 | | Journal (article/letter/editorial) | | minerals in impact melt rocks of the Boltysh structure, Ukraine E. P. GUROV*, S. B. SHEKHUNOVA, and V...National Academy of Sciences of Ukraine, Gontchara Str., 55b, Kiev, Ukraine * Corresponding author. E-mail:...opaque minerals from the impact melt rocks of the Boltysh structure, in the central part of the Ukrainian...alteration of the upper unit of the impact melt sheet. Zircon is the only accessory mineral found in impact melt...the basement granites of the Boltysh structure. INTRODUCTION The Boltysh impact structure, a circular |  | | Journal (article/letter/editorial) | | Structures Impact glass from the ~200 ka Tswaing impact crater, South Africa. PHOTO BY FRED JOURDAN Fred Jourdan1...of the sedimentary cover or the infi ll of the crater. with certainty synchronicity between a large impact...are uraniumālead (UāPb) measured on the minerals zircon and monazite, and argonāargon (40Ar/39Ar) applied...the refractory and weathering-resistant mineral zircon, is the most robust technique in conventional geochronology...restricted to rare structures in which authigenic zircon and/ or monazite have crystallized from the impact |  | | Book | | sections, where the distal ejecta from Chicxulub crater is well preserved. Scientifically, the workshop...Impact effect on climate and biosphere Ejecta-crater correlation Impact signatures and geochemical...terrestrial impact crater as a mechanism for generating melt to auto-obliterate the crater. They also model...Popigai impact crater, Siberia. Three types of ejecta facies occur in the upper parts of the crater fill: lithic...at the study and analysis of the Boltysh impact crater in the Ukraine, which initially was thought to |  | | Report (issue) | | active lava lake in the Overlook crater within the Halema'uma'u Crater and eruption center of the KÄ«lauea...6. The early Danian hyperthermal event at Boltysh (Ukraine): Relation to Cretaceous-Paleogene boundary...and Mike Widdowson 7. Plant macrofossils from Boltysh crater provide a window into early Cenozoic vegetation...layer in Texas, northeast Mexico, and the impact crater on Yucatan. She demonstrates the coincidence between...the sediments that infilled the Boltysh meteorite impact crater in Ukraine based on carbon isotopes and |  | | Journal (article/letter/editorial) | | which lie within the confines of the meteorite crater; and allogenic (allochthonous) formations, which...during the formation of the crater and deposited both within the crater and also outside it, sometimes...branching furrows (2, 9, 10, 15, 26). Outside the crater (away from the point of impact), the authigenic...amount; and 5) the variation in attitude in the crater and outside its limits. Such wide variations in...to separate them into several types. Within the crater, The polymineralic diaplectic glasses are a specific |  | MORGAN, J, LANA, C, KEARSLEY, A, COLES, B, BELCHER, C, MONTANARI, S, DIAZMARTINEZ, E, BARBOSA, A, NEUMANN, V (2006) Analyses of shocked quartz at the global K-P boundary indicate an origin from a single, high-angle, oblique impact at Chicxulub. Earth and Planetary Science Letters, 251 (3) 264-279 doi:10.1016/j.epsl.2006.09.009 | Journal (article/letter/editorial) | | coverage of proximal ejecta in this quadrant of the crater, however, suggests a relatively high impact angle...shocked terrestrial minerals (quartz, feldspar and zircon) that originated from rocks at the impact site...the Chicxulub impact crater was discovered [9] numerous studies of this crater and the KāP boundary led...of N 15Ā°. Although asymmetries in the apparent crater structure have been used to estimate impact angle...quartz is asymmetrically distributed around the crater and, if so, whether that distribution offers a |  | | Journal (article/letter/editorial) | | minor inclusions of lechatelierite, cristobalite, zircon, baddeleyite, rutile, staurolite, tourmaline, cordierite...has been unambiguously identiļ¬ed as the source crater. Recently, dark streaks present in rare LDG fragments...the presence of distinct Zr-rich spots, probably zircon or baddeleyite (Fig. 10; also see Kleinmann 1969)...various impact melt breccias, e.g., from the Boltysh crater (Grieve et al. 1987), the Ries (Engelhardt...Popigai (Kerschhofer et al. 2000), and the Roter Kamm crater (Hecht et al. 2008). Finally, low-Ca, Al-rich orthopyroxene |  | | Journal (article/letter/editorial) | | that type of low-energy impact feature (e.g., the crater-like pits produced 1. Introduction I mpact cratering...km-diameter and roughly 50 kyr-old Meteor Crater (aka Barringer Meteorite Crater) in Arizona is one of the best-preserved...terrain surrounding the crater. Note the pronounced topography of the crater indicated by low-angle sunlight...Tswaing impact crater in South Africa (e.g., Brandt and Reimold, 1995), with its crater bowl seen from...from the uplifted crater rim. After more than 2000 centuries of erosion, its topographic features have been |  | MacLagan, E. A., Walton, E. L., Herd, C. D. K., Dence, M. (2018) Investigation of impact melt in allochthonous crater-fill deposits of the Steen River impact structure, Alberta, Canada. Meteoritics & Planetary Science, 53 (11) 2285-2305 doi:10.1111/maps.13122 | Journal (article/letter/editorial) | | Investigation of impact melt in allochthonous crater-fill deposits of the Steen River impact structure...coherent sheets or lenses that form a portion of the crater-fill deposits, (2) discrete clasts within polymict...polymict breccias occurring both in and outside of the crater, (3) impact melt and melt-bearing breccias injected...injected as dykes and veinlets into the crater floor and walls, and (4) distal ejecta-forming tektite or...continuous sequence of impact breccias within the crater-fill deposits of the Steen River impact structure |  | | Journal (article/letter/editorial) | | potentially higher closure temperatures such as U/Pb on zircon and the Sm/Nd system may be too resistant to be...reviews of the geochronology of terrestrial impact crater and meteorites, the reader is referred to Jourdan...in post-impact sedimentary deposits within the crater (Partridge 1999; Koeberl et al. 2009). Knowing...paleo-continents; and (6) calibrating the timing of within-crater continental sedimentary deposits (e.g. for regional...(see above). For example, the age of Barringer Crater at 50 + 2 ka (Sutton 1985) is based on cosmic exposure |  | | Book | | illustration: Radar image of the Gosses Bluff impact crater central peak (Australia) acquired in spotlight...Atlas will be very useful to better understand crater formation and evolution and provides a new research...research method that may, hopefully, help new crater ļ¬ndings. Getting through these pages, it is then both...Maria Libera Battagliere, and Maria Virelli Boltysh, Ukraine . . . . . . . . . . . . . . . . . . . . ....Libera Battagliere, and Maria Virelli Ilyinets, Ukraine . . . . . . . . . . . . . . . . . . . . . . . |  | | Journal (article/letter/editorial) | | Honghuapu trondhjemite (450.5Ā±1.8Ma) by LAICPMS zircon U-Pb method. The formation age and tectonic setting...dating with LuāHf isotope analyses on detrital zircon grains from sediments is a powerful tool in identifying...overview of Precambrian crustal reworking and growth. Zircon U-Pb dating of sedimentary sequences from the Fanjingshan...the adjacent Jiangnan orogen. The Neoproterozoic zircon grains may be subdivided into two groups based...presence of 777-773 Ma, 770 Ma, and 783-773 Ma (zircon UPb ages) A-type granites in the southeastern, |  | | Journal (article/letter/editorial) | | IMPACT DIAMONDS IN GLASS FROM OTTING QUARRY, RIES CRATER, GERMANY. J. 1. Abbott, R. M. Hough, 1. Gilmore...base of the Otting Quarry, Ries, Germany. The Ries Crater is a 25-km-diameter, l6-m.y.-old structure formed...shallow-level impact-derived deposits makes the crater the ideal site for a detailed investigation of...acid-demineralized residues of impact melt rocks from the Ries Crater revealed the presense of impact diamonds, closely...The residue is predominantly composed of small zircon crystals that are either cloudy, white, and rounded |  | | Journal (article/letter/editorial) | | Argentina. Introduction: A new possible impact crater was discovered during routine flights by Mr. Jorge...s.l). It has 1.0 km in diameter. Results: The crater feature is a clear ring with a raised rim and a...at the top of the chain. The area all around the crater is full of radial and concentric fractures and...the structure. Conclusions: Sierra de Ambatoās crater cannot be a volcanic neck or caldera. Its morphology...there are no visible lava floods coming from the crater itself. No volcanic features have been so far reported |  | | Book | | Vermiculite 6.2.27. Vesuvianite 6.2.28. Zeolite 6.2.29. Zircon 161 161 161 162 163 163 165 165 166 166 167 167...structures 7.7.2. Thermal evolution of the Ries impact crater 7.7.3. Tektites Sea-Floor Spreading Archaeological...1987) has enabled one to obtain lattice images of zircon crystals containing uranium fission tracks. On...making different angles with the (100) plane of zircon (= plane of the picture) observed with high resolution...pictures of Fleischer et at. (1964c) of tracks in zircon, those of Wagner (1968, 1969a) of tracks in apatite |
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