1. Hidden intact coesite in deeply subducted rocks
- Author
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Yui Kouketsu, Yohei Igami, Akira Miyake, Tomoyuki Kobayashi, and Tomoki Taguchi
- Subjects
Geological process ,010504 meteorology & atmospheric sciences ,Subduction ,Geochemistry ,Numerical modeling ,Metamorphism ,Geodynamics ,engineering.material ,010502 geochemistry & geophysics ,01 natural sciences ,Geophysics ,Space and Planetary Science ,Geochemistry and Petrology ,Coesite ,Earth and Planetary Sciences (miscellaneous) ,engineering ,Pseudomorph ,Geology ,0105 earth and related environmental sciences - Abstract
The stabilization of coesite is a diagnostic indicator of ultrahigh-pressure metamorphism and in many cases it implies that a rock has been subducted to a minimum depth of 80 km. Coesite typically occurs as rare relicts in rigid host minerals, but most commonly transforms into α-quartz pseudomorphs during exhumation. The abundance of coesite-bearing rocks in orogens worldwide is a contentious issue in the petrological community, despite evidence from numerical modeling that suggests that coesite formation should be a common geological process during ultrahigh-pressure metamorphism. This knowledge gap must be addressed to improve the understanding of the geological aspects of subduction-zone geodynamics. Here we report that minuscule coesites (
- Published
- 2021
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