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By T. Neil Irvine, Jens Christian Andersen and C. Kent Brooks

Included blocks (and blocks within blocks) in the Skaergaard intrusion: Geologic relations and the origins of rhythmic modally graded layers. By T. Neil Irvine, Jens Christian Andersen and C. Kent Brooks. Autolith blocks and rhythmic modally graded layers in the Skaergaard intrusion.

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By T. Neil Irvine, Jens Christian Andersen and C. Kent Brooks

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  1. Included blocks (and blocks within blocks) in the Skaergaard intrusion: Geologic relations and the origins of rhythmic modally graded layers By T. Neil Irvine, Jens Christian Andersen and C. Kent Brooks

  2. Autolith blocks and rhythmic modally graded layers in the Skaergaard intrusion Presented by: Angelique Laurie

  3. The Skaergaard intrusion: Introduction and emplacement Fig 1: Skaergaard emplacement (Geological Society of America, November, pg 1401)

  4. Skaergaard : Series’ • Layered Series • Marginal Series • Upper Border Series

  5. The Skaergaard intrusion: Series’ Fig 2: Skaergaard shape and series’ (Origin of Igneous Layering edited by Ian Parsons, pg 205) Fig 3: Skaergaard Series’ (www.union.edu/PUBLIC/GEODEPT/hollocher/skaergaard/

  6. Skaergaard layering 1) Modally graded layers 2) Uniform/isomodal layers Fig 4: Modally graded and uniform layers (www.union.edu/PUBLIC/GEODEPT/hollocher/skaergaard/ ) 4) Micro-rhythmic layers 3) Macro-rhythmic layers Fig 5: Macro-rythmic layers (www.union.edu/PUBLIC/GEODEPT/hollocher/skaergaard/ ) Fig 6: Micro-rhythmic layers (www.union.edu/PUBLIC/GEODEPT/hollocher/skaergaard/ )

  7. Blocks and Block Structures 1) Streamlining 2) Block impact structures Fig 7: Steamlining (Geological Society of America Bulletin, November, pg 1420) Fig 8: Block impact structures (Origins of igneous layering, Ian Parsons, pg 218) 3) Fragmental layers 4) Trough layering structures Fig 9: Fragmental layers (www.union.edu/PUBLIC/GEODEPT/hollocher/skaergaard/ ) Fig 10: Fragmental layers (Geological Society of America Bulletin, November, pg 1420)

  8. Deposition of modally sorted layers 1) Boundary flow seperation and reattachment Fig 11: S-R cell (Geological Society of America Bulletin, November, pg 1438)

  9. Deposition of modally sorted layers 2) Density surge currents Fig 12:Density surge currents (Geological Society of America Bulletin, November, pg 1438)

  10. Conclusion Fig 13: Processes occuring in the western hal fof the Skaergaard magma chamber (Geological Society of America Bulletin, November 1998 pg 1442)

  11. Comparison with Bushveld Igneous complex

  12. Thank –you!

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