LINK<\/strong><\/a><\/p>\n\n\n\n“Zircons and apatites in clasts and matrix from the Martian breccia NWA 7034 are well documented, timing ancient geologic events on Mars. Furthermore, in this study, zircon trace elemental content, apatite volatile content, and apatite volatile isotopic compositions measured in situ could constrain the evolution of those geologic events. The U\u2010Pb dates of zircons in basalt, basaltic andesite, trachyandesite igneous clasts, and the matrix are similar (4.4 Ga) suggesting intense volcanism on ancient Mars. However, two metamict zircon grains found in the matrix have an upper intercept date of ~4465 Ma in crystalline, whereas amorphous areas have a lower intercept date of 1634 \u00b1 93 Ma. The younger date is consistent with the date of apatites (1530 \u00b1 65 Ma), suggesting a metamorphic event that completely reset the U\u2010Pb system in both the amorphous areas of zircon and all apatites. \u03b4D values in all apatites negatively correlate with water content in a two\u2010endmember mixing trend. The D (\u03b4D up to 2459\u2030) and 37Cl heavy core (3.8\u2030) of a large apatite grain suggest a D\u2010, 37Cl\u2010rich fluid during the metamorphic event ~1.6 Ga ago, consistent with the trace elements Y, Hf and Ti and P in zircons. The fluid was also therefore P\u2010rich. The D\u2010, 37Cl\u2010poor H2O\u2010rich rim (<313\u2030) suggests the degassing of water from the Martian Cl\u2010poor interior at a later time. This D\u2010, 37Cl\u2010poor Martian mantle reservoir could have derived from volcanic intrusions postdating the younger metamorphic event recorded in NWA 7034.”<\/p>\n","protected":false},"excerpt":{"rendered":"
Sen Hu, Yangting Lin, Jianchao Zhang, Jialong Hao, Weifan Xing, Ting Zhang, Wei Yang, Hitesh Changela Meteoritics & Planetary Science First Published: 3 March 2019 LINK “Zircons and apatites in clasts and matrix from the…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[122,42,46],"tags":[658,1828,183,184],"_links":{"self":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/18089"}],"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=18089"}],"version-history":[{"count":1,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/18089\/revisions"}],"predecessor-version":[{"id":18090,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/18089\/revisions\/18090"}],"wp:attachment":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=18089"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=18089"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=18089"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}