scholarly journals Tectonics and sedimentation during convergence of the ALCAPA and Tisza–Dacia continental blocks: the Pienide nappe emplacement and its foredeep (N. Romania)

2008 ◽  
Vol 298 (1) ◽  
pp. 317-334 ◽  
Author(s):  
M. Tischler ◽  
L. Matenco ◽  
S. Filipescu ◽  
H. R. Gröger ◽  
A. Wetzel ◽  
...  
Keyword(s):  
Nappe Emplacement ◽  
Tectonics And Sedimentation

Medium pressure metamorphism with inverted thermal gradient associated with ophiolite nappe emplacement in Timor

1989 ◽  
Vol 24 (2-3) ◽  
pp. 333-343 ◽  
Author(s):  
J. Sopaheluwakan ◽  
H. Helmers ◽  
S. Tjorkrosapoetro ◽  
E.Surya Nila
Keyword(s):  
Thermal Gradient ◽  
Medium Pressure ◽  
Nappe Emplacement

The geometry and structural evolution of a crustal-scale Caledonian fold complex: the Ballybofey Nappe, northwest Ireland

1994 ◽  
Vol 131 (4) ◽  
pp. 519-537 ◽  
Author(s):  
G. I. Alsop
Keyword(s):  
Structural Evolution ◽  
Sedimentary Facies ◽  
Crustal Thickening ◽  
Nappe Complex ◽  
Structural Regime ◽  
Gravity Driven ◽  
Facies Variation ◽  
Dominant Structure ◽  
Nappe Emplacement ◽  
Deformation Gradients

AbstractThe gross geometries exhibited by crustal-scale fold nappes are considered a consequence of both original stratigraphic relationships associated with sub-basin configuration, coupled with the nature of the structural regime and tectonic processes involved in the generation of the nappe pile. The Neo-Proterozoic Dalradian metasediments of northwestern Ireland provide a well-constrained and correlatable stratigraphy which defines a sequence of sub-reclined, tight-isoclinal Caledonian (c. 460 Ma) fold nappes. Within this fold complex, the dominant structure is the crustal-scale Ballybofey Nappe, which may be traced for 40 km along strike and is responsible for a regional (500 km2) stratigraphie inversion. The gentle, NE-plunging attitude of this fold results in a complete spectrum of tectonic levels and deformation gradients being exposed. Relatively low strains in the upper fold limb gradually increase down through the nappe, resulting in the generation of composite foliations and lineations and the development of a 10 km thick shear zone which culminates in a high strain basal detachment with underlying pre-Caledonian basement. The Ballybofey Nappe nucleated and propagated along a major zone of lateral sedimentary facies variation, coincident with the margin of a major Dalradian sub-basin. The large amplitude of the nappe is strongly influenced by the lateral heterogeneity within the metasedimentary sequence, and is associated with a minimum of 25–30 km ESE-directed translation concentrated within the overturned limb. Additional significant displacement is also focused along the basal décollement. Generation of the nappe complex resulted in significant crustal thickening and amphibolite facies metamorphism consistent with 15–18 km of burial, induced by a sequence of nappes propagating in the direction of overshear. The ESE-directed translation of the major fold nappes is away from the Caledonian foreland and a gravity-driven mechanism of nappe emplacement is suggested. Rigorous structural analysis within the cohesive stratigraphie framework enables relationships between the tectonic evolution and stratigraphic patterns to be distinguished, thus allowing models of fold nappe generation and mid-crustal deformation to be evaluated.

Westward propagation of thrusts in the external Western Alps (France) reappraised from an updated chronostratigraphy of the Miocene Molasses

2021 ◽  
Author(s):  
Amir Kalifi ◽  
Philippe-Hervé Leloup ◽  
Philippe Sorrel ◽  
Albert Galy ◽  
François Demory ◽  
...  
Keyword(s):  
Multidisciplinary Approach ◽  
Foreland Basin ◽  
Western Alps ◽  
Seismic Profiles ◽  
Stratigraphic Framework ◽  
Basin Scale ◽  
Deformation Kinematics ◽  
Westward Migration ◽  
External Part ◽  
Tectonics And Sedimentation

<p>The fact that the western Alps Miocene foreland basin succession is poorly dated impacts directly our understanding of the deformation kinematics of that part of the external part of the Alpine belt (France). Here we propose a multidisciplinary approach aiming at building a robust tectono-stratigraphic framework of the Miocene deposits at the basin scale (northern subalpine massifs, southern Jura, Royans, Bas-Dauphiné and La Bresse basins). Sr isotopes stratigraphy combined with magnetostratigraphy and biostratigraphy enable sequence stratigraphy subdivisions S1 to S8 between the Upper Aquitanian (-21 Ma) and the Tortonian (-9 Ma) dated with a precision <0.5 Ma. These results highlight four different palaeogeographical domains during the Miocene: (i) the oriental domain with depositional sequences S1a to S3 (~21.3 to 15Ma), (ii) the median domain, in which sequences S2, S3, S4 and S5 occurred (~17.8 to 14Ma), (iii) the occidental domain with sequences S2 to S8 (~17.8 to ~9.5Ma); and (iv) the Bressan domain, in which sequences S6 to S8 are found (~ 11.5 to ~9.5Ma).</p><p>This revised chronostratigraphy was complemented with a structural and tectono-sedimentary study based on new fieldwork data and a reappraisal of regional seismic profiles, allowing to highlight five major faults zones (FZ). It appears that the oriental, median and occidental paleogeographical domains are delineated by FZ1, FZ2 and FZ3, therefore suggesting a strong interplay between tectonics and sedimentation. Evidences of syntectonic deposits and a westward migration of the depocenters impart the following deformation chronology : a Oligocene compressive phase (P1) corresponding to thrusting above FZ1 rooted east (above) Belledonne, which generated reliefs that limited the early Miocene transgression to the east; an Early- to Middle Miocene W-WNW/E-ESE-directed compressive phase (P2) involving the Belledonne massif basal thrust, which between 18.05 +/- 0.15 Ma and 12Ma successively activated the Salève thrust fault, and the FZ2 to FZ5 from east to west. P2 deeply impacted the Miocene palaeogeographical evolution by a rapid westward migration of depocenters in response to the exhumation of piggy-back basins above the growing fault zones; a last Tortonian phase (P3), less well constrained, apparently implied a significant uplift in the subalpine massifs, combined with the activation of the frontal Jura thrust.</p>

VOLCANISM, TECTONICS AND SEDIMENTATION

1991 ◽  
pp. 1-5 ◽  
Author(s):  
RICHARD V. FISHER ◽  
GARY A. SMITH
Keyword(s):  
Tectonics And Sedimentation

INTERACTIONS BETWEEN SALT TECTONICS AND SEDIMENTATION IN THE LOUISIANA OFFSHORE: PRELIMINARY RESULTS

1993 ◽  
Author(s):  
MARK G. ROWAN ◽  
PAUL WEIMER ◽  
BARRY C. MCBRIDE ◽  
PETER VARNAI ◽  
ZURILMA ACOSTA ◽  
...  
Keyword(s):  
Salt Tectonics ◽  
Preliminary Results ◽  
Tectonics And Sedimentation
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