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Aegean (Aegean Geodynamics (Aegean = sea between Greece & Turkey,…
Aegean
Aegean Geodynamics
Aegean = sea between Greece & Turkey
Series of basins North of Hellenic subduction zone
i.e. alternating highs & lows (horst & graben)
where whole crust extended NE-SW
Corinth
Rift
Most rapidly opening rift in the world -
1.6 cm / year
Rifting began ~ 4 Ma
Only
Southern margin = uplifed
Elongate basin formed due to extension (rifting)
Fault maps agree on:
Presence of Corinth Gulf basin
= Very narrow rift basin
Series of faults adjacent
Some folds inland
Corinth Rift contrasts Appenines
Corinth Rift =
v asymmetrical
whereas Appenines has faults dipping in many different directions
One big rift basin
Appenines - series of small basins (vs one big one)
One major fault on S side
Appenines - many small faults
Subsidence & sedimentation
= significant in Corinth basin
Corinth Gulf Active Faults
Fault maps across Corinth Gulf show greatly differing fault length / orientations
Despite same data source...
Oil companies massaging facts ?
Further evidence
of rift
= Extensive Plio-Quaternary deposits on S side of rift
= Continental & marine deposits
Marine component testifies to uplift on South side
Uplifted Terraces Xylokstro Fault
Plioquaternary sediments = continental / marine sediments
Series of terraces represent sea level at certain times in history
' staircase of terraces '
Sediments now several hundred metres above sea level ∴ UPLIFTED
Uplifted
Terraces
Terrace elevation w/distance from Xalokastro fault
= correlated with sealevel highstands
Backtilting effect observed
Terraces (∴ footwall) = tilted inland
Armijo modelled Corinth Rift evolution
--> using these observations to inform model
Corinth = Asymmetric Rift
Early rift = numerous small faults develop
= series of horst & grabens
Late rift = major fault develops in South
major fault on S accomodates most of deformation
displacement up to 4 km
Terraces - Useful
To understand rheology in rift
To constrain displacement extent