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Some solids can transition directly into the gaseous state, bypassing the liquid state, via a process known as sublimation. At room temperature and standard pressure, a piece of dry ice (solid CO2) sublimes, appearing to gradually disappear without ever forming any liquid. Snow and ice sublimate at temperatures below the melting point of water, a slow process that may be accelerated by winds and the reduced atmospheric pressures at high altitudes. When solid iodine is warmed, the solid sublimes...
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Peripheral thermosensation is the perception of external temperature. A change in temperature (on the surface of the skin and other tissues) is detected by a family of temperature-sensitive ion channels called Transient Receptor Potential, or TRP, receptors. These receptors are located on free nerve endings. Those detecting cold temperatures are closer to the surface of the skin than the nerve endings detecting warmth. These thermoTRP channels, while temperature selective, have relatively...
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Heating a crystalline solid increases the average energy of its atoms, molecules, or ions, and the solid gets hotter. At some point, the added energy becomes large enough to partially overcome the forces holding the molecules or ions of the solid in their fixed positions, and the solid begins the process of transitioning to the liquid state or melting. At this point, the temperature of the solid stops rising, despite the continual input of heat, and it remains constant until all of the solid is...
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Sublimation is the direct transformation of a solid to a gaseous state. For instance, at standard pressure and room temperature, solid carbon dioxide sublimes to gaseous carbon dioxide. The phase diagram depicts the conditions required for sublimation. This process occurs at the solid-gas phase boundary and is not observed above the triple point of the substance. The reverse of sublimation is called deposition, where a gaseous substance condenses directly into a solid. Sublimation and...
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When a substance—isolated from its environment—is subjected to heat changes, corresponding changes in temperature and phase of the substance is observed; this is graphically represented by heating and cooling curves.
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Hot versus cold subduction initiation.

Zhong-Hai Li1

  • 1Key Laboratory of Computational Geodynamics, College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, China.

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|January 30, 2024
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Summary
This summary is machine-generated.

New subduction zones initiate in two distinct ways, creating either hot or cold channels. These distinct incipient subduction channels result in contrasting geological records, offering insights into plate tectonics.

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Area of Science:

  • Geology
  • Tectonics
  • Earth Science

Background:

  • Subduction zones are critical features of plate tectonics.
  • The initiation phase of subduction is complex and not fully understood.
  • Different initiation mechanisms may lead to varied geological outcomes.

Purpose of the Study:

  • To explore the two primary modes of new subduction zone initiation.
  • To differentiate between hot and cold incipient subduction channels.
  • To understand the contrasting geological records produced by these distinct initiation pathways.

Main Methods:

  • Geological modeling
  • Analysis of seismic data
  • Comparison of field observations from active margins

Main Results:

  • Two distinct pathways for subduction initiation identified: hot and cold.
  • Hot channels are associated with specific magmatic and metamorphic signatures.
  • Cold channels exhibit different thermal and structural characteristics, leading to unique geological records.

Conclusions:

  • The initiation mechanism of a subduction zone significantly influences its early evolution.
  • Understanding these contrasting pathways is key to interpreting geological records of past subduction events.
  • This research provides a framework for distinguishing between hot and cold incipient subduction zones.