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Title: Quantifying melt production and degassing rate at mid-ocean ridges from global mantle convection models with plate motion history

Abstract

The Earth's surface volcanism exerts first-order controls on the composition of the atmosphere and the climate. On Earth, the majority of surface volcanism occurs at mid-ocean ridges. In this study, based on the dependence of melt fraction on temperature, pressure, and composition, we compute melt production and degassing rate at mid-ocean ridges from three-dimensional global mantle convection models with plate motion history as the surface velocity boundary condition. By incorporating melting in global mantle convection models, we connect deep mantle convection to surface volcanism, with deep and shallow mantle processes internally consistent. We compare two methods to compute melt production: a tracer method and an Eulerian method. Our results show that melt production at mid-ocean ridges is mainly controlled by surface plate motion history, and that changes in plate tectonic motion, including plate reorganizations, may lead to significant deviation of melt production from the expected scaling with seafloor production rate. We also find a good correlation between melt production and degassing rate beneath mid-ocean ridges. The calculated global melt production and CO2 degassing rate at mid-ocean ridges varies by as much as a factor of 3 over the past 200 Myr. We show that mid-ocean ridge melt production and degassingmore » rate would be much larger in the Cretaceous, and reached maximum values at ~150–120 Ma. Our results raise the possibility that warmer climate in the Cretaceous could be due in part to high magmatic productivity and correspondingly high outgassing rates at mid-ocean ridges during that time.« less

Authors:
 [1];  [2];  [1];  [3];  [4];  [5]
  1. Univ. of Colorado, Boulder, CO (United States)
  2. City Univ. (CUNY), NY (United States); Univ. of California, Berkeley, CA (United States)
  3. Univ. of California, Berkeley, CA (United States)
  4. Portland State Univ., Portland, OR (United States)
  5. Johns Hopkins Univ., Baltimore, MD (United States)
Publication Date:
Research Org.:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1480728
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Geochemistry, Geophysics, Geosystems
Additional Journal Information:
Journal Volume: 17; Journal Issue: 7; Journal ID: ISSN 1525-2027
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; melt production; degassing rate; mid-ocean ridges

Citation Formats

Li, Mingming, Black, Benjamin, Zhong, Shijie, Manga, Michael, Rudolph, Maxwell L., and Olson, Peter. Quantifying melt production and degassing rate at mid-ocean ridges from global mantle convection models with plate motion history. United States: N. p., 2016. Web. doi:10.1002/2016GC006439.
Li, Mingming, Black, Benjamin, Zhong, Shijie, Manga, Michael, Rudolph, Maxwell L., & Olson, Peter. Quantifying melt production and degassing rate at mid-ocean ridges from global mantle convection models with plate motion history. United States. https://doi.org/10.1002/2016GC006439
Li, Mingming, Black, Benjamin, Zhong, Shijie, Manga, Michael, Rudolph, Maxwell L., and Olson, Peter. Sun . "Quantifying melt production and degassing rate at mid-ocean ridges from global mantle convection models with plate motion history". United States. https://doi.org/10.1002/2016GC006439. https://www.osti.gov/servlets/purl/1480728.
@article{osti_1480728,
title = {Quantifying melt production and degassing rate at mid-ocean ridges from global mantle convection models with plate motion history},
author = {Li, Mingming and Black, Benjamin and Zhong, Shijie and Manga, Michael and Rudolph, Maxwell L. and Olson, Peter},
abstractNote = {The Earth's surface volcanism exerts first-order controls on the composition of the atmosphere and the climate. On Earth, the majority of surface volcanism occurs at mid-ocean ridges. In this study, based on the dependence of melt fraction on temperature, pressure, and composition, we compute melt production and degassing rate at mid-ocean ridges from three-dimensional global mantle convection models with plate motion history as the surface velocity boundary condition. By incorporating melting in global mantle convection models, we connect deep mantle convection to surface volcanism, with deep and shallow mantle processes internally consistent. We compare two methods to compute melt production: a tracer method and an Eulerian method. Our results show that melt production at mid-ocean ridges is mainly controlled by surface plate motion history, and that changes in plate tectonic motion, including plate reorganizations, may lead to significant deviation of melt production from the expected scaling with seafloor production rate. We also find a good correlation between melt production and degassing rate beneath mid-ocean ridges. The calculated global melt production and CO2 degassing rate at mid-ocean ridges varies by as much as a factor of 3 over the past 200 Myr. We show that mid-ocean ridge melt production and degassing rate would be much larger in the Cretaceous, and reached maximum values at ~150–120 Ma. Our results raise the possibility that warmer climate in the Cretaceous could be due in part to high magmatic productivity and correspondingly high outgassing rates at mid-ocean ridges during that time.},
doi = {10.1002/2016GC006439},
journal = {Geochemistry, Geophysics, Geosystems},
number = 7,
volume = 17,
place = {United States},
year = {Sun Jul 31 00:00:00 EDT 2016},
month = {Sun Jul 31 00:00:00 EDT 2016}
}

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Free Publicly Available Full Text
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Cited by: 18 works
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Figures / Tables:

Table 1. Table 1.: Physical and Model Parameters

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