Hey there! Sign in to join this conversationNew here? Join for free

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

    • Thread Starter
    Offline

    2
    ReputationRep:
    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
    Offline

    13
    ReputationRep:
    (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.
    • Thread Starter
    Offline

    2
    ReputationRep:
    (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
 
 
 
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • Poll
    Brexit voters: Do you stand by your vote?
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

    Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

    Write a reply...
    Reply
    Hide
    Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.