Supplementary files for: Lithostratigraphy of the Neogene succession of the Danish North Sea

The Neogene of the Danish North Sea is more than 1200 m thick. Despite being penetrated by numerous wells, formal lithostratigraphic subdivision of this succession has previously been restricted to the lowermost part. This monograph presents a comprehensive lithostratigraphy of the offshore Neogene of Denmark, in part extending recognised onshore units into the offshore realm. The mainly Lower Miocene deltaic deposits are referred to the Ribe Group, which is subdivided into six formations: the Klintinghoved, Bastrup, Arnum, Odderup, Dany (new) and Nora (new) Formations. The lowermost Miocene Vejle Fjord and Billund Formations known from the onshore lithostratigraphy are absent in the offshore wells. The dominantly fully marine Middle and Upper Miocene sediments are referred to the Måde Group, subdivided into the Hodde, Ørnhøj, Gram, Marbæk and Luna (new) Formations; the Luna Formation includes the Lille John Member (new). The Pliocene deltaic deposits are referred to the Eridanos Group (new), which is subdivided into the Vagn (new), Emma (new) and Elin (new) Formations. The depositional history of the Neogene of the Danish North Sea sector is presented based on a detailed reconstruction of subsurface morphology by the mapping of stratigraphical surfaces dated by biostratigraphy. During the Early Miocene, deposition in the Danish North Sea was dominated by progradation from Scandinavia; large deltas built out into the Danish onshore area from the north and north-east. West of the main deltas, muddy contourites periodically accumulated on the slope, accentuating shelf progradation. The Middle and Late Miocene period was mostly characterised by fully marine conditions and deposition of mud. By the end of the Miocene, progradation of delta systems from Scandinavia into the North Sea resumed, and the shoreline reached the westernmost part of the Danish North Sea sector. During the Pliocene, new source areas in central and eastern Europe, such as the Carpathian Mountains, were activated and a huge delta system, the so-called Eridanos Delta, began to fill the North Sea Basin from the east and the south-east. Due to increased subsidence of the basin associated with the loading of sediments of the Eridanos Delta, the northern systems were flooded. Although the Danish North Sea thus mainly received sediments from central Europe during the Pliocene, progradation from Scandinavia resumed at the end of the Pliocene.

丹麦北海的新近纪（Neogene）地层厚度逾1200米。尽管该地层序列已被多口钻井揭露，但此前其正式岩石地层划分仅局限于最下部层位。本专著系统构建了丹麦近海新近纪的完整岩石地层框架，将已确立的陆上地层单元部分拓展至近海领域。这套以早中新世三角洲沉积为主的地层归属于里贝群（Ribe Group），该群划分为6个组：克林廷霍夫组（Klintinghoved）、巴斯楚普组（Bastrup）、阿尔努姆组（Arnum）、奥德鲁普组（Odderup）、达尼组（Dany，新建）与诺拉组（Nora，新建）。陆上岩石地层中已知的下中新统维勒峡湾组（Vejle Fjord）和比隆组（Billund）在近海钻井中并未出现。以全海相沉积为主的中、上中新统地层归属于莫德群（Måde Group），该群划分为霍德组（Hodde）、厄恩霍伊组（Ørnhøj）、格拉姆组（Gram）、马巴克组（Marbæk）与卢纳组（Luna，新建）；卢纳组包含新建的里尔约翰段（Lille John Member）。上新世三角洲沉积则归属于新建的埃里达诺斯群（Eridanos Group），该群划分为瓦格组（Vagn，新建）、艾玛组（Emma，新建）与埃林组（Elin，新建）。丹麦北海区块新近纪的沉积演化历史，基于通过生物地层学（biostratigraphy）定年的地层界面编图所完成的精细地下形貌重建得以呈现。早中新世时期，丹麦北海的沉积作用以斯堪的纳维亚物源的进积作用（progradation）为主导：大型三角洲从北部与东北部向丹麦陆上区域推进。主三角洲西侧的斜坡上周期性堆积泥质等深岩（contourites），进一步加剧了陆架的进积过程。中、晚中新世时期的沉积环境以全海相为主，沉积物以泥质为主。至中新世末期，源自斯堪的纳维亚的三角洲系统重新向北海进积，海岸线抵达丹麦北海区块的最西端。上新世时期，中欧与东欧的新物源区（如喀尔巴阡山脉）被激活，巨型三角洲系统——即所谓的埃里达诺斯三角洲（Eridanos Delta）——开始从东部与东南部充填北海盆地。受埃里达诺斯三角洲沉积物加载引发的盆地沉降加剧影响，北部的沉积体系被海水淹没。尽管上新世丹麦北海的沉积物主要源自中欧，但在上新世末期，源自斯堪的纳维亚的进积作用再次恢复。