基于海洋孢粉学的挪威海大陆架Vestfjorden的Molo组中新世时代

IF 0.8 4区 地球科学 Q2 Earth and Planetary Sciences
K. Grøsfjeld, K. Dybkjær, T. Eidvin, F. Riis, E. Rasmussen, J. Knies
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引用次数: 3

摘要

对Vestfjorden/Lofoten附近6610/3-1探井Molo组下部的7个侧壁岩心样品进行了海洋地貌分析。从其他研究中获得的新物种的描述,以及从附近地点获得的具有独立年代地层学的参考序列,使Molo组在其北部分布区域的沉积年龄约束比以前实现的更可靠。新资料(如最低的鞭毛藻囊Barssidinium graminosum和Barssidinium pliocenicum,最高的鞭毛藻囊Minisphaeridium latirictum和Operculodinium piaseckii)为6610/3-1井Molo组的中新世时代提供了无可争议的证据。研究表明,6610/3-1井的Molo组是在中中新世晚期至晚中新世的侵蚀活动后开始聚集的。这些资料(特别是A. andallouisiensis andalousiensis甲藻囊、Barssidinium evangelineae和M. latirictum甲藻囊的共存以及L. lucifer甲藻的存在)表明,6610/3-1井Molo组在8.8 / 8.7 Ma左右开始积累。沉积物沉积在暖温带,受河流流量影响的高能环境中。在沉积过程中,较老的沉积物,特别是古近纪的沉积物,被广泛侵蚀。侵蚀和快速堆积可能与海平面上升下降和腹地/海岸带隆升/隆升的综合作用有关。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A Miocene age for the Molo Formation, Norwegian Sea shelf off Vestfjorden, based on marine palynology
Seven side-wall core samples from the lower part of the Molo Formation in exploration well 6610/3–1 off Vestfjorden/Lofoten have been reanalysed for marine palynomorphs. Description of new species from other studies and access to reference successions from nearby sites with an independent chronostratigraphy have enabled a more reliable depositional age constraint for the Molo Formation in its northern distribution area than previously achieved. The new data (e.g., the lowest occurrence of the dinoflagellate cysts Barssidinium graminosum and Barssidinium pliocenicum and the highest occurrence of the dinoflagellate cysts Minisphaeridium latirictum and Operculodinium piaseckii) provide incontrovertible evidence for a Miocene age for the Molo Formation in well 6610/3–1. Our data suggest that the Molo Formation in well 6610/3–1 started to accumulate after erosional activity which took place between the late middle Miocene and the late Miocene. The data (especially the presence of the dinoflagellate cyst A. andalouisiensis andalousiensis, the co-occurrence of the dinoflagellate cysts Barssidinium evangelineae and M. latirictum and the presence of the acritarch L. lucifer) suggest that the Molo Formation in well 6610/3–1 started to accumulate at around 8.8 / 8.7 Ma. The sediments were deposited in a warm temperate, high-energy environment influenced by river discharge. During deposition, older sediments, particularly from the Paleogene, became extensively eroded. The erosion and rapid accumulation were probably associated with the combined effects of eustatic sea-level fall and uplift/updoming of the hinterland/coastal zone.
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来源期刊
Norwegian Journal of Geology
Norwegian Journal of Geology 地学-地球科学综合
CiteScore
1.60
自引率
25.00%
发文量
0
审稿时长
>12 weeks
期刊介绍: The Norwegian Journal of Geology publishes high-quality, fully peer-review papers from all geoscientific disciplines. Papers are commonly based on regional studies and should emphasise the development of understanding of fundamental geological processes. More specialised papers can also be submitted, but should be written in a way that is easily understood by nonspecialists, and illustrate the progress being made within that specific topic in geosciences. We also encourage initiatives for thematic issues within the scope of the Journal.
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