LINK<\/strong><\/a><\/p>\n“We studied 149 pyroxenes from 69 pyroxene\u2010bearing micrometeorites collected from deep\u2010sea sediments of the Indian Ocean and South Pole Water Well at Antarctica, Amundsen\u2010Scott South Pole station. The minor elements in pyroxenes from micrometeorites are present in the ranges as follows: MnO ~0.0\u20130.4 wt%, Al2O3~0.0\u20131.5 wt%, CaO ~0.0\u20131.0 wt%, Cr2O3~0.3\u20130.9 wt%, and FeO ~0.5\u20134 wt%. Their chemical compositions suggest that pyroxene\u2010bearing micrometeorites are mostly related to precursors from carbonaceous chondrites rather than ordinary chondrites. The Fe\/(Fe+Mg) ratio of the pyroxenes and olivines in micrometeorites shows similarities to carbonaceous chondrites with values lying between 0 and 0.2, and those with values beyond this range are dominated by ordinary chondrites. Atmospheric entry of the pyroxene\u2010bearing micrometeorites is expected to have a relatively low entry velocity of <16 km s\u22121and high zenith angle (70\u201390\u00b0) to preserve their chemical compositions. In addition, similarities in the pyroxene and olivine mineralogical compositions between carbonaceous chondrites and cometary particles suggest that dust in the solar system is populated by materials from different sources that are chemically similar to each other. Our results on pyroxene chemical compositions reveal significant differences with those from ordinary chondrites. The narrow range in olivine and pyroxene chemical compositions are similar to those from carbonaceous chondrites, and a small proportion to ordinary chondrites indicates that dust is largely sourced from carbonaceous chondrite\u2010type bodies.\"\n<\/p>\n","protected":false},"excerpt":{"rendered":"
N. G. Rudraswami, D. Fernandes, Agnelo De Araujo, M. Shyam Prasad, S. Taylor Meteorit Planet Sci. . doi:10.1111\/maps.13105 LINK “We studied 149 pyroxenes from 69 pyroxene\u2010bearing micrometeorites collected from deep\u2010sea sediments of the Indian Ocean…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[9,3157,7],"tags":[327,644],"_links":{"self":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/14696"}],"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=14696"}],"version-history":[{"count":1,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/14696\/revisions"}],"predecessor-version":[{"id":14697,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/14696\/revisions\/14697"}],"wp:attachment":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=14696"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=14696"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=14696"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}