Rock 67015 - A feldspathic fragmental breccia with KREEP-rich melt clastsThe feldspathic fragmental breccia (FFB) 67015, from the rim of North Ray Crater, contains a wider range of clast lithologies than have previously been described for FFBs. The present petrological and chemical study reveals two components of major importance: a dark, vesicular, KREEP-rich melt rock of very high alumina basalt composition common at the Apollo 16 site, and a large clast of medium-grained ferroan anorthositic norite which composition falls among the most magnesian members of the ferroan anorthosite suite of pristine cumulate rocks. This latter material constitutes a previously missing member of certain mixing models, which were designed to account for the North Ray Crater melt rocks and bulk breccias.
Document ID
19830040081
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Marvin, U. B. (Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Lindstrom, M. M. (Washington University St. Louis, MO, United States)