Abstract

The most stratigraphically representative section of Turonian–Coniacian in the right-bank part of the Volga region is found at the Kamennyi Brod-1 section (Olkhovka district of Volgograd oblast). The subdivision of carbonate rocks into zones is based on the complexes of benthic foraminifera and other accompanying groups of invertebrates. Regressive-transgressive tendencies in the evolution of the Turonian–Coniacian basin is also reflected in the quantitative ratio between benthic and planktonic foraminifera. The earlier unknown representatives of Turonian and Coniacian marine biota are revealed: silicon sponges, crinoids, starfish, brittle stars, and brachiopods. The magnetostratigraphic (magnetopolar and petromagnetic) characteristic of the section is obtained, and the magnetic zone of anomalous polarity is revealed against the background of normal polarity (N). It is supposed that anomalous directions of magnetization represent the stabilized vector sum of oppositely directed components, one of which (corresponding to reverse polarity) is the primary one.

中文翻译：

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Kamennyi Brod-1断层（南部乌里扬诺夫斯克-萨拉托夫海槽）的Turonian-Coniacian矿床

摘要

伏尔加河地区右岸部分的土伦-哥尼亚古纪最具地层代表性的断层位于卡姆尼尼布罗德-1断层（伏尔加格勒州的奥克霍夫卡地区）。碳酸盐岩细分成带是基于底栖有孔虫和其他无脊椎动物群的复合体。底栖和浮游有孔虫的数量比也反映了土伦-哥尼亚盆地的演化中的海退趋势。揭示了土伦和科尼亚克海洋生物区系的较早的未知代表：硅海绵，海百合，海星，脆星和腕足动物。获得该断面的磁地层（磁极和石油磁）特征，并在正常极性（N）的背景下显示出极性异常的磁性区域。假定磁化的异常方向代表相反方向分量的稳定矢量和，其中一个分量（对应于反极性）是主要分量。