 | Mchone, John F., Greeley, Ronald, Williams, Kevin K., Blumberg, Dan G., Kuzmin, Ruslan O. (2002) Space shuttle observations of terrestrial impact structures using SIR-C and X-SAR radars. Meteoritics & Planetary Science, 37 (3) 407-420 doi:10.1111/j.1945-5100.2002.tb00824.x | Journal (article/letter/editorial) |
| edu/meteor Space shuttle observations of terrestrial impact structures using SIR-C and X-SAR radars JOHN F...revised/arm 2001 December 6) Abstract-Ten terrestrial impact structures were imaged during two flights of the...Creek, Australia; Roter Kamm, Namibia; Zhamanshin, Kazakhstan; BP and Oasis, Libya; Aorounga, Chad; Amguid...evaluating size, location, and relative age of impact features . Regardless of wavelength or polarization...wavelengths penetrate dry sand mantles to reveal hidden crater dimensions or associated buried landforms. Radar |
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| Blue glass: A new impactite variety from Zhamanshin crater, U.S.S.R. CHRISTIAN KOEBERL af Instituteof...Aktmct-A newvarietyof impact giass has been discoveredat Zhamansbinimpact crater(U.S.S.R.).The craterhas...glass differ from the chemistryof other Sirich impact@assesfrom the Zhamanshincrater in several ways...anomaly.Impactmixing of country rocks presentat the crater seems capableof explainingthe chemistry bf the...droplet-form). They are more like tektites than like usual impact&, but still display some distinguishing ftatures |
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| and K-Ar ages in Aouelloul, Zhamanshin, + .OO and Libyan Desert impact glasses KAYO MATSUBARA,’ JUN-ICHI...been determined in seven Aouelloul impact glasses, four Zhamanshin impact glasses, and one Libyan Desert...ratio was observed in all impact glasses. The Ne concentrations in the impact glasses are of the same order...in the impact glasses are lower than in tektites. The isotopic composition of Ne in the impact glasses...Aouelloul and 0.7- 1.O Ma for Zhamanshin impact glasses. For Zhamanshin glasses, these ages are in good |
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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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| 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...diaplectic glasses, coesite, stishovite, lechatelierite, impact breccias, glass) depends on the peak pressure and...of mixing, brecciation, and similar processes, impact glasses also tend to include fragments of less |
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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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| buckshot gravel lag; 4. sandstone; 5. clay; 6. Port Campbell Limestone. dated sandstone of variable thickness...places the sandstone is underlain by a thin clay stratum while in other places the sandstone is absent...workers, e.g., “No soil and underlain by clay. Sandstone is absent at this locality (Marble one who has...ignored certain salient features of the by tan sandstone. The feet of the field assistant are even with...embedded in and clearly weathering out of the sandstone underlying the tektiterich horizon at Port Campbell |
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| revised/arm 1992 February 20) Abstract- The source crater of the youngest and largest of the tektite strewnfields...regions of the Earth, are fusion products of the impact of large meteorites or asteroids with the Earth...with the Ries crater, Germany, and the Ivory Coast strewnfield with the Bosumtwi crater, Ghana. The Australasian...youth and large size, however, the site of the impact which formed the ejecta field has not yet been...Barnes, 1990). Several investigators have proposed impact sites in or near Indochina, influenced to varying |
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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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| 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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| Nong-type tektites have most probably originated during impact melting from a mixture of post-Archean sediments...to that of the upper crust (e.g., greywacke, sandstone, shale, etc.). Local loess and soil mixtures may...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 |
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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 |
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| density/composition of material in the formation region (equilibrium). It is interesting to note that when...suggests excavation of subcrustal material in a crater or impact basin comparable in size to the planetary...orbital similarities [4]) may be ejecta from this impact [5] and direct parents of the basaltic achondrites...been reconciled with the present understanding of impact physics. Analytical spallation models [4,6] predict...Vesta" would be almost the size of Vesta! Such an impact would lead to the catastrophic disruption of both |
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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 |
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| septum and overlying regions consolidate. The denser region below the dunite septum may have remained molten...was internally heated. Peak temperatures in this region would have been 700-900K. Only Semarkona could...formed beyond this point. Apart from Semarkona the region between 78-85 km is unrepresented in the meteorite...hydrous lOPs perhaps they too were derived from this region. Afiattalab and Wasson, 1980. GCA 44,431-446. Alexander...parent body which was disrupted by a catastrophic impact. Many imaginative reconstructions of former planetesimals |
