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STRIKE- SLIP FAULTS IN SOME NORTH DOBROGEA UNITES (ROMANIA)
Abstract
The North Dobrogean Orogen is located between the Sf Gheorghe fault to the north and Peceneaga -Camena to the south. Structurally, it involves four tectonic units with NW-SE direction: M?cin unit, Niculi?el unit, Consul unit and Tulcea unit. The M?cin unit comprise a large variety of rocks assemblage, including sedimentary rocks, metamorphic rocks and igneous rocks. All this rocks assemblage belongs to several subunits developed on quasi-parallel NW-SE direction. M?cin unit has been interpreted as nappe folded over the Niculi?el and Consul units on SW-NE direction. Field measurement of the numerous fault and fissure planes, in M?cin unit and Consul unit, highlight a percolate movement on NW-SE direction that is in conformity with the limits of the major units. Faults slip sense was determined using the fault striations very widespread in this units, and kinematic indicators highlight a dextral strike-slip. The field observation doesn`t support the interpretation of M?cin unit nappes folded over the Niculi?el unit and Consul unit. Locally, M?cin unit and Consul unit have been disrupted by another secondary movements strike-slip type, but with different direction. The most prominent of this last fault direction are parallel with Pecineaga- Camena fault which delimitate North Dobrogea from Central Dobrogea.
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References13
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