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Thermal Infrared Spectroscopy of Igneous Rocks at Simulated Mercury's Surface Environment

Ferrari, Sabrina and Maturilli, Alessandro and Carli, Cristian and Stojic, Aleksandra and D'Amore, Mario and Helbert, Jörn and Hiesinger, H. and Nestola, Fabrizio (2015) Thermal Infrared Spectroscopy of Igneous Rocks at Simulated Mercury's Surface Environment. In: Lunar and Planetary Science. LPSC 2015, March 16-20, 2015, The Woodlands, Texas, USA.

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Abstract

Recent findings by the MErcury Surface, Space ENvironment, GEochemistry, and Ranging (MESSENGER) spacecraft, corroborated by petrologic modeling, revealed the surface composition of Mercury as mainly constituted by low-Fe and Mgrich basalts [1, 2]. This interpretation dismisses the previously assumed widespread presence of more felsic materials - as on the Moon’s surface - leaving open the question of the crust petrogenesis of Mercury. Assessing the presence of a differentiated crust on the surface of Mercury is among the core objectives of the upcoming ESA/JAXA BepiColombo mission to Mercury [3]. The ESA Mercury Planetary Orbiter will carry the Mercury Radiometer and Thermal Imaging Spectrometer (MERTIS) covering the spectral range 7- 14 µm to map the surface mineralogy of the planet at 500 m spatial resolution. The interpretation of spectra collected along a wide range of daily surface temperatures is complicated by the shift of the location of the band minima depending on the temperature [4, 5]. In addition, the simultaneous presence of different minerals, each one with its own characteristic thermal expansion coefficient, results in a more difficult interpretation of the spectra. In this work we examine the thermal infrared (TIR) spectral variations of linear mixtures of plagioclase and pyroxenes that most likely could be present in the differentiated igneous crust of Mercury, in addition to the T-dependent spectral variations of the single constituents. Furthermore we show how two different thermal expansion coefficients combined in the same sample reveal in the resulting thermal infrared spectrum. To this aim we measure high-T emissivity - up to 450° C - of synthetic and natural compositions (e.g., anorthosite, gabbro, norite) and their components

Item URL in elib:https://elib.dlr.de/101703/
Document Type:Conference or Workshop Item (Poster)
Title:Thermal Infrared Spectroscopy of Igneous Rocks at Simulated Mercury's Surface Environment
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Ferrari, Sabrinasabrina.ferrari (at) dlr.deUNSPECIFIED
Maturilli, AlessandroAlessandro.Maturilli (at) dlr.deUNSPECIFIED
Carli, CristianIASF-INAF, Rome, ItalyUNSPECIFIED
Stojic, AleksandraWestfälische Wilhelms-Universität MünsterUNSPECIFIED
D'Amore, MarioMario.DAmore (at) dlr.dehttps://orcid.org/0000-0001-9325-6889
Helbert, JörnJoern.Helbert (at) dlr.dehttps://orcid.org/0000-0001-5346-9505
Hiesinger, H.Westfälische Wilhelms-Universität MünsterUNSPECIFIED
Nestola, Fabriziofabrizio.nestola (at) unipd.itUNSPECIFIED
Date:March 2015
Journal or Publication Title:Lunar and Planetary Science
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Mercury, Emissivity
Event Title:LPSC 2015
Event Location:The Woodlands, Texas, USA
Event Type:international Conference
Event Dates:March 16-20, 2015
Organizer:LPI
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Science and Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Erforschung des Weltraums
DLR - Research theme (Project):R - Vorhaben BepiColombo (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Experimentelle Planetenphysik
Deposited By: Maturilli, Alessandro
Deposited On:06 Jan 2016 13:59
Last Modified:31 Jul 2019 19:59

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