GL4 E1 Key Idea 2 b i SEDIMENTARY ROCKS

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Presentation transcript:

GL4 E1 Key Idea 2 b i SEDIMENTARY ROCKS The mineralogy and texture of sedimentary rocks are controlled by processes of weathering, erosion and deposition

GL4 E1 KI2 b (i) Weathering WEATHERING: physical breaking up of rock into smaller pieces and chemical breakdown of rock at the Earth’s surface Geoscience page 80 figure 5.11 COPY (NB: of importance in specification: heating/cooling, freeze/thaw, hydrolysis, carbonation, solution and oxidation)

What does weathering do? Breaks down SILICATE rocks into: QUARTZ MUSCOVITE CLAY MINERALS SOLUBLE SALTS IRON OXIDES RESISTANT HEAVY MINERALS

Rates of weathering: Controlled by local conditions Temperature, Humidity, chemical composition of Rainfall, amount and type of Vegetation Mainly controlled by CLIMATE Geoscience page 81 Figure 5.12 COPY Also plot rainforest (high rainfall, high temperature), periglacial desert (low rainfall, low temperatures), Saharan desert (low rainfall, high temperatures)