Forearc Basin Stratigraphy Resulting From Syntectonic Sedimentation During Accretionary Wedge Growth: Insights From Sandbox Analog Experiments
Forearc Basin Stratigraphy Resulting From Syntectonic Sedimentation During Accretionary Wedge Growth: Insights From Sandbox Analog Experiments
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增生楔生长过程中同构造沉积产生的弧前盆地地层：来自沙箱模拟实验的见解
DOI：
10.1029/2019tc006033
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发表时间：
2020
期刊：
影响因子：
4.2
通讯作者：
Ashi Juichiro
中科院分区：
文献类型：
--
作者：
Noda Atsushi;Koge Hiroaki;Yamada Yasuhiro;Miyakawa Ayumu;Ashi Juichiro
弧前盆地地层学有望记录增生楔变形和生长模式的详细历史。然而，同构造盆地沉积和楔形体的生长之间的关系仍然知之甚少，包括楔形体的变形如何修改盆地地层以及同构造沉积如何影响楔形体的变形。本研究通过模拟砂箱实验再现了有无同构造沉积作用的增生楔。结果表明，盆地地层随增生楔生长方式的变化而变化。在楔状体生长以前缘加积相为主的情况下，沉积区向沟槽方向迁移。相反，俯冲阶段导致沉积层向陆倾斜，沉积中心向陆迁移。长时间的俯冲作用可使楔后盆地与楔顶盆地结合，并产生大面积的可容纳空间。两种盆地地层类型（沉积中心向沟迁移和向陆迁移）的出现反映了两种不同的变形类型（前锋增生阶段和俯冲阶段），这些差异可能取决于楔体内部和外部基底抗剪强度的对比，这是由于楔体沉积的时空变化造成的。作用在楔块底部的正应力的大小变化可能影响楔块的变形模式。这些结果表明，弧前盆地地层的影响，增长模式的增生楔，这本身是同构造沉积的影响。
Forearc basin stratigraphy is expected to record a detailed history of the deformation and growth pattern of an accretionary wedge. However, the relationship between syntectonic basin sedimentation and growth of a wedge remains poorly understood, including how deformation of the wedge modifies the basin stratigraphy and how syntectonic sedimentation influences deformation of the wedge. This study reproduced accretionary wedges with and without syntectonic sedimentation by analog sandbox experiments. The results show that basin stratigraphy varied with changes of the growth pattern of the accretionary wedge. In the case that wedge growth was dominated by frontal accretion phase, the depositional area migrated trenchward. In contrast, underthrusting phase caused the sediment layers to be tilted landward and the depocenter to migrate landward. A prolonged underthrusting can result in combining a retrowedge basin with a wedge top basin and yield a wide area of accommodation space. The occurrence of two types of basin stratigraphy (trenchward and landward migration of the depocenter) reflects the two different types of deformation (frontal accretion phase and underthrusting phase), and these differences possibly depend on a contrast in strength of the basal shear resistance between the inner and outer parts of the wedge due to temporal and spatial variations of sedimentation on the wedge. A change in the magnitude of normal stress acting on the wedge base likely influenced the mode of deformation of the wedge. These results suggest that forearc basin stratigraphy is influenced by the growth pattern of accretionary wedges, which is itself affected by syntectonic sedimentation.
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DOI：
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