The stability of subducted glaucophane with the Earth’s secular cooling

Yoonah Bang, Huijeong Hwang, Taehyun Kim, Hyunchae Cynn, Yong Park, Haemyeong Jung, Changyong Park, Dmitry Popov, Vitali B. Prakapenka, Lin Wang, Hanns-Peter Liermann, Tetsuo Irifune, Ho-Kwang Mao and Yongjae Lee ()
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Yoonah Bang: Yonsei University
Huijeong Hwang: Yonsei University
Taehyun Kim: Yonsei University
Hyunchae Cynn: Lawrence Livermore National Laboratory
Yong Park: Seoul National University
Haemyeong Jung: Seoul National University
Changyong Park: Argonne National Laboratory
Dmitry Popov: Argonne National Laboratory
Vitali B. Prakapenka: University of Chicago
Lin Wang: Center for High Pressure Science & Technology Advanced Research
Hanns-Peter Liermann: Photon Sciences, Deutsches Elektronen-Synchrotron (DESY)
Tetsuo Irifune: Geodynamics Research Center, Ehime University
Ho-Kwang Mao: Center for High Pressure Science & Technology Advanced Research
Yongjae Lee: Yonsei University

Nature Communications, 2021, vol. 12, issue 1, 1-7

Abstract: Abstract The blueschist to eclogite transition is one of the major geochemical–metamorphic processes typifying the subduction zone, which releases fluids triggering earthquakes and arc volcanism. Although glaucophane is an index hydrous mineral for the blueschist facies, its stability at mantle depths in diverse subduction regimes of contemporary and early Earth has not been experimentally determined. Here, we show that the maximum depth of glaucophane stability increases with decreasing thermal gradients of the subduction system. Along cold subduction geotherm, glaucophane remains stable down ca. 240 km depth, whereas it dehydrates and breaks down at as shallow as ca. 40 km depth under warm subduction geotherm or the Proterozoic tectonic setting. Our results imply that secular cooling of the Earth has extended the stability of glaucophane and consequently enabled the transportation of water into deeper interior of the Earth, suppressing arc magmatism, volcanism, and seismic activities along subduction zones.

Date: 2021
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DOI: 10.1038/s41467-021-21746-8

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