Startseite Naturwissenschaften Potential link between antigorite dehydration and shallow intermediate-depth earthquakes in hot subduction zones
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Potential link between antigorite dehydration and shallow intermediate-depth earthquakes in hot subduction zones

  • Tongbin Shao ORCID logo , Maoshuang Song ORCID logo , Xi Ma , Xing Ding , Shirong Liu , Yongsheng Zhou , Jie Wu , Xiaoning Wang und Jianfeng Li
Veröffentlicht/Copyright: 3. Januar 2023
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American Mineralogist
Aus der Zeitschrift American Mineralogist Band 108 Heft 1

Abstract

The distribution of earthquakes at intermediate depths corresponding to pressures <2 GPa in several hot subduction zones (such as Cascadia and southwestern Japan) coincides with the breakdown of antigorite to forsterite and talc; thus, this reaction may have triggered these earthquakes. However, previous studies have overlooked the potential significance of this reaction. Here, we performed a series of time-dependent dehydration experiments on antigorite at a pressure of 200 MPa and a temperature range of 500–650 °C. The results show that dehydration is controlled by a heterogeneous nucleation and growth mechanism and has an activation energy of 354 ± 24 kJ/mol. The formation of fine-grained forsterite and large talc crystals is consistent with kinetic results indicating Avrami exponents n = ~1.4–1.1 and ~2.7, respectively. Fluid production rates at 600 and 650 °C are 2.54 × 10−6 and 4.69 × 10−5 m fluid  3   m r o c k − 3   s − 1 respectively, which are much faster than those of mantle deformation, causing high fluid pressure in hot subducting mantle but not necessarily embrittlement. We emphasize the role of kinetic mechanisms in controlling the grain sizes of reaction products, which likely determine the mechanical behavior of serpentinized fault zones. Superplasticity or velocity weakening of fine-grained forsterite and velocity weakening of antigorite by water and/or talc may be responsible for earthquake nucleation and propagation in a heterogeneous system, which can be either dehydration products within a serpentinized fault zone or the mixture of antigorite fault and surrounding peridotite in hot subduction zones (<2 GPa).

Keywords: Antigorite; talc; forsterite; kinetic mechanism; subduction zone; shallow intermediate-depth earthquakes

Acknowledgments and Funding

We thank Tingting Shen for the helpful discussion and guidance during TEM measurement of the modulation structure of antigorite. We also appreciate the valuable comments and suggestions from the two anonymous reviewers and the Associate Editor, Sarah Brownlee, which helped us improve the manuscript. This work was supported by the Strategic Priority Research Program (B) of the Chinese Academy of Sciences (Grant Nos. XDB42020403 and XDB18000000), the National Natural Science Foundation of China (Grant Nos. 41702224 and 41874107), a research grant from the State Key Laboratory of Earthquake Dynamics (Grant No. LED2017B06), and the Pearl River Talent Plan of Guangdong Province. This is a contribution to No. IS-3122 from GIGCAS.

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Received: 2021-08-24
Accepted: 2022-01-19
Published Online: 2023-01-03
Published in Print: 2023-01-27

© 2023 Mineralogical Society of America

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https://doi.org/10.2138/am-2022-8271
Schlagwörter für diesen Artikel
Antigorite; talc; forsterite; kinetic mechanism; subduction zone; shallow intermediate-depth earthquakes

Artikel in diesem Heft

  1. MSA Review
  2. Nickel in olivine as an exploration indicator for magmatic Ni-Cu sulfide deposits: A data review and re-evaluation
  3. Repeat, fast, and high-resolution mapping of fine-scale trace element distribution in pyrite and marcasite by LA-Q-ICP-MS with the Aerosol Rapid Introduction System (ARIS)
  4. Continuous Be mineralization from two-mica granite to pegmatite: Critical element enrichment processes in a Himalayan leucogranite pluton
  5. An evolutionary system of mineralogy, Part VI: Earth’s earliest Hadean crust (>4370 Ma)
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  7. Fe3+/FeT ratios of amphiboles determined by high spatial resolution single-crystal synchrotron Mössbauer spectroscopy
  8. How clay delamination supports aseismic slip
  9. The influence of Al2O3 on the structural properties of MgSiO3 akimotoite
  10. Atomistic insight into the ferroelastic post-stishovite transition by high-pressure single-crystal X-ray diffraction
  11. Epidote as a conveyor of water into the Earth’s deep mantle in subduction zones: Insights from coupled high-pressure and high-temperature experiments
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  13. Stability of Fe5O6 and its relation to other Fe-Mg-oxides at high pressures and temperatures
  14. From schwertmannite to natrojarosite: Long-term stability and kinetic approach
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  16. Textural and chemical evolution of magnetite from the Paleozoic Shuanglong Fe-Cu deposit: Implications for tracing ore-forming fluids
  17. Jingwenite-(Y) from the Yushui Cu deposit, South China: The first occurrence of a V-HREE-bearing silicate mineral
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