New advances in the stratigraphy and geochemistry of the German Turonian (Late Cretaceous) tephrostratigraphic framework
New advances in the stratigraphy and geochemistry of the German Turonian (Late Cretaceous) tephrostratigraphic framework
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德国土伦阶（晚白垩世）陆地地层格架地层学和地球化学新进展
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发表时间：
2004
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通讯作者：
D. Wray
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文献类型：
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作者：
F. Wiese;C. Wood;D. Wray
德国土伦阶地层框架中五种膨润土中最低的 T C 首次可以从 Sohlde-Loges 采石场（下萨克森州）的 Rotplaner（红色石灰石）标准剖面与附近 Woltwiesche 采石场和 Hoppenstedt 采石场（萨克森-安哈尔特州）的高度浓缩、近膨胀的序列进行关联。第二种膨润土 T C2 最近才在 Sohlde-Loges 发现，现在在 Woltwiesche 以及 Salzgitter-Salder 采石场和 Floteberg 路堑（均位于下萨克森州）的远端/扩展白色石灰岩序列中发现。 T C2 可以很容易地位于主要岩相变化（本文称为基底上土兰相翻转）上方的短距离处，使其成为一个等时标记，允许凝结的近涌和扩展的盆地部分之间的相关性。在此基础上，之前在霍彭斯泰特被识别为 T C 的膨润土必须重新指定为 T C2 。对下萨克森州和萨克森-安哈尔特州发现的所有五种膨润土的主量、微量和稀土元素 (REE) 数据的检查表明，可以在某种程度上区分它们。 膨润土 T C 和 T C2 在地球化学上相似并且可与 T D 分离，而 T D 本身又不同于 T E 和 T F 。
The lowest of the five bentonites in the German Turonian tephrostratigraphic framework, T C , can be correlated for the first time from the Rotplaner (red limestone) standard section in the Sohlde-Loges Quarry (Lower Saxony) to highly condensed, near-swell successions of the nearby Woltwiesche Quarry and the Hoppenstedt Quarry (Saxony-Anhalt). A second bentonite, T C2 , only recently recognised at Sohlde-Loges, is now identified at Woltwiesche and in the distal/expanded white limestone successions of the Salzgitter-Salder Quarry and the Floteberg road-cutting (both Lower Saxony). T C2 can easily be located a short distance above a major lithofacies change (herein termed the Basal Upper Turonian Facies Turnover), making it an isochronous marker permitting correlation between condensed nearswell and expanded basinal sections. On this basis, a bentonite, previously identified as T C at Hoppenstedt must be reassigned as T C2 . Examination of the major, trace, and rare-earth element (REE) data of all the five bentonites identified in Lower Saxony and Saxony-Anhalt shows that it is possible to discriminate between them to some extent. Bentonites T C and T C2 are geochemically similar and separable from T D , which is itself distinct from T E and T F .