Survey of lunar plutonic and granulitic lithic fragmentsA catalog of lunar plutonic rocks and granulitic impactites belonging to the ANT suite has been compiled. The coarser-grained, plutonic rocks in the compilation are probably pristine; they belong to two groups, Mg-rich plutonic rocks and anorthosites, with a preponderance of the latter type. The granulitic impactites, however, have bulk and mineral compositions that fall between the two groups defined by the pristine nonmare samples of Warren and Wasson (1977). Thus the granulitic impactites may have originated by metamorphism of mixed impactites in early breccia sheets. The catalog, representative of the lunar crust before the end of heavy bombardment, suggests a crust with over 78 vol. % plagioclase and about equal proportions of material with noritic and troctolitic affinity.
Document ID
19790055123
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Bickel, C. E. (San Francisco State University San Francisco, Calif., United States)
Warner, J. L. (NASA Johnson Space Center Houston, Tex., United States)