High-resolution seismic, core, and chronological data from the Quaternary Golo deep-sea fans, offshore Corsica, France, give new insights into rates of submarine fan growth. Average vertical deposition rates for units that represent the Late Pleistocene glacial periods are 0.1–0.5 m/k.y. Glacial-age deposits are sand rich; in contrast, post-glacial deposits lack a significant sand fraction and are dominated by carbonate-rich mud. As a result, seismically constrained volumetric rates of deposition for glacial periods with low sea level and a subaerially exposed shelf are ∼0.23 km3/k.y., 2×–5× higher than rates during interglacials when sea level is high, the shelf is submerged, and sand is trapped in shallow-marine environments. At millennial time scales, variations in deposition rate reflect climate-driven sea-level changes, autogenic avulsion of river channels that extend across the shelf during low sea level, and autogenic avulsion of submarine channels that shift the locus of deposition laterally. Short-term deposition rates range from 8.6 m/k.y. at proximal portions of submarine fans to 0.4 m/k.y. along the distal fringe. Our data show that submarine fans can be dynamic environments with formation and evolution of levee-confined channels and lobe complexes in 103–104 yr, comparable to the time scales needed to form fluvial channel belts and delta lobes.

中文翻译：

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潜艇迷的增长速度有多快？科西嘉近海第四纪戈洛迷的见解

来自法国科西嘉岛近海第四纪 Golo 深海扇的高分辨率地震、岩心和年代学数据为海底扇生长速率提供了新的见解。代表晚更新世冰川期的单元的平均垂直沉积率为 0.1-0.5 m/ky 冰川时代沉积物富含沙；相比之下，冰川后沉积物缺乏重要的沙子部分，主要是富含碳酸盐的泥浆。因此，在海平面低和陆架暴露的冰川期，地震约束的体积沉积速率约为 0.23 km3/ky，比间冰期期间海平面高、陆架被淹没、沙子被困在浅海环境中。在千年时间尺度上，沉积率的变化反映了气候驱动的海平面变化，在低海平面期间延伸穿过陆架的河道的自体撕裂，以及横向移动沉积地点的海底通道的自体撕裂。短期沉积速率范围从海底扇近端的 8.6 m/ky 到沿远端边缘的 0.4 m/ky。我们的数据表明，海底扇可以是动态环境，在 103-104 年期间形成和演化堤防河道和叶状复合体，与形成河流河道带和三角洲叶状体所需的时间尺度相当。