1048 - Lunar and Planetary Institute (LPI) For example, superposition of Imbrium ejecta onto Geminus glacis, not recognized in [4], confirms Geminus to be post-Imbrian in age In addition, south-east-trending radial valleys ~60 km east of Burckhardt A (~31 oN, 63 oE) onto terrain mapped as Imbrium plains units [3] suggests this terrain may instead be Nectarian in age
2752. PDF - lpi. usra. edu 2752 pdf MARS NORTH POLAR LAYERED DEPOSIT STRATIGRAPHY NEAR GEMINI LINGULA FROM HIRISE IMAGERY AND DTMS P S Russell1, S Byrne2, S Mattson2, S Christian3, J W
1721. PDF - lpi. usra. edu 1721 pdf NORTHERN POLAR LAYERED DEPOSITS, MARS: STRUCTURAL RELATIONSHIPS BETWEEN GEMINA LINGULA, THE MAIN LOBE AND CHASMA BOREALE FROM SHARAD RADAR STRA-TIGRAPHY J W Holt1 and A Safaeinili2; 1University of Texas Institute for Geophysics, Jackson School of Geo-sciences, University of Texas, Austin, TX 78758 (jack@ig utexas edu); 2Jet Propulsion Laboratory, Caltech, Pasa-dena, CA 91109
PowerPoint Presentation a “grab sample” of rocks and regolith can address and solve scientific issues Example: youngest mare lava flow, impact melt floor of fresh crater, regional pyroclastics
System - Lunar and Planetary Institute (LPI) A series of low albedo deposits of varying distribution and areal extent have been mapped on the lunar surface1 The deposits are characterized by their low albedo relative t o other lunar geologic units, their post-Imbrium event but pre-latest mare age, their concentration i n and near upland areas adjacent t o maria, and their apparent smooth surface which gives the appear- ance of mantling
1365. PDF - Lunar and Planetary Institute (LPI) The age of the Serenitatis basin has been of concern to lunar students for many years Initial studies, noting its old and degraded appearance, proposed that it was one of the very oldest basins on the Moon; relative chronologies placed it well back in pre-Imbrian time [e g , 1-4] Study of the Apollo 17 highland samples and the assumption that such rocks are fragments of ejecta from the
2677. PDF - Lunar and Planetary Institute (LPI) 2677 pdf MORPHOLOGY OF GRUITHUISEN AND HORTENSIUS DOMES: MARE VS NONMARE VOLCAN-ISM S E Braden1, 2, M S Robinson1, T Tran1, H Gengl1, S J Lawrence1, B R
1461. PDF - lpi. usra. edu On the basis of Apollo gamma-ray results, [1] sug-gested that relatively high concentrations of Th near the Imbrium antipode in the South Pole-Aitken (SPA) basin might represent Imbrium ejecta, a consequence of convergence of Th-rich material ejected by the Imbrium impact that occurred in the Th-rich Procel-larum KREEP Terrane (PKT; [2]) Taking into ac-count the high orbits and long travel
BY - Lunar and Planetary Institute (LPI) a f t e r the formation of Mare Crisium; and Stage I11 c r a t e r s formed a f t e r the emplacement of mare basal t s
SEARCHING FOR CRISIUM BASIN EJECTA: CHEMISTRY AGES OF LUNA IMPACT MELTS . . . The Crisium basin predates the Imbrium basin (3 85 Ga) and possibly the Serenitatis (3 87 Ga) basin [7]; the age of our Group 2 melt sample F (3 72 Ga) precludes a Crisium basin origin Group 2 likely represents the melt sheet of a post-basin crater somewhere in the vicinity of the Luna 20 site Group 3 has a chemical composition and an age indistinguishable from those of the impact melts of