Small-Scale Compositional Heterogeneity of Impact Melts

Details Small-Scale Compositional Heterogeneity of Impact Melts Small-Scale Compositional Heterogeneity of Impact Melts

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27.1169s&link_type=abstract

Lunar and Planetary Science, volume 27, page 1169

Computer Science

Heterogeneity, Impact Melt, Ries, Schlieren, Wabar

Scientific paper

We are in the process of bringing a Cameca SX-100 Scanning Electron Microprobe on-line which simultaneously employs five separate, wave-length dispersive X-Ray spectrometers and a fully automated X/Y translation sample holder / stage. Such an instrument permits rapid acquisition of hundreds of analyses which--after digitization and diverse image enhancement procedures, including contrast-stretching among 256 gray tones--can be displayed as two-dimensional maps of the relative and absolute concentration of the five elements acquired per individual scan. This capability is ideally suited to evaluate the compositional nature of individual schlieren characteristic of impact melts, thereby expanding on previous work that employed select spot-analyses methods. How do individual schlieren relate to the bulk-composition of impact melts? What are their precursors? What can be gleamed about the general process of melt-homogenization during impact?

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