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  • 1
    Publication Date: 2013-08-31
    Description: Uniquely fractured target rocks known as shatter cones are associated with more than one half the world's 120 or so presently known impact structures. Shatter cones are a form of tensile rock failure in which a positive conical plug separates from a negative outer cup or mold and delicate ornaments radiating from an apex are preserved on surfaces of both portions. Although distinct, shatter cones are sometimes confused with other striated geologic features such as ventifacts, stylolites, cone-in-cone, slickensides, and artificial blast plumes. Complete cones or solitary cones are rare, occurrences are usually as swarms in thoroughly fractured rock. Shatter cones may form in a zone where an expanding shock wave propagating through a target decays to form an elastic wave. Near this transition zone, the expanding primary wave may strike a pebble or other inhomogeneity whose contrasting transmission properties produce a scattered secondary wave. Interference between primary and secondary scattered waves produce conical stress fields with axes perpendicular to the plane of an advancing shock front. This model supports mechanism capable of producing such shatter cone properties as orientation, apical clasts, lithic dependence, and shock pressure zonation. Although formational mechanics are still poorly understood, shatter cones have become the simplest geologic field criterion for recognizing astroblemes (ancient terrestrial impact structures).
    Keywords: GEOPHYSICS
    Type: Lunar and Planetary Inst., Global Catastrophes in Earth History: An Interdisciplinary Conference on Impacts, Volcanism, and Mass Mortality; p 118-119
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  • 2
    Publication Date: 2013-08-31
    Description: The radar discriminability of geolian features and their geological setting as imaged by the SIR-A experiment is examined. The Gran Desierto and Pincate volcanio field of Sonora, Mexico was used to analyze the radar characteristics of the interplay of aeolian features and volcano terrain. The area in the Gran Desierto covers 4000 sq. km. and contains sand dunes of several forms. The Pincate volcanio field covers more than 2.000 sq. km. and consists primarily of basaltic lavas. Margins of the field, especially on the western and northern sides, include several maar and maar-like craters; thus obtaining information on their radar characteristics for comparison with impact craters.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: JPL-9950-1026 , NASA-CR-175711 , NAS 1.26:175711
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  • 3
    Publication Date: 2013-08-31
    Description: Impact cratering of the earth's surface is discussed and compared with lunar craters. The basic types found on earth are either simple craters or complex impact structures and basins. Meteorite fragments and shock metamorphism provide evidence of a crater's formation by meteorite impact. Known craters on earth are ordered by location and a few principal facts are given for each crater and the general terrain in which it is located. A satellite picture of each crater and maps identifying crater locations are provided.
    Keywords: GEOPHYSICS
    Type: NASA-TM-102902 , NAS 1.15:102902 , LPI-TRN-88-03
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  • 4
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    In:  Other Sources
    Publication Date: 2017-10-02
    Description: A repeating impact tool using the electrolysis of water to produce an oxygen-hydrogen propellant has been developed for in-situ planetary geology by robotic means.
    Keywords: Lunar and Planetary Science and Exploration
    Type: Lunar and Planetary Science XXXI; LPI-Contrib-1000
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  • 5
    Publication Date: 2013-08-31
    Description: Twenty-eight years after one of us argued that Sudbury was an astrobleme, this interpretation has only recently attained wide acceptance; not so for the view that the Sudbury Cu/Ni sulfide ores are cosmogenic. Other research has provided the triggering of plateau basalts by super-large impacts a modicum of respectability. The recent apparent successful tying in of the K/T extinctions to the Chicxulub astrobleme in the Yucatan encourages the search for an impact event that may have caused the other two major post-Paleozoic extinctions (P/Tr, Tr/J). This gives us heart to offer two further outrageous hypotheses. The cosmogenic concept for the Sudbury ore deposite remains viable because it is giant, nonultramafic, and unique (except for Noril'sk). The Triassic/Jurassic boundary catastrophic extinctions have been attributed to the Manicouagan asteroidal impact, but recent radiometric dating indicates these events are diachronous (Manicouagan astrobleme 212 +/- 2 Ma and Tr/J boundary 200 Ma).
    Keywords: GEOPHYSICS
    Type: Lunar and Planetary Inst., International Conference on Large Meteorite Impacts and Planetary Evolution; p 22-23
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  • 6
    Publication Date: 2014-10-09
    Description: Clouds hide the surface of Venus from all but radar imaging systems, supplemented by limited views from land spacecraft. Among the surfaces features likely to be observed by radar are craters that have formed by a variety of processes. In order to assess the radar characteristics of craters, volcanic craters and impact structures on Earth are described as imaged by the Shuttle Imaging Radar (SIR-A) experiment. Although most of the craters are small, this analysis provides insight into the ability to discriminate craters of various origins and provides some basis for interpreting radar images returned from Venus.
    Keywords: COMMUNICATIONS AND RADAR
    Type: NASA, Washington Repts. of Planetary Geol. and Geophys. Program, 1984; p 474-475
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  • 7
    Publication Date: 2019-07-13
    Keywords: Communications and Radar
    Type: American Geophysical Union, Spring Meeting; 29-May-95; Baltimore, MD; United States
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