哥伦布盆地(西地中海)下中下地壳韧性颈缩的地震证据

IF 2.2 3区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY
Terra Nova Pub Date : 2023-05-20 DOI:10.1111/ter.12664
A. Ramos, A. Pedrera, J. García-Senz, B. Lopez-Mir, R. Salas
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引用次数: 0

摘要

科伦布雷茨盆地是地中海西部巴伦西亚海槽最大的中生代裂谷盆地。地震反射调查的分析使重建沉积盆地下方的构造组构成为可能,包括下地壳顶部和莫霍面的结构。研究表明,中下地壳的韧性变形是控制盆地几何结构的主要机制,中地壳的径向流动与两条大偏移的西南倾正断层的复活同时发生,这两条断层继承自二叠纪-三叠纪裂谷作用。中下地壳颈缩发生在主要沉积中心下方,紧接在超伸展之前。我们的研究结果为裂谷作用期间圆形盆地的形成和依赖深度的伸展过程的演变提供了新的见解。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Seismic evidence for ductile necking of the mid‐lower crust beneath the Columbrets Basin (Western Mediterranean)
The Columbrets Basin is the largest Mesozoic rift basin of the Valencia Trough in the Western Mediterranean. The analysis of a seismic‐reflection survey makes it possible to reconstruct the tectonic fabric underlying the sedimentary basin, including the structure of the top of the lower crust and the Moho. It is proposed that the ductile deformation of the mid‐lower crust was the main mechanism controlling the basin geometry, with the radial flow of mid‐lower crust coeval with the reactivation of two large‐offset SW‐dipping normal faults, inherited from the precursor Permian–Triassic rifting. Mid‐lower crustal necking occurred below the major depocenters, immediately before hyperextension. Our results provide new insight into the formation of circular‐shaped basins and the evolution of depth‐dependent extensional processes during rifting.
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来源期刊
Terra Nova
Terra Nova 地学-地球科学综合
CiteScore
4.80
自引率
8.30%
发文量
59
审稿时长
2.3 months
期刊介绍: Terra Nova publishes short, innovative and provocative papers of interest to a wide readership and covering the broadest spectrum of the Solid Earth and Planetary Sciences. Terra Nova encompasses geology, geophysics and geochemistry, and extends to the fluid envelopes (atmosphere, ocean, environment) whenever coupling with the Solid Earth is involved.
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