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Global inventory and characterization of pyroclastic deposits on Mercury: New insights into pyroclastic activity from MESSENGER orbital data

Goudge, T.A. and Head, J.W. and Kerber, L. and Blewett, D.T. and Denevi, B.W. and Domingue, D.L. and Gillis-Davis, J. J. and Gwinner, K. and Helbert, Jörn and Holsclaw, G.M. and Izenberg, N.R. and Klima, R.L. and McClintock, W.E. and Murchie, S. L. and Neumann, G.A. and Smith, D.E. and Strom, R.G. and Xiao, Z. and Zuber, M.T. and Solomon, S. C. (2014) Global inventory and characterization of pyroclastic deposits on Mercury: New insights into pyroclastic activity from MESSENGER orbital data. Journal of Geophysical Research: Planets, 119 (3), pp. 635-658. Wiley. doi: 10.1002/2013JE004480. ISSN 2169-9097.

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Abstract

We present new observations of pyroclastic deposits on the surface of Mercury from data acquired during the orbital phase of the MErcury Surface, Space ENvironment, GEochemistry, and Ranging (MESSENGER) mission. The global analysis of pyroclastic deposits brings the total number of such identified features from 40 to 51. Some 90% of pyroclastic deposits are found within impact craters. The locations of most pyroclastic deposits appear to be unrelated to regional smooth plains deposits, except some deposits cluster around the margins of smooth plains, similar to the relation between many lunar pyroclastic deposits and lunar maria. A survey of the degradation state of the impact craters that host pyroclastic deposits suggests that pyroclastic activity occurred on Mercury over a prolonged interval. Measurements of surface reflectance by MESSENGER indicate that the pyroclastic deposits are spectrally distinct from their surrounding terrain, with higher reflectance values, redder (i.e., steeper) spectral slopes, and a downturn at wavelengths shorter than similar to 400nm (i.e., in the near-ultraviolet region of the spectrum). Three possible causes for these distinctive characteristics include differences in transition metal content, physical properties (e.g., grain size), or degree of space weathering from average surface material on Mercury. The strength of the near-ultraviolet downturn varies among spectra of pyroclastic deposits and is correlated with reflectance at visible wavelengths. We suggest that this interdeposit variability in reflectance spectra is the result of either variable amounts of mixing of the pyroclastic deposits with underlying material or inherent differences in chemical and physical properties among pyroclastic deposits.

Item URL in elib:https://elib.dlr.de/94252/
Document Type:Article
Title:Global inventory and characterization of pyroclastic deposits on Mercury: New insights into pyroclastic activity from MESSENGER orbital data
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Goudge, T.A.Department of Geological Sciences, Brown University, Providence, RI 02912, USA.UNSPECIFIEDUNSPECIFIED
Head, J.W.Department of Geological Sciences, Brown University, Providence, RI, USAUNSPECIFIEDUNSPECIFIED
Kerber, L.Labroratoire de Météorologie Dynamique du CNRS, Université Paris 6, Paris, Francel Park and Preserve, 11500 Hwy 150, Mosca, CO 81145, USAUNSPECIFIEDUNSPECIFIED
Blewett, D.T.Johns Hopkins University Applied Physics Laboratory, Laurel, MD, USAUNSPECIFIEDUNSPECIFIED
Denevi, B.W.Johns Hopkins Universitiy Applied Physics Laboratory, Laurel, MD 20723 United StatesUNSPECIFIEDUNSPECIFIED
Domingue, D.L.Planetary Science Institute, Tucson, AZ 85719, USAUNSPECIFIEDUNSPECIFIED
Gillis-Davis, J. J.University of Hawaii, Honolulu, HI, USAUNSPECIFIEDUNSPECIFIED
Gwinner, K.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Helbert, JörnUNSPECIFIEDhttps://orcid.org/0000-0001-5346-9505UNSPECIFIED
Holsclaw, G.M.Laboratory for Atmospheric and Space Physics, Boulder, CO, USAUNSPECIFIEDUNSPECIFIED
Izenberg, N.R.Johns Hopkins University Applied Physics Laboratory, Laurel, MD, USAUNSPECIFIEDUNSPECIFIED
Klima, R.L.Johns Hopkins University Applied Physics Laboratory, Laurel, MD 20723UNSPECIFIEDUNSPECIFIED
McClintock, W.E.Laboratory for Atmospheric and Space Physics, Boulder, CO, USAUNSPECIFIEDUNSPECIFIED
Murchie, S. L.Johns Hopkins University Applied Physics Laboratory, Laurel, Maryland, USAUNSPECIFIEDUNSPECIFIED
Neumann, G.A.NASA Goddard Space Flight Center, Greenbelt, MD 20771UNSPECIFIEDUNSPECIFIED
Smith, D.E.Massachusetts Institute of Technology, Cambridge, MA 02129UNSPECIFIEDUNSPECIFIED
Strom, R.G.Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ 85721, USAUNSPECIFIEDUNSPECIFIED
Xiao, Z.Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ 85721, USAUNSPECIFIEDUNSPECIFIED
Zuber, M.T.Department of Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139-4307, USAUNSPECIFIEDUNSPECIFIED
Solomon, S. C.Department of Terrestrial Magnetism, Carnegie Institution of Washington, Washington, DC 20015, USAUNSPECIFIEDUNSPECIFIED
Date:March 2014
Journal or Publication Title:Journal of Geophysical Research: Planets
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:119
DOI:10.1002/2013JE004480
Page Range:pp. 635-658
Publisher:Wiley
ISSN:2169-9097
Status:Published
Keywords:Pyroclastic Deposits, Volcanism, Mercury
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Space Exploration
DLR - Research theme (Project):R - Vorhaben BepiColombo (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research
Deposited By: Scholten, Dipl.-Ing. Frank
Deposited On:07 Jan 2015 10:46
Last Modified:28 Feb 2023 14:56

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