LINK<\/strong><\/a><\/p>\n“The disruption of the L chondrite parent body (LCPB) at ~470 Ma is currently the best\u2010documented catastrophic celestial impact event, based on the large number of L chondritic materials associated with this event. Uranium\u2010lead (U\u2010Pb) dating of apatite and its high\u2010pressure decomposition product, tuite, in the Sixiangkou L6 chondrite provides a temporal link to this event. The U\u2010Pb system of phosphates adjacent to shock melt veins was altered to varying degrees and the discordance of the U\u2010Pb system correlates closely with the extent of apatite decomposition. This suggests that the U\u2010Pb system of apatite could be substantially disturbed by high\u2010temperature pulse during shock compression from natural impacts, at least on the scale of mineral grains. Although many L chondrites can be temporally related to the catastrophic LCPB impact event, the shock conditions experienced by each individual meteorite vary. This could be due to the different geologic settings of these meteorites on their parent body. The shock pressure and duration derived from most meteorites may only reflect local shock features rather than the impact conditions, although they could provide lower limits to the impact conditions. The Sixiangkou shock duration (~4 s), estimated from high\u2010pressure transformation kinetics, provides a lower limit to the high\u2010pressure pulse of the LCPB disruption impact. Combined with available literature data of L chondrites associated with this impact event, our results suggest that the LCPB suffered a catastrophic collision with a large projectile (with a diameter of at least 18\u201322 km) at a low impact velocity (5\u20136 km s\u22121). This is consistent with astronomical estimates based on the dynamical evolution of L chondritic asteroids.”<\/p>\n","protected":false},"excerpt":{"rendered":"
Li, S. and Hsu, W. Meteorit Planet Sci. . doi:10.1111\/maps.13110 LINK “The disruption of the L chondrite parent body (LCPB) at ~470 Ma is currently the best\u2010documented catastrophic celestial impact event, based on the large…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[23,7,127],"tags":[1815,325,1807,4516],"_links":{"self":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/14780"}],"collection":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=14780"}],"version-history":[{"count":1,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/14780\/revisions"}],"predecessor-version":[{"id":14781,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/14780\/revisions\/14781"}],"wp:attachment":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=14780"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=14780"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=14780"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}