J
JonClarke
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<p><span style="font-size:10pt"><font face="Times New Roman">The just finished LPSC had a number of abstracts on last years Carancas impact event.<span> </span>Given the fact there still seems to be some scepticism “out there” regarding this event, here are some links to the abstracts.<span> </span>The authors included researchers from Argentina, Austria, Bolivia, Canada, Germany, Japan, Mexico, Peru, the UK, Uruguay, and the US.</font></span></p><p><span style="font-size:10pt"><font face="Times New Roman">Harris et al. PRELIMINARY PETROLOGIC ANALYSIS OF IMPACT DEFORMATION IN THE CARANCAS (PERU) CRATERING EVENT. <span> </span></font><font face="Times New Roman" color="#800080">http://www.lpi.usra.edu/meetings/lpsc2008/pdf/2446.pdf</font><font face="Times New Roman"> </font></span><span style="font-size:10pt"><font face="Times New Roman"> </font></span></p><p><span style="font-size:10pt"><font face="Times New Roman">Prado et al. <span style="color:black">THE METEORITE FALL IN CARANCAS, LAKE TITICACA REGION, SOUTHERN PERU: FIRST RESULTS. <span> </span><font color="#800080">http://www.lpi.usra.edu/meetings/lpsc2008/pdf/2555.pdf</font> </span></font></span><span style="font-size:10pt"><font face="Times New Roman"> </font></span></p><p><span style="font-size:10pt"><font face="Times New Roman">Miura MULTIPLE EXPLOSIONS DURING CRATERING AT CARANCAS METEORITE HIT IN PERU. <span> </span></font><font face="Times New Roman" color="#800080">http://www.lpi.usra.edu/meetings/lpsc2008/pdf/2027.pdf</font></span><span style="font-size:10pt"><font face="Times New Roman"> </font></span></p><p><font face="Times New Roman"><span style="font-size:10pt">Schultz et al. IMPLICATIONS OF THE CARANCAS METEORITE IMPACT.</span><span style="font-size:10pt"> <span> </span><font color="#800080">http://www.lpi.usra.edu/meetings/lpsc2008/pdf/2409.pdf</font></span></font><span style="font-size:10pt"><font face="Times New Roman"> </font></span></p><p><span style="font-size:10pt"><font face="Times New Roman">Tancredi et al <span>WHAT DO WE KNOW ABOUT THE “CARANCAS-DESAGUADERO” FIREBALL, METEORITE AND IMPACT CRATER? </span></font><font face="Times New Roman" color="#800080">http://www.lpi.usra.edu/meetings/lpsc2008/pdf/1216.pdf</font><font face="Times New Roman"> </font></span><span style="font-size:10pt"><font face="Times New Roman"> </font></span></p><p><span style="font-size:10pt"><font face="Times New Roman">The impact was an ordinary chondrite, class H4 or H5, travelling at 3-6 km/s. impacting at an angle of 45-60 degrees. <span> </span>Initial velocities were 12-18 km/s, mostly likely 16 km/s.<span> </span><span> </span>It is estimated to have had a diameter of 1.1 m, a mass of 3 tonnes, and the explosion to have been equivalent to 2 tonnes TNT. No fragment larger than a few kg was recovered.<span> </span>The meteoric material has weathered very rapidly.<span> </span>The impactor’s orbit was probably inclined at 25 degrees to the ecliptic and an aphelion inside the orbit of Jupiter.</font></span><span style="font-size:10pt"><font face="Times New Roman"> </font></span></p><p><span style="font-size:10pt"><font face="Times New Roman">The crater was 13.6 m in diameter and 1.04 m deep from the ground surface to the submerged floor. Water has risen to the ground level.<span> </span>The rim is between 1 and 3 m high. There was a strong secondary steam explosion from shallow groundwater heated by the impact.<span> </span>The crater was excavated into alluvium of a dry stream bed and has a large ray, the rim has classic inverted stratigraphy.<span> </span>The crater walls have slumped significantly because of their wet unconsolidated nature.<span> </span>Numerous microscopic shock deformation textures were observed in the ejecta.</font></span><span style="font-size:10pt"><font face="Times New Roman"> </font></span> </p><p style="margin-top:0cm;margin-left:0cm;margin-right:0cm" class="MsoNormal"><span style="font-size:10pt"><font face="Times New Roman">A paper has been submitted to the leading peer reviewed journal Earth and Planetary Science Letters.<span> </span>I have access to this at work and will keep people posted.</font></span></p><span style="font-size:10pt"><font face="Times New Roman"> </font></span><span style="font-size:10pt"><font face="Times New Roman">Jon</font></span> <div class="Discussion_UserSignature"> <p><em>Whether we become a multi-planet species with unlimited horizons, or are forever confined to Earth will be decided in the twenty-first century amid the vast plains, rugged canyons and lofty mountains of Mars</em> Arthur Clarke</p> </div>