格陵兰东北部沃拉斯顿福地 Rødryggen-1 和 Brorson Halvø-1 号钻孔中上侏罗统至白垩系最下层的地层构造

IF 2 4区 地球科学 Q1 GEOLOGY Geus Bulletin Pub Date : 2023-12-21 DOI:10.34194/geusb.v55.8342
P. Alsen, S. Piasecki, H. Nøhr-Hansen, Sebastian Pauly, E. Sheldon, J. Hovikoski
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引用次数: 0

摘要

在格陵兰东北部沃拉斯顿福尔兰北部钻探的两个浅层岩心,提供了一个涵盖上金梅里德纪(上侏罗统)-巴雷姆纪(下白垩统)的组合剖面,包括伯恩比约格、林德曼斯布格特、帕纳托克斯比约格和斯特拉通比约格地层。在 Lindemans Bugt 地层中定义了一个新的岩石地层单元,即 Storsletten 成员。以黑色泥岩为主的岩层主要通过甲藻胞囊和氨虫来确定年代,而夹在黑色泥岩之间的帕尔纳托克斯-比约格层的钙质泥岩则通过钙质化石来确定年代。地层学显示,Rødryggen-1 号岩心的演替几乎是完整的,代表了盆地更深的位置,在这里,之前的沃拉斯顿福尔兰盆地东部模型所预测的最新侏罗纪裂谷高潮处的间断并不存在。相比之下,Brorson Halvø-1 岩心所代表的位置更靠近地块顶峰,在那里形成了不整合现象。这些岩心组合为北极地区的侏罗纪-白垩纪边界区间提供了一个关键的生物地层参考剖面。
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Stratigraphy of the Upper Jurassic to lowermost Cretaceous in the Rødryggen-1 and Brorson Halvø-1 boreholes, Wollaston Forland, North-East Greenland 
Two shallow cores drilled in northern Wollaston Forland, North-East Greenland, provide a combined section covering the upper Kimmeridgian (Upper Jurassic) – Barremian (Lower Cretaceous) and comprising the Bernbjerg, Lindemans Bugt, Palnatokes Bjerg and Stratumbjerg Formations. A new lithostratigraphic unit, the Storsletten Member, is defined within the Lindemans Bugt Formation. The black mudstone-dominated intervals are dated primarily by dinoflagellate cysts and ammonites, whereas the calcareous mudstones of the Palnatokes Bjerg Formation – sandwiched between the black mudstones – are dated by calcareous nannofossils. The stratigraphy demonstrates an almost complete succession in the Rødryggen-1 core, representing a deeper position in the basin, where the hiatus at the latest Jurassic rift climax predicted in previous models for the eastern Wollaston Forland Basin is absent. In contrast, the Brorson Halvø-1 core represents a position closer to a block crest where unconformities developed. In combination, the cores provide a key biostratigraphic reference section for the Jurassic–Cretaceous boundary interval in the Arctic.
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来源期刊
Geus Bulletin
Geus Bulletin GEOLOGY-
CiteScore
2.80
自引率
17.60%
发文量
8
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