Unraveling the Geodynamic Evolution of the Pre– and Early–Andean Margin: Insights From Numerical Modeling

IF 4.6 1区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY Geophysical Research Letters Pub Date : 2024-11-08 DOI:10.1029/2024GL110360
Harim Arvizu, Vlad Constantin Manea, Verónica Oliveros, Paulina Vásquez
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Abstract

An outstanding question in the geological evolution of the Chilean Andes is the cause of the westward shift and relocation of magmatism from the High Andes (HA) to the Coastal Cordillera (CC) during the Late Triassic, Pre–Andean stage. The spatiotemporal distribution of Permian–Triassic–Jurassic igneous rocks in northern-central Chile (20°S–32°S) reveals a significant westward magmatic shift of ∼120 km during the Norian time. Despite diverse proposed models, the precise geodynamic mechanism behind this shift remains unclear. To address this, we used 2D numerical modeling to investigate two contrasting scenarios: (a) subduction rollback and (b) subduction transference/jump and reinitiation by terrane accretion. Our modeling results strongly support Scenario B, where mantle density and the size of the oceanic plateau are crucial for triggering subduction jump and reinitiation. This model aligns with geological and geophysical evidence and offers new insights into unraveling the Pre– and Early–Andean evolution.

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揭示前安第斯和早安第斯边缘的地球动力演变:数值建模的启示
智利安第斯山脉地质演化中的一个悬而未决的问题是,在晚三叠世前安第斯山脉阶段,岩浆活动从高安第斯山脉(HA)西移和迁移到沿海科迪勒拉山系(CC)的原因。智利中北部(20°S-32°S)二叠纪-三叠纪-侏罗纪火成岩的时空分布显示,在诺尔纪,岩浆活动向西移动了 120 千米。尽管提出了多种模型,但这一转变背后的确切地球动力机制仍不清楚。为了解决这个问题,我们利用二维数值模拟研究了两种截然不同的情况:(a) 俯冲回滚;(b) 俯冲转移/跳跃,并通过陆相沉积重新启动。我们的建模结果强烈支持方案 B,即地幔密度和大洋高原的大小是触发俯冲跃迁和再启动的关键。该模型与地质和地球物理证据相吻合,为揭示前安第斯山和早安第斯山的演化提供了新的视角。
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来源期刊
Geophysical Research Letters
Geophysical Research Letters 地学-地球科学综合
CiteScore
9.00
自引率
9.60%
发文量
1588
审稿时长
2.2 months
期刊介绍: Geophysical Research Letters (GRL) publishes high-impact, innovative, and timely research on major scientific advances in all the major geoscience disciplines. Papers are communications-length articles and should have broad and immediate implications in their discipline or across the geosciences. GRLmaintains the fastest turn-around of all high-impact publications in the geosciences and works closely with authors to ensure broad visibility of top papers.
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