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International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part B7. Istanbul 2004
sandstone and clays, Cenomanian and Turonian clay,
sandstones, gravelites, conglomerates and a predominantly fine
to medium grained sediments comprising of shale, clays and
sandstone of Santonian to Maestrichtian in age. The Paleogene
section consists of red, red brown clay at the top with Eocene
overlain by the Oligocene sandstone, clays and shale. Both
Cretaceous and Tertiary strata dip few degrees from the centre
to the edge of the basin. The, Jurassic sedimentary formations
exposed in the northeastern edge of the basin, is bounded by
young active faults.
Field observation supported by interpretations conducted on
Landsat TM and ASTER (mosaics) images reveal the fault
systems within the Shargyn Basin (Figs.lb and 2) to show
characteristic thrusting and reverse faulting.
F 1
The thrust faults surround the basin, which has overall a
parallelogram shaped geometry, approximately 25 km in a
north-south direction and 60 km east west. The thrust faulting is
attesting general shortening, characterized by sharp sandy hills,
and questa's in the Quaternary alluvial apron deposits (Fig. 2).
Occasionally the faulted sandy hills show small springs and
bushy vegetation. Field observation shows the thrust faults to
have developed along the foot of the questa's or terraces. The
average height of these fault terraces is approximately 5 m,
sometimes with gentle slope. Togtoh et. al., (1994) relate these
terrace and questas to just erosional and abrasional process of
the Shargyn Tsagaan Lake. Still other researchers believe these
morphological events to be indicative of
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