Transcript Document 481300

HRSC mosaic with HRSC nadir & color images and HRSC
DTM height contour lines (every 100 m)
Oyama layered deposits
Long/lat: from 340.00E, 24.00N to 340.50E,
23.20N
Rational: Clays have been transported onto the
floor of Oyama and deposited as layers. Liquid
water may have been involved and the small
valleys on Oyama flanks may be related to this
transport. Flows have also formed valleys after
the deposition of these layers.
These rocks have likely recorded a long and
complex presence of liquid water.
A fresh crater closer to the ellipse has likely
exhumed these rocks.
Morphology & mineralogy: A large part of the
eastern half of Oyama (split in two halfs by a
scarp) shows light-toned thin layers, through
which erosion formed valleys. Most of the
layered rocks are Fe/Mg-smectite bearing, but
weak signature of Al-phyllosilicates are
detected at the top of the stratigraphy, similarly
to the plateau’s layers, but with a much thinner
top Al-phyllosilicate unit.
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MSL tasks: At large scale, study the layering of
the outcrop, its fracturation, the eroding
valleys, possibly its relation to the plateau’s
layers at the transition from crater flanks to
floor. At small scale, the grain structure, the
mineralogy and chemistry of the different
compositional sub-units, and within each unit
between layers.
10 km
HRSC mosaic with HRSC color images
495 The best eroded, exhumed part of these rocks
1 km
J m-2 K-1 s-1/2
80
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HRSC mosaic with THEMIS thermal inertia (Fergason, R. L.)
have relatively high thermal inertia.
Other dark, high thermal inertia rocks, possibly
of volcanic origin, have filled the western half
of the crater and the lowest parts of the
valleys.
The entire light-tone rocks are finely layered (thickness of the order of one meter), and fractured in the same
way as the plateau’s layered rocks.
1 km
HiRISE image 17962_2035
200 m
HiRISE image 17962_2035