直布罗陀俯冲带正在侵入大西洋

Geology Pub Date : 2024-02-13 DOI:10.1130/g51654.1
João C. Duarte, Nicolas Riel, F. Rosas, Anton Popov, Christian Schuler, B. Kaus
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引用次数: 0

摘要

俯冲起始是威尔逊周期的基石。它标志着一个海洋生命周期的转折点,使其岩石圈被回收到地幔中。然而,在大西洋类型的海洋中形成新的俯冲带具有挑战性,因为这通常需要外力的作用,如来自附近俯冲带的板块拉力、远场压缩或羽流的冲击。尽管如此,大西洋已经有两个俯冲带,即小安的列斯群岛和斯科舍弧。这些俯冲带是由附近的太平洋俯冲带挤压而成的。直布罗陀弧是另一个俯冲带侵入大西洋的地方。这相当于在即将关闭的地中海盆地形成的俯冲带的直接迁移。尽管如此,很少有学者认为直布罗陀俯冲带仍然活跃,因为在过去的数百万年中,它的活动已经明显减慢。在这里,我们利用新的重力驱动地球动力学模型,再现了西地中海的演变,展示了直布罗陀弧的形成过程,并检验了它是否仍然活跃。结果表明,直布罗陀弧在经过一段时间的静止后,将向大西洋更远的地方扩展。这些模型还显示了从一个关闭的大洋(利古里亚洋)开始的俯冲带如何通过一个狭窄的大洋走廊迁移到一个新开放的大洋(大西洋)。俯冲入侵可能是大西洋型海洋中俯冲起始的一种常见机制,也是地球近期地质演变的一个基本过程。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Gibraltar subduction zone is invading the Atlantic
Subduction initiation is a cornerstone of the Wilson cycle. It marks the turning point in an ocean’s lifetime, allowing its lithosphere to be recycled into the mantle. However, formation of new subduction zones in Atlantic-type oceans is challenging, given that it commonly involves the action of an external force, such as the slab pull from a nearby subduction zone, a far-field compression, or the impact of a plume. Notwithstanding, the Atlantic already has two subduction zones, the Lesser Antilles and the Scotia arcs. These subduction zones have been forced from the nearby Pacific subduction zones. The Gibraltar arc is another place where a subduction zone is invading the Atlantic. This corresponds to a direct migration of a subduction zone that developed in the closing Mediterranean Basin. Nevertheless, few authors consider the Gibraltar subduction to be still active because it has significantly slowed down in the past millions of years. Here, we use new gravity-driven geodynamic models that reproduce the evolution of the Western Mediterranean, show how the Gibraltar arc formed, and test if it is still active. The results suggest that the arc will propagate farther into the Atlantic after a period of quiescence. The models also show how a subduction zone starting in a closing ocean (Ligurian Ocean) can migrate into a new opening ocean (Atlantic) through a narrow oceanic corridor. Subduction invasion is likely a common mechanism of subduction initiation in Atlantic-type oceans and a fundamental process in the recent geological evolution of Earth.
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