The olivine at the lunar crater Copernicus as seen by Clementine NIR data

Research areas:
Year:
2001
Authors:
Journal:
PLANETARY AND SPACE SCIENCE
Volume:
49
Number:
1
Pages:
65-70
Month:
January
ISSN:
0032-0633
BibTex:
Abstract:
We have reduced Clementine near infrared (NIR) data in order to
investigate the distribution of olivine in the crater Copernicus.
Copernicus represents a good test area for the detection of olivine-rich
areas with Clementine data as olivine was unambiguously detected in the
central peaks from previous Earth-based spectroscopic observations.
Clementine provides a better spatial resolution(similar to 200 m/pixel)
than Earth-based telescopic observations, which are limited by the
atmospheric turbulence. This resolution is helpful to clarify the
relationship between different lithologies and to detect heterogeneities
at small scales. NIR filters at 1100, 1250, 1500, and 2000 nm are
particularly useful to discriminate between olivine and pyroxene within
the mafic minerals identified with Clementine UVVIS channels. Band
ratios are presented to show the distribution of olivine-rich areas,
which are detected mostly in the central peak complex. Three small areas
in the northern walls are also consistent with olivine-rich materials,
in agreement with previous studies. Nine-channels Clementine spectra
confirm the overall heterogeneity of the crater site. This demonstrates
the great potential of Clementine NIR data when integrated with UVVIS
data for the detection of olivine dominated areas on the Moon. (C) 2001
Elsevier Science Ltd. All rights reserved.