The petrology and geochemistry of impact melts, granulites, and hornfelses from consortium breccia 61175The matrix and 58 clasts from breccia 61175 were analyzed for major, minor, and trace elements. The matrix is anorthositic and has lithophile trace element abundances 20 to 40 times chondrite. Clasts comprise impact melt rocks, xenocryst and xenolith-free very high aluminum (VHA) and anorthositic basalts, anorthosite, anorthosite-norite-troctolite granulites, and hornfelses. The VHA and anorthositic basalts are considered to be impact melts, and the hornfelses were probably formed by incorporation of breccias or preexisting melt rocks into a melt sheet prior to cooling. The range of melt-rock lithophile trace element abundances might indicate more than one melt sheet.
Document ID
19780057760
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Winzer, S. R. (Martin Marietta Labs. Baltimore, MD, United States)
Meyerhoff, M. (Martin Marietta Laboratories Baltimore, Md., United States)
Nava, D. F. (Martin Marietta Labs. Baltimore, MD, United States)
Schuhmann, S. (Martin Marietta Labs. Baltimore, MD, United States)
Philpotts, J. A. (NASA Goddard Space Flight Center Laboratory for Extraterrestrial Physics, Greenbelt, Md., United States)
Lindstrom, D. J. (Martin Marietta Labs. Baltimore, MD, United States)
Lum, R. K. L. (Martin Marietta Labs. Baltimore, MD, United States)
Lindstrom, M. M. (Martin Marietta Labs. Baltimore, MD, United States)
Schuhmann, P. (Maryland, University College Park, Md., United States)