Classification and application of sandstone
: lithic sandstone with quartz and sandstone. Detritus mainly lithic sandstone in cuttings of diverse components, the mother rocks vary. Common plagioclase feldspar, with potassium feldspar, also can appear unstable mafic lithic sandstone. The deeper the color, gray, gray green, gray, light color debris is rare. Sandstone formed near the tectonic uplift gouxian belt or depression basin, by the parent rock rapid erosional and rapid accumulation. Lithic sandstone can be terrestrial or marine.
According to the sandstone matrix content is divided into two categories, namely, net less than 15% of the sandstone matrix and the matrix content is more than 15%. The two greywacke further subdivision available triangular diagram, detrital material group three endmember represents is divided into: Q (quartz), F (Chang Shi) end end element and R (Yan Xie) endmembers. According to various components will be divided into 1 different sandstone quartz sandstone; 2 Chang Shi Yan Xie 3 quartz sandstone; quartz sandstone; 4 Chang Shi sandstone; 5 Yan Xie Chang Shi Chang Shi Yan Xie 6 sandstone; sandstones; 7 Yan Xie sandstone.
Sand is a kind of granular material, mineral and rock debris is its sedimentary components. Scientists will usually be divided into coarse sand particle size: 2 - 0.5mm; in the sand: diameter 0.5 - 0.25mm; fine sand particle size: 0.25 0.0625mm. formed by such sand rock is sandstone.
Graywacke: poor sorting, mud and sand mixed with quartz sandstone, generally less, and mostly edges. With different proportion of feldspar and lithic feldspar, often containing a small amount of mica. Mainly plagioclase, lithic. Rich matrix is a basic feature of greywacke, the finer particles, the higher the content of matrix. Matrix components in chlorite and hydromica. Common greywacke formation conditions and lithic feldspar sandstone or similar, namely rapid erosion, transportation and deposition of the formation, but the greywacke can be formed under different climatic conditions. Greywacke typical often accumulate in rapid subsidence or turbidite flysch type construction.
Quartz sandstone: more than 90% single crystal quartz detrital material, there are a few flint and siliceous debris. Heavy minerals rarely. Often siliceous cementation, overgrowth cementation phenomenon. Quartz sandstone enrichment in quartz, tectonic stability, terrain undulating, warm and humid climate conditions, by quartz rich rocks (granite, granite gneiss, metamorphic quartzite etc.), strong chemical weathering, and after a long distance transport and deposition in the coastal area of shallow water or into. Feldspar sandstone is mainly composed of detrital quartz and feldspars, some feldspar content can be very high. The feldspar sandstone is feldspar orthoclase, plagioclase and microcline acid color. Usually red or yellow. Its formation depends largely on the composition of parent rocks, must first have the feldspar rich rocks, such as granite, granite and gneiss. In addition to the favorable tectonic, In the area with strong tectonic movement, the topography is also large, the granite basement uplift is strongly eroded, and the erosion products are rapidly accumulated, and the formation of a thick feldspar sandstone
