巴塔哥尼亚大陆边缘与深切海底峡谷相关的现代混合（浊积岩-轮廓岩）沉积体系的形态与演化

IF 2.6 3区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY

Marine Geology Pub Date : 2025-02-01 DOI:10.1016/j.margeo.2025.107476

José I. Isola , Fermín I. Palma , Sebastían Y. Principi , Graziella Bozzano , Ornella Silvestri , Juan P. Ormazabal , Alejandro A. Tassone

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引用次数: 0

摘要

本研究将一种新型的多波束测深和高分辨率海底地震数据库与以往的工作相结合，研究了位于巴塔哥尼亚大陆边缘（PCM）的一个主要海底峡谷系统的晚第四纪混合（浊积岩-轮廓岩）沉积系统（MDS），该系统位于水深1500至4000 m之间。所研究的MDS具有独特和不寻常的特征，包括三个海底峡谷的顺坡偏移，峡谷下游形成的大丘状漂移（> 100ms TWT），以及在无峡谷斜坡区积累的小块状漂移（几十ms TWT）。这些特征的起源可以通过从轮廓岩到混合环境的时间替代以及沿坡和跨坡过程之间不同风格的相互作用来解释。峡谷的顺坡偏移与中更新世过渡期（MPT）后的下坡活动增加有关。在优势轮廓岩期（MPT前）形成的化石丘状形态对随后在下坡活动加剧期（MPT后）形成的海底峡谷形成了障碍，使它们沿斜坡偏离90°。在MPT之后，沿坡和跨坡过程之间的空间插入和相互作用产生了斑块状和丘状漂移。斑块漂移与无限制的环境有关，并被解释为混浊物被底流重新分布的结果。沿坡和跨坡过程之间的同步相互作用似乎在海底峡谷附近形成大型丘状漂流体中起了至关重要的作用。这项研究突出了mds的时空复杂性，并为它们在海底峡谷系统中的发展提供了新的见解。此外，本研究还探讨了晚第四纪深水块层化在PCM沉积物分布中可能发挥的作用。

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Morphology and evolution of a modern mixed (turbidite-contourite) depositional system associated with deeply-incised submarine canyons in the Patagonian Continental Margin

This study integrates a novel multi-beam bathymetry and high-resolution sub-bottom seismic database with previous works, to investigate a Late Quaternary Mixed (turbidite-contourite) Depositional System (MDS) related to a major submarine canyon system located on the Patagonian Continental Margin (PCM) between water depths of 1500 and 4000 m.

The studied MDS exhibits unique and unusual features, including the along-slope deviation of three submarine canyons, large-mounded drifts (>100 ms TWT) forming downstream of canyons, and small patchy drifts (a few tens ms TWT) accumulating in canyon-free slope areas. The genesis of these features is explained by a temporal substitution from contourite to mixed settings and different styles of interaction between along-slope and across-slope processes.

The along-slope deviation of the canyons is associated with the temporal substitution of contourite processes dominated period to the establishment of a MDS, marked by increased down-slope activity inferred to have occurred after the Mid-Pleistocene Transition (MPT). The fossil mounded morphologies developed during the dominant contourite period (pre MPT) acted as barriers to the subsequent submarine canyons formed during the increased down-slope activity period (post MPT), causing them to deviate by 90° along the slope.

After the MPT, spatial intercalation and interactions between along and across slope processes produced patchy and mounded drifts. The patchy drifts are associated with unconfined settings and are interpreted as the outcome of turbidites redistributed by bottom currents. Synchronous interactions between along-slope and across-slope processes appear to have played a crucial role in the formation of large, mounded drifts near submarine canyons.

This study highlights the temporal and spatial complexity of MDSs and provides new insights into their development within submarine canyon systems. Additionally, this work addresses the role that the stratification of deep-water masses could have played in the distribution of sediments along the PCM during the Late Quaternary.

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来源期刊

Marine Geology 地学-地球科学综合

CiteScore

6.10

自引率

6.90%

发文量

175

审稿时长

21.9 weeks

期刊介绍： Marine Geology is the premier international journal on marine geological processes in the broadest sense. We seek papers that are comprehensive, interdisciplinary and synthetic that will be lasting contributions to the field. Although most papers are based on regional studies, they must demonstrate new findings of international significance. We accept papers on subjects as diverse as seafloor hydrothermal systems, beach dynamics, early diagenesis, microbiological studies in sediments, palaeoclimate studies and geophysical studies of the seabed. We encourage papers that address emerging new fields, for example the influence of anthropogenic processes on coastal/marine geology and coastal/marine geoarchaeology. We insist that the papers are concerned with the marine realm and that they deal with geology: with rocks, sediments, and physical and chemical processes affecting them. Papers should address scientific hypotheses: highly descriptive data compilations or papers that deal only with marine management and risk assessment should be submitted to other journals. Papers on laboratory or modelling studies must demonstrate direct relevance to marine processes or deposits. The primary criteria for acceptance of papers is that the science is of high quality, novel, significant, and of broad international interest.