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Found 92 matches
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  1. ... 611 North Pleasant Street, Amherst, MA 01331, amueller@geo.umass.edu, TRUSDELL, Frank A., Hawaiian Volcano Observatory, United States Geol Survey, 1 Crater Rim Drive, Hawaii Volcanoes National Park, HI 96718-0051, and RHODES, J. Michael, Geosciences, Univ of Massachusetts, 611 North Pleasant Street ...
  2. ... Resources, Mineral House, 100 Plain Street, East Perth 6004, kath.grey@doir.wa.gov.au The c.580 (Ediacaran) Acraman impact event formed a collapse crater ~90 km in diameter, scattered ejecta across 1000 km of Australia, and may have produced a dust cloud large enough to block out sunlight and cause ...
  3. ... using HRSC-SRC data, and will discuss future imaging plans throughout the remainder of Mars Express’ two Earth-year nominal mission. For example, crater counts on HRSC images suggest that the caldera floors of Mars’ large shield volcanoes are as young as 100-400 million years in age, indicative of geologically ...
  4. ... -type impactite units of drill core Yaxcopoil-1 (Yax-1), Chicxulub impact structure, Mexico [1] and 39 zircons from impact melt rocks of the Popigai crater, Siberia [2] were analyzed in thin section. The full range of progressive shock metamorphic features are developed in the Yax-1 zircons: 57 grains ...
  5. ... ATHENA SCIENCE TEAM, the, NASA Jet Propulsion Lab, Pasadena, CA 91109 On January 3 2004, the NASA Spirit rover landed on the plains inside the Gusev Crater in the southern hemisphere of Mars, and has made observations of the landing site and nearby region in visual and infrared wavelengths, as well ...
  6. ... and there is no geochemical for alteration by hydrothermal fluids. The origin of the CRM is enigmatic. It is not clear that the CRM present in the crater is directly related to the impact, as a similar component is found in undeformed limestones outside of the crater. The CRM does appear to be more ...
  7. ... , Reston, VA 20192 In 2004, at Cape Charles, Va., the USGS drilled an 823 m test hole into the east flank of the central uplift within the central crater of the late Eocene Chesapeake Bay impact structure. Cores were recovered from depths of 823-744 m and 433-427 m, and cuttings were collected from the ...
  8. ... shock melting and vaporization, and require simulations with high spatial resolution near the impact point. Late stages investigate the process of crater collapse, modeling the formation of the final impact structure, and require long integration time and a large spatial mesh. Continuous improvement ...
  9. ... megaregolith holding concentrated brines and salts (Knauth and Burt, 2002; Burt and Knauth, 2003). The Opportunity site lies among possible rampart craters and ejecta aprons usually interpreted as the result of impact into wet targets. Owing to evaporation followed by fractional crystallization during ...
  10. ... stratigraphic interval within this unit. The upper volcanic units intercalated within the rocks of Pavits Spring have been identified as part of the Crater Flat Group (13.2 Ma), which erupted from the Silent Canyon Caldera. The Silent Canyon Caldera is located within the Southwest Nevada volcanic field ...

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