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Clastic rocks are
composed of fragments, or
clasts, of pre-existing
minerals and rock. A
clast is a
fragment of
geological detritus, chunks, and smaller...
-
within conglomerate are
called clasts,
while the
finer sediment surrounding the
clasts is
called the matrix. The
clasts and
matrix are
typically cemented...
- gravel-size
pieces of
clayey sediment into
shale or
mudstone rip-up
clasts.
Shale rip-up
clasts are
often found at the base of
sandy turbidites, in lag deposits...
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sedimentary rocks are
composed of rock
fragments (
clasts) that have been
cemented together. The
clasts are
commonly individual grains of quartz, feldspar...
- gastroliths.
Clasts from
beaches and
streams tended to have
reflectance values of less than 35%. Less than ten
percent of
beach clasts have reflectance...
-
uplifting Catalan Coastal Ranges to the
southeast of the
basin and the
clast type is
dominated by Tri****ic
sedimentary rocks. The fan had an original...
- that
elongated clasts in
tills tend to
align with the
direction of ice flow.
Clasts in till may also show
slight imbrication, with the
clasts dipping upstream...
-
crystals that the
clasts were
built from. When the
micritisation goes on long
enough the
process can form
micritisation envelopes around the
clast, especially...
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lithic fragments.
Examples include volcanic and
metamorphic clasts,
though stable clasts such as
chert are
common in
lithic arenites. This type of rock...
-
planar fabric, or
which is incohesive,
characterised by
generally angular clasts and rock
fragments in a finer-grained
matrix of
similar composition. Tectonic...
