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  • 1980-1984  (14)
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  • 1
    Electronic Resource
    Electronic Resource
    Beginning and end of lunar mare volcanism (1983)
    [s.l.] : Nature Publishing Group
    Nature 302 (1983), S. 233-236 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Direct evidence for the existence of ancient lunar volcanism is found in a variety of sample investigations. Numerous mare basalt fragments are found as clasts in breccias that were assembled before 3,900 Myr BP (refs 14, 15). Many of these breccias appear to be related to major basins, ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/302233a0
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    Paper (German National Licenses)
    Fulltext
  • 2
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    Beginning and end of lunar mare volcanism (1983)
    Springer Nature
    Details
    Publication Date: 1983-03-01
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Springer Nature
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    PAPER CURRENT
  • 3
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    Mercury: New identification of ancient multi-ring basins and implications for geologic evolution (1984)
    In:  CASI
    Details
    Publication Date: 2006-04-06
    Description: A systematic survey of the entire Mariner 10 coverage of Mercury was performed to determine the number, distribution and dimensions of additional ancient basins on the planet. Ancient multi-ringed basins on Mercury can be recognized by the following criteria: (1) arcs of massif chains and isolated massifs that protrude through younger units, (2) arcuate segments of lobate ridges (rupes) that align with massifs in circular patterns, (3) arcuate scarps that are aligned with ridges and massif, and (4) isolated regions of anomalously high topography within the intercrater regions of heavily cratered terrain. All of the newly identified basins predate the mercurian intercrater plains, previously held to be the oldest geologic unit on the planet. Subsequent structural evolution of various regions was influenced by the presence of these basins. Smooth plains units appear to be more extensive than mapped by Mariner 10 and more than 90 percent of them appear to be basin contained or basin related. The concentration of extensive smooth plains material within and associated with basin structural and depositional environments suggests a volcanic origin for most of this unit, analogous to the lunar maria. Basins appear to provide the basic structural pattern of early terrestrial planetary crusts.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA. Washington Rept. of Planetary Geol. Program, 1983; p 87-89
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Ring spacing of Mercurian multi-ring basins and basin ring formation (1984)
    In:  CASI
    Details
    Publication Date: 2006-04-06
    Description: Recent systematic mapping of Mercury has revealed many ancient and previously unrecognized multiring basins. The population of these basins now stands at 20, possibly is as large as 25, and includes at least 76 measurable rings. From the new data base, we present some systematics of basin ring spacing on Mercury, compare them with similar data for the Moon, and draw some preliminary conclusions on conditions of ring formation for basins on the terrestrial planets.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA. Washington Rept. of the Planetary Geol. Program, 1983; p 90-92
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Volcanism on Mars (1981)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: In situ chemical analyses of Martian soil by the Viking lander indicate mafic to ultramafic source rocks, consistent with both remote sensing data indicating the presence of pyroxene and olivine and with petrologic modeling which suggests that Martian lavas are iron-rich and ultramafic. Photogeological analysis of the Martian surface reveals two types of volcanic morphology: (1) central volcanoes, developed by continued and prolonged eruption from a point source vent; and (2) volcanic plains, recognized by mare ridges and flow lobes. When these volcanic morphologies are combined with relative age data, a volcanic history may be derived that is consistent with a moonlike thermal history involving a lithosphere of increasing thickness with time which gradually suppresses the volcanism.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Reviews of Geophysics and Space Physics; 19; Feb. 198
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Composition of Orientale basin deposits and implications for the lunar basin-forming process (1984)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The geologic, spectral and geochemical characteristics of the lunar Orientale basin are discussed, and a model is defined for the generation of Orientale basin deposits. The data indicate that the basin ejecta is composed mainly of anorthositic deposits and no crustal material. The crater was originally 500-600 km across and 50-60 km deep, the latter being too shallow to reach the projected 100 km crustal depth. A proportional growth model is judged acceptable for the Orientale basin. Finally, it is concluded that neither the Apollo 14 nor 16 missions obtained Orientale ejecta material, which could in any case be unidentifiable until more thorough samplings are made of a large portion of the lunar surface.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Journal of Geophysical Research, Supplement (ISSN 0148-0227); 89; C197-C21
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    NASA TECHNICAL REPORTS
  • 7
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    Apollo 16 site geology and impact melts - Implications for the geologic history of the lunar highlands (1984)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The geology of the Apollo 16 site is reconsidered on the basis of data from photogeology, geochemical remote sensing, and lunar samples. The site possesses an upper surface of anorthositic gabbro and related rocks. Mafic components were deposited as basin ejecta. The events involved in its geological evolution were the Nectaris impact and the Imbrium impact. The role of large, local craters in the history of the region was to serve as topographic depressions to accumulate basin ejecta. The most abundant melt composition at Apollo 16 is an aluminous variety of LKFM basalt supplied by the Nectaris impact as ejected basin impact melt. The mafic LKFM melt may have been supplied by the Imbrium impact. More aluminous melt groups are probably derived from local, small craters. The remainder of the deposits in the region are composed of anorthositic clastic debris derived from the Nectaris basin, the local crustal substrate, and Imbrium and other basins.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Journal of Geophysical Research, Supplement (ISSN 0148-0227); 89; C95-C107
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    Spectral reflectance studies on the orientale region of the Moon (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-01-25
    Description: The Orientale impact occurred in rugged highlands on the southwestern limb of the Moon and was the last of the major basin-forming events. Valuable insight concerning lateral and vertical changes in the composition of the lunar crust can be provided by studies of material exposed by lunar impact basins. These impacts have excavated material from a variety of depths and deposited this ejecta in a systematic manner. In order to investigate the composition of materials exposed on the interior of Orientale basin, near-infrared reflectance spectra were collected for units within the Cordillera ring.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar and Planetary Institute The 47th Ann. Meteoritical Soc. Meeting; 1 p
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    NASA TECHNICAL REPORTS
  • 9
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    Beginning and end of lunar mare volcanism (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The distribution and characteristics of the early phases of mare vulcanism on the moon are discussed. Breccias have been observed that indicate the presence of magma flows before 3900 Myr BP. A mafic feature has been identified in more than 100 craters at least 1 km across. The absence of buried mare surfaces on the nearside and western hemispheres is attributed to ejecta deposits, and farside basins with no mare fill are suggested to have experienced early mare flooding. Photographs of the bright-rayed Lichtenberg crater have revealed that mare volcanism occurred within the time frame 1700-2000 Myr BP. It is concluded that the moon featured two periods of igneous activity, the last happening at 1000 Myr BP, and beginning 4300 BP.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Nature; 302; Mar. 17
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    Chemical mixing model studies of lunar orbital geochemical data: Apollo 16 and 17 highlands compositions (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: HIG-CONTRIB-1331-VOL-2 , Hawaii Univ. Contrib. of the Hawaii Inst. of Geophys., Vol. 2; 9 p
    Format: text
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    NASA TECHNICAL REPORTS
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