Using the Massive Messinian Erosion Event as a Natural Experiment to Study the Growth of a Shelfbreak Margin

利用大规模墨西拿侵蚀事件作为自然实验来研究货架边缘的增长

• 批准号: 9911866
• 负责人: Gregory Mountain
• 金额: $ 2.33万
• 依托单位: Columbia University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-07-01 至 2002-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9911866&HistoricalAwards=false
• 关键词: Using; Massive; Messinian; Erosion; Event

During the Messinian desiccation of the Mediterranean around 6 m.y. ago, exposed margins were severely eroded to a new base level ca. 2 km below present day sea level, leading to massive subaerial erosion of existing shelf platforms, transforming many margins into basinward dipping ramps. During the subsequent flooding these were then covered by aggrading to prograding Pliocene sediments. The PIs will participate in a French cruise and examine the Rhone River margin. This is a relatively young margin and is well preserved. The cruise will acquire multi-chammel seismic data, which, along with the existing daa, will be interpreted to reconstruct the architecture of the evolving margin, from canyon cutting and incision to late rdevelopment of the sediment wedges.

大约 6 年前，地中海发生麦西尼亚干旱。以前，暴露的利润被严重侵蚀到新的基准水平。低于当前海平面 2 公里，导致现有陆架平台发生大规模水下侵蚀，将许多边缘转变为向盆地倾斜的坡道。 在随后的洪水期间，这些区域随后被进积的上新世沉积物所覆盖。 PI 将参加法国巡游并检查罗纳河边缘。 这是一个相对年轻的边缘，保存完好。 该巡航将获取多通道地震数据，这些数据与现有的DAA一起将被解释以重建不断演变的边缘的结构，从峡谷切割和切割到沉积物楔的后期再发展。