Sea level and climatic controls on turbidite occurrence for the past 26 kyr on the flank of the Gaoping Canyon off SW Taiwan
Sea level and climatic controls on turbidite occurrence for the past 26 kyr on the flank of the Gaoping Canyon off SW Taiwan
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DOI：
10.1016/j.margeo.2017.08.011
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发表时间：
2017-10
期刊：
影响因子：
2.9
通讯作者：
Shun Yu;L. Tsai;P. Talling;A. Lin;H. Mii;San-hsiung Chung;C. Horng
中科院分区：
文献类型：
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作者：
Shun Yu;L. Tsai;P. Talling;A. Lin;H. Mii;San-hsiung Chung;C. Horng
海底峡谷是将源自大陆边缘的沉积物输送到深海的主要渠道。在这里，我们分析了海平面和气候变化(例如，沉积物供应)对过去26年KYR期间浊流频率的影响。我们的研究是基于台湾西南部高坪峡谷两侧2070米水深的MD178-10-3291岩芯浊积岩的高分辨率年龄控制。与世界上大多数其他海底峡谷不同，在最近的大陆架洪水期间，高坪峡谷的头部一直与河口相连。我们的结果表明，在海平面低水位期间，浑浊洋流较少出现。相比之下，自12年以来，在海平面和海平面高位上升的最后阶段，浑浊洋流更加频繁。这可能是由于降雨强度增强而导致的陆地泥沙输送增加所致。此外，与其他源汇系统相比，上一次冰期高坪峡谷两侧浊积物的出现可能受气候变化的影响更大，因为沉积物的储存/响应时间较短。
Submarine canyons are major conduits for delivery of sediments originating from the continental margin into the deep sea. Here we analyze the effects of changing sea levels and climate (e.g. sediment supply) on the frequency of turbidites over the last 26 kyr. Our study is based on high resolution age controls for turbidites in core MD178-10-3291 from a water depth of 2070 m on the flank of the Gaoping Canyon offshore in SW Taiwan. Unlike most other submarine canyons worldwide, the head of the Gaoping Canyon has remained connected to the river mouth during the recent flooding of the continental shelf. Our results reveal that turbidity currents are less frequent during periods of sea-level lowstand. In contrast, turbidity currents have been more frequent since ~ 12 kyr BP, during the final stage of rising sea level and sea-level highstands. This may be the result of increased terrestrial sediment delivery due to enhanced rainfall intensity. Moreover, comparing to other source-to-sink systems, the turbidite occurrence in the flank of Gaoping Canyon through the last glacial cycle might have been more strongly influenced by climatic changes due to short sediment storage/response time.