Other
Scientific paper
Mar 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27.1239s&link_type=abstract
Lunar and Planetary Science, volume 27, page 1239
Other
1
Apollo 12, Cumulates, Flows: Basaltic, Gabros, Highlands: Lunar
Scientific paper
We present mineral-chemical data and petrographic observations of nine "new", texturally pristine, coarse- grained rock fragments picked from Apollo 12 soil sample 12001. A tenth sample is extremely Fe-enriched and has evidence of brecciation, possibly due to impact. The nine pristine fragments exhibit cumulate textures and are classified as gabbros, olivine gabbros, and ilmenite gabbros. Other groups have used textures (specifically coarse grain-size) and mineralogy (i.e., inverted pigeonite) as evidence for a highlands origin. Based on these criteria alone, these nine fragments would be classified as highlands rocks. However, the mineral-chemistry of these rocks is similar to basaltic fragments taken from the same soil, leading us to question whether these rocks are indeed from the highlands crust. We must proceed cautiously in designating coarse-grained rocks from mare soils as highlands rocks. Instead, many of these coarse-grained rocks may be cumulates from thick basaltic flows.
Patchen Allan
Snyder Glenn A.
Taylor Lawrence A.
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