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Role of sedimentation in continental rifting from comparing two narrow rift valleys the Salton Trough and Death Valley-California
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作者 Diane Doser Musa Hussein +1 位作者 Laura F. Serpa Aaron A. Velasco 《Natural Science》 2011年第11期927-935,共9页
To unravel the forces and better understand the processes that drive continental rifting, and to understand the role of sedimentation in promoting the rifting process, we compare;the different geological features of t... To unravel the forces and better understand the processes that drive continental rifting, and to understand the role of sedimentation in promoting the rifting process, we compare;the different geological features of two narrow rifts, the Salton Trough and Death Valley, California. According to our models, the Moho is 22 km deep to the southwest of the Salton Sea on US-Mexico border and it deepens to 30 km in the region west of the Salton Trough. In Death Valley, the Moho is 24 km deep in the central part of the basin and it deepens to 32 km outside of the basin. The dome shaped Moho in both rifts is suggested to be primarily the product of magmatic activity in the lower crust and upper mantle. Death Valley is narrow rift in the initial stage of rifting with several sedimentary basins 2 - 4 km deep. In Death Valley magmatic (thermal) forces appears to drive the rifting process. The Salton Trough is wider than Death Valley and is moving toward sea floor spreading. The depth of the sedimentary basins ranges from 8 - 10 km and a combination of thermal and sedimentation appears to drive rifting processes in the Salton Trough. 展开更多
关键词 CRUSTAL Models Data Incorporation MAGMATIC UNDERPLATING narrow riftS
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莺歌海盆地形成的约束条件及动力学模式 被引量:3
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作者 关成尧 赵国春 +1 位作者 刘翠 白相东 《科学技术与工程》 北大核心 2017年第29期8-18,共11页
莺歌海盆地的形成机制是理解南海构造演化和印支半岛构造演化的枢纽。一般认为莺歌海盆地为走滑拉分盆地。根据盆地分析表明莺歌海经过多期升降的特点,通过总结前人认识成果,确定盆地研究的约束条件;并指出莺歌海运动模式之确定应考虑... 莺歌海盆地的形成机制是理解南海构造演化和印支半岛构造演化的枢纽。一般认为莺歌海盆地为走滑拉分盆地。根据盆地分析表明莺歌海经过多期升降的特点,通过总结前人认识成果,确定盆地研究的约束条件;并指出莺歌海运动模式之确定应考虑的外围边界条件。以这些约束条件和外围边界力学条件为基础,讨论了莺歌海-印支地块活动模式的7种体制模式;并结合围区的主要事件序列,认为在38~25 Ma期间,主要是印支地块挤出和南海西北海盆的扩张导致的南海西缘断裂的左行走滑的运动;25~15 Ma之间,莺歌海围区的构造主要是西南次海盆的扩张,导致南海西缘断裂的右行走滑,莺歌海盆地反转;15~5.5 Ma之间的活动特性很可能是一个过渡,或者存在南北方向的伸展;而在5.5 Ma之后,红河断裂的右行走滑造就了莺歌海盆地的走滑拉分形貌。莺歌海盆地形成的主要机制不为走滑拉分,而是边界摩擦作用下的南北向伸展为主的被动伸展的窄裂谷盆地。 展开更多
关键词 莺歌海 盆地类型 边界摩擦裂谷 动力学模式 约束条件
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