1 / 45

The Cameroon line

The Cameroon line Where? from Gondwana reconstruction & dispersion ... Unique: straddles passive continental margin. The Cameroon line - still active ...

Jeffrey
Download Presentation

The Cameroon line

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

    1. The Cameroon line, West Africa Mark Beaumont 1st year PhD Grant Institute Supervisors: JRU & JGF

    from Gondwana reconstruction & dispersion - University of Witwatersrand The Cameroon line – Where?

    3. The Cameroon line – Where?

    from Gondwana reconstruction & dispersion - University of Witwatersrand

    from Gondwana reconstruction & dispersion - University of Witwatersrand The Cameroon line – Where?

    5. The Cameroon line – Where?

    6. The Cameroon line – Where?

    7. The Cameroon line – What?

    8. The Cameroon line – What?

    9. The Cameroon line – Mount Cameroon

    Photo – Godfrey Fitton

    10. The Cameroon line – What?

    Volcanoes, Cones & Ring complexes

    11. The Cameroon line – What?

    Volcanic islands & Seamounts Volcanoes, Cones & Ring complexes

    12. The Cameroon line – What?

    Volcanoes, Cones & Ring complexes Volcanic islands & Seamounts Unique: straddles passive continental margin

    The Cameroon line - still active Photo – Godfrey Fitton Geochemistry indicates: Common mantle origin The Cameroon line – What? Geochemistry indicates: Common mantle origin Ages of Continental: 66 Ma to present (extrusive @35) The Cameroon line – What? Geochemistry indicates: Common mantle origin Ages of Continental: 66 Ma to present (extrusive @35) Oceanic: 31 Ma to present (earlier uplift) The Cameroon line – What? Geochemistry indicates: Common mantle origin Ages of Continental: 66 Ma to present (extrusive @35) Oceanic: 31 Ma to present (earlier uplift) The Cameroon line – What? But . . . . no linear age progression The Cameroon line – the Hawaii model? The Cameroon line – Regional geology from Brownfield (2006)

    20. The Cameroon line – regional context

    21. The Cameroon line – How?

    22. The Cameroon line – How?

    from Plate Tectonics - University of Leicester

    23. The Cameroon line – How?

    from Plate Tectonics - University of Leicester

    24. The Cameroon line – regional context

    25. The Cameroon line – regional context

    Basement lineaments & Oceanic transforms

    26. The Cameroon line – Controls?

    Controls ? Mantle: Thermal anomaly

    27. The Cameroon line – Controls?

    Controls ? Mantle: Thermal anomaly Regional context: Benue trough Basement lineaments

    28. The Cameroon line – How?

    Suggestions ? Linear Hot Spot (Plume) Wandering Hot Spot (Plume)

    29. The Cameroon line – How?

    Suggestions ? Linear Hot Spot (Plume) Wandering Hot Spot (Plume) Leaky Lineaments

    30. The Cameroon line – How?

    Suggestions ? Linear Hot Spot (Plume) Wandering Hot Spot (Plume) Leaky Lineaments Plate Rotation

    31. The Cameroon line – How?

    Suggestions ? Linear Hot Spot (Plume) Wandering Hot Spot (Plume) Leaky Lineaments Plate Rotation Y

    32. The Cameroon line – How?

    Suggestions ? Linear Hot Spot (Plume) Wandering Hot Spot (Plume) Leaky Lineaments Plate Rotation Y

    33. The Cameroon line – How?

    Suggestions ? Linear Hot Spot (Plume) Wandering Hot Spot (Plume) Leaky Lineaments Plate Rotation Mantle convection

    The Cameroon line – How? ?

    35. The Cameroon line – research method

    Tests ? Tectonic models Geochemistry Mantle models Mantle tomography

    36. The Cameroon line – research method

    Tests ? Tectonic models Geochemistry Mantle models Mantle tomography Seismic reflections

    37. The Cameroon line – existing seismic

    from Meyers & Rosendthal (1998) 2D on one transect – across oceanic CL Shows enough to suggest value of detailed 3D

    The Cameroon line - Oil Photo – Godfrey Fitton

    39. The Cameroon line – new seismic

    An example from the North Sea Kingdom software screenshot Kingdom software screenshot An example from the North Sea Kingdom software screenshot An example from the North Sea Output: Interpreted 3D map of 20,000 km3 The Cameroon line Output: Interpreted 3D map of 20,000 km3 Why? Unsolved enigmatic problem, opportunity to do something new Aims? Investigate structure & history of margin, constrain controls on CL What is known? Evidence from many disciplines but no integrated solution Design and method? Detailed interpretation of new 3d seismic volumes Resources? Seismic volumes, JGF, JRU, commercial partners Expectations? Structure & evolution, controls on CL The Cameroon line Output: Interpreted 3D map of 20,000 km3 Why? Unsolved enigmatic problem, opportunity to do something new Aims? Investigate structure & history of margin, constrain controls on CL What is known? Evidence from many disciplines but no integrated solution Design and method? Detailed interpretation of new 3d seismic volumes Resources? Seismic volumes, JGF, JRU, commercial partners Expectations? Structure & evolution, controls on CL Questions? The Cameroon line
More Related