 | HECHT, Lutz, REIMOLD, W. Uwe, SHERLOCK, Sarah, TAGLE, Roald, KOEBERL, Christian, SCHMITT, Ralf-Thomas (2008) New impact-melt rock from the Roter Kamm impact structure, Namibia: Further constraints on impact age, melt rock chemistry, and projectile composition. Meteoritics & Planetary Science, 43 (7) 1201-1218 doi:10.1111/j.1945-5100.2008.tb01123.x | Journal (article/letter/editorial) |
| org New impact-melt rock from the Roter Kamm impact structure, Namibia: Further constraints on impact age...discovered on the southsouthwestern rim of the Roter Kamm impact structure. While the sub-samples from...analyzed impact-melt rock sample from Roter Kamm. Both Roter Kamm impact-melt rock samples analyzed to...indicate an ordinary chondritic composition for the Roter Kamm impactor. Laser argon dating of two sub-samples...for the other. Clearly a post-5 Ma impact at Roter Kamm remains indicated, but further analytical work |
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| a-cristobalite. Their occurrence together with lechatelierite indicates quick heating of the source rock...quantity between the sand dunes of the southern region of the Great Sand Sea of southwest Egypt. The irregularly...glassy groundmass with minor inclusions of lechatelierite, cristobalite, zircon, baddeleyite, rutile...mature sandstones such as those occurring in the region as the Nubian Sandstone Formation. Especially enrichments...has been unambiguously identified as the source crater. Recently, dark streaks present in rare LDG fragments |
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| In only a minute after the impact, a transient crater about 100 km across has been excavated, cutting...crustal rocks. The edge of the growing transient crater is marked by a curtain of material that is being......................... 17 3.1. Shock Waves and Crater Formation ........................................... 18 3.1.2. Excavation Stage: The Transient Crater .............................................................................. 65 5.4. Crater Interior: Crater-Fill Deposits (Breccias and Melt Rocks) |
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| 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 |
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| 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 findings. Getting through these pages, it is then both...Maria Libera Battagliere, and Maria Virelli Roter Kamm, Namibia . . . . . . . . . . . . . . . . . . . . ...estimated that the meteorite that formed the Chicxulub crater (Fig. 1), and started the great mass extinction |
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| Broad-band photometry in the visual wavelength region has been used to divide the asteroids into 14 "taxonomic...38 well documented finds are recorded from the region, comprising three irons, one stony-iron (pallasite)...associated with the description of meteorites from the region. In the past (e.g. McCall and Cleverly, 1970),...along the Trans Australian Railway bisecting the region from west to east. Additionally, there are a few... were obtained of a complex iron surface (an 8 mm crater produced in an experimental hypervelocity, metal |
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| its satellites) to be modified by numerous large crater structures, then we should look for such scars...Reconsideration of, the Dalgaranga Meteorite and Crater, Western Austra l i a Mineralog. Mag. 35:476--4...82 ( 1965) 39 47 MADIGAN, C. T . : The Boxhole Crater and Huck itta Meteorite Royal Soc. South Australia...F. C. MICHEL: 10 MILTON, Structu re of a Ray Crater at Henbury, Northern Territory, Australia U. S...11 SEDDON, G.: 12 SHOEMAKER, E. M.: Meteor Crater: A Geological Debate /our. Geo/. Soc. Aust. 1 7 |
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| other than the suggestion that the ice in this region is probably close to a steady state condition....of continental volcanic rocks) whereas that of crater ejecta is found to be 7.8E-21 g (0.6% of the total...However most of shocked quartz obviously resided in crater cavities and did not take part in sedimentary processes...element profiles with spatial resolution in the !Lm region and sensitivities of a few ppm has been demonstrated...documented in "North American Tektites". Also that lechatelierite, identified in tektites for the first time |
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| AFRICA: AN UNUSUAL, APPROXIMATELY 90-KILOMETER CRATER WITH ASSOCIATED MULTIRING STRUCTURES AND EARLY...opportunity to study the anatomy of a possible multiring crater. This structure is not exposed, but is easily drilled...percussion and diamond drill boreholes sited within the crater. Additional data was acquired from the stratigraphic...investigation shows that the core of the Morokweng crater is magnetically very complex and occupied by a...-90 km, up to -170 km), have their center in the crater and define a broad crustal uplift known as the |
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| 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 |
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| of -60 em- for craters> I to 2 urn in size. The crater density is much lower on the trailing edge due...Cambridge, MA 02138, USA. A location for the KIT impact crater has been sought for more than a decade. In the...impact crater lying off the southern coast of western Cuba (3). The locus of this putative crater is some...some Abstracts 1350 km north of the crater site in the Colombian basin proposed by Hildebrand and Boynton...explained by plate tectonic modification of an impact crater and its environs. The area of Cuba was once attached |
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| techniques in the middle-infrared, the spectral region most diagnostic of composition; and laboratory...the form of elemental enhancements in the impact region. One such analysis is shown in Fig. I, which shows...lie in the ecliptic plane outside the planetary region, providing a source for short period comets. PIXE...relied on qualitative descriptions of martian impact crater degradation. The present study is quantifying the...the current crater shape to those values expected for a fresh crater of identical size. Crater diameters |
