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Hydrocode Simulation of the Ries Crater Impact This work was conducted as part of a

Hydrocode Simulation of the Ries Crater Impact This work was conducted as part of a NASA Astrobiology project (David A. Kring, PI). The modeling team included Elisabetta Pierazzo Joseph N. Spitale David A. Kring. Ries Crater. Ries Crater Complex Crater 24-26 km final crater

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Hydrocode Simulation of the Ries Crater Impact This work was conducted as part of a

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  1. Hydrocode Simulation of the Ries Crater Impact This work was conducted as part of a NASA Astrobiology project (David A. Kring, PI). The modeling team included Elisabetta Pierazzo Joseph N. Spitale David A. Kring

  2. Ries Crater • Ries Crater • Complex Crater • 24-26 km final crater • diameter • 12-16 km transient • crater diameter • The impact occurred 14 • to 15 Ma • The larger crater of a • binary impact with a • WSW to ENE • trajectory; the other • crater is called • Steinheim Kring (2005)

  3. Ries Target Sequence • Ries Crater • The target sequence is • composed of 600 m of • sedimentary lithologies • and an underlying • granitic basement • A computer hydrocode • called CTH was used to • model the impact event. • The Malmian limestone • thickens from the north • to the south. For the • model, and average • thickness of 150 m was • utilized. Pierazzo, Spitale, & Kring (2001)

  4. Hydrocode Simulation of Ries Impact Movie of Impact Pierazzo, Spitale, & Kring (2001)

  5. Ries Target Sequence • Ries Crater • Four time-steps in the • hydrocode simulation of • the impact event • The projectile is 1.6 km in • diameter and strikes at • an angle of 45º at a • velocity of 15 km/s. • The trajectory is from • WSW to ENE (left to • right), so a plume of • ejecta is thrown down- • range (to the right). Pierazzo, Spitale, & Kring (2001)

  6. Ries Target Sequence • Ries Crater • Schematic view of the • Ries and Steinheim • craters after the impact • event • Because a sea cross-cut • the ejecta ENE of the • crater, a lot of that • material was eroded. • The best preserved • impact ejecta deposits • occur to the south of • the crater

  7. Reconstruction of Ries Transient Crater • Transient crater • Melt (dark gray zone) • extended to a depth • slightly greater than 2 km • and was dominated by • silicate basement • lithologies • The excavation depth • (medium gray zone) • approached 2 km • The transient crater depth • of disturbed rock (light • gray zone) approached 5 • km • Fracturing of the crust • extended to depths of • about 6 km Kring (2005)

  8. References D.A. Kring (2005) Hypervelocity collisions into continental crust composed of sediments and an underlying crystalline basement: comparing the Ries (~24 km) and Chicxulub (~180 km) impact craters. Chemie der Erde 65, 1-46, invited review. E. Pierazzo, J.N. Spitale, and D.A. Kring (2001) Hydrocode modeling of the Ries impact event. Lunar and Planetary Science XXXII, Abstract #2106.

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