Physical And Chemical Weathering Of Granite

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Physical and chemical weathering of granite. 5 2 chemical weathering chemical weathering results from chemical changes to minerals that become unstable when they are exposed to surface conditions. Ions dissolved in rainwater and soil water mineral fragments and granite fragments clays and iron oxides all of these. Water causes both mechanical weathering and chemical weathering. Some minerals like quartz are.

Hydrolysis is the chemical weathering of minerals by a mildly acidic water that forms when rains dissolves trace gases in the atmosphere. Chapter 5 weathering and soil. Granite contains on average 75 of silicon dioxide quartz and feldspar various metal aluminosilicates. In order to assess the relationship between chemical weathering indices and physical properties of granite physical and chemical analyses were performed on both natural and artificially weathered granite samples from the seoul area where the ph of the rainfall occasionally drops to below 5.

The primary difference between physical weathering and chemical weathering is that physical weathering occurs landforms like rocks minerals and likewise substances are broken down by physical factors in the environment while chemical weathering occurs as a result of changes in the chemical composition of the minerals or rocks from exposure to the environment. Chemical weathering can produce caves made of limestone some types of rock are not easily weathered by chemicals. The physical and chemical weathering of a granite will produce. The reaction of feldspar minerals in granite with rainwater produces kaolinite white clay known as china clay used in the production of porcelain paper and glass.

The kinds of changes that take place are highly specific to the mineral and the environmental conditions. Granite is extremely hard and less affected by the freeze thaw cycle the forces of abrasion and the surface exfoliation processes that are all a part of physical weathering. The extent of weathering is dependent on the average atmospheric condition prevailing in a region over a long period of time. Mechanical weathering occurs when water drips or flows over rock for prolonged periods.

The grand canyon for example was formed to a large degree by the mechanical weathering action of the colorado river. A gravestone made of granite will therefore resist fracturing cracking and chipping longer than a sandstone marker found in the same location. Warm climates affect by chemical weathering while cold climates affect by physical weathering particularly by frost action. The deep red color of solis found in georgia and other warm humid regions in caused by.

There are two factors that play in weathering viz.