Detectable Continental Crust in the Earth's Deep Interior Inferred From Thermodynamic Modeling

IF 5.4 3区材料科学 Q2 CHEMISTRY, PHYSICAL

ACS Applied Energy Materials Pub Date : 2024-09-07 DOI:10.1029/2024GL111556

Yibing Li, Yi Chen, Richard M. Palin, Xiaobo Tian, Xiaofeng Liang, Lijun Liu

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Abstract

Compelling evidence indicates that continental crust can subduct to >300 km and even enter the mantle transition zone (MTZ). However, detecting continental materials within the deep Earth is challenging due to our incomplete knowledge about their physical properties at mantle conditions. We use a newly compiled mineral-physical database coupled with thermodynamic modeling to calculate seismic velocities of the subducted continental crust (SCC) beyond 150 km. Results show that the SCC has one seismically detectable window depth (300–390 km) with ∼4% V_P anomaly. Besides, the upper crust has another two window depths (<250 km and 610–660 km) with anomalies of −6.4%–−1.6% and −7.6%–−2.2%, and 3.6%–7.9% and 3.9%–8.6% for V_P and V_S compared to those of the ambient mantle, respectively. These predicted SCC characteristics match seismic anomalies at mantle depths and suggest subducted upper crust potentially contributing to the high-velocity anomalies in the MTZ.

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从热力学模型推断地球内部深处可探测到的大陆结壳

令人信服的证据表明，大陆地壳可以俯冲至300千米，甚至进入地幔过渡带（MTZ）。然而，由于我们对地幔条件下大陆物质的物理性质了解不全面，探测地球深处的大陆物质具有挑战性。我们利用新编制的矿物物理数据库，结合热力学建模，计算了 150 千米以外俯冲大陆地壳（SCC）的地震速度。结果表明，俯冲大陆地壳有一个地震探测窗口深度（300-390千米），其VP异常为4%。此外，上地壳还有两个窗口深度（250千米和610-660千米），与周围地幔相比，VP异常为-6.4%-1.6%，VS异常为-7.6%-2.2%，VP异常为3.6%-7.9%，VS异常为3.9%-8.6%。这些预测的SCC特征与地幔深度的地震异常相吻合，表明俯冲上地壳可能是造成MTZ高速异常的原因。

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来源期刊

ACS Applied Energy Materials Materials Science-Materials Chemistry

CiteScore

10.30

自引率

6.20%

发文量

1368

期刊介绍： ACS Applied Energy Materials is an interdisciplinary journal publishing original research covering all aspects of materials, engineering, chemistry, physics and biology relevant to energy conversion and storage. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrate knowledge in the areas of materials, engineering, physics, bioscience, and chemistry into important energy applications.