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|Title: ||Tectónica da região de Sintra|
|Authors: ||Kullberg, M. C.|
Kullberg, J. C.
|Issue Date: ||2000|
|Publisher: ||Museu Nacional de História Natural da Universidade de Lisboa|
|Abstract: ||Photo-interpretation of aerial stereopairs of the Sintra region on the approx. 1/32 000 scale together
with field work allowed the production of the present Tectonic Map of the Sintra region.
It is now possible to separate structures which resulted from two different tectonic events: one,
corresponding to the intrusion of the Late Cretaceous Sintra igneous diapir, and the other the Miocene
compressive event, the most important tectonic inversion phase of the Lusitanian Basin.
The former are present to the south, southeast and east of the intrusion and within the intrusion
itself, affecting the peripheral granites and their contacts with the gabbro-syenite core.
These structures comprehend: i) faults and conical fractures striking parallel to the massif
boundary, which were intruded by dykes, ii) vertical faults and fractures of two conjugate sets, dextral
NNW-SSE and sinistral NNE-SSW. These faults are certainly associated with the E-W striking
massif's northwards directed thrust and indicate a N-S oriented horizontal maximum compressive
The Miocene compressive event reactivated most of the inherited structures as follows. The NNWSSE
faults located on the Sintra southern platform were reactivated as dextral strike slip faults and the
E-W thrust along the northern boundary of the massif was also reactivated. This thrust propagated to
the east. It also enhanced the asymmetry of the rim-syncline, uplifted the massif and reactivated the
NNE-SSW faults as sinistral lateral ramps, which also accommodated vertical throw. The present
Tectonic Map of Sintra together with the available geophysical data (MOREIRA, 1984, KULLBERG et
al., 1991, SILVA & MIRANDA, 1994) allowed reassessment of the models proposed for the
emplacement of the Sintra, Sines and Monchique igneous massifs, which intruded during Late
Cretaceous times along the deep dextral NNW-SSE oriented strike slip fault (RIBEIRO et al., 1979;
TERRINHA, 1998; TERRINHA & KULLBERG, 1998).|
|Appears in Collections:||FCT: DCT - Artigos em revista nacional com arbitragem científica|
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