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Characterizing the Aqueous Geochemical History at Tyrrhena Terra, Mars

Bishop, J.L. and Grant, F.H. and Viviano, C. and Loizeau, Damien and Lane, M.D. and Voigt, Joana R.C. and Tirsch, Daniela and Tornabene, Livio L. and Jaumann, Ralf (2020) Characterizing the Aqueous Geochemical History at Tyrrhena Terra, Mars. AGU Fall Meeting 2020, 1.-17. Dez. 2020, virtual conference.

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Tyrrhena Terra is an intriguing region of Mars extending from the southern part of Isidis Basin at the Libya Montes southward to Hellas Basin. Noachian and Hesperian basement rocks are covered by Syrtis lavas, especially in the northwestern part of Tyrrhena Terra and the surface is carved by craters and fluvial features. The central region is marked by the craters Jarry-Desloges, Owen, and Briault, and contains abundant Fe/Mg-rich phyllosilicates and olivine-bearing outcrops in Noachian-Hesperian terrain [1,2]. Many of the phyllosilicates in this region are located in crater ejecta and in central crater mounds, consistent with uplift of ancient materials, but some are present in dissected terrains. We are investigating the mineralogy and geology of this region through a coordinated study using TES, THEMIS, CRISM multispectral strips, CTX and HRSC imagery, and HRSC digital elevation models at a regional scale, as well as CRISM targeted images and HiRISE views of the surface at a closer scale. The phyllosilicate spectra across the central Tyrrhena Terra region (see attached figure) are most consistent with chlorite, Fe/Mg-smectite, and mixed smectite-chlorite. A few hydrated silica and zeolite outcrops are also present. This mineralogy is consistent with higher temperature processes than the primarily Fe/Mg-smectite and carbonate spectra observed in the Libya Montes region [3,4]. A few sites towards the east of our study site contain more Fe/Mg-smectite than chlorite and additional hydrated phases including sulfates, which likely represent a different formation environment. Ongoing investigations of the targeted CRISM images at the eastern part of this area are characterizing the stratigraphy of these aqueous units and their association with higher temperature units towards the west and smectite-carbonate units towards the north.

Item URL in elib:https://elib.dlr.de/138177/
Document Type:Conference or Workshop Item (Poster)
Title:Characterizing the Aqueous Geochemical History at Tyrrhena Terra, Mars
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Bishop, J.L.Carl Sagan Center, SETI Institute and NASA-Ames Research Center, Mountain View, CAUNSPECIFIED
Grant, F.H.University of California Los Angeles (UCLA)UNSPECIFIED
Viviano, C.Johns Hopkins University Applied Physics Lab (JHUAPL)UNSPECIFIED
Loizeau, DamienInstitut d’Astrophysique Spatiale, Universite Paris-Sud, Orsay, FranceUNSPECIFIED
Lane, M.D.Fibernetics LLCUNSPECIFIED
Voigt, Joana R.C.Lunar and Planetary Laboratory, University of Arizona, AZ, USAUNSPECIFIED
Tirsch, DanielaDaniela.Tirsch (at) dlr.dehttps://orcid.org/0000-0001-5905-5426
Tornabene, Livio L.University of Western Ontario, London, ON, CanadaUNSPECIFIED
Jaumann, RalfFreie Universität Berlinhttps://orcid.org/0000-0002-9759-6597
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
Page Range:P079-008
Keywords:Mars, geologic mapping, spectroscopy, mineralogy, alteration, climate
Event Title:AGU Fall Meeting 2020
Event Location:virtual conference
Event Type:international Conference
Event Dates:1.-17. Dez. 2020
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 - Project Mars Express HRSC
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Planetary Geology
Deposited By: Tirsch, Daniela
Deposited On:25 Nov 2020 10:21
Last Modified:25 Nov 2020 10:21

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