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Mineralogy, chemistry and biological contingents of an early-middle Miocene Antarctic paleosol and its relevance as a Martian analogue

Mahaney, William C.; Dohm, James M.; Schwartz, Stephane; Findling, Nathaniel; Hart, Kris M.; Conway, Susan J.; Allen, Christopher C.R.; Miyamoto, Hideaki and Fairén, Alberto G. (2014). Mineralogy, chemistry and biological contingents of an early-middle Miocene Antarctic paleosol and its relevance as a Martian analogue. Planetary And Space Science, 104(Part B) pp. 253–269.

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Fossil mesofauna and bacteria recovered from a paleosol in a moraine situated adjacent to the inland ice, Antarctica, and dating to the earliest glacial event in the Antarctic Dry Valleys opens several questions. The most important relates to understanding of the mineralogy and chemistry of the weathered substrate habitat in which Coleoptera apparently thrived at some point in the Early/Middle Miocene and perhaps earlier. Here, Coleoptera remains are only located in one of six horizons in a paleosol formed in moraine deposited during the alpine glacial event (>15 Ma). A tendency for quartz to decrease upward in the section may be a detrital effect or a product of dissolution in the early stage of profile morphogenesis when climate was presumably milder and the depositing glacier of temperate type. Discontinuous distributions of smectite, laumontite, and hexahydrite may have provided nutrients and water to mesofauna and bacteria during the early stage of biotic colonization of the profile. Because the mesofauna were members of burrowing Coleoptera species, future work should assess the degree to which the organisms occupied other sites in the Dry Valleys in the past. Whereas there is no reasonable expectations of finding Coleoptera/insect remains on Mars, the chemistry and mineralogy of the paleosol is within a life expectancy window for the presence of microorganisms, principally bacteria and fungi. Thus, parameters discussed here within this Antarctic paleosol could provide an analogue to identifying similar fossil or life-bearing weathered regolith on Mars.

Item Type: Journal Item
Copyright Holders: 2014 Elsevier Ltd.
ISSN: 0032-0633
Project Funding Details:
Funded Project NameProject IDFunding Body
Wet, moist, or dry? Using digital terrain models to determine the amount of water that has shaped the surfaces of Earth, Mars and the Moon. (SE-10-183-MB)RPG-397The Leverhulme Trust
Keywords: Antarctic paleosols; Miocene bacteria and mesofauna; paleoclimate; alpine glaciation in Antarctica; Mars; Thaumasia highlands; Coprates rise; mountain ranges; habitability; periglacial and glacial environments of Mars
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Item ID: 44425
Depositing User: Susan Conway
Date Deposited: 25 Sep 2015 08:42
Last Modified: 01 Jul 2019 18:55
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