Siliciclastic rocks (commonly misspelled ''siliclastic'') are clastic
noncarbonate sedimentary rocks
that are almost exclusively silica
-bearing, either as forms of quartz
or other silicate minerals
. All siliciclastic rocks are formed by inorganic processes, or deposited through some mechanical process, such as stream deposits (delta deposits) that are subsequently lithified
. They are sandstone
based rocks accounting for about 50 - 60% of the world oil and gas exploration. The other silicate minerals that are generally present in siliciclastic sedimentary rocks are feldspar
Siliciclastic sediments are silica-based sediments, lacking carbon compounds, which are formed from pre-existing rocks, by breakage, transportation and redeposition to form sedimentary rock.
[Oilfield Glossary: siliciclastic sediment.]
Retrieved 23 August 2018.