Lower Upper Cretaceous standard section of the southern Münsterland (NW Germany): carbon stable-isotopes and sequence stratigraphy
Lower Upper Cretaceous standard section of the southern Münsterland (NW Germany): carbon stable-isotopes and sequence stratigraphy
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明斯特兰南部（德国西北部）下上白垩统标准剖面：碳稳定同位素和层序地层学
DOI：
10.1127/0078-0421/2012/0012
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发表时间：
2012
影响因子：
2.2
通讯作者：
Wilmsen
中科院分区：
文献类型：
--
作者：
Richardt;Wilmsen
位于明斯特兰白垩系盆地（MCB;德国西北部）东南边缘的两个地点（Anröchte和Werl钻孔）的两个岩心已逐层记录，并以0.5 m的间隔取样，用于化学地层学调查。详细的研究为建立“Haarstrang”地区上白垩统下部（下Cenomanian-中Coniacian）的标准剖面提供了新的资料。上白垩统的总厚度约为180米，包括在中土伦间隔的7.00-8.70米的重叠，并覆盖石炭纪地层。Anröchte岩心包含埃森绿砂、Baddeckenstedt和Brochterbeck地层以及Büren地层和Oerlinghausen地层下部（下Cenomanian-中Turonian下部）的沉积物，而Werl岩心穿透Oerlinghausen地层的中部和上部、在索斯特绿砂相发育的Salder地层、Erwitte地层和下Emscher地层（中Turonian下部-中Coniacian下部）。岩心的沉积位置相当近，导致了凝缩的岩相和相对较低的厚度，特别是对于Cenomanian。此外，新的结果需要对已建立的岩石地层方案进行微小的修订。根据碳稳定同位素数据，已确定两个核心部分的重叠。从同期的继承（例如，巴德肯施泰特，哈雷/威斯特法伦，Oerlinghausen，萨尔茨吉特-萨尔德和多佛）报告的所有同位素事件已被识别和相关的区域间。通过塞诺曼期，这些事件按升序排列为：位置模糊的LCE I-III事件、临时定位的Crippsi层事件和Mexanatus层事件、MCE I事件（仅存在MCE Ib峰）、Ernst等人意义上的MCE事件以及P/B Break、MCE II、Jukes-Browne、Amphidonte层和Monument同位素事件。Cenomanian Oceanic Anomanic Event MCE I和OAE 2/CTBE期间d13 C值的正偏移也得到了很好的代表。此外，Turonian间隔显示了霍利韦尔、Lulworth、Round Down、low-woollgari、Glynde、Pewsey、Lower和Upper Southerham、Caburn、Bridgewick、Hitch Wood和Navigation事件。在科尼亚阶，贝丁，光点和东崖事件的发展。具有重要意义的层序边界被观察为遗漏和/或侵蚀面，随后是明显的岩质泥灰岩层，其特征通常是突然的相变。主要的不整合面（SB Ce 1-5、SB Tu 1-5、SB Co 1）与海平面升降的三级海平面福尔斯有关，在许多白垩纪地区，特别是在欧洲，这些不整合面是众所周知的。
Two cores from two localities (Anröchte and Werl drill-holes) situated at the southeastern margin of the Münsterland Cretaceous Basin (MCB; NW Germany) have been logged bed-by-bed and sampled at 0.5 m-intervals for chemostratigraphic investigation. Detailed studies provide new data for establishing a standard section through the lower Upper Cretaceous (Lower Cenomanian–Middle Coniacian) of the “Haarstrang” area. The Upper Cretaceous succession has a thickness of about 180 m in total–including an overlap of 7.00–8.70 m in the Middle Turonian interval–and overlies strata of Carboniferous age. The Anröchte core contains sediments of the Essen Greensand, Baddeckenstedt and Brochterbeck formations as well as the Büren and the lower part of the Oerlinghausen formations (Lower Cenomanian–lower Middle Turonian), while the Werl core penetrates the middle and upper part of the Oerlinghausen Formation, the Salder Formation developed in Soest Greensand facies, the Erwitte and lower Emscher formations (lower Middle Turonian–Middle Coniacian). The rather proximal depositional position of the cores has resulted in condensed lithofacies and relatively low thicknesses, especially for the Cenomanian. Moreover, new results require minor revisions of the established lithostratigraphic scheme. Based on carbon stable-isotope data, an overlap of the two core sections has been identified. All isotope events reported from contemporaneous successions (eg, Baddeckenstedt, Halle/Westfalen, Oerlinghausen, Salzgitter-Salder and Dover) have been recognized and correlated inter-regionally. Through the Cenomanian, these are–in ascending order–the vaguely placed LCE I–III, the provisionally located Crippsi and Virgatus Beds events, the MCE I (only MCE Ib peak is present), the MCE sensu Ernst et al. as well as the P/B Break, MCE II, Jukes-Browne, Amphidonte Bed and Monument isotope events. The positive excursions of d13C values during the Cenomanian Oceanic Anoxic Event MCE I and OAE 2/CTBE is also well represented. Furthermore, the Turonian interval shows the Holywell, Lulworth, Round Down, low-woollgari, Glynde, Pewsey, Lower and Upper Southerham, Caburn, Bridgewick, Hitch Wood and Navigation events. In the Coniacian, the Beeding, Light Point and East Cliff events are developed. Sequence boundaries of major significance are observed as omission and/or erosion surfaces followed by conspicuous, lithoclastic marl layers and are often characterized by abrupt facies changes. Major unconformities (SB Ce 1–5, SB Tu 1–5, SB Co 1) are related to eustatic 3rd-order sea-level falls and are well known from many Cretaceous localities, particularly in Europe.
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