Special Issue "Martian Meteorites"
A special issue of Geosciences (ISSN 2076-3263).
Deadline for manuscript submissions: closed (21 August 2017)
Dr. Elias Chatzitheodoridis
Martian meteorites are a major source of information for understanding both primary and secondary geological and geochemical processes on the surface and subsurface of Mars. The planet is being investigated from an increasing number of orbiters and mobile landers with the primary goal to discover habitable environments, and ultimately extinct or extant forms of life. This requires the detailed study of both the surface and subsurface of the planet.
The International Society for Meteoritics and Planetary Science, in their Meteoritical Bulletin Database, currently lists 180 meteorites that are identified as Martian. If all of them truly originated from Mars, they already comprise a very extensive inventory of Martian samples. It is important to investigate the origin of these samples, the range of environments they cover, and their precise chronology. Their systematic and careful study should also be combined with in situ studies of the Martian surface. Martian meteorites will also be of paramount importance in aiding the selection of promising landing sites, troubleshooting current measurements on the surface of Mars, calibrating future Mars scientific payloads, and preparing future sample return missions.
State-of-the-art analytical instrumentation and advanced analytical methods and protocols are tested on Martian meteorites on Earth, enabling their study in an unprecedented detail. This is not yet possible with the instruments on-board the current Mars rovers. Mineralogical, geochemical, and textural observations clearly demonstrate secondary hydrous alteration on the planet, forming niche environments that could provide habitable sites in the sub-surface. Further research on Martian meteorites, such as the association of primary mineralogy with specific magmatic processes, the inventory of secondary minerals (i.e., clays, serpentine, carbonates, sulphates, halite), their relationship with Mars' hydrosphere and atmosphere, and their chronology will add to an already extensive database that will further unravel Mars' tantalizing history and its habitability.
Dr. Elias Chatzitheodoridis
Manuscript Submission Information
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- Planet Mars
- Martian meteorites
- Secondary minerals and processes
- Textural, chemical, mineralogical Biosignatures
The below list represents only planned manuscripts. Some of these manuscripts have not been received by the Editorial Office yet. Papers submitted to MDPI journals are subject to peer-review.
Title: Oxygen Isotope Thermometry of DaG 476 and SaU 008 Martian Meteorites: Implications for Their Origin
Authors: Arshad Ali 1, 2,* , Iffat Jabeen 2 and Sobhi J. Nasir 1
Affiliation: 1 Earth Sciences Research Centre (ESRC), Sultan Qaboos University (SQU), Al-Khodh, Muscat 123, Sultanate of Oman;
2 Department of Earth Sciences, Western University, 1151 Richmond Street N., London, ON, N6A 5B7 Canada
Abstract: We report the equilibration temperatures derived from the oxygen isotope thermometry of pyroxene-olivine pair from the DaG 476 (1220°C) and SaU 008 (1450°C) meteorites. Contrary to their geochemical and isotopic similarities, a temperature difference of 230°C between the two olivine-phyric shergottites provides insights into the Martian mantle magmatism. Based on our temperature estimation and previous magmatic models, we propose that SaU 008 could have originated from a deeper depleted mantle source. However, DaG 476 may have produced by the partial melting of the entrained pockets of the depleted mantle similar to that of the SaU 008’s source at relatively shallower depth. Both meteorites erupted as a relatively thick lava flow or a shallow intrusion at approximately the same time followed by a launch initiated by a single meteoritic impact at 1.1 Ma ago.
Keywords: Oxygen Isotopes, Thermometry, Martian Magmatism, DaG 476, SaU 008
Title: Reliability and validity of shergottite apatite / merrillite relationship in evaluating a water content in the Martian mantle
Authors: Słaby Ewa1,*, Giera Alicja1, Förster Hans-Jürgen2, Wirth Richard2, Rhede Dieter2, Birski Łukasz1, Moszumańska Izabela1, Schreiber Anja2
Affiliation: 1 Institute of Geological Sciences, Polish Academy of Sciences, Research Centre in Warsaw, Twarda 51/55, 00-818 Warsaw, Poland;
2 Helmholtz-Zentrum Potsdam Deutsches GeoForschungsZentrum GFZ, Telegrafenberg, 14473 Potsdam, Germany
Abstract: Apatite from shergottite is considered as a reliable and valid source of information about water content in Martian mantle. Phosphates from Martian shergottite NWA 2975 were used to get insight into magmas sources and their late differentiation. The crystallization process of two generations of fluorapatite and chlorapatite accompanied by ferromerrilite−merrillite was reconstructed from TEM (Transmission Electron Microscopy) and geochemical analyses. The research results indicated that the recognized volatiles budget of two generations of fluorapatite was highly related to its magmatic origin. Apatite crystals were formed from evolved magma, during its final differentiation and degassing stage. The proportions of halogen and water in the apatite indicated a high-temperature parental magma with high F activity and low Cl and water activities (F>>Cl~H2O). In turn chlorapatite replaces ferromerrillite-merrillite and can’t be correlated with primordial, mantle derived shergottite magma even if chlorapatite is frequently met in extraterrestrial basalts. The relationship between merrillite and apatite indicates that apatite is most probably a rproduct of merrillite reaction with solutions. So only fluorapatite is a reliable source of assessment of the degree of hydration of the mantle for NWA 2975. Consequently, the automatic use of apatite to assess the water content of magma source can lead to complete false assumptions if the origin of the apatite is not precisely.
Title: The hydrated silicate assemblages in the nakhlites
Author: Hitesh Changela
Abstract: This article summarises the state of knowledge on aqueous alteration in the nakhlites. The nakhlites are a unique sample-set of Mars; they are the only subgroup of martian meteorites sampling a depth profile on Mars that have been altered by aqueous fluids. The nakhlites are clinopyroxenites. The nakhlite pile currently consists of around a dozen meteorites. Secondary mineralogy in these martian surface samples mostly occurs in the form of hydrated silicate within olivine grains and/or nakhlite mesostases.
Previous insights into the nakhlite hydrated silicate assemblages convey evidence for a range of processes leading to their formation. These studies have provided a forensic account of the secondary assemblages. However, they outline contrasting formation mechanisms. A precise history of the interactions between the nakhlite lithology and aqueous fluids on Mars therefore remains enigmatic. Formation mechanisms of the nakhlite hydrated silicate assemblages range from the deposition of external siliceous fluid in olivine fractures, the dissolution of olivine and the subsequent precipitation of hydrated silicate to the isovolumentric direct replacement of olivine by hydrated silicate(s). Further microanalytical tests are required in order to constrain the precise for the aqueous history on the nakhlite parent body.
Constraints on the formation history could be made via the following tests: 1. correlative measurements between the morphological, structural, chemical and isotopic properties of the hydrated silicate zones in the host primary igneous minerals they occur in – mainly olivine phenocrysts.