{"id":19533,"date":"2019-05-15T13:31:05","date_gmt":"2019-05-15T11:31:05","guid":{"rendered":"http:\/\/karmaka.de\/?p=19533"},"modified":"2019-05-15T13:31:07","modified_gmt":"2019-05-15T11:31:07","slug":"the-early-geological-history-of-the-moon-inferred-from-ancient-lunar-meteorite-miller-range-13317","status":"publish","type":"post","link":"https:\/\/karmaka.de\/?p=19533","title":{"rendered":"The early geological history of the Moon inferred from ancient lunar meteorite Miller Range 13317<span class=\"badge-status\" style=\"background:#787878\">OPEN ACCESS<\/span>&nbsp;"},"content":{"rendered":"\n<p>N. M. Curran, K. H. Joy, J. F. Snape, J. F. Pernet\u2010Fisher, J. D. Gilmour, A. A. Nemchin, M. J. Whitehouse, R. Burgess<\/p>\n\n\n\n<p>Meteoritics &amp; Planetary Science<\/p>\n\n\n\n<p>First Published: 14 May 2019<\/p>\n\n\n\n<p><a href=\"https:\/\/onlinelibrary.wiley.com\/doi\/full\/10.1111\/maps.13295\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>LINK (OPEN ACCESS)<\/strong><\/a><br>\n<a href=\"https:\/\/onlinelibrary.wiley.com\/doi\/epdf\/10.1111\/maps.13295\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>PDF (OPEN ACCESS)<\/strong><\/a><\/p>\n\n\n\n<p class=\"justify-text\">&#8220;Miller Range (MIL) 13317 is a heterogeneous basalt\u2010bearing lunar regolith breccia that provides insights into the early magmatic history of the Moon. MIL 13317 is formed from a mixture of material with clasts having an affinity to Apollo ferroan anorthosites and basaltic volcanic rocks. Noble gas data indicate that MIL 13317 was consolidated into a breccia between 2610 \u00b1 780 Ma and 1570 \u00b1 470 Ma where it experienced a complex near\u2010surface irradiation history for ~835 \u00b1 84 Myr, at an average depth of ~30 cm. The fusion crust has an intermediate composition (Al2O3 15.9 wt%; FeO 12.3 wt%) with an added incompatible trace element (Th 5.4 ppm) chemical component. Taking the fusion crust to be indicative of the bulk sample composition, this implies that MIL 13317 originated from a regolith that is associated with a mare\u2010highland boundary that is KREEP\u2010rich (i.e., K, rare earth elements, and P). A comparison of bulk chemical data from MIL 13317 with remote sensing data from the Lunar Prospector orbiter suggests that MIL 13317 likely originated from the northwest region of Oceanus Procellarum, east of Mare Nubium, or at the eastern edge of Mare Frigoris. All these potential source areas are on the near side of the Moon, indicating a close association with the Procellarum KREEP Terrane. Basalt clasts in MIL 13317 are from a very low\u2010Ti to low\u2010Ti (between 0.14 and 0.32 wt%) source region. The similar mineral fractionation trends of the different basalt clasts in the sample suggest they are comagmatic in origin. Zircon\u2010bearing phases and Ca\u2010phosphate grains in basalt clasts and matrix grains yield 207Pb\/206Pb ages between 4344 \u00b1 4 and 4333 \u00b1 5 Ma. These ancient 207Pb\/206Pb ages indicate that the meteorite has sampled a range of Pre\u2010Nectarian volcanic rocks that are poorly represented in the Apollo, Luna, and lunar meteorite collections. As such, MIL 13317 adds to the growing evidence that basaltic volcanic activity on the Moon started as early as ~4340 Ma, before the main period of lunar mare basalt volcanism at ~3850 Ma.&#8221;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>N. M. Curran, K. H. Joy, J. F. Snape, J. F. Pernet\u2010Fisher, J. D. Gilmour, A. A. Nemchin, M. J. Whitehouse, R. Burgess Meteoritics &amp; Planetary Science First Published: 14 May 2019 LINK (OPEN ACCESS)&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[41,115],"tags":[1827,3324,4677,4676,4979,1857],"_links":{"self":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/19533"}],"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=19533"}],"version-history":[{"count":1,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/19533\/revisions"}],"predecessor-version":[{"id":19534,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/19533\/revisions\/19534"}],"wp:attachment":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=19533"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=19533"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=19533"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}