈尔施塔特盐矿的高山哈瑟尔吉伯奇岩在构造上位于巴约西亚至下卡洛维安至上牛津Ruhpolding放射性拉美岩组的放射性拉美岩之上。盐矿被Plassen碳酸盐岩平台的浅层向上序列所覆盖，该层的沉积始于（早期）Kimmeridgian时间。因此，可以将高山哈塞尔奇伯爵（Alsel Haselgebirge）的位置估计为晚期牛津时期至早期Kimmeridgian时期。

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