Silicon stable isotope fractionation between metal and silicate at high-pressure, high-temperature conditions as a tracer of planetary core formation

1,2J. Kempl, 1P.Z. Vroon, 1B. van der Wagt, 3E. Zinngrebe, 4D.J. Frost, 1W. van Westrenen
Netherlands Journal of Geosciences 95, 113-129  Link to Article [DOI: http://dx.doi.org/10.1017/njg.2015.34]
1Faculty of Earth and Life Sciences, Vrije Universiteit University Amsterdam, De Boelelaan 1085, 1081HV Amsterdam, the Netherlands
2Faculty of Civil Engineering and Geosciences, Delft University of Technology, Stevinweg 1, 2628CN Delft, the Netherlands
3Ceramics Research Center, Tata Steel IJmuiden, Building Code 3J-22, P.O. Box 1000, 1970 CA IJmuiden, the Netherlands
4Bayerisches Geoinstitut, University of Bayreuth, D-95440 Bayreuth, Germany

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Ab Initio Study of Electronic States of Astrophysically Important Molecules

1,2,3Valiev, R.R., 4Berezhnoy, A.A., 1,5Minaev, B.F., 6Chernov, V.E., 1Cherepanov, V.N.
Russian Physics Journal, Augus1 2016, 1-8 Link to Article [DOI: 10.1007/s11182-016-0803-y]
1National Research Tomsk State University, Tomsk, Russian Federation
2National Research Tomsk Polytechnic University, Tomsk, Federation
3V. D. Kuznetsov Siberian Physical-Technical Institute at Tomsk State University, Tomsk, Russian Federation
4P. K. Sternberg Astronomical Institute at Moscow State University, Moscow, Russian Federation
5Bogdan Khmel’nitskii National University, Cherkassy, Ukraine
6Voronezh State University, Voronezh, Russian Federation

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Rapid, direct and non-destructive assessment of fossil organic matter via microRaman spectroscopy

1Nicola Ferralis,2Emily D. Matys,3Andrew H. Knoll,2Christian Hallmann,2Roger E. Summons
Carbon 108, 440-449 Link to Article [http://dx.doi.org/10.1016/j.carbon.2016.07.039]
1Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
2Department of Earth Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
3Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, MA 02138, USA

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The effect of titanium on the partitioning behavior of high-field strength elements between silicates, oxides and lunar basaltic melts with applications to the origin of mare basalts

1Leitzke, F.P., 1Fonseca, R.O.C., 1Michely, L.T., 2Sprung, P., 2Münker, C., 1,3Heuser, A., 1Blanchard, H.
Chemical Geology 440, 219-238 Link to Article [10.1016/j.chemgeo.2016.07.011]
1Steinmann-Institut für Geologie, Mineralogie un Paläontologie, Rheinische Friedrich-Wilhelms-Universität Bonn, Bonn, Germany
2Institut für Geologie und Mineralogie, Universität zu Köln, Köln, Germany
3GEOMAR Helmholtz-Zentrum für Ozeanforschung Kiel, Wischhofstraße 1-3, Kielz, Germany

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A model for meteoritic and lunar 40Ar/39Ar age spectra: Addressing the conundrum of multi-activation energies

1P. Boehnke, 1T. Mark Harrison, 2M.T. Heizler, 1P.H. Warren
Earth and Planetary Science Letters (in Press) Link to Article [http://dx.doi.org/10.1016/j.epsl.2016.07.014]
1Department of Earth, Planetary and Space Sciences, University of California, Los Angeles, CA 90095, United States
1New Mexico Bureau of Geology and Mineral Resources, Socorro, NM 87801, United States
Copyright Elsevier

Results of whole-rock 40Ar/39Ar step-heating analyses of extra-terrestrial materials have been used to constrain the timing of impacts in the inner solar system, solidification of the lunar magma ocean, and development of planetary magnetic fields. Despite the importance of understanding these events, the samples we have in hand are non-ideal due to mixed provenance, isotopic disturbances from potentially multiple heating episodes, and laboratory artifacts such as nuclear recoil. Although models to quantitatively assess multi-domain, diffusive 40Ar⁎ loss have long been applied to terrestrial samples, their use on extra-terrestrial materials has been limited. Here we introduce a multi-activation energy, multi-diffusion domain model and apply it to 40Ar/39Ar temperature-cycling, step-heating data for meteoritic and lunar samples. We show that age spectra of extra-terrestrial materials, the Jilin chondrite (K-4) and Apollo 16 lunar breccia (67514,43)(67514,43), yielding seemingly non-ideal behavior commonly interpreted as either laboratory artifacts or localized shock heating of pyroxene, are meaningful and can be understood in context of the presence of multi-diffusion domains containing multiple activation energies. Internally consistent results from both the meteoritic and lunar samples reveal high-temperature/short duration thermal episodes we interpret as due to moderate shock heating.

A geologically supervised spectral analysis of 121 globally distributed impact craters as a tool for identifying vertical and horizontal heterogeneities in the composition of the shallow crust of Mercury

1Piero D Incecco, 1Jörn Helbert, 1Mario D Amore, 1Sabrina Ferrari, 2James W. Head, 1Alessandro Maturilli,3Harald Hiesinger
Planetary and Space Science (in Press) Link to Article [http://dx.doi.org/10.1016/j.pss.2016.08.004]
1Institute of Planetary Research, German Aerospace Center, Rutherfordstrasse 2, D-12489 Berlin, Germany
2Department of Geological Sciences, Brown University, Providence, RI 02912, USA
3Westfälische Wilhelms-Universität Münster, Institut für Planetologie, Wilhelm-Klemm Str. 10, D-48149 Münster, Germany

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Microstructures, mineral chemistry, noble gases and nitrogen in the recent fall, Bhuka iron (IAB) meteorite

1S.V.S. Murty, 1P.M. Ranjith, 1Dwijesh Ray, 1S. Ghosh, 2Basab Chattopadhyay, 3K.L. Shrivastava
Planetary and Space Science (in Press) Link to Article [http://dx.doi.org/10.1016/j.pss.2016.08.007]
1Planetary Sciences Division, Physical Research Laboratory, Ahmedabad, India
2Geological Survey of India, Kolkata
3Department of Geology, JNV University, Jodhpur, India

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