Sediment flux variation as a record of climate change in the Late Quaternary deep‐water active Corinth Rift, Greece,Basin Research

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Sediment flux variation as a record of climate change in the Late Quaternary deep‐water active Corinth Rift, Greece
Basin Research ( IF 2.8 ) Pub Date : 2024-09-14 , DOI: 10.1111/bre.12896
Mohamed A. Mohamed ₁ , Richard E. L. Collier ₁ , David M. Hodgson ₁ , Rob L. Gawthorpe ₂ , Donna J. Shillington ₃ , Martin Muravchik ₂ , Dimitris Sakellariou ₄

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The value of deep‐water sedimentary successions as reliable records of environmental change has been questioned due to their long response times and sediment pathways leading to complex responses to climatic change and tectonic signals over differing timescales. We studied the Gulf of Corinth, Greece, to test the value of deep‐water stratigraphic successions as records of external controls on sediment flux in a setting with short response times and transport distances. The confinement of the rift basin allows for a near‐complete accounting of clastic sediment volumes. The recent acquisition of high‐resolution seismic reflection data, utilisation of International Ocean Discovery Programme Expedition 381 cores and a robust chronological framework, enable evaluation of the stratigraphy at a high temporal resolution. Combining borehole and high‐resolution seismic reflection data, distinct seismic units can be correlated to multiple paleoenvironmental proxies, permitting quantification of sediment flux variation across successive glacial–interglacial cycles at ca. 10 kyr temporal resolution. Trends in average sediment flux since ca. 242 ka show ca. 2–9 times greater sediment flux in cooler glacials compared to warmer interglacial conditions. The Holocene is an exception to low sediment flux for the interglacials, with ca. 5 times higher rates than previous interglacials. The short and steep configuration of the Sythas canyon and its fan at the base of an active submarine normal fault results in deep‐sea deposition at all sea‐level stands. In contrast, adjacent canyon systems shut down during warm intervals. When combined with palynology, results show that periods of distinct vegetation re‐organisation correlate to sediment flux changes. The temporal correlation of sediment flux to palynology in the Gulf of Corinth over the last ca. 242 kyr is evidence that variability of sediment supply is largely governed by climate‐related changes in hinterland catchments, with sea‐level and tectonics being second‐order controls on sediment flux variability.

中文翻译：

希腊晚第四纪深水活动科林斯裂谷的沉积物通量变化作为气候变化的记录

深水沉积序列作为环境变化可靠记录的价值受到质疑，因为它们的响应时间长，沉积路径导致对不同时间尺度的气候变化和构造信号的复杂响应。我们研究了希腊科林斯湾，以测试深水地层序列作为响应时间和运输距离短的背景下沉积物通量外部控制记录的价值。裂谷盆地的限制可以近乎完整地计算碎屑沉积物的体积。最近采集的高分辨率地震反射数据、利用国际海洋发现计划远征 381 岩心和强大的年代框架，能够以高时间分辨率评估地层学。结合钻孔和高分辨率地震反射数据，不同的地震单元可以与多个古环境代理相关联，从而可以量化大约 2000 年连续冰川-间冰期旋回中沉积物通量的变化。 10 kyr 时间分辨率。自大约以来平均沉积物通量的趋势242 ka 显示约。与较温暖的间冰期相比，较冷的冰川中的沉积物通量高出 2-9 倍。全新世是间冰期沉积物通量低的一个例外，大约为比之前的间冰期高出 5 倍。塞萨斯峡谷及其扇位于活跃的海底正断层底部的短而陡的构造导致所有海平面的深海沉积。相比之下，邻近的峡谷系统在温暖的时期会关闭。与孢粉学相结合，结果表明，不同的植被重组时期与沉积物通量的变化相关。过去约科林斯湾沉积物通量与孢粉学的时间相关性。 242 kyr 证据表明，沉积物供应的变化很大程度上受内陆流域气候相关变化的影响，海平面和构造是沉积物通量变化的二级控制因素。

更新日期：2024-09-14

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