579 research outputs found
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Phase Equilibria Modeling of Low-Grade Metamorphic Martian Rocks
We report on modeling low-grade (up to 300 ┬░C) metamorphic reactions with Martian starting materials
Lower dimensional Yang-Mills theory as a laboratory to study the infrared regime
Lattice studies of the infrared regime of gauge theories are complicated by
the required extensive limits, the performed gauge fixing and the demand for
high statistics. Using a general power counting scheme for the infrared limit
of Landau gauge SU(N) Yang-Mills theory in arbitrary dimensions we show that
the infrared behavior of Greens functions is both qualitatively and
quantitatively similar in two, three and four spacetime dimensions. Therefore,
lower dimensional lattice simulations can serve as a simplified laboratory to
analyze the presently applied approximations and to obtain first results for
higher correlation functions.Comment: 7 pages, 6 figures; talk presented at Lattice 200
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Magmatic Intrusions into the Sulfur-Rich Carmel Formation on the Colorado Plateau, USA: Implications for the Mars 2020 Mission
We report on basaltic dikes in the Colorado Plateau, which crosscut sulfate bearing sediments and compare this to Martian basalts and basaltic sediments in contact with sulfate mineralizations
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Simulating the Martian Chemical Enivronment
We report on new analogue materials to simulate Martian rocks and soils, especially under realistic redox conditions
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Evidence for impact-induced hydrothermal clay mineral formation at Endeavour crater, Mars.
Over 13 years after landing at Meridiani Planum and in her 10th extended mission, Mars Exploration Rover Opportunity continues to explore the rim of ~22 km diameter Endeavour crater. The rim exposes material that is older than the S-rich, layered sedimentary rock covering the Meridiani plains and filling much of the interior of Endeavour. Clay mineral exposures at the rim have been observed from orbit and confirmed on the ground. Clay minerals are thought to indicate wet, generally habitable environmental conditions more suitable to life than the S-rich, acidic waters responsible for the Meridiani sedimentary rocks. However, in order to assess the habitability of the past environment recorded by the Endeavour rim rocks it is important to understand how the clay minerals formed. Do they represent the conditions prior to impact; or do they result from impact-induced hydrothermal activity; or both? Here we present evidence that at least some of the observed clay mineral assemblages formed as a result of impact-induced hydrothermal alteration
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Rochechouart hydrothermal overprint: disentangling the timing of events through Ar-Ar dating
There is a growing interest in the thermal evolution and fluid behavior of impact structures in the context of their possible influence on emergence of life both in the Early Earth and on other Planetary Bodies. This is largely related to hydrothermal mechanisms at work during the cooling of the hot materials produced and deposited in impact craters. Yet most of the research in this field is focused on theoretical approaches and mathematical models. Ground truth data of terrestrial craters are limited, despite the fact that they are by far the most accessible reservoir for testing models. Even on Earth, few of the 185 impact sites are sufficiently well preserved to yield material that can constrain the key processes of temperature evolution and water availability. The Rochechouart impact crater in the Massif Central region of France exposes rocks that recorded the hydrothermal system. Target rocks immediately below the crater floor are widely exposed within the ~24 km Rochechouart impact structure overlaid by the complete sequence of crater fill deposits in an inner zone ~15 km
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Alteration and Oxidiation of an Olivine Lamprophyre Dike from Southern Utah, USA: An Analog for Mars
We report on oxidized basaltic dike intrusions on the Colorado Plateau as analog for Martian basalt oxidation
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The Physio-Chemical Properties for the Interior of Enceladus
We have reviewed the current physical and chemical conditions of the Enceladus sub-surface environment, including the composition, temperature, pH and pressure. Here we have defined some of these parameters and, through the aid of modelling, will define and refine the remaining parameters needed for our experimental work. Simulations of the chemical reactions occurring within Enceladus can then be carried
out to advance our understanding of the internal environment of Enceladus and help evaluate its potential habitability. Once a better understanding of the chemical reactions occurring at the rock-water interface has been carried out, then potential analogues on Earth can be evaluated and known microbial life can be tested to see if it could survive the conditions of Enceladus
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The Apollo Virtual Microscope Collection: Lunar Mineralogy and Petrology of Apollo 11, 12, 14, 15 and 16 Rocks
We report on the new Virtual Microscopes on Apollo 16 lunar samples in our Apollo Virtual Microscope collection
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