Abstract

The paper continues a complex study of the Santonian–Campanian boundary of the Aksu-Dere and Kudrino-2 sections (Bakhchisarai region, Southwestern Crimea), the sedimentological and biostratigraphic data on which are provided in paper 1. This work presents the paleomagnetic, rock magnetic, and geochemical data on C and O stable isotopes. The ⁸⁷Sr/⁸⁶Sr values of limestones increase upward the section: from 0.70741 to 0.70752 in Aksu-Dere and from 0.70750 to 0.70755 in Kudrino-2. On the basis of the results, the outcrops are correlated and the Kudrino–Aksu-Dere composite section is compilled, in which we identified paleontological, paleomagnetic, and isotopic markers necessary for the identification of the Santonian–Campanian boundary. The biostratigraphic boundaries are calibrated against the geomagnetic reversal 34n–33r and the SCBE isotopic event; thus, the base of the Campanian Stage should be determined by the base of the Chron 33r. In the volume of the geological record of the Santonian–Campanian boundary, saturation in guide fossil forms, and complex study, the composite section matches the candidates for a Global Boundary Stratotype Section and Point of the Campanian in North Texas and Southern England. This allows us to propose it as one of the candidates of the stratotype or an auxiliary section of the lower boundary of the Campanian Stage.

中文翻译：

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Kudrino 和 Aksu-Dere 剖面（克里米亚西南部）Santonian-Campanian 边界的生物、化学和磁性地层学：Campanian 下边界层型的全球相关性和选择问题。2. 磁和化学地层学，讨论

摘要

本文继续对 Aksu-Dere 和 Kudrino-2 剖面（Bakhchisarai 地区，克里米亚西南部）的 Santonian-Campanian 边界进行复杂的研究，论文 1 中提供了沉积学和生物地层数据。这项工作介绍了古地磁、岩石C 和 O 稳定同位素的磁性和地球化学数据。在⁸⁷ SR / ⁸⁶石灰岩的 Sr 值在剖面向上增加：Aksu-Dere 从 0.70741 到 0.70752，Kudrino-2 从 0.70750 到 0.70755。在此基础上，对露头进行了对比，编制了 Kudrino-Aksu-Dere 复合剖面，其中我们确定了识别 Santonian-Campanian 边界所必需的古生物、古地磁和同位素标记。生物地层边界根据地磁反转 34n-33r 和 SCBE 同位素事件进行校准；因此，Campanian 阶段的基数应由 Chron 33r 的基数决定。在 Santonian-Campanian 边界的地质记录卷、引导化石形式的饱和和复杂的研究中，复合剖面与北德克萨斯和英格兰南部的全球边界层型剖面和坎帕尼亚点的候选区域相匹配。这使我们可以将其作为层型的候选者之一或坎帕阶下边界的辅助部分。