Magnetic Evidence for Tectonic Movements Related to Paleo-OCC Massif at Troodos Ophiolite, Cyprus
Abstract
Troodos Forest Fault (TFF) juxtaposes a dome-shaped mantle serpentinite with lower crust gabbro exposures at the Troodos massif. The fault forms a part of the lower cretaceous hydrothermal system of the Solea paleo-spreading center. A paleomagnetic survey is designed to test the hypothesis of the TFF-Amiandos role in OCC development at Troodos. Dense Sampling included 38 sites at the gabbro suite along two main transects: East-West across the OCC dome; North-East - South-West along the central graben axis towards the Arakapas paleo-transform. Comparing ChRM vector at each site with the Troodos mean vector (TMV) reveals significant rotations at the vicinity of the fault, and small rotations under the detachment surface to the west (at the suggested breakaway). The rotation pattern broadly suits the expected OCC footwall deformation at different depths of the lower crust. The results show two domains at the Solea axis - rotation along the axis versus stability at the upper-lower crust. Magneto-fabric (AMS) measurements to unravel patterns of magma supply will be presented elsewhere. This research completes the last piece at a complex deformation map of the lower crust in the oceanic ridge-transform intersection, a map charted by previous research; the in-situ magnetic information, reported here for the first time, will constrain tectonic models based on geophysical data from mid-oceanic ridges.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2019
- Bibcode:
- 2019AGUFM.T13I0280K
- Keywords:
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- 3035 Midocean ridge processes;
- MARINE GEOLOGY AND GEOPHYSICS;
- 8034 Rheology and friction of fault zones;
- STRUCTURAL GEOLOGY;
- 8135 Hydrothermal systems;
- TECTONOPHYSICS;
- 8178 Tectonics and magmatism;
- TECTONOPHYSICS