North Atlantic workshop 11/2017, Durham

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Presentation transcript:

North Atlantic workshop 11/2017, Durham Status: Review of the role of inheritance in the formation of the Circum-North Atlantic region Tony Doré, Christian Schiffer, R. Foulger, Dieter Franke, Laurent Geoffroy, Laurent Gernigon, Bob Holdsworth, Ken McCaffrey, Alex Peace, Kenni Petersen, Randell Stephenson, Kim Welford (and others?) North Atlantic workshop 11/2017, Durham

Outline Introduction (Tony & Christian) Definition and scales of inheritance/reactivation/reworking from lithospheric to grain scale (Bob) Overall North Atlantic structure (Erik) North Atlantic inheritance at different scales (observations and models/concepts) Wilson Cycle and modifications/extensions (Christian) Lithospheric scale reactivation Basin scale Sub-basin to grain scale Discussion (under construction) The Wilson Cycle revisited How important is reactivation for the NA. Where does it and where does it not work (map) What are the geological/geodynamic prerequisites Wider applications (is the NA typical for continental breakup? Can it be used as a template) Future directions (Imber paper)

Status Introduction (Tony & Christian) Definition and scales of inheritance/reactivation/reworking from lithospheric to grain scale (Bob) Overall North Atlantic structure (Erik) North Atlantic inheritance at different scales (observations and models/concepts) Wilson Cycle and modifications/extensions (Christian) Lithospheric scale reactivation Rheology, composition, thermal state and structure of the lithosphere and numerical modelling of the lithosphere (Kenni) development of mantle fabrics (Christian) post-orogenic collapse (Christian Role of transforms (Tony) Inheritance and magmatism (???) microcontinent formation (Laurent Gernigon, Christian Schiffer) Lower crustal bodies/High velocity lower crust (Laurent Gernigon, Christian Schiffer) Basin scale Overview, including analogue modelling (Tony) North Atlantic passive margins (Laurent Geoffroy) Labrador Sea-Baffin Bay-West Greenland (Alex, Kim)

Status Sub-basin to grain scale Overview (Bob) Reactivated fault styles and observations (Bob) Fault growth, fault propagation (Ken) Discussion (under construction) The Wilson Cycle revisited How important is reactivation for the NA. Where does it and where does it not work (map) What are the geological/geodynamic prerequisites Wider applications (is the NA typical for continental breakup? Can it be used as a template) Future directions (Imber paper)

Inheritance at different scales (Bob)

Rift propagation

North Atlantic structure Relationships Strucutres Crustal thickness Magmatism Rifting Setting up the scene!

modifications/extensions The Wilson Cycle and modifications/extensions History Supercontient Cycle Continental insulation Intraplate deformation Cases for which WC did not work (with map) Cratons (amalgamtion, no subsequent breakup) Rifting through old orogens (LS-BB)

Mantle fabrics/anisotropy Orogenic mantle fabric Transpression -> maybe not parallel to first order axis of the Caledonides?

Mantle fabrics/anisotropy Orogenic mantle fabric Transpression -> maybe not parallel to first order axis of the Caledonides?

Microcontinent formation

Microcontinent formation

Discussion

Discussion

Status Introduction (Tony & Christian) Definition and scales of inheritance/reactivation/reworking from lithospheric to grain scale (Bob) Overall North Atlantic structure (Erik) North Atlantic inheritance at different scales (observations and models/concepts) Wilson Cycle and modifications/extensions (Christian) Lithospheric scale reactivation Rheology, composition, thermal state and structure of the lithosphere and numerical modelling of the lithosphere (Kenni) development of mantle fabrics (Christian) post-orogenic collapse (Christian Role of transforms (Tony) Inheritance and magmatism (???) microcontinent formation (Laurent Gernigon, Christian Schiffer) Lower crustal bodies/High velocity lower crust (Laurent Gernigon, Christian Schiffer) Basin scale Overview, including analogue modelling (Tony) North Atlantic passive margins (Laurent Geoffroy) Labrador Sea-Baffin Bay-West Greenland (Alex, Kim)

Status Sub-basin to grain scale Overview (Bob) Reactivated fault styles and observations (Bob) Fault growth, fault propagation (Ken) Discussion (under construction) The Wilson Cycle revisited How important is reactivation for the NA. Where does it and where does it not work (map) What are the geological/geodynamic prerequisites Wider applications (is the NA typical for continental breakup? Can it be used as a template) Future directions (Imber paper)