Amphibole's Influence on Mid-Lithosphere Discontinuity: Insights From Electrical Conductivity

IF 4.6 1区地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

Geophysical Research Letters Pub Date : 2025-02-28 DOI:10.1029/2024GL113651

Kewei Shen, Duojun Wang, Rui Zhang, Guangchao Chen, Kenan Han, Peng Chen, Ruixin Zhang, Zhiqing Zhang

引用次数: 0

Abstract

The potential role of metasomatism-induced hydrated layers, such as amphibole, in causing the mid-lithospheric discontinuities (MLDs) has been widely debated. To determine whether amphibole is the compositional cause of the MLDs, we measured the electrical conductivity of mixtures of olivine and various proportions of amphiboles under high pressures and temperatures. Our results showed that the amphibole reacted with the olivine at >1,023–1,173 K. Comparison of the geophysical observations with the electrical structure profiles calculated from this study constrained the amphibole contents of 20%–29% in MLDs in North China and South Australia, which may induce a 2.2%–3.1% reduction in seismic velocity.

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角闪孔对中岩石圈不连续性的影响：来自电导率的启示

交代作用引起的水合层（如角闪孔）在引起中岩石圈不连续（MLDs）中的潜在作用一直备受争议。为了确定角闪石是否为mds的组成原因，我们在高压和高温下测量了橄榄石和不同比例的角闪石混合物的电导率。结果表明，角闪石在1023 ~ 1173 K的温度下与橄榄石发生反应。地球物理观测结果与本研究计算的电性结构剖面相比较，限制了华北和南澳大利亚MLDs中20% ~ 29%的角闪孔含量，这可能导致地震速度降低2.2% ~ 3.1%。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

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.