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  • 1
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    Origin and Emplacement of the Ultramafic Rocks of the Emigrant Gap area, California (1971)
    Oxford University Press
    Details
    Publication Date: 1971-10-01
    Print ISSN: 0022-3530
    Electronic ISSN: 1460-2415
    Topics: Geosciences
    Published by Oxford University Press
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    PAPER CURRENT
  • 2
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    The ancient lunar crust, Apollo 17 region (1992)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: The Apollo 17 highland collection is dominated by fragment-laden melt rocks, generally thought to represent impact melt from the Serenitatis basin-forming impact. Fortunately for our understanding of the lunar crust, the melt rocks contain unmelted clasts of preexisting rocks. Similar ancient rocks are also found in the regolith; most are probably clasts eroded out of melt rocks. The ancient rocks can be divided into groups by age, composition, and history. Oldest are plutonic igneous rocks, representing the magmatic components of the ancient crust. The younger are granulitic breccias, which are thoroughly recrystallized rocks of diverse parentages. The youngest are KREEPy basalts and felsites, products of relatively evolved magmas. Some characteristics of each group are given.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar Science Inst., Workshop on Geology of the Apollo 17 Landing Site; p 17-20
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Lunar highlands breccias generated by major impacts (1977)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The processes that may have been involved in the formation of most of the major types of lunar breccias are discussed. Some of the types of highlands breccias that may have originated in large impacts are identified.
    Keywords: ASTROPHYSICS
    Type: NASA, Washington The Soviet-Am. Conf. on Cosmochem. of the Moon and Planets, Pt 2; p 637-658
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Petrology and geochemistry of lunar dimict breccia 61015 (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The results of a petrological and geochemical study of the dimict breccia 61015 at the Apollo 16 site are presented and discussed. The breccia consists predominantly of granulated anorthosite and impact melt rock of very high aluminum-basalt composition. It probably formed in the floor of an expanding crater cavity when impact melt generated within the cavity was injected into underlying anorthositic bedrock and solidified rapidly, the anorthosite and melt rock being fragmented by deformation in the later stages of the impact. A possible source crater for the breccia is identified. The breccia has been affected by at least one recent small impact, which produced internal shock-induced melting of the breccia and injected and coated the rock with externally derived melts. The TiO2 content of the coating and vein glasses establish that they cannot be melted soils; their composition requires a mafic, low-TiO2 protolith component.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Journal of Geophysical Research, Supplement (ISSN 0148-0227); 89; C63-C86
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Lunar anorthosite 15415 - Texture, mineralogy, and metamorphic history. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Lunar anorthosite 15415 consists almost entirely of anorthite (homogeneous anorthite 96.6 molecule percent), with accessory diopsidic augite and traces of hypersthene, ilmenite, and a silica mineral. The rock has had a complex metamorphic history. The texture reflects at least two episodes of shearing (followed by intense and partial recrystallization, respectively), one episode of cataclastic deformation, and one or more episodes of shattering and fragmentation.
    Keywords: SPACE SCIENCES
    Type: Science; 175; Jan. 28
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Apollo 11 and 12 mare basalts and gabbros - Classification, compositional variations, and possible petrogenetic relations. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Keywords: SPACE SCIENCES
    Type: Geological Society of America Bulletin; 83; Aug. 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Armalcolite - A new mineral from the Apollo 11 samples (1970)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Apollo 11 magnesium-rich opaque oxide armalcolite mineral from Tranquility Base noting relation to pseudobrookite series
    Keywords: SPACE SCIENCES
    Type: APOLLO 11 LUNAR SCIENCE CONFERENCE; Jan 05, 1970 - Jan 08, 1970; HOUSTON, TX
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    Petrologic and age relations of the Apollo 16 rocks - Implications for subsurface geology and the age of the Nectaris basin (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: In connection with its proximity to the Nectaris basin, the Apollo 16 site is the prime lunar sampling site for dating the Nectaris impact. It is found that the Ar-40/Ar-39 data set upper limits on the time of formation of the major types of breccia at the Apollo 16 site. These are 3.92 b.y. for the feldspathic fragmental breccias, and 3.92 b.y. for the dimict breccias. The data establish that the major subsurface units at the site were deposited no longer than 3.92 b.y. ago. Recent developments indicate that the bulk of the material at the site probably has Nectarian or pre-Nectarian ages. An age of 3.9 b.y. must be a rough upper limit to the age of the Nectaris impact. This limit must be verified by additional studies.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar and Planetary Science Conference; Mar 16, 1981 - Mar 20, 1981; Houston, TX
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    A reexamination of the RB-SR isotopic systematics of lunar breccia 12013 (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Lunar breccia 12013 is one of the few rocks for which isotopic evidence has been interpreted as indicating a 4.5-AE age, and it is the only lunar rock which contains abundant granitic material that may date back to the initial lunar differentiation. An investigation of 12013 conducted by Quick et al. (1981) has led to the conclusion that 12013 is an extremely complex mixture of impact-generated melt and clastic components of uncertain affinities. It was found that the granitic component in 12013 need not be any older than 4.16-4.17 AE. In the present study a model is presented for the Rb-Sr evolution of 12013 which explains the isotopic data without resorting to a 4.5-AE age for any component. Attention is given to petrographic constraints, isotopic investigations, and an evaluation of the Rb-Sr isotopic data. It is concluded that lunar rock 12013 is an extremely complex polymict breccia in which the Rb-Sr isotopic systematics have been greatly influenced by mixing during breccia formation and by subsequent reequilibration.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar and Planetary Science Conference; Mar 16, 1981 - Mar 20, 1981; Houston, TX
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    Petrology and petrogenesis of lunar breccia 12013 (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Sample 12013 is extremely rich in incompatible elements (K, P, U, Th, Pb, Ba, Rb, Zr, Nb, and rare earths) relative to other lunar samples, and it contains abundant granitic material composed of silica minerals and K-feldspar. The present investigation provides detailed petrologic and mineralogic descriptions of the rock and a discussion of its genesis and history. The sample is made up of two lithologies, including a mottled gray and white lithology, and a black lithology. A detailed petrology of the gray breccia is presented, taking into account lithic clasts, mineral clasts, deformation textures in clasts, the matrix, and felsite. A detailed petrology of the black breccia is also provided. Attention is given to a model for the formation of the breccia, an evaluation of the possible genetic relationships between the various components, and some constraints on the nature of the source area.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar and Planetary Science Conference; Mar 16, 1981 - Mar 20, 1981; Houston, TX
    Format: text
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    NASA TECHNICAL REPORTS
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