Interaction Between Plate Convergence and Fan Sedimentation:GLORIA Side-Scan Sonar and Seismic Data from the Northern Colombian Convergent Margin

板块辐合与扇形沉积之间的相互作用:来自哥伦比亚北部辐合边缘的 GLORIA 侧扫声纳和地震数据

• 批准号: 9000536
• 负责人: Jeffrey Weissel
• 金额: $ 13.96万
• 依托单位: Columbia University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1990
• 资助国家: 美国
• 起止时间: 1990-04-01 至 1992-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9000536&HistoricalAwards=false
• 关键词: Interaction; Between; Plate; Convergence; Fan

The Principal Investigator will investigate the absence of deformation on the Magdelena fan, located on the northern Colombian convergent margin, using GLORIA images and single-channel seismic data collected in the summer of 1989 on the RRS Charles Darwin. Two competing models have been proposed to explain the lack of shortening on the fan. One proposes that the low surface slope of the fan suppresses deformation; thus sedimentation rates would alter the geometry of compressional deformation. In the other model, block tectonics in northern South America creates different amounts of convergence along the various blocks. If the block-boundary faults continue offshore across the active accretinary wedge then the amount of convergence should change across block boundaries. These models will be tested by determining the geometry, and rates and timing of the deformation near the edges of the fan.

首席研究员将使用 GLORIA 图像和 1989 年夏天在 RRS 查尔斯·达尔文 (RRS Charles Darwin) 上收集的单道地震数据来调查位于哥伦比亚北部辐合边缘的马格德莱纳扇是否存在变形。人们提出了两种竞争模型来解释风扇没有缩短的原因。一种提出风扇的低表面坡度抑制变形； 因此，沉降速率会改变压缩变形的几何形状。在另一个模型中，南美洲北部的块体构造沿各个块体产生了不同程度的聚合。如果块体边界断层继续穿过活动增生楔向近海延伸，那么收敛量应该在块体边界上发生变化。 这些模型将通过确定风扇边缘附近的几何形状、变形速率和时间来进行测试。