The most popular papers in October on Cosmochemistry Paper were:

1-Schmieder M, Schwarz WH, Trieloff M, Tohver E,Buchner E, Hopp J,Osinski GR (2014) New 40Ar/39Ar dating of the Clearwater Lake impact structures (Québec, Canada) – Not the binary asteroid impact it seems? Geochimica et Cosmoschimica Acta (in Press)
Link to Article [DOI: 10.1016/j.gca.2014.09.037]

2-Cartier C, Hammouda T, Boyet M, Bouhifd MA, DevidalJ-L (2014) Redox control of the fractionation of niobium and tantalum during planetary accretion and core formation. Nature Geoscience 7, 573–576
Link to Articel [doi:10.1038/ngeo2195

3-Schrader DL, Davidson J, Greenwood RC, Franchi IA, Gibson JM (2014) A water–ice rich minor body from the early Solar System: The CR chondrite parent Asteroid. Earth and Planetary Science Letters 407, 48-60
Link to Article [DOI: 10.1016/j.epsl.2014.09.030]

Cleeves LI, Bergin EA, Alexander CMOD, Du F, Graninger D, Öberg KI, Harries TJ (2014) The ancient heritage of water ice in the solar System. Science 345, 1590-1593
Link to Article [DOI: 10.1126/science.1258055]

Mikhail S, Sverjensky DA (2014) Nitrogen speciation in upper mantle fluids and the origin of Earth’s nitrogen-rich atmosphere. Nature Geoscience (in Press)
Link to Article [doi:10.1038/ngeo2271]

^1,2Janice L. Bishop, ³Peter A. J. Englert, ^1,4Shital Patel, ⁵Daniela Tirsch, ⁶Alex J. Roy, ^7,8Christian Koeberl,⁵Ute Böttger, ^5,9Franziska Hanke, ⁵Ralf Jaumann
¹Carl Sagan Center, SETI Institute, 189 Bernardo Avenue, Mountain View, CA, USA
²NASA Ames Research Center, Moffett Field, CA, USA
³Hawaii Institute of Geophysics and Planetology, University of Hawaii at Mânoa, HI, USA
⁴Department of Chemistry, San Jose State University, San Jose, CA, USA
⁵German Aerospace Center (DLR), Berlin, Germany
⁶Department of Land and Natural Resources, Honolulu, HI, USA
⁷Department of Lithospheric Research, University of Vienna, Althanstrasse 14, 1090 Vienna, Austria
⁸Natural History Museum, Burgring 7, 1010 Vienna, Austria
⁹Technische Universität Berlin, Berlin, Germany

We currently do not have a copyright agreement with this publisher and cannot display the abstract here

Reference
Bishop JL, Englert PAJ, Patel S, Tirsch D, Roy AJ, Koeberl C, Böttger U, Hanke F, Jaumann R (2014) Mineralogical analyses of surface sediments in the Antarctic Dry Valleys: coordinated analyses of Raman spectra, reflectance spectra and elemental abundances. Philosophical Transactions Royal Society A, 372, 2030
Link to Article [doi: 10.1098/rsta.2014.0198]

¹S.E.Braden,
¹J. D. Stopar,
¹M. S. Robinson,
¹S. J. Lawrence,
²C. H. van der Bogert
²H. Hiesinger
¹School of Earth and Space Exploration, Arizona State University, 1100 S. Cady Mall, Interdisciplinary A, Tempe, Arizona 85287-3603, USA
²Institut für Planetologie, Westfälische Wilhelms-Universität Münster, Wilhelm-Klemm-Str. 10, 48149 Münster, Germany

We currently do not have a copyright agreement with this publisher and cannot display the abstract here

Reference
Braden SE, Stopar JD, Robinson MS, Lawrence SJ, van der Bogert CH, Hiesinger H (2014) Evidence for basaltic volcanism on the Moon within the past 100 million years. Nature Geoscience 7, 787–791.
Link to Article [doi:10.1038/ngeo2252]

¹Peter H. Schultz, ¹Clara A. Eberhardy
¹Department of Earth, Environmental, and Planetary Sciences, 324 Brook Street, Brown University, Providence, RI 02912

High-speed spectra of hypervelocity impacts at the NASA Ames Vertical Gun Range (AVGR) captured the rapidly evolving conditions of impact-generated vapor as a function of impact angle, viewpoint, and time (within the first 50 μs). Impact speeds possible at the AVGR (< 7 km/s) are insufficient to induce significant vaporization in silicates, other than the high-temperature (but low-mass) jetting component created at first contact. Consequently, this study used powdered dolomite as a proxy for surveying the evolution and distribution of chemical constituents within much longer lasting vapor. Seven separate telescopes focused on different portions of the impact vapor plume and were connected through quartz fibers to two 0.35 cm monochromaters. Quarter-space experiments reduced the thermal background and opaque phases due to condensing particles and heated projectile fragments while different exposure times isolated components passing through different the fields of view, both above and below the surface within the growing transient cavity. At early times (< 5 μs), atomic emission lines dominate the spectra. At later times, molecular emission lines dominate the composition of the vapor plume times along a given direction. Layered targets and target mixtures isolated the source revealed that much of the vaporization comes from the uppermost surface. Collisions by projectile fragments downrange also make significant contributions for impacts below 60° (from the horizontal). Further, impacts into mixtures of silicates with powdered dolomite reveal that frictional heating must play a role in vapor production. Such results have implications for processes controlling vaporization on planetary surfaces including volatile release, atmospheric evolution (formation and erosion), vapor generated by the Deep Impact collision, and the possible consequences of the Chicxulub Impact.

Reference
Schultz PH, Eberhardy CA (2014) Spectral Probing of Impact-Generated Vapor in Laboratory Experiments. Icarus (in Press)
Link to Article [DOI: 10.1016/j.icarus.2014.10.041]

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