by t neil irvine jens christian andersen and c kent brooks
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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

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

Autolith blocks and rhythmic modally graded layers in the Skaergaard intrusion

Presented by: Angelique Laurie

the skaergaard intrusion introduction and emplacement
The Skaergaard intrusion: Introduction and emplacement

Fig 1: Skaergaard emplacement (Geological Society of America, November, pg 1401)

skaergaard series
Skaergaard : Series’
  • Layered Series
  • Marginal Series
  • Upper Border Series
the skaergaard intrusion series
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/

skaergaard layering
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/ )

blocks and block structures
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)

deposition of modally sorted layers
Deposition of modally sorted layers

1) Boundary flow seperation and reattachment

Fig 11: S-R cell (Geological Society of America Bulletin, November, pg 1438)

deposition of modally sorted layers1
Deposition of modally sorted layers

2) Density surge currents

Fig 12:Density surge currents (Geological Society of America Bulletin, November, pg 1438)

conclusion
Conclusion

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

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