What are the components of sandstone?
Quartz is the main mineral of clastic sandstone, its under surface conditions is the most stable, most of the main group of sandstone, commonly used as indicator of parent rock. After the quartz feldspar sandstone, some more than quartz. Generally, the content of detrital feldspar is affected by climate, crustal movement and rock strength properties. Cuttings are direct signs. Determine the parent rock in sandstone is mostly sedimentary metamorphic rock debris volcano debris and debris or fine particles, composition is relatively stable. The proportion of sandstone is greater than 2.87 a mineral known as heavy minerals, its content is generally less than 1%. According to the typomorphic characteristics of heavy minerals and heavy mineral assemblages (combined with light mineral assemblages, stratigraphic correlation) on the recovery of the parent rock type, and trace terrigenous region are meaningful. Fillings
The sedimentary and metamorphic lithic debris more stable. The proportion of more than 2.87 sandstone in a mineral known as heavy minerals, its content is generally less than 1%. according to the typomorphic characteristics of heavy minerals and heavy mineral assemblages (combined with light mineral assemblages, stratigraphic correlation) on the recovery of rock types, and terrestrial areas are traced. Meaningful. Fillings include chemical cements and fillings. Clastic dominated cementation is siliceous and carbonate siliceous cements. Generally the overgrowth of quartz, rare for chalcedony and opal. In carbonate cementation by calcite dolomite and siderite are common, in a relatively rare. The ancient sandstone in siliceous cement are common, but the younger and later Mesozoic sandstone, often with carbonate cements for more. Generally, this is due to the different stability of two kinds of cements, or carbonate cementing material Easily caused by leaching
The chemical composition of sandstone is very large, and it is determined by the composition of clastic and interstitial materials. The chemical composition of sandstone is mainly SiO2 and Al2O3, and the SiO2/Al2O3 ratio is a sign of maturity and immature sandstone
