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→Characterisics Of Major Classes Sandstones
The kind of sandstones was classified by Pettijohn, 1975. This classification based on the main component of sandstone. Most sandstones are made up of mixtures o a very small number of dominant framework components, like [[quartz]], feldspars, and rock fragments are commonly abundant enough to be important in sandstone classification.
The kind of sandstones was classified by Pettijohn, 1975. This classification based on the main component of sandstone. Most sandstones are made up of mixtures o a very small number of dominant framework components, like [[quartz]], feldspars, and rock fragments are commonly abundant enough to be important in sandstone classification.
===[[Quartz]] Arenites===
===Quartz Arenites===
Quartz arenites are composed of more than 90 percent of siliceous grains (quartz, [[chert]], other quartzose rocks fragments), generally well lithified and well cemented and cemented with silica or carbonate cement. It’s associated in stable cratonic environments such as eolian, beach and shelf environments. Fossil preservation is poor, but trace fossils such as burrows of the skoltihos facies which occurring in intertidal zones may be abundant in some shallow marine quartz arenites. Quartz arenites are first-cycle deposits derived from primary crystalline or metamorphic rocks which had a weathering process. Quartz arenites are common in the geologic record one-third of all sandstones and commonly white or light, may be stained red, pink, yellow and brown by iron oxides.
Quartz arenites are composed of more than 90 percent of siliceous grains (quartz, [[chert]], other quartzose rocks fragments), generally well lithified and well cemented and cemented with silica or carbonate cement. It’s associated in stable cratonic environments such as eolian, beach and shelf environments. Fossil preservation is poor, but trace fossils such as burrows of the skoltihos facies which occurring in intertidal zones may be abundant in some shallow marine quartz arenites. Quartz arenites are first-cycle deposits derived from primary crystalline or metamorphic rocks which had a weathering process. Quartz arenites are common in the geologic record one-third of all sandstones and commonly white or light, may be stained red, pink, yellow and brown by iron oxides.