LINK<\/strong><\/a><\/p>\n\n\n\n“Highlights<\/p>\n\n\n\n
\u2022 Detailed spectroscopic and compositional studies of the materials within and surrounding Von K\u00e1rm\u00e1n crater produce a complete geologic view for the Chang\u2019E\u22124 landing site.
\n\u2022 Mare basalts with low-Ti composition and model ages of \u223c3.7\u202fGa and \u223c3.6\u202fGa have distinct mineral compositions from the Chang\u2019E\u22123 landing site, including no olivine enrichment.
\n\u2022 The non-mare materials show an Mg-rich character for pyroxene, with Finsen crater material (and its ejecta) with a higher Ca\/Fe ratio than other parts of the rim of Von K\u00e1rm\u00e1n crater.
\n\u2022 The Von K\u00e1rm\u00e1n mare basalts show obvious compositional heterogeneity and complex mixing effects with non-mare ejecta from subsequent impacts (e.g., Eratoshenian-aged Finsen impact).”<\/p>\n\n\n\n
“As the first lunar farside landed mission, China’s Chang\u2019E\u22124 (CE-4) has safely landed on the volcanically resurfaced floor of Von K\u00e1rm\u00e1n crater in South Pole-Aitken (SPA) basin. The CE-4 mission will conduct rover exploration by Yutu-2 similar to what Chang\u2019E\u22123 did in the northern Imbrium basin. Here we present a comprehensive study of the composition, mineralogy, and chronology of the basaltic and nonmare units in this crater, with the intent to provide context for the compositional properties of the landing site. Compositional maps (FeO, TiO2, Mg#, and Th) demonstrate the heterogeneous distribution of mare and nonmare materials. Using a spectral survey of 1899 small impact craters (<1\u202fkm in diameter), we present a mineral map of high-Ca to low-Ca pyroxene ratio that is useful to untangle the effects of spectral mixing of these materials. Mare basalts with low-Ti composition and model ages of \u223c3.7\u202fGa and \u223c3.6\u202fGa have distinct mineral compositions that differ from the Chang\u2019E\u22123 landing site, including no olivine enrichment. The non-mare materials have Mg-rich pyroxene, and Finsen crater materials (and Finsen ejecta) have higher Ca\/Fe ratios than other parts of the rim of Von K\u00e1rm\u00e1n crater, indicating compositional anomaly of the SPA basin. The Von K\u00e1rm\u00e1n mare basalts show obvious compositional heterogeneity and complicated mixing effects with non-mare ejecta from subsequent impacts (e.g., the Eratoshenian-aged Finsen impact). We also present a geological map of the landing site, which reveals the geologic history of the landing region and will help to guide the surface exploration route of the CE-4’s Yutu-2 rover. We also put forward some science questions to be answered by Yutu-2, to aid mission planning and scientific research.”<\/p>\n","protected":false},"excerpt":{"rendered":"
Zongcheng Ling, Le Qiao, Changqing Liu, Haijun Cao, Xiangyu Bi, Xuejin Lu, Jiang Zhang, Xiaohui Fu, Bo Li, Jianzhong Liu Planetary and Space Science Available online 10 September 2019, 104741 LINK “Highlights \u2022 Detailed spectroscopic…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[41,115,181],"tags":[5182,5183,2883,3128,1857],"_links":{"self":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/20402"}],"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=20402"}],"version-history":[{"count":1,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/20402\/revisions"}],"predecessor-version":[{"id":20403,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/20402\/revisions\/20403"}],"wp:attachment":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=20402"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=20402"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=20402"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}