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Related Concept Videos

Temperature Dependent Deformation01:12

Temperature Dependent Deformation

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In a nonhomogeneous rod made up of steel and brass, restrained at both ends and subjected to a temperature change, several steps are involved in calculating the stress and compressive load. Due to the problem's static indeterminacy, one end support is disconnected, allowing the rod to experience the temperature change freely. Next, an unknown force is applied at the free end, triggering deformations in the rod's steel and brass portions. These deformations are then calculated and added...
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Hydration of cement is a chemical reaction between cement particles and water. This process occurs primarily through two mechanisms: through-solution and topochemical. In the through-solution process, anhydrous compounds dissolve into their constituents, hydrates form in the solution, and then precipitate from the supersaturated solution. The topochemical process involves solid-state reactions at the cement particle surface. The through-solution process dominates the topochemical process at the...
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Water and other polar molecules are attracted to ions. The electrostatic attraction between an ion and a molecule with a dipole is called an ion-dipole attraction. These attractions play an important role in the dissolution of ionic compounds in water.
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Calorimetry is a technique used to measure the amount of heat involved in a chemical or physical process or to measure the heat transferred to or from a substance. The heat is exchanged with a calibrated and insulated device called the calorimeter. Calorimetry experiments are based on the assumption that there is no heat exchange between the insulated calorimeter and the external environment. The well-insulated calorimeters prevent the transfer of heat between the calorimeter and its external...
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High-pressure, High-temperature Deformation Experiment Using the New Generation Griggs-type Apparatus
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Coupling antigorite deformation and dehydration in high-pressure experiments.

Lisa Eberhard1, Mattia Luca Mazzucchelli2, Stefan Markus Schmalholz2

  • 1Department of Earth Sciences, Utrecht University, Utrecht, The Netherlands.

Contributions to Mineralogy and Petrology. Beitrage Zur Mineralogie Und Petrologie
|August 27, 2025
PubMed
Summary
This summary is machine-generated.

Deformation, not temperature or composition, triggers antigorite dehydration in subduction zones. Strain concentration locally increases antigorite's internal energy, enabling fluid release and influencing geochemical and geophysical processes.

Keywords:
DeformationGriggs experimentHydro-mechanical-chemical HMC couplingMechanical work rateReaction kineticsSerpentine dehydration

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Area of Science:

  • Geochemistry
  • Geophysics
  • Mineral Physics

Background:

  • Antigorite dehydration is a key reaction in subduction zones, impacting geochemical and geophysical processes.
  • Understanding the drivers of antigorite dehydration is crucial for modeling subduction zone dynamics.

Purpose of the Study:

  • Investigate the onset of antigorite dehydration.
  • Identify chemical and physical parameters that drive fluid release from antigorite.
  • Determine the role of deformation in antigorite dehydration.

Main Methods:

  • Hydrostatic and co-axial Griggs experiments on antigorite serpentinites.
  • High-pressure and high-temperature experiments (1.5 GPa, 620–670 °C).
  • Analyses of run products and numerical simulations coupling reaction kinetics and mechanical work rate.

Main Results:

  • Antigorite dehydration was restricted to deformed samples.
  • Nano-sized olivine and orthopyroxene formed in oblique dehydration bands.
  • Deformation-related dehydration was supported by numerical simulations.
  • Strain concentration locally increases antigorite's internal energy, enabling dehydration.

Conclusions:

  • Deformation, rather than mineralogical or chemical heterogeneities or temperature gradients, is the primary driver for antigorite dehydration.
  • Coupled mechanical and chemical processes are essential for understanding antigorite dehydration.
  • This study provides a mechanistic framework for deformation-induced antigorite dehydration in subduction zones.