Subducted carbon weakens the forearc mantle wedge in a warm subduction zone
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View abstract on PubMed
Summary
This summary is machine-generated.Subducting carbon transforms mantle wedge minerals, creating talc and carbonate-rich zones in warm subduction zones. This mineral change may affect earthquake behavior and tremor activity.
Area Of Science
- Geochemistry
- Mineral Physics
- Tectonics
Background
- Subducting oceanic plates transport significant carbon into Earth's mantle.
- Carbon mobilization by fluids alters mantle wedge mineralogy and mechanical properties.
Purpose Of The Study
- Investigate down-dip mineral assemblage variations in the forearc mantle.
- Model interactions between carbon-bearing fluids and mantle rocks.
Main Methods
- Thermodynamic modeling of multi-component fluid-rock interactions.
- Analysis of mineral assemblage changes with depth in subduction zones.
Main Results
- Aqueous carbon-rich fluids are generated in warm subduction zones (e.g., Nankai).
- Mineral assemblage shifts from serpentine-rich to talc + carbonate-rich with increasing depth.
- This transition occurs due to aqueous carbon infiltration.
Conclusions
- Aqueous carbon infiltration influences forearc mantle mineralogy.
- The observed mineral transition may impact the seismogenic-aseismic boundary depth.
- This process could affect the down-dip extent of episodic tremor and slip.
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