Structural Expression of Extreme Rift-Flank Uplift Ring, Uwe; Koehn, Daniel; Rein, Bert and Passchier, Cees Institute of Geosiences, University of Mainz.

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Presentation transcript:

Structural Expression of Extreme Rift-Flank Uplift Ring, Uwe; Koehn, Daniel; Rein, Bert and Passchier, Cees Institute of Geosiences, University of Mainz In cooperation with Van der Pluijm, Ben; University of Michigan, USA Calais, Eric; Purdue University, USA Anders Malthe-Sørenssen, PGP Center, University of Oslo; Norway

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The East African Rift and the Ruwenzori Mountains

Rain Forest Rift Branch Rift Branch Rift Branch

Metre a.s.l. 1-Ruwenzori, 2-Western rift flank, 3-Eastern rift flank, 4-Lake Albert, 5- Lake Victoria, 6-Lake Edward, Rift A B C D E Ruwen- zori 4000 m 2000 m

Structural Analysis of the Rift Faults Detailed Mapping of Fault Patterns Detailed Mapping of Fault Patterns Fault Striation Data Fault Striation Data Localization of Faults Localization of Faults Estimate of Displacement Estimate of Displacement Estimate of Local Stress Field Estimate of Local Stress Field Compare with Seismic Data, Magnetotelluric data and Xenolith data -> Deeper Structure Valuable input for Dynamic Modeling

Dating of Fault Gouge (Cooperation with Ben van der Pluijm) Compare dating of fault movement and estimated uplift with low-T Geochronology and data from Sedimentology

(van der Pluijm et al., Nature 2001) Ar dating of Lewis Thrust, Canada Faulting: 52+/-3 Ma Faulting: 52+/-3 Ma Provenance: 172+/-6 Ma

GPS Data External Boundary Conditions External Boundary Conditions Local Uplift Local Uplift (Cooperation with Eric Calais) Valuable input for Dynamical Modeling

Numerical Modeling of Fault Patterns What is the influence of the regional geology prior to rifting on development of fault patterns in the rift ? What is the influence of the regional geology prior to rifting on development of fault patterns in the rift ? What is the influence of fault development on the stress field ? What is the influence of fault development on the stress field ? What kind of fault patterns develop given the external boundary conditions imposed by the GPS measurements ? What kind of fault patterns develop given the external boundary conditions imposed by the GPS measurements ? (Cooperation with Anders Malthe-Sørenssen) Compare Patterns with deeper structure of rift (Projects A1,A2,A3) Compare and combine fault models with Models of Project D2 Compare uplift estimates and morphology patterns with Projects B2, B3 and B4

Visco-Elasto-Plastic Model that includes dynamic fracturing extension „bridge“

Two BATIIa 1/2 for three years (should result in 2 Phd-thesis) 1.Sample natural fault slip data and perform numerical models 2.Satellite imagery, fault-gouge sampling and dating Schedule intro modeling remote sensing Field I sampling gouge kinematic analysis Field II sampling gouge large scale analysis Modeling of fault patterns Modeling of rift development and uplift Analysis of kinematic data Dating of fault gouge Preparation of Publications Dating of fault gouge Combine methods General Model

B1