P. Moissette, F. Quillévéré, G. Kontakiotis, Danae Thivaiou, E. Koskeridou, A. Antonarakou, H. Drinia, M. MELINTE-DOBRINESCU, J. Cornée
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引用次数: 0
摘要
在罗得岛的阿尔汉格洛斯角,对两个沉积断面进行了研究,那里的更新世海洋沉积物在中生代基底的地角和地堑中形成。在那里,由于沉积物靠近崎岖的海岸地貌,以上层水深群落为特征的半下层沉积物与浅得多的动物成分混合在一起。生物地层分析表明,这些地段分别沉积于 1.8 至 0.9 Ma 之间和 1.8 至 1.6 Ma 之间。通过将浮游/底栖有孔虫比例与从现存底栖有孔虫、软体动物和浮游动物中选出的 31 个测深指标相结合,我们表明,尽管陡坡附近有利于异源动物的迁移,但在这些非典型环境中仍可重建相对的海平面波动。浅水成分(包括砾石和钙质藻类)在重力、海流和构造扰动的共同作用下向下迁移,这些作用促进了溺水(记录的最大洪水发生在约 1.7 Ma),然后在早更新世期间形成的以断层为界的古河谷抬升。中生代基底不规则的古地形引发了断面的急剧变化和断面之间的年龄差异,从而形成了不同的沉积环境,角砾岩上部为外侧至中部的海相沉积,古河谷中为上部的水成沉积。
Early Pleistocene upper bathyal communities in fault-bounded paleovalleys of the island of Rhodes (Greece)
Two sediment sections are investigated at Cape Arkhangelos, island of Rhodes, where Pleistocene marine sediments crop out in horsts and grabens of a Mesozoic basement. There, hemipelagic sediments characterized by upper bathyal communities are atypically mixed with much shallower faunal components because they were deposited close to rugged coastal landforms. Biostratigraphic analyses show that the sections were deposited between 1.8 and 0.9 Ma, and between 1.8 and 1.6 Ma, respectively. By combining the planktonic/benthic foraminiferal ratio with 31 bathymetric indicators chosen among extant species of benthic foraminifera, mollusks, and bryozoans, we show that relative sea-level fluctuations can be reconstructed in these atypical settings despite the proximity of steep slopes that favored transportation of allochthonous fauna. The shallow-water components (including gravels and calcareous algae) were transported downslope by the combined action of gravity, currents, and tectonic disturbance that promoted drowning (with a maximum flooding recorded at ca. 1.7 Ma) and then uplift of fault-bounded paleovalleys that formed during the Early Pleistocene. Abrupt facies changes and age differences between sections have been triggered by the irregular paleotopography of the Mesozoic basement, which fostered differential depositional settings, with outer to middle neritic deposits above the horsts and upper bathyal deposits in paleovalleys.
期刊介绍:
Quaternary Research is an international journal devoted to the advancement of the interdisciplinary understanding of the Quaternary Period. We aim to publish articles of broad interest with relevance to more than one discipline, and that constitute a significant new contribution to Quaternary science. The journal’s scope is global, building on its nearly 50-year history in advancing the understanding of earth and human history through interdisciplinary study of the last 2.6 million years.