NYOEMPIRE

abel367502 · Posted: Thu 10:03, 24 Mar 2011 Post subject: beijing personal voyage guide

Karst cave in Beijing so there are these spatial differences, the basic controlling ingredient namely the framework and lithology. Other factors such for topography, air, vegetation, taint, nevertheless influential, yet the effect is no very obvious. The emulating focuses aboard the geological framework and rock properties from the two appearances of Beijing during the formation of karst development:
The general development of karst caves Beijing by either universal and local structural factors. The so-called structural factors refer to a whole wide scope of universal tectonic system. Beijing Xishan karst cave Baihuashan syncline developed in the wings, in the long geological history, the Western Hills and North Mountain experienced a significant ebb in either, adopted the karst caves can create thick carbonate rocks, but likewise produced a thespian orogeny, the cave in the fall or heave to the two tectonic action, access to physical and chemical properties of the erosion and collection conditions, particularly the mainly Mesozoic Yanshan tectonic action, and formed a Baihuashan - Tiaojishan - Miaofengshan syncline, to approximately 70 around the North East, the two wings sorted in the grounds of New and antique sedimentary rock sequence, which can grow as a soluble salt karst rocks, such as limestone, dolomite, dolomitic limestone, siliceous dolomite and so on.
Exposed in Beijing a aggregate place of ??2,900 square kilometers. Settlement with 1 of the Yanshan area of ??the syncline southeast wing of the most roomy karst cave roughly so Beijing southeast and northwest forward the exposed carbonate rocks with two zonal distribution pattern. Such as the noted cave in the southeast pinion of the smoke tunnel, ape-man aperture, Shihua, holes tunnel, Yin Hudong, West Cave, Fairy Cave; northwest wing away from the capital, transport facilities, yet its lack of systematic study, so it has base small cave. Tibetan currently understood Longmen Jian Jian-dong, lodged in temples,[link widoczny dla zalogowanych], public-dong Zhang, Qian Foya, etc., are very small scale. Development of local structural factors in the cave that some small-scale faults. Groundwater forward the mistake area localized corrosion, erosion and gravitational breakdown, resulting in karst caves. Cloud tunnel that takes the shape of a large north-south along the fault lines developed from a massive cave.
The lithology of the development of karst cavesDevelopment of lithology on the spatial difference of the cave a great clash. In general, the Lower Paleozoic Ordovician Beijing limestone, dolomite, due to the thickness of a large rock, pure, involving dirt, silica and flint bands less impurities, thick joints, stream outlet conditions are agreeable, likened erosion corrosion full and lusty, so the formation of the cave is not only large cave, but there are several types of chemical deposition of the outlook, such as the Shihua, Yinhu Dong, white Tallinn hole and so on. The extra impurities, the Upper Proterozoic rocks of soluble salts is not a good development of the landscape, the number of caves is in the absnece of than the sometime. The greater thickness of soluble rock, the more pure components, attach with the combined effects of additional factors, the process of cave and karst phenomena of the more intense the greater the dissolution rate, so the cave is also the most fully developed. Otherwise needy.
And a kind of karst landscape cave and causes of appreciation, this book can not be given because of space limitations introduced, but the knowledge is indeed very interesting, interested readers may hope to visit before you read someone about books.Beijing epoch of development of karst caves, generally can be divided into 6 periods:① of the cave in northern Taiwan. That about 2000 million years ago Paleogene. At this time the formation of caves, mostly remaining holes in the form preserved, more than 700 above sea level to 800 meters elevation. Reaching as the Stars as top of the mountain pinnacles on the knob Chaoyang Dong, cave 732 m above sea level; Jinshanling Great Wall in Miyun the afterward two holes, about 800 meters above sea level; Lotus Hill Township, Fangshan District historian Stone Church St. wearing a cave meters above sea level are generally this elevation.
Tang County of cave. Age approximately 600 million years antecedent approximately the Neogene. Then the crustal uplift, erosion bottom level lowering, on the surface to manner a settled planation surface, taking the class of underground caves are adult chiefly in the form of karst caves. Altitude is normally 600 to 700 meters above Fangshan Yun tunnel, historians Township Qing Jian Dong-dong-liter of soil, erosion pedestal class lowering, on the surface to fashion a settled planation surface,[link widoczny dla zalogowanych], taking the level of underground caves are adult chiefly in the form cave team. Altitude is normally 600 to 700 meters on Fangshan Yun tunnel, on the Jian Qing historian Township and West East-dong-dong, Chaoyang Dong rural Miyun fan of the card,[link widoczny dla zalogowanych], the west side of Mentougou Jietai various holes and so on.

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