Upper Cretaceous of the Barranca (Navarra, northern Spain); integrated litho-, bio- and event stratigraphy. Part II: Campanian and Maastrichtian
Upper Cretaceous of the Barranca (Navarra, northern Spain); integrated litho-, bio- and event stratigraphy. Part II: Campanian and Maastrichtian
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巴兰卡上白垩纪（纳瓦拉，西班牙北部）；
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发表时间：
2000
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通讯作者：
T. Küchler
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作者：
T. Küchler
基于伊鲁尔顺附近的11个暴露，对巴兰卡东部（西班牙北方纳瓦拉）的坎帕尼亚至下马斯特里赫特阶地层进行了详细研究，并与巴兰卡西部和Oroz-Betelu地块（纳瓦拉）的同时代地层进行了对比。Barranca中出露的Sarasate组分为10段。沉积的影响，在最新的Santonian和早期Campanian的Anoz-Ollo盐结构的隆起。纳瓦拉的Campanian - Maastrichtian的特征是厚而相对完整的序列，包含生物地层学上重要的化石群（菊石，inoceramids，echinoids）。详细的逐床收集，使建立一个综合的分区计划与盆间的相关性的潜力。除了根据海胆和菊石-海胆组合划分的局部峰、局部岭和组合带外，还根据一个未命名的层段和以下10个菊石分带（PRZ）和组合带（AZ）划分了Scaphites acrycrepis III、S. hippocrepis III/ Menabites spp., Hoplitoplacenticeras marroti，Trachycaphites spiniger，Pseudoxybeloceras phaleratum，Nostoceras（Bostrychoceras）polyplocum，Trachycaphites pulcherrimus，N .（Didymoceras）archiacianum，N .（Nostoceras）hyatti和Pachydiscus neubergicus / Pachydiscus epiplectus。菊石分带显著地改进了现有的区域和所谓的欧洲标准分带方案。讨论了与其他西班牙地区（坎塔布里亚、布尔戈斯和圭普兹夸）、阿基坦（法国）、威斯特伐利亚和下萨克森萨克森（德国）以及维斯瓦河流域（波兰）的相关性。12个公认的生物事件，其特点是大量出现的不规则的棘状和单种，或分类上更多变，大多是异形菊石组合，是区域correlation. Three Offaster极大的interbasinal重要性，因为它们可以与德国，英国和北方爱尔兰。这些生物事件的起源是密切相关的海侵和海退脉冲在纳瓦拉，其中pomeli海侵我和crepis，subglobosa和polyplocum回归是最明显的。Santonian/Campanian边界的构造阶段与Wernigerode阶段有关。第二阶段的开始被放置在较低的上坎帕尼亚marroti带，第三阶段（UCTE）的开始在上部上坎帕尼亚polyplocum带。
Campanian to Lower Maastrichtian strata of the eastern Barranca (Navarra, northern Spain), based on 11 exposures near Irurzun, were investigated in detail and correlated with coeval strata of the western Barranca and the Oroz-Betelu Massif (Navarra). The Sarasate Formation exposed in the Barranca is divided into ten members. Deposition was influenced by uplift of the Anoz-Ollo salt structure during the latest Santonian and Early Campanian. The Campanian – Maastrichtian of Navarra is characterised by thick and relatively complete successions containing biostratigraphically significant fossil groups (ammonites, inoceramids, echinoids). Detailed bed-by-bed collecting has enabled the establishment of an integrated zonal scheme with potential for interbasinal correlation. In addition to local peak, partial range and assemblage zones, based on echinoids and ammonite – echinoid assemblages, an ammonite zonation, based on an unnamed interval and the following 10 partial range (PRZ) and assemblage zones (AZ) of Scaphites hippocrepis III, S. hippocrepis III/ Menabites spp., Hoplitoplacenticeras marroti , Trachyscaphites spiniger , Pseudoxybeloceras phaleratum , Nostoceras ( Bostrychoceras ) polyplocum , Trachyscaphites pulcherrimus , N . ( Didymoceras ) archiacianum , N . ( Nostoceras ) hyatti , and Pachydiscus neubergicus / Pachydiscus epiplectus , is presented. The ammonite zonation markedly refines both the existing regional and the so-called European standard zonal schemes. Correlation with other Spanish areas (Cantabria, Burgos and Guipuzcoa), the Aquitaine (France), Westphalia and Lower Saxony (Germany) and the Vistula valley (Poland) is discussed. Twelve of the recognised bio-events, characterised by mass-occurrences of irregular echinoids and of monospecific, or taxonomically more variable, mostly heteromorph ammonite assemblages, are significant for regional correlation. Three Offaster maxima are of interbasinal importance as they can be correlated to Germany, Great Britain and Northern Ireland. The origin of these bio-events is closely related to the transgressive and regressive pulses recognised in Navarra, of which the pomeli Transgression I and the hippocrepis , subglobosa and polyplocum regressions are the most pronounced. The tectonic phase at the Santonian/Campanian boundary is related to the Wernigerode Phase. The onset of the second phase is placed in the lower Upper Campanian marroti Zone, the onset of a third phase (UCTE) in the upper Upper Campanian polyplocum Zone.