¹H.M.Sargeant,¹F.A.J.Abernethy,¹S.J.Barber,¹I.P.Wright,¹M.Anand,¹S.Sheridan,¹A.Morse
Planetary and Space Science (in Press) Link to Article [https://doi.org/10.1016/j.pss.2019.104751]
¹The Open University, United Kingdom

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¹Stefan Linke,²Lisa Windisch,³Nico Kueter,⁴Jan Egil Wanvik,¹Anna Voss,¹Enrico Stoll,²Carsten Schilde,²Arno Kwade
Planetary and Space Science (in Press) Link to Article [https://doi.org/10.1016/j.pss.2019.104747]
¹Institute of Space Systems, TU Braunschweig, Hermann-Blenk-Straße 23, 38108 Brauschweig, Germany
²Institute for Particle Technology, TU Braunschweig, Volkmaroder Straße 5, 38104 Braunschweig, Germany
³Institute of Geochemistry and Petrology, Federal Institute of Technology (ETH) Zurich, Clausiusstrasse 25, 8092, Zurich, Switzerland
⁴Geological Survey of Norway, Leiv Eiriksons vei 39, 7040 Trondheim, Norway

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^1,2Sheng Gou,^1,2,3 Kaichang Di,^1,3Zongyu Yue,¹Zhaoqin Liu,⁴Zhiping He,⁴Rui Xu,⁵Honglei Lin,^1,2Bin Liu,¹Man Peng,¹Wenhui Wan,¹Yexin Wang,⁶Jianzhong Liu
Earth and Planetary Science Letters 528, 115829 Link to Article [https://doi.org/10.1016/j.epsl.2019.115829]
¹State Key Laboratory of Remote Sensing Science, Institute of Remote Sensing and Digital Earth, Chinese Academy of Sciences, Beijing 100101, China
²State Key Laboratory of Lunar and Planetary Sciences, Macau University of Science and Technology, Macau, China
³CAS Center for Excellence in Comparative Planetology, Hefei 230026, China
⁴Key Laboratory of Space Active Opto-Electronics Technology, Shanghai Institute of Technical Physics, Chinese Academy of Science, Shanghai 200083, China
⁵Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
⁶Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China
Copyright Elsevier

China’s Chang’e-4 spacecraft achieved the first ever soft-landing within the South Pole-Aitken (SPA) basin on the farside of the Moon. The Chang’e-4 rover, named Yutu-2, made in-situ spectral observations on lunar regolith and a rock fragment at 11 locations during a nominal three-month mission period. The lunar regolith has a relative high olivine/pyroxene ratio, with the pyroxene being chiefly Mg-rich Low-Ca pyroxene (LCP). The rock fragment has a similar Mg-rich composition to that of the regolith. According to the surrounding topographic and geologic context, though originating from the lower base of a differentiated melt pool cannot be excluded here, the rover observed regolith and rock fragment are very likely to be lunar mantle materials excavated from nearby Finsen crater.

^1,2Toni Schulz,¹Florian Sackl,¹ Elisabeth Fragner,³Ambre Luguet,^3,4David Van Acken,⁵Begosew Abate,⁶Dimitri D.Badjukov,^1,7Christian Koeberl
Geochimica et Cosmochimica Acta (in Press) Link to Article [https://doi.org/10.1016/j.gca.2019.08.045]
¹Department of Lithospheric Research, University Vienna, Althanstrasse 14, 1090 Vienna, Austria
²Institut für Geologie und Mineralogie, Universität zu Köln, Zülpicher Strasse 49b, 50674 Köln, Germany
³Steinmann-Institut für Geologie, Mineralogie and Paläontologie, Universität Bonn, Poppelsdorfer Schloss, 53115 Bonn, Germany
⁴Irish Centre for Research in Applied Geosciences (iCRAG), UCD School of Earth Sciences, University College Dublin, Belfield, Dublin 4, Ireland
⁵Orbit Ethiopia PLC, Addis Ababa, Ethiopia
⁶Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Science, 19 Kosygin Str., 119991 Moscow, Russia
⁷Natural History Museum, Burgring 7, 1010 Vienna, Austria
Copyright Elsevier

The Zhamanshin impact structure, which is about 1 Myr old, has a diameter of 14-km and is situated in the semi-arid region of Kazakhstan (48°24’N,60°58’E). It has a heterogeneous suite of target rocks, including predominantly crustal lithologies (e.g., clays and siltstones) with minor ultramafics.
Zhamanshin is known for its unique association of impact glasses, including basic and acidic varieties of zhamanshinites and (tektite-like and few aerodynamically-shaped) irghizites. The origin of both of these impact glasses has long been debated, which is complicated by incomplete sampling of target lithologies at the Zhamanshin site and a limited number of isotopic analyses. However, such studies are a prerequisite for a comprehensive discussion of the mechanisms that formed the unique association of different impact glasses in one impact event.
We present major- and trace element contents, as well as combined Sr-Nd isotope data for target rocks and impact glasses from the Zhamanshin impact structure. These data, for the first time, include Paleogene clays and siltstones from a core drilled in the vicinity of the crater and cutting through all major lithologies. The core samples represent an important source lithology for the impactites from the Zhamanshin area.
Mixing calculations, based on the geochemical data and Sr-Nd isotope signatures, indicate that irghizites and Si-rich zhamanshinites can be produced from variously homogenized mixtures of mainly clays and siltstones with minor additions of ultrabasic rocks. Based on highly siderophile element (HSE) and Os isotope data (including the first analyses of the clay and siltstone lithologies) we calculated a hypothetical Os composition of the irghizite precursor, allowing us to approximate a chondritic admixture to the irghizites of roughly 1% of a chondritic component. This confirms previous suggestions about the amount of extraterrestrial components. A new HSE and Os isotope dataset for five zhamanshinites reveals, on average, crust-like HSE concentrations and Os isotope compositions confirming earlier suggestions of a lack of meteoritic admixtures to these impact glasses.