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| HighPressure Phase of Cubic CdSe in Impact Glass from Zhamanshin Crater P. M. Kartashov, T. A. Gornostaeva...arated from the sample of impact rock of the Zhamanshin crater (Central Kazakhstan). The treated mineral...at the moment of impact. DOI: 10.1134/S1028334X16040188 The Zhamanshin impact crater is located at about...rocks found in the crater were first described and were called irgizites and zhamanshin ites, respectively...the highpressure phases in zhamanshinites, only coesite and stishovite were found previously [8]; CdSe |
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| that the coesite found in high silica layered tektites indicates shock consistent with impact. It should...cristobalite as a decomposition product of 4527 coesite is inconsistent with the formation of layered tektites...1964 ) . KOEBERL( 1992) concludes that a single crater produced the Australasian tektites and that layered...cannot have travelled far from the impact. Even if this hypothetical impact site was haltway between Thailand...FUTRELL, 1986). This precludes any possibility of impact ejection ( FWTRELL, 1986). KOEBERL ( 1992) in referring |
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| Meteontical Society, 1999 Printed in USA Invited Review Impact structures of northeastern Eurasia: The territories...February 24) ~ ~ ~ ~~ Abstract-More than 30 impact structures have been discovered in the last three...Lithuania, Latvia, Estonia, Kazakhstan, and Mongolia. The largest impact events of the twentieth century...Siberia and Primorye, respectively. Many of these impact structures have been studied in detail. This is...morphology, and the nature of the impact breccias and impactites (impact-melt rocks) are to be found in |
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| AGE AND CHEMICAL COMPOSITION OF ТНЕ ZНAМANSHIN CRATER IMPACTITES AND TEKTITES AND CQMPARISON WITH AUSTRALASIAN...AGE AND CHEMICAL COMPOSITION ОР ТНЕ ZHAМANSHIN CRATER IMPACTITES AND TEKTITES. AND COMPARISON WITH AUSTRALASIAN...Korotkova. A�e . and chemical composition of the Zhamanshin Crater ...lmpactites and Tektites and comparison... ISBN 5-7323-1784-6 ТЬе Zhamanshin impact ci'ater is the only impact crater оп the Earth where impactites...various tektites and microtektites coexist. Тhus t�e Crater becomes the best object to solve the old tektite |
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| IRGHIZITES AND ZHAMANSHINITES: ZHAMANSHIN CRATER, USSR VI. Boul1ika and P. Povondra Faculty of Science...analysis of the Palaeogene quartzite from the Zhamanshin impact crater. The REE abundances of irghizites resemble...derived from terrestrial sedimentary rocks. The Zhamanshin impact glasses may be divided into three types: (a)...Florenskij (1975a) has described them from the Zhamanshin impact crater located 200 km N of Aralsk at the Aral...61°E). They are named for the Irghiz River. The Zhamanshin structure is a circle depression 5 .5-6.3 km |
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| J. Spencer suggested ejection from terrestrial impact sites. Up to the 1950s, sophisticated research...of large-scale impact sites on the Earth, and the relationship between the Ries impact structure and moldavites...moldavites, and between Bosumtwi Crater and Ivory Coast tektites, was firmly established. Then in the...areas covered by sea. Kindred occurrences at Zhamanshin and Popigai in the USSR, in a Pliocene structure...likely target area of the source impact and processes of jetting from impact sites. One tenth of the Earth's |
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| Printed in USA North American tektite debris and impact ejecta from DSDP Site 612 P. BILLY GLASS Department...in the upper half of the tektite-bearing layer. Coesite is abundant, and stishovite was found in one rock...that Site 612 is relatively close to the source crater, which may be to the north of Site 612 on the coastal...define the layer and characterize the associated impact ejecta, a series of samples was taken through the...identified for the first time: many grains contain coesite and one grain contains stishovite. Furthermore |
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| ....................... .47 The Chesapeake Bay Crater .................................................................................... 53 A Comet Impact As The Source Of The Tektites ................................. 58 The Case For The Terrestrial Impact Origin For Tektites ............. 67 Reply To O'Keefe's...trips, though mostly limited to the Georgia tektite region, compare favorably with the extensive field work...the first to propose a lunar origin by meteorite impact for tektites. Years later, Verbeek's and Nininger's |
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| personal use only. GEOCHEMISTRY OF TEKTITES AND IMPACT GLASSES Christian Koeberl Institute of Geochemistry...by melting during impact events is called impact glass or impactite. Although impact cratering produces...degree of metamorphism seen in different classes of impact materials (starting with those showing simple shock...shatter cones, diaplectic glasses, coesite, stishovite, lechatelierite, impact breccias, glass) depends on the...of mixing, brecciation, and similar processes, impact glasses also tend to include fragments of less |
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| Nong-type tektites have most probably originated during impact melting from a mixture of post-Archean sediments...from a multitude of very small impact craters. A single large impact, maybe occurring at an oblique angle...tektites in the Australasian strewn field. The crater is likely to be situated on or near Indochina,...production of tektites seems to require special impact conditions because otherwise there should be more...tektites have not travelled far from the site of the impact, which most probably occurred somewhere in Indochina |
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| tektites. Barringer (1906) staked claims to the crater that he recognized as of meteoritical origin in...ofcontroversy well documented by Hoyt (1987). That the crater now bears Barringer's name is a fitting memorial...the early investigation of the Odessa meteorite crater has been added. Because this paper is chiefly a...unless the irgizite impactites from the Zhamanshin impact crater in Russia are considered to be tektites;...unknown, or are so far removed from a possible crater of origin that special tests must be made in order |
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| paper Volatile enhanced dispersal of high velocity impact melts and the origin of tektites Kieren Torres...rocks. This produces impact melt during excavation and expansion of the transient crater cavity. The vast...vast majority of this melt is retained in the crater-fill stratigraphy where it may form coherent melt units...the crater at very high velocities – potentially faster than the impactor itself – forming impact glasses...some impacts form large volumes of high velocity impact glass and even fewer form tektites remains poorly |
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| Abstract–Tektites, natural silica-rich glasses produced during impact events, commonly contain bubbles. The paper reviews...moldavite formation. field for which no source crater has been identified yet. Tektites (both splash-form...Tektites are natural silica-rich glasses produced by impact events. Individual tektites attain typically the...5 Ma in age (associated with the Chesapeake Bay impact structure in the United States); the Central European...field, 14.7 Ma in age (associated with the Ries crater in Germany); the Ivory Coast tektite strewn field |
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| importance of being cratered: The new role of meteorite impact as a normal geological process Bevan M. FRENCH...past development of impact geology and of the newly recognized importance of impact events in terrestrial...range of impact effects preserved on the Earth, to apply the knowledge obtained from impact phenomena...exotic field of impact geology with mainstream geosciences. Since the recognition of an impact event at the...Cretaceous-Tertiary (K-T) boundary, much current activity in impact geology has been promoted by traditionally trained |
 | Goderis, S., Wittmann, A., Zaiss, J., Elburg, M., Ravizza, G., Vanhaecke, F., Deutsch, A., Claeys, P. (2013) Testing the ureilite projectile hypothesis for the El'gygytgyn impact: Determination of siderophile element abundances and Os isotope ratios in ICDP drill core samples and melt rocks. Meteoritics & Planetary Science, 48 (7) 1296-1324 doi:10.1111/maps.12047 | Journal (article/letter/editorial) |
| ureilite projectile hypothesis for the El’gygytgyn impact: Determination of siderophile element abundances...Project—El’gygytgyn lake drill core 1C is compared with that of impact melt rock fragments collected near the western...andesites were the main contributors to the polymict impact breccias. Additions of 2–13.5 vol% of basaltic...deposit at 318.9 mblf, a polymict impact breccia at 471.4 mblf, and three impact melt rock fragments. However...corresponding Ni/Cr, Ni/Co, and Cr/Co ratios of impact glass spherules and spherule fragments that were |
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| other than the suggestion that the ice in this region is probably close to a steady state condition....shocked quartz in sediments is used to identify impact events in the Earth history. When compared to the...having a square of 1.3E-18 cm-. Production rate of impact craters (> I km diameter) is 12E-13 km-/y. Time...be recrystallized. The total mass of continental impact melt is computed to be 5.6E20 g (0.3% of the total...of continental volcanic rocks) whereas that of crater ejecta is found to be 7.8E-21 g (0.6% of the total |
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| ratios. Inpre-SNII stars, the He shell is the only region with C > 0,required for graphite formation. While...DESCRIPTIONS OF IMPACT ROCKS RECOVERED BY RECENT CORE DRILLING IN THE W S O N IMPACT STRUCTURE. R. R...Iowa City IA 52242-1319, USA, 'Iowa Center for Impact Studies, c/o IDNR Geological Survey Bureau, 109...were recovered from the Manson impact structure. Four principal impact rock types were encountered (1)...metamorphic rocks (CP), and (4) an overturned flap of impact ejecta (IE). The SCB is dominated by clasts of |
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| techniques in the middle-infrared, the spectral region most diagnostic of composition; and laboratory...during flight, the Ge plates contain many extended impact features that were apparently produced by projectile...foil from the trailing edge and found extended impact features from 200 to 4000 ILm in diameter with...multi-element point analyses in lateral scans across the impact features. In all impacts so far studied we found...in the form of elemental enhancements in the impact region. One such analysis is shown in Fig. I, which |
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| . . . . . . . . . . . . . . 19 Impact as a general cause of extinction: A feasibility...metal toxicity as a seed stock kill mechanism in impact-caused mass extinctions . . . . . . . ...and Hypotheses 12. Assessment of the atmospheric impact of volcanic eruptions . Haraldur Sigurdswn 13...Observations and Effects of Large-Scale Meteorite Impact . Impact and its revolutionary implications for geology...181 Contents 22. v The formation of the Ries Crater, West Germany; Evidence of atmospheric interactions |
