Morphology and origin of the Challenger Deep in the Southern Mariana Trench
Morphology and origin of the Challenger Deep in the Southern Mariana Trench
复制标题
DOI：
10.1029/2001gl013595
复制
发表时间：
2002-05-15
影响因子：
5.2
通讯作者：
Ohara, Y
中科院分区：
文献类型：
--
作者：
Fujioka, K;Okino, K;Ohara, Y
[1]高分辨率的水深测量揭示了南马里亚纳海沟的详细地貌。在挑战者深部的海沟底部发现了明显的右台阶，N80°E走向的梯形深度。在南马里亚纳海沟的外部隆起上发现了地垒和地堡构造。这些结构以及海沟内外斜坡上的斜坡破坏与在其他深海海沟中观察到的特征相似。根据带状填图、形态分析和构造解释，我们认为南马里亚纳海沟是一条转换断层。南马里亚纳海沟下的斜太平洋/加洛林板块俯冲与马里亚纳海槽弧后扩张相结合，形成了右旋走滑应力体制下的梯形深部。我们确认，世界上最深的点位于挑战者深部的西部，属于梯队深部。
[1] A high resolution bathymetry survey reveals the detailed morphology of the Southern Mariana Trench. Distinct right stepping, N80degreesE trending en echelon deeps were found on the trench bottom within the Challenger Deep. Horst and graben structures were revealed on the outer swell of the Southern Mariana Trench. These structures, as well as slope-failure on the inner and outer slopes of the trench are similar to features observed in other deep sea trenches. We propose here that the Southern Mariana Trench is a transform fault based on swath mapping, morphological analysis and tectonic interpretation. The en echelon deeps formed in a right-lateral strike-slip stress regime related to oblique Pacific/Caroline Plate subduction under the Southern Mariana Trench combined with the Mariana Trough backarc spreading. We confirm that the world's deepest point lies in the western portion of the Challenger Deep, among the en echelon deeps.