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Title: Mineralogy and density of Archean volcanic crust in the mantle transition zone

Abstract

The composition of Archean volcanic crust can be characterized by a higher Mg/Si ratio than modern mid-ocean ridge basalt (MORB), because of the higher degree melting from the warmer mantle in the Archean. Although modern MORB may become less dense than the surrounding mantle beneath the mantle transition zone (MTZ), the Mg-rich composition of Archean volcanic crust may result in the different density, and therefore different sinking behavior near the MTZ. In order to understand the compositional effect of Archean volcanic crust on the sinking behaviors and the scale of mantle mixing in the Archean, we investigated the mineralogy and density of Archean volcanic crust near the MTZ (470–910 km-depth). Here, we conducted experiments at 19–34 GPa and 1400–2400 K using the laser-heated diamond anvil cell (LHDAC) combined with in-situ X-ray diffraction (XRD). The in-situ XRD and the chemical analysis revealed that Archean volcanic crust forms garnet and ringwoodite (84 and 16 vol%, respectively), which gradually transforms to Brg and CaPv (82 and 18 vol%, respectively) at 23–25 GPa and 1800 K. Our in-situ XRD experiments allowed us to measure the volumes of stable phases and to estimate their densities at high pressure and temperature. The results suggest that Archeanmore » volcanic crust maintains greater density than the pyrolitic mantle in the Archean regardless of temperature at 20–34 GPa (570–850 km-depth), promoting further sinking into the deeper mantle in the Archean. We also considered the density of the subducting slab in the Archean. The density model showed that the subducting slab is still denser or at least equally dense as the surrounding pyrolitic mantle in the Archean.« less

Authors:
 [1];  [2];  [3];  [4];  [1];  [1]
  1. Arizona State Univ., Tempe, AZ (United States)
  2. Univ. of Chicago, IL (United States)
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  4. Univ. of Chicago, IL (United States); Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC); National Science Foundation (NSF); National Aeronautics and Space Administration (NASA)
OSTI Identifier:
1783126
Alternate Identifier(s):
OSTI ID: 1776163
Grant/Contract Number:  
AC02-05CH11231; AC02-06CH11357; FG02-97ER14466; EAR 10-43050; EAR-1634415; EAR-1606856; EAR-1725094; EAR-1135452; NNX15AD53G
Resource Type:
Accepted Manuscript
Journal Name:
Physics of the Earth and Planetary Interiors
Additional Journal Information:
Journal Volume: 305; Journal ID: ISSN 0031-9201
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; Archean volcanic crust; density; mineralogy; mantle transition zone; in-situ x-ray diffraction; high P-T experiments

Citation Formats

Ko, Byeongkwan, Prakapenka, Vitali, Kunz, Martin, Prescher, Clemens, Leinenweber, Kurt, and Shim, Sang-Heon. Mineralogy and density of Archean volcanic crust in the mantle transition zone. United States: N. p., 2020. Web. doi:10.1016/j.pepi.2020.106490.
Ko, Byeongkwan, Prakapenka, Vitali, Kunz, Martin, Prescher, Clemens, Leinenweber, Kurt, & Shim, Sang-Heon. Mineralogy and density of Archean volcanic crust in the mantle transition zone. United States. https://doi.org/10.1016/j.pepi.2020.106490
Ko, Byeongkwan, Prakapenka, Vitali, Kunz, Martin, Prescher, Clemens, Leinenweber, Kurt, and Shim, Sang-Heon. Mon . "Mineralogy and density of Archean volcanic crust in the mantle transition zone". United States. https://doi.org/10.1016/j.pepi.2020.106490. https://www.osti.gov/servlets/purl/1783126.
@article{osti_1783126,
title = {Mineralogy and density of Archean volcanic crust in the mantle transition zone},
author = {Ko, Byeongkwan and Prakapenka, Vitali and Kunz, Martin and Prescher, Clemens and Leinenweber, Kurt and Shim, Sang-Heon},
abstractNote = {The composition of Archean volcanic crust can be characterized by a higher Mg/Si ratio than modern mid-ocean ridge basalt (MORB), because of the higher degree melting from the warmer mantle in the Archean. Although modern MORB may become less dense than the surrounding mantle beneath the mantle transition zone (MTZ), the Mg-rich composition of Archean volcanic crust may result in the different density, and therefore different sinking behavior near the MTZ. In order to understand the compositional effect of Archean volcanic crust on the sinking behaviors and the scale of mantle mixing in the Archean, we investigated the mineralogy and density of Archean volcanic crust near the MTZ (470–910 km-depth). Here, we conducted experiments at 19–34 GPa and 1400–2400 K using the laser-heated diamond anvil cell (LHDAC) combined with in-situ X-ray diffraction (XRD). The in-situ XRD and the chemical analysis revealed that Archean volcanic crust forms garnet and ringwoodite (84 and 16 vol%, respectively), which gradually transforms to Brg and CaPv (82 and 18 vol%, respectively) at 23–25 GPa and 1800 K. Our in-situ XRD experiments allowed us to measure the volumes of stable phases and to estimate their densities at high pressure and temperature. The results suggest that Archean volcanic crust maintains greater density than the pyrolitic mantle in the Archean regardless of temperature at 20–34 GPa (570–850 km-depth), promoting further sinking into the deeper mantle in the Archean. We also considered the density of the subducting slab in the Archean. The density model showed that the subducting slab is still denser or at least equally dense as the surrounding pyrolitic mantle in the Archean.},
doi = {10.1016/j.pepi.2020.106490},
journal = {Physics of the Earth and Planetary Interiors},
number = ,
volume = 305,
place = {United States},
year = {Mon May 11 00:00:00 EDT 2020},
month = {Mon May 11 00:00:00 EDT 2020}
}

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