A comparative study on the mineralogy, chemistry and chronology of the Apollo 16 crystalline impact melt breccias. Part II: Chronology.

Reimold, W.U., Bansal, B.M., Wiesman, H., Wooden, J.L., Mackinnon, Ian D.R., & Nyquist, L.E. (1982) A comparative study on the mineralogy, chemistry and chronology of the Apollo 16 crystalline impact melt breccias. Part II: Chronology. In Lunar and Planetary Science Conference, Lunar and Planetary Institute, Houston Texas, USA, pp. 644-645.

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The controversy on how to interpret the ages of lunar highland breccias has recently been discussed by James [1]. Are the measured ages testimony of true events in lunar history; do they represent the age of the ancient crustal rocks, mixed ages of unequilibrated matrix-phenocryst relationships, or merely thermal events subsequent to the formational event ? It is certain from analyses of terrestrial impact melt breccias that the melt matrix of whole impact melt sheets is isotopically equilibrated due to the extensive mixing process of the early cratering stage [2,3]. It has been shown that isotopic equilibration takes place between impact melt matrix and target rock clasts therein, with the intensity of isotopic exchange depending on the degree of shock metamorphism, thermal metamorphism and the size of the clasts [4]. Therefore, impact melt breccias - if they are relatively clast-poor and mineralogically well studied - can be considered to be the most reliable source for information on the impact history of the lunar highland.

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ID Code: 58957
Item Type: Conference Paper
Refereed: Yes
Keywords: Apollo 16 breccias, impact melt breccias, isotopic analyses, lunar highlands samples, mineralogy
Subjects: Australian and New Zealand Standard Research Classification > EARTH SCIENCES (040000) > GEOLOGY (040300) > Extraterrestrial Geology (040302)
Divisions: Current > Institutes > Institute for Future Environments
Copyright Owner: Copyright 1982 Lunar and Planetary Institute.
Deposited On: 08 Apr 2013 22:58
Last Modified: 08 Apr 2013 23:14

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