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  • 1
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    Introduction to the Apollo collections: Part 2: Lunar breccias (1979)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Basic petrographic, chemical and age data for a representative suite of lunar breccias are presented for students and potential lunar sample investigators. Emphasis is on sample description and data presentation. Samples are listed, together with a classification scheme based on matrix texture and mineralogy and the nature and abundance of glass present both in the matrix and as clasts. A calculus of the classification scheme, describes the characteristic features of each of the breccia groups. The cratering process which describes the sequence of events immediately following an impact event is discussed, especially the thermal and material transport processes affecting the two major components of lunar breccias (clastic debris and fused material).
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA-CR-162559
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Petrology of impactites from Lake St. Martin structure, Manitoba (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The 23-km Lake St. Martin crater was produced 200 to 250 million years ago in Archean granitic to amphibolic gneiss, overlain by 400 to 500 m of Ordovician to Devonian limestone and dolomite. In the present paper, a schematic model of the field geology, petrology, and geochemistry is presented. The scenario is built in part on the calculations of Kieffer and Simonds and observations made on the Lake St. Martin structure.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar and Planetary Science Conference; Mar 19, 1979 - Mar 23, 1979; Houston, TX
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Thermal model for impact breccia lithification - Manicouagan and the moon (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The thermal model of Simonds (1975) is extended to the full spectrum of impact-produced rocks ranging from fragmental breccias to impact melts, with reference to the Manicouagan impact structure in Quebec. This is done by relating the basic textural features of impact-lithified rocks to variations in the mixture of superheated impact-fused material originating near the point of impact and much cooler fragmented debris originating farther from the point of impact.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar Science Conference; Mar 15, 1976 - Mar 19, 1976; Houston, TX
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Petrogenesis of melt rocks, Manicouagan impact structure, Quebec (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: It is suggested, on the basis of previous theoretical studies of shock waves, that the Manicouagan melt formed in 1 or 2 s in a 5-km-radius hemisphere near the point of impact. The melt and the less shocked debris surrounding it flowed downward and outward for a few minutes until the melt formed a lining of a 5- to 8-km deep, 15- to 22-km-radius cavity. Extremely turbulent flow thoroughly homogenized the melt and promoted the incorporation and progressive digestion of debris that had been finely fragmented (but not melted) to grain sizes of less than one mm by the passage of the shock waves. The equilibration of clasts and melt, plagioclase nucleation, and readjustment of the crater floor are discussed.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Journal of Geophysical Research; 83; June 10
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Introduction to the Apollo collections. Part 1: Lunar igneous rocks (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The basic petrographic, chemical, and age data is presented for a representative suite of igneous rocks gathered during the six Apollo missions. Tables are given for 69 samples: 32 igneous rocks and 37 impactites (breccias). A description is given of 26 basalts, four plutonic rocks, and two pyroclastic samples. The textural-mineralogic name assigned each sample is included.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA-TM-X-74633
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Apollo 14 revisited, or breccias aren't so bad after all (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A study of large Apollo 14 samples suggests that they were formed by the same processes which formed the impactites found at Apollo 16 and 17 and in terrestrial craters, especially those in crystalline targets. The abundant crystalline matrix breccias of the Apollo 14 samples generally show higher clast contents and less refractory clast populations than the clast-laden impact melts abundant at the other Apollo nonmare landing sites. The Apollo 14 characteristics are attributed to the mixing of a greater amount of cold clastic debris into the superheated melt formed during impacts. The other major lithology at Apollo 14, the vitric matrix breccias, are made in part from agglutinate-bearing soil and cannot be the protolith of crystalline matrix breccias, because of differences in structure and composition. Variations among the breccias indicate the occurrence of several impact events.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar Science Conference; Mar 14, 1977 - Mar 18, 1977; Houston, TX
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    West Clearwater, Quebec impact structure. I - Field geology, structure and bulk chemistry. II - Petrology (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A field study at the 30-km-diameter West Clearwater impact crater was carried out during the summer of 1977 to identify the nature of the flow of impact melt and less shocked debris during the excavation stage of the cratering process. The present paper investigates: (1) comparisons with other impact craters and lunar samples; (2) generation and emplacement mechanisms of impact melts and associated clastic debris; and (3) the geometry of the transient cavity and the pristine morphology of the crater.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar and Planetary Science Conference; Mar 13, 1978 - Mar 17, 1978; Houston, TX
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    Luna 24 - Lateral heterogeneity in the lunar crust (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Results of petrological investigations of Luna 24 soil samples are compared with data from Apollo and other Luna missions in order to determine the large scale composition of the lunar surface and crust. Modal analysis of the 90 to 150 micron soil fraction and electron microprobe analysis of glass spheres and fragments of the Luna 24 core sample are presented. High and low MgO mare basalt compositional clusters are found, suggesting the derivation of southern Mare Crisium basalts from two magmas. A model of Luna 24 soils as being composed of a mixture of glass-poor mare material and glass-rich highland material is found to be consistent with glass and agglutinate modal abundances. Comparisons show that potassium, and by inference all lithophile trace elements, are depleted on the eastern limb of the moon relative to the central nearside. The observed depletion is interpreted to be characteristic of the underlying crust and mantle as well as the surface.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Mare Crisium: The view from Luna 24; Conference; Dec 01, 1977 - Dec 03, 1977; Houston, TX
    Format: text
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    NASA TECHNICAL REPORTS
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