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How do granite boulders and pebbles get into sedimentary strata? (in a cliff) watch

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    I know that Granite is an igneous intrusive rock so is formed within the earth by cooling magma, but how does it get to into sedimentary strata in the case of a cliff? whats the sequence of events?

    is it uplifted by folding and erosion then eroded and carried and dumped in low energy places?

    any help appreciated
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    (Original post by Flo_Ryder89)
    I know that Granite is an igneous intrusive rock so is formed within the earth by cooling magma, but how does it get to into sedimentary strata in the case of a cliff? whats the sequence of events?

    is it uplifted by folding and erosion then eroded and carried and dumped in low energy places?

    any help appreciated
    Granite batholiths get exposed to air and surface water by the erosion of the softer metamorphic rocks that surround them and start to 'rot' - this occurs via the degradation of the feldspars in the granite. Once this has happened, it is a lot easier for fracturing to occur, and boulders by chance fall away from the main body of rock. This occurs until the boulder is completely fragmented or it ends up in a stream where the fragmentation process is sped up. Vegetation can speed up this process.
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    (Original post by dsch)
    Granite batholiths get exposed to air and surface water by the erosion of the softer metamorphic rocks that surround them and start to 'rot' - this occurs via the degradation of the feldspars in the granite. Once this has happened, it is a lot easier for fracturing to occur, and boulders by chance fall away from the main body of rock. This occurs until the boulder is completely fragmented or it ends up in a stream where the fragmentation process is sped up. Vegetation can speed up this process.
    thanks for that
 
 
 

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