爱尔兰海盆地晚德芬世冰川海洋沉积物中的微型动物

Q4 Earth and Planetary Sciences Irish Journal of Earth Sciences Pub Date : 2022-01-07 DOI:10.3318/IRISJEARTSCIE.2019.04
J. Haynes, A. Mccabe, N. Eyles
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引用次数: 2

摘要

摘要:爱尔兰海盆地26个地点的细粒晚德芬世冰期海洋沉积物中几乎全有孔虫动物群,以Elphidium clavatum、Haynesina orbiculare、Cibicides lobatulus和Cibicides fletcheri为主。这种生物相是典型的浅水,北极环境,那里的冰川正在退缩。相对保存完好的冷水物种伴随着保存较差的温带物种,被认为是从海底早期沉积物中重新加工而来的。其中包括batava氨、falsobeccarii氨、Elphidium crispum和Elphidium a种。尽管在快速冰移过程中发生了冰运和冰边缘改造,并在整个流域范围内形成了混合的区系,但附属种在分布上表现出明显的地理差异。E. nitida仅限于爱尔兰东南部的站点,E. asklundi在盆地东侧的数量要少得多。派生的温带元素在爱尔兰东南部的站点也要强得多。来自比更新世更古老的地层的物种是罕见的。大部分在原地的冷水动物元素为晚德文世爱尔兰海冰川衰变循环期间广泛的冰川海洋条件提供了证据。扁叶藻(Elphidium clavatum)组合的优势是一次重大融水事件的标志,这可能与海平面上升打破主要冰川内融水水库周围的封条时,融水灾难性地释放到潮汐冰边缘有关。
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Microfaunas from Late Devensian glaciomarine deposits in the Irish Sea Basin
Abstract:Fine-grained, Late Devensian glaciomarine sediments from 26 sites in the Irish Sea Basin contain an almost exclusively foraminiferal fauna dominated by Elphidium clavatum, Haynesina orbiculare, Cibicides lobatulus and Cibicides fletcheri. This biofacies is typical of shallow-water, Arctic environments where glaciers are in retreat. The relatively well-preserved, cold-water species are accompanied by poorly preserved temperate species, considered to have been reworked from earlier deposits on the sea floor. These include Ammonia batava, Ammonia falsobeccarii, Elphidium crispum and Elphidium species A. Although ice transport and ice marginal reworking occurred during rapid ice withdrawal and produced a mixed fauna basin-wide, subsidiary species show marked geographical variation in distribution. E. nitida is restricted to the south-eastern Ireland stations and E. asklundi is much less numerous on the east side of the basin. The derived temperate element is also much stronger at sites in south-eastern Ireland. Species derived from beds older than the Pleistocene are rare. The largely in situ, cold-water faunal elements provide evidence for extensive glaciomarine conditions during the decay cycle of the Late Devensian Irish Sea glacier. The dominance of Elphidium clavatum assemblages is a signature for a major meltwater event which may be linked to catastrophic release of meltwater to tidewater ice margins when rising sea-level broke the seals around meltwater reservoirs within the main glacier.
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来源期刊
Irish Journal of Earth Sciences
Irish Journal of Earth Sciences Earth and Planetary Sciences-Earth and Planetary Sciences (all)
CiteScore
0.90
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发文量
2
期刊最新文献
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