 |
| Titel |
The fracture pattern of the Sant Corneli oblique inversion anticline (Spanish Pyrenees). |
| VerfasserIn |
Stefano Tavani, Jordi Bausa, Joana Mencos, Josep Anton Muñoz |
| Konferenz |
EGU General Assembly 2011
|
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250055400
|
|
|
|
|
|
| Zusammenfassung |
| In this work we present the macro and mesostructural deformation
patterns of the Late Cretaceous Sant Corneli oblique inversion
anticline (Spanish Pyrenees). This E-W striking and south-verging
structure developed by inversion of an Early Cretaceous extensional
fault system, formed by WNW-ESE striking faults (oriented
perpendicular to the Early Cretaceous stretching direction) and
transfer faults. During inversion, the shortening direction was
oriented NNW-SSE, i.e. oblique to both basin margin and inherited
extensional deformation structures. A pre to early-folding
layer-parallel shortening stage (LPS) caused the right-lateral
strike-slip reworking of inherited extensional structures and the
development of extensional and contractional structures oriented
parallel and perpendicular to the shortening direction, respectively.
Few structures clearly developed during the late stages of fold
growth, in response to a stress field having principal axes parallel
to those of the layer parallel shortening event, i.e. oblique to the
fold axis. All these assemblages were overprinted by a set of
post-folding extensional structures, oriented oblique to the strike of the Sant corneli Anticline too.
Rare WSW-ENE striking joints and veins postdate the LPS pattern and
can be associated with a sin-folding layer parallel stretching. These
structures strike parallel to few reverse faults that, in both fold
limbs, indicate a top to the crest shear sense that we associate with
flexural-slip folding. Both layer-parallel stretching and shear sense
provided by flexural-slip related elements are not perpendicular to
the fold axial trend.
From our data arise that, in the Sant Corneli Anticline, the
sin-inversion deformation pattern includes elements that are neither
parallel nor perpendicular to the fold axial trend, being the strike
of these structures controlled by the inherited extensional structures and the regional shortening direction. |
|
|
|
|
|
|