Structural interpretation of timely sandstone

Many people have been to Zhangjiajie. Zhangjiajie has two famous scenic spots, one is Huanglong Cave and the other is Jiutian Cave, both of which are very beautiful and spectacular cave landscapes. These landscapes can only be presented to tourists after thousands of years of crustal movement. While enjoying the beautiful scenery, we can also learn a little scientific knowledge. Today, the rabbit will introduce the structure of the timely sandstone that constitutes this landscape!

Timing sandstone: sandstone in sedimentary clastic rocks, one of silica (timing sandstone, quartzite, quartz sand and timing vein). Belonging to glass and metallurgical auxiliary raw material minerals. There are mainly three strata: the top of Xujiahe Formation of Upper Triassic, the bottom of Zhenzhuchong Formation of Lower Jurassic and Ziliujing Formation of Middle and Lower Jurassic.

The strata that make up the sandstone peak forest are Yuntaiguan Formation of Middle Devonian and Huangjiadian Formation of Upper Devonian. The lithology is extremely thick or thick quartzite sandstone mixed with thin siltstone. Its timely content is as high as 90%, and its cements are mostly iron and silicon. The chemical properties of the iron silica gel complex are very stable in the supergene environment and have strong corrosion resistance. On the other hand, because of its hard substance, the thick purple sandstone (oolitic iron ore layer) cemented by iron at the top of the Huangjiadeng Formation constitutes the top cover of the mountain, just like putting a solid helmet on the peak column, forming a veritable "iron hat".

Sandstone is formed by timely particles (sand), and its structure is stable, usually light brown or red, mainly containing silicon, calcium, clay and iron oxide. Sandstone is a kind of sedimentary rock, which is mainly cemented by sand particles, and the content of sand particles is above 50%. Most sandstones are composed of quartz or feldspar. Main ingredients A. Timely ingredients? More than 52%; B. Clay is about15%; C. goethite is about18%; D other substances exceeding 10%.

Sandstone is formed by weathering, denudation and transportation of source rocks in the basin. Rock consists of debris and interstitial materials. Common clastic minerals: quartz, feldspar, muscovite, calcite, clay minerals, dolomite, oolitic chlorite, chlorite, etc. The filler consists of two components: cement and macadam matrix. Common cements include siliceous cements and carbonate cements; Heterobase composition mainly refers to clay or silty material with fine particles deposited at the same time as debris. The composition and structure of interstitial materials reflect the geological tectonic environment and physical and chemical conditions of sandstone formation. Sandstone can be divided into timely sandstone, feldspathic sandstone and lithic sandstone according to its sedimentary environment. Sandstone and sandstone constitute the main reservoirs of oil, natural gas and groundwater. Sand and sandstone can be used as abrasives, glass raw materials and building materials. Sandstone and sandstone have certain occurrence and are rich in placer gold, zircon, diamond, ilmenite and rutile.

We often appreciate the wonders of nature and such magnificent scenery. Rabbit warmly reminds everyone that while visiting these beautiful scenery, you can also learn some geographical knowledge and expand your knowledge. Friends who have never been to Zhangjiajie must go and see it when they have time! These scenic spots not only have high tourism value, but also have high scientific research value! Ok, rabbit continues to look for popular science knowledge for everyone!

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