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Title: The Syrtis Major volcano, Mars: A multidisciplinary approach to interpreting its magmatic evolution and structural development: EVOLUTION OF THE SYRTIS MAJOR VOLCANO

Abstract

Very weak crustal magnetic fields over the Syrtis Major volcanic complex imply almost total thermal demagnetization via magmatic intrusions over a large area less than ~4Ga. We fit a model of these intrusions and the resulting thermal demagnetization to maps of crustal magnetic field strength at 185km altitude. The best fits are most consistent with a "dog bone"-shaped region of intrusive material, elongated approximately north-south, with an area of ~350,000km 2 and an inferred volume of ~4-19×10 6km 3. Such a large volume is best explained by a long-lived mantle plume beneath the Syrtis edifice. A free-air gravity anomaly high over the Syrtis Major caldera is consistent with dense mafic residue remaining at depth following crystal fractionation that produced the silicic magmas seen at the surface. The elongation of this region is consistent with ascent and north-south emplacement of magma enabled by structures parallel to and associated with the preexisting Isidis impact basin.

Authors:
 [1];  [2];  [3];  [1];  [1];  [4];  [5]
  1. Univ. of California, Berkeley, CA (United States)
  2. Georgia Inst. of Technology, Atlanta, GA (United States)
  3. Lunar and Planetary Inst., Houston TX (United States)
  4. Univ. of South Florida, Tampa, FL (United States)
  5. NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1512130
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Geophysical Research. Planets
Additional Journal Information:
Journal Volume: 120; Journal Issue: 9; Journal ID: ISSN 2169-9097
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES

Citation Formats

Lillis, Robert J., Dufek, Josef, Kiefer, Walter S., Black, Benjamin A., Manga, Michael, Richardson, Jacob A., and Bleacher, Jacob E. The Syrtis Major volcano, Mars: A multidisciplinary approach to interpreting its magmatic evolution and structural development: EVOLUTION OF THE SYRTIS MAJOR VOLCANO. United States: N. p., 2015. Web. doi:10.1002/2014JE004774.
Lillis, Robert J., Dufek, Josef, Kiefer, Walter S., Black, Benjamin A., Manga, Michael, Richardson, Jacob A., & Bleacher, Jacob E. The Syrtis Major volcano, Mars: A multidisciplinary approach to interpreting its magmatic evolution and structural development: EVOLUTION OF THE SYRTIS MAJOR VOLCANO. United States. doi:10.1002/2014JE004774.
Lillis, Robert J., Dufek, Josef, Kiefer, Walter S., Black, Benjamin A., Manga, Michael, Richardson, Jacob A., and Bleacher, Jacob E. Fri . "The Syrtis Major volcano, Mars: A multidisciplinary approach to interpreting its magmatic evolution and structural development: EVOLUTION OF THE SYRTIS MAJOR VOLCANO". United States. doi:10.1002/2014JE004774. https://www.osti.gov/servlets/purl/1512130.
@article{osti_1512130,
title = {The Syrtis Major volcano, Mars: A multidisciplinary approach to interpreting its magmatic evolution and structural development: EVOLUTION OF THE SYRTIS MAJOR VOLCANO},
author = {Lillis, Robert J. and Dufek, Josef and Kiefer, Walter S. and Black, Benjamin A. and Manga, Michael and Richardson, Jacob A. and Bleacher, Jacob E.},
abstractNote = {Very weak crustal magnetic fields over the Syrtis Major volcanic complex imply almost total thermal demagnetization via magmatic intrusions over a large area less than ~4Ga. We fit a model of these intrusions and the resulting thermal demagnetization to maps of crustal magnetic field strength at 185km altitude. The best fits are most consistent with a "dog bone"-shaped region of intrusive material, elongated approximately north-south, with an area of ~350,000km2 and an inferred volume of ~4-19×106km3. Such a large volume is best explained by a long-lived mantle plume beneath the Syrtis edifice. A free-air gravity anomaly high over the Syrtis Major caldera is consistent with dense mafic residue remaining at depth following crystal fractionation that produced the silicic magmas seen at the surface. The elongation of this region is consistent with ascent and north-south emplacement of magma enabled by structures parallel to and associated with the preexisting Isidis impact basin.},
doi = {10.1002/2014JE004774},
journal = {Journal of Geophysical Research. Planets},
number = 9,
volume = 120,
place = {United States},
year = {2015},
month = {7}
}

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