地幔源中的再生洋壳导致大洋盆地过度下沉:东南亚海洋地形的新视角

Geology Pub Date : 2024-04-23 DOI:10.1130/g52079.1
Fan Yang, Xiao-Long Huang, Yi‐Gang Xu, Le Zhang, Peng‐Li He, Yang Yu, Liang Liu
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引用次数: 0

摘要

与半空间冷却预测相比,大洋盆地的额外下沉被认为是对板块下沉引起的底层地幔对流的动态响应。在这里,我们发现中国南海洋中脊玄武岩(MORBs)源中再生大洋地壳(ROC)的比例明显升高(10%-20%),这说明再生大洋地壳堆积在一个封闭的上地幔范围内,可能是周围长期俯冲事件的结果。ROC中存在的这种岩性异质性导致地幔密度最多增加0.45%-0.90%,因此,与其他受动态地形影响的小盆地相比,南中国海海盆中观测到的过度沉降是其原因之一,而开阔洋的沉降主要是由于热冷却造成的。我们认为,上地幔中由 ROC 引起的密度变化,与地幔流引起的动态地形一起,对产生受俯冲板块影响的大洋盆地的地形异常至关重要。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Excessive subsidence of oceanic basins caused by recycled oceanic crust in the mantle source: A new perspective on the oceanic topography within Southeast Asia
Additional subsidence of oceanic basins compared to the half-space cooling prediction is thought to be a dynamic response to the underlying mantle convection induced by slab sinking. Here, we identified a significantly elevated proportion (10%−20%) of recycled oceanic crust (ROC) in the source of mid-ocean-ridge basalts (MORBs) from the South China Sea (SCS), illustrating the ROC accumulation within a confined upper-mantle range, possibly as a result of the long-term surrounding subduction events. The presence of this lithological heterogeneity in the ROC leads to an increase in mantle density by 0.45%−0.90% at most, thereby contributing to the observed excessive subsidence in the SCS basin when compared to other small basins affected by dynamic topography, while open oceans experience subsidence primarily due to thermal cooling. We propose that the ROC-induced density change in the upper mantle is crucial for generating the topographic anomalies in oceanic basins influenced by subducted slabs, alongside dynamic topography caused by mantle flow.
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