{"id":34419,"date":"2023-10-18T20:58:11","date_gmt":"2023-10-18T18:58:11","guid":{"rendered":"https:\/\/karmaka.de\/?p=34419"},"modified":"2023-10-18T20:58:12","modified_gmt":"2023-10-18T18:58:12","slug":"fitting-thermal-evolution-models-to-the-chronological-record-of-erg-chech-002-and-modeling-the-ejection-conditions-of-the-meteorite","status":"publish","type":"post","link":"https:\/\/karmaka.de\/?p=34419","title":{"rendered":"Fitting Thermal Evolution Models to the Chronological Record of Erg Chech 002 and Modeling the Ejection Conditions of the Meteorite<span class=\"badge-status\" style=\"background:#787878\">OPEN ACCESS<\/span>&nbsp;"},"content":{"rendered":"\n<p>Wladimir Neumann, Robert Luther, Mario Trieloff, Philip M. Reger and Audrey Bouvier<\/p>\n\n\n\n<p>The Planetary Science Journal, Volume 4, Number 10<\/p>\n\n\n\n<p><a href=\"https:\/\/iopscience.iop.org\/article\/10.3847\/PSJ\/acf465\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>LINK (OPEN ACCESS)<\/strong><\/a><br><a href=\"https:\/\/iopscience.iop.org\/article\/10.3847\/PSJ\/acf465\/pdf\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>PDF (OPEN ACCESS)<\/strong><\/a><\/p>\n\n\n\n<p class=\"justify-text\">&#8220;The history of accretion and differentiation processes in the planetesimals is provided by various groups of meteorites. Sampling different parent body layers, they reveal the circumstances of the metal\u2013silicate segregation and the internal structures of the protoplanets. The ungrouped achondrite Erg Chech 002 (EC 002) added to the suite of samples from primitive igneous crusts. Here we present models that utilize thermochronological data for EC 002 and fit the accretion time and size of its parent body to these data. The U-corrected Pb\u2013Pb pyroxene, Pb\u2013Pb phosphate, and Ar\u2013Ar ages used imply a best-fit planetesimal with a radius of 20\u201330 km that formed at 0.1 Ma after calcium-aluminum-rich inclusions. Its interior melted early and differentiated by 0.5 Ma, allowing core and mantle formation with a transient lower mantle magma ocean and a melt fraction of &lt;25% at the meteorite layering depth. EC 002 formed from this melt at a depth of 0.8 km in a partially differentiated region covered by an undifferentiated crust. By simulating collisions with impactors of different sizes and velocities, we analyzed the minimum ejection conditions of EC 002 from its original parent body and the surface composition of the impact site. The magma ocean region distinct from the layering depth of EC 002 implies that it was not involved in the EC 002 genesis. Our models estimate closure temperatures for the Al\u2013Mg ages as 1030\u20131200 K. A fast parent body cooling attributes the late Ar\u2013Ar age to a local reheating by another, late impact.&#8221;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Wladimir Neumann, Robert Luther, Mario Trieloff, Philip M. Reger and Audrey Bouvier The Planetary Science Journal, Volume 4, Number 10 LINK (OPEN ACCESS)PDF (OPEN ACCESS) &#8220;The history of accretion and differentiation processes in the planetesimals&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[28,137,507],"tags":[682,2669,550,5832,5017,649,257,2285],"_links":{"self":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/34419"}],"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=34419"}],"version-history":[{"count":1,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/34419\/revisions"}],"predecessor-version":[{"id":34420,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/34419\/revisions\/34420"}],"wp:attachment":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=34419"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=34419"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=34419"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}