Other
Scientific paper
Mar 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27.1121r&link_type=abstract
Lunar and Planetary Science, volume 27, page 1121
Other
2
Aphanite, Impact Melt, Poikilitic, Serenitatis, Taurus-Littrow
Scientific paper
Impact melt rocks dominate the samples collected from the lower slopes of the massifs bordering the Taurus-Littrow Valley during the the Apollo 17 landing mission. A large number of them, most of which have poikilitic groundmasses, form a reasonably tight chemical cluster and they have been virtually unanimously interpreted as melt created in the Serenitatis event itself. A large number of samples from the South Massif have aphanitic textures and are more clast-rich; they form a more chemically disperse and distinct group. Several authors have suggested that these samples were also produced during the Serenitatis impact. However, the mineral clast populations and the chemical trends within these groups differ and there is a hiatus between them. Further, multiple analyses of individual aphanitic rocks show that there are quite distinct compositions among them. Thus the only evidence to suggest that they are from the same event is that they are from the same landing site, which I suggest is barely an argument. Most likely, the aphanites represent a number of smaller impacts around the landing site after the Serenitatis event. Other impact melts distinct from each other and from both the poikilitic and aphanitic groups attest to the history of impacting in the region over a fairly restricted time range.
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