古太平洋俯冲板块的残留物和碎片:地球化学和地球物理学的制约因素

IF 6 2区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY
Xisheng Xu, Zhouchuan Huang, Dingsheng Jiang, Gang Zeng, Li-Qun Dai
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引用次数: 0

摘要

中生代时期古太平洋板块的俯冲和后退是中国东部大陆边缘演化的关键动力。它导致了中国东北地区大陆地壳的横向增生、华北克拉通下岩石圈的破坏以及华南地区大量长岩浆岩的生成。这对东亚大陆边缘的深层物质循环和表生环境系统的演化产生了深远的影响。为了全面了解古太平洋板块俯冲和回滚过程中动力机制的转变,我们试图追踪古太平洋板块俯冲后在深海中的残余和碎片。利用地球化学和地球物理方法可以从时间和空间两个维度追踪这些残余物。对中国东部大陆玄武岩中微量元素、镁锌同位素和Os-Nd-Hf-Pb-O同位素的研究揭示了大量古太平洋板块俯冲的遗迹,最初的俯冲可以追溯到早侏罗世。大规模地球物理成像揭示了东亚下地幔中的大量高速异常。值得注意的是,许多被恰当地称为 "板坯墓地 "的高速岩体都坐落在下地幔的底部。下地幔上部还存在许多孤立的高速异常,为俯冲板块下降到下地幔创造了通道。然而,下地幔内俯冲板块残余的分辨率很低。因此,它们对下地幔动力学的影响还有待深入研究。最后,目前观测到的东亚大地幔楔(BMW)是在新生代太平洋板块俯冲作用下形成的。然而,随着古太平洋板块的后退(始于 145 Ma),白垩纪的大地幔楔系统也将在东亚地幔过渡带上方形成。东亚大陆边缘不同地区的构造-岩浆过程以及盆地形成和碳氢化合物聚集过程存在显著差异。这种差异可能受古太平洋板块滚回速度和角度变化的控制。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Remnants and fragments of the subducted paleo-Pacific plate: Constraints from geochemistry and geophysics

The subduction and rollback of the paleo-Pacific plate during Mesozoic time was the key engine for the evolution of the continental margin in eastern China. It led to lateral accretion of continental crust in Northeast China, lithospheric destruction beneath the North China Craton, and the generation of huge volumes of felsic magmatic rocks in South China. This had a profound influence on deep material cycles and the evolution of epigenetic environmental systems along the continental margin of East Asia. To fully understand the transformation of the dynamic mechanism during the subduction and rollback of the paleo-Pacific plate, we have attempted to trace the remnants and fragments of the subducted paleo-Pacific plate at great depths. Such remnants in both temporal and spatial dimensions can be tracked by using geochemical and geophysical approaches. Studies of the trace elements, Mg-Zn isotopes and Os-Nd-Hf-Pb-O isotopes in continental basalts from eastern China reveal a significant number of the remnants of subduction of the paleo-Pacific plate, and the initial subduction can be traced back to the Early Jurassic. Large-scale geophysical imaging unveils a multitude of high-velocity anomalies in the lower mantle of East Asia. Notably, many high-velocity bodies, aptly referred to as “slab graveyards”, are nestled at the base of the lower mantle. Numerous isolated high-velocity anomalies are also present in the upper part of the lower mantle, creating conduits for the descent of the subducted slabs into the lower mantle. However, a resolution of the remnants for the subducted slabs within the lower mantle are quite low. Consequently, their impact on the lower mantle’s dynamics is yet to be thoroughly investigated. Finally, the presently observed big mantle wedge (BMW) in East Asia has developed through subduction of the Pacific plate in the Cenozoic. However, following the rollback of the paleo-Pacific plate (began at ∼145 Ma), a Cretaceous BMW system would also form above the mantle transition zone in East Asia. There are significant differences in tectonic-magmatic processes and basin-forming and hydrocarbon-accumulation processes among different regions along the East Asian continental margin. Such differences may be controlled by variations in the speed and angle of rollback of the paleo-Pacific plate.

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来源期刊
Science China Earth Sciences
Science China Earth Sciences GEOSCIENCES, MULTIDISCIPLINARY-
CiteScore
9.60
自引率
5.30%
发文量
135
审稿时长
3-8 weeks
期刊介绍: Science China Earth Sciences, an academic journal cosponsored by the Chinese Academy of Sciences and the National Natural Science Foundation of China, and published by Science China Press, is committed to publishing high-quality, original results in both basic and applied research.
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