Structure of the Gare Kakheti foothills using seismic reflection profiles: implications for kinematic evolution of the Georgian part of Kura foreland fold-and-thrust belt

2020 ◽  
Author(s):  
Alexander Razmadze
Keyword(s):  
Cross Sections ◽  
Seismic Reflection ◽  
Structural Evolution ◽  
Foreland Basin ◽  
Thrust Belt ◽  
Fault Propagation ◽  
Seismic Reflection Data ◽  
Growth Strata ◽  
Kinematic Evolution ◽  
Fold And Thrust Belt

<p>Gare Kakheti foothills are located between Lesser Caucasus and Kakheti Ridge and are mainly represented by the series of NEN dipping thrust faults, most of which are associated with fault‐related folds. Gare Kakheti foothills as a part of the Kura foreland fold-and-thrust belt developed formerly as a foreland basin (Oligocene-Lower Miocene) (e.g. Alania et al., 2017). Neogene shallow marine and continental sediments in the Gare Kakheti foothills keep the record on the stratigraphy and structural evolution of the study area during the compressive deformation. Interpreted seismic profiles and structural cross-sections across the Udabno, Tsitsmatiani, and Berebisseri synclines show that they are thrust-top basins. Seismic reflection data reveal the presence of growth fault-propagation folds and some structural wedges (or duplex). The evolution of the Udabno, Tsitsmatiani, and Berebisseri basins is compared with simple models of thrust-top basins whose development is controlled by the kinematics of competing for growth anticlines. Growth anticlines are mainly represented by fault-propagation folds. The geometry of growth strata in associated footwall synclines and the sedimentary infill of thrust-top basins provide information on the thrusting activity in terms of location, geometry, and age.<br>This work was supported by Shota Rustaveli National Science Foundation (SRNSF - #PHDF-19-268).</p><p> </p>

scholarly journals Structure and tectonic evolution of hybrid thick- and thin-skinned systems in the Malargüe fold–thrust belt, Neuquén basin, Argentina

2016 ◽  
Vol 153 (5-6) ◽  
pp. 1066-1084 ◽  
Author(s):  
FACUNDO FUENTES ◽  
BRIAN K. HORTON ◽  
DANIEL STARCK ◽  
ANDRÉS BOLL
Keyword(s):  
Cross Sections ◽  
Hanging Wall ◽  
Foreland Basin ◽  
Thrust Belt ◽  
Kinematic Evolution ◽  
Basement Faults ◽  
Neuquen Basin ◽  
Structural Relief ◽  
Basement Structures ◽  
Neuquén Basin

AbstractAndean Cenozoic shortening within the Malargüe fold–thrust belt of west-central Argentina has been dominated by basement faults largely influenced by pre-existing Mesozoic rift structures of the Neuquén basin system. The basement contractional structures, however, diverge from many classic inversion geometries in that they formed large hanging-wall anticlines with steeply dipping frontal forelimbs and structural relief in the order of several kilometres. During Cenozoic E–W shortening, the reactivated basement faults propagated into cover strata, feeding slip to shallow thrust systems that were later carried in piggyback fashion above newly formed basement structures, yielding complex thick- and thin-skinned structural relationships. In the adjacent foreland, Cenozoic clastic strata recorded the broad kinematic evolution of the fold–thrust belt. We present a set of structural cross-sections supported by regional surface maps and industry seismic and well data, along with new stratigraphic information for associated Neogene synorogenic foreland basin fill. Collectively, these results provide important constraints on the temporal and geometric linkages between the deeper basement faults (including both reactivated and newly formed structures) and shallow thin-skinned thrust systems, which, in turn, offer insights for the understanding of hydrocarbon systems in the actively explored Neuquén region of the Andean orogenic belt.

Integrated Cretaceous–Cenozoic plate tectonics and structural geology in southern Mexico

2020 ◽  
pp. SP504-2020-70
Author(s):  
Rod Graham ◽  
James Pindell ◽  
Diego Villagómez ◽  
Roberto Molina-Garza ◽  
James Granath ◽  
...  
Keyword(s):  
Cross Sections ◽  
Tectonic Evolution ◽  
Plate Tectonics ◽  
Plate Boundary ◽  
Structural Evolution ◽  
Thrust Belt ◽  
Cocos Plate ◽  
Southern Mexico ◽  
Arc Volcanism ◽  
Fold And Thrust Belt

AbstractThe structural evolution of southern Mexico is described in the context of its plate tectonic evolution and illustrated by two restored crustal scale cross-sections through Cuicateco and the Veracruz Basin and a third across Chiapas. We interpret the Late Jurassic–Early Cretaceous opening of an oblique hyper-stretched intra-arc basin between the Cuicateco Belt and Oaxaca Block of southern Mexico where Lower Cretaceous deep-water sediments accumulated. These rocks, together with the hyper-stretched basement beneath them and the Oaxaca Block originally west of them, were thrust onto the Cretaceous platform of the Cuicateco region during a Late Cretaceous–Eocene orogenic event. The mylonitic complex of the Sierra de Juárez represents this hyper-stretched basement, perhaps itself an extensional allochthon. The Chiapas fold-and-thrust belt is mainly Neogene in age. Shallowing of the subduction angle of the Cocos Plate in the wake of the Chortis Block, suggested by seismicity and migrating arc volcanism, is thought to play an important role in the development of the Chiapas fold-and-thrust belt itself, helping to explain the structural dilemma of a vertical transcurrent plate boundary fault (the Tonalá Fault) at the back of an essentially dip-slip fold-and-thrust belt.

Kinematic evolution of the Patagonian retroarc fold-and-thrust belt and Magallanes foreland basin, Chile and Argentina, 51 30'S

2011 ◽  
Vol 123 (9-10) ◽  
pp. 1679-1698 ◽  
Author(s):  
J. C. Fosdick ◽  
B. W. Romans ◽  
A. Fildani ◽  
A. Bernhardt ◽  
M. Calderon ◽  
...  
Keyword(s):  
Foreland Basin ◽  
Thrust Belt ◽  
Kinematic Evolution ◽  
Fold And Thrust Belt

3D structural modelling of the southern Zagros fold-and-thrust belt diapiric province

2011 ◽  
Vol 148 (5-6) ◽  
pp. 879-900 ◽  
Author(s):  
VINCENT TROCMÉ ◽  
EMILY ALBOUY ◽  
JEAN-PAUL CALLOT ◽  
JEAN LETOUZEY ◽  
NICOLAS ROLLAND ◽  
...  
Keyword(s):  
Cross Sections ◽  
Seismic Data ◽  
Morphological Changes ◽  
Velocity Model ◽  
3D Modelling ◽  
Time Signal ◽  
Thrust Belt ◽  
Growth Strata ◽  
Fold And Thrust Belt ◽  
Seismic Lines

Abstract3D modelling of geological structures is a key method to improve the understanding of the geological history of an area, and to serve as a drive for exploration. Geomodelling has been performed on a large 60000 km2 area of the Zagros fold-and-thrust belt of Iran, to reconcile a vast but heterogeneous dataset. Topography, geological surface data and dips, outcrop surveys, and well and seismic data were integrated into the model. The method was to construct a key surface maximizing the hard data constraints. The Oligo-Miocene Top Asmari layer was chosen, as this formation was regionally deposited before the main Zagros collision phase and because the numerous outcrops allow proper control of the bed geometry in the fold cores. Interpreted seismic data have been integrated to interpolate the surfaces at depth within the synclines. Several conceptual models of fold geometry have been applied to estimate the best way to convert seismic time signal to depth. Several deeper horizons down to Palaeozoic strata were deduced from this key horizon by applying palaeo-thickness maps. During the construction, the 3D interpolated surfaces could be reconverted to time, using a velocity model, and compared with previous seismic interpretations. This exercise obliged us to revise some early interpretations of seismic lines that were badly tied to wells. The 3D modelling therefore clearly improves regional interpretation. In addition, the 3D model is the only tool that allows drawing consistent cross-sections in areas where there are no seismic lines. Emerging Hormuz salt diapirs were added to the model. Dimensions and shapes of the individual diapirs were modelled using a statistical survey on the cropping out Hormuz structures. Modelling reliably demonstrated that the diapirs, when piercing, show a constant mushroom shape whose diameter depends on the stratigraphic depth of observation. This observation allowed us to exemplify relations between the pre-existing diapirs and the anticlines of the area, and to highlight the morphological changes from the inner onshore areas to the coastal and offshore areas. In addition, one of the surprising results of this study was the observation of the increasing diameter of the diapirs at the time of the Zagros collision and folding event, with growth strata and overhangs on the flanks of the diapirs.

The pre-Mesozoic basement underneath the Jura Mountains fold-and-thrust belt: an overview from models and maps

2020 ◽  
Author(s):  
Marc Schori ◽  
Anna Sommaruga ◽  
Jon Mosar
Keyword(s):  
Cross Sections ◽  
Structural Evolution ◽  
Rift System ◽  
European Alps ◽  
Thrust Belt ◽  
Jura Mountains ◽  
Basement Faults ◽  
Fold And Thrust Belt ◽  
Spatio Temporal ◽  
Basement Structures

<p>The Jura Mountains are a thin-skinned fold-and-thrust belt (FTB) in the northern foreland of the European Alps, extending over northern and western Switzerland and eastern France. The Jura FTB was detached in Triassic evaporites during Late Miocene and Pliocene compression. Prior to this, the pre-Mesozoic basement was intensely pre-structured by inherited faults that had been reactivated under changing stress fields during the Mesozoic and Cenozoic structural evolution of continental Europe. In order to understand the connection between thin-skinned FTB formation and pre-existing basement structures, we compiled boreholes and geological cross-sections across the Northern Alpine Foreland and derived elevation, thickness and erosion models of defined Mesozoic units and the top of the pre-Mesozoic basement.</p><p>Our models confirm the presence of basement faults concealed underneath the detached cover of the Jura Mountains. The pre-Mesozoic basement shows differences in structural altitudes resulting from partially overlapping lithospheric processes. They include graben formation during evolution of the European Cenozoic Rift System (ECRIS), flexural subsidence during Alpine forebulge development and lithospheric long-wavelength buckle folding. Faults in connection with these processes follow structural trends that suggest the reactivation of inherited Variscan and post-Variscan fault systems. We discuss the spatio-temporal imprint of lithospheric signatures on the pre-Mesozoic basement and their consequence on the formation of the Jura Mountains FTB. Untangling structures within the pre-Mesozoic basement leads us to a modern understanding of the long-term evolution of the detached Mesozoic cover. Furthermore, it allows us to improve the prediction of ages that are potentially preserved within the Mesozoic cover of the Jura FTB.</p>

scholarly journals The structure of the northern Agrio fold and thrust belt (37°30’ S), Neuquén Basin, Argentina

2018 ◽  
Vol 45 (2) ◽  
pp. 249 ◽  
Author(s):  
Fernando Lebinson ◽  
Martín Turienzo ◽  
Natalia Sánchez ◽  
Vanesa Araujo ◽  
María Celeste D’Annunzio ◽  
...  
Keyword(s):  
Cross Sections ◽  
Sedimentary Cover ◽  
Structural Evolution ◽  
Normal Faults ◽  
Suitable Model ◽  
South American ◽  
Thrust Belt ◽  
Seismic Line ◽  
Fold And Thrust Belt ◽  
Fault Bend

The Agrio fold and thrust belt is a thick-skinned orogenic belt developed since Late Cretaceous in response to the convergence between the Nazca and South American plates. The integration of new structural field data and seismic line interpretation allowed us to create two balanced cross-sections, which help to analyse the geometry of both thick and thin-skinned structures, to calculate the tectonic shortenings and finally to discuss the main mechanisms that produced this fold and thrust belt. The predominantly NNW-SSE structures show varying wavelengths, and can be classified into kilometer-scale first order basement involved structures and smaller second, third and fourth order fault-related folds in cover rocks with shallower detachments. Thick-skinned structures comprise fault-bend folds moving into the sedimentary cover, mainly along Late Jurassic evaporites, which form basement wedges that transfer the deformation to the foreland. Thus, shortenings in both basement and cover rocks must be similar and consequently, by measuring the contraction accounted for thin-skinned structures, is possible to propose a suitable model for the thick skinned deformation. The balanced cross-sections indicate shortenings of 11.2 km (18%) for the northern section and 10.9 km (17.3%) for the southern section. These values are different from the shortenings established by previous works in the region, reflecting differences in the assumed model to explain the basement-involved structures. According to our interpretation, the structural evolution of this fold and thrust belt was controlled by major basement-involved thrust systems with subordinate influence of inversion along pre-existing normal faults during the Andean compression.

Formation and forward propagation of the Indosinian Nanpanjiang foreland basin and foreland thrust belt in SW China

2020 ◽  
Author(s):  
Wen-Xin Yang ◽  
Dan-Ping Yan ◽  
Liang Qiu ◽  
Michael. L Wells ◽  
Jian-Meng Dong ◽  
...  
Keyword(s):  
Cross Sections ◽  
Foreland Basin ◽  
Thrust Belt ◽  
Carbonate Platforms ◽  
Seismic Profiles ◽  
Clastic Rocks ◽  
Fold And Thrust Belt ◽  
Marine Carbonate ◽  
Icp Ms ◽  
Youjiang Basin

<p>Nanpanjiang Basin (also called the Youjiang Basin or Dian-Qian-Gui Basin in literatures), the foreland basin of the Indosinian orogenic belt, is located on the boundary belt between the South China and Indochina Blocks. This foreland basin is characterized by a transition from the Early Triassic shallow-marine carbonate platforms to Middle and Upper Triassic continental facies clastic rocks and reworked by the subsequent Indosinian foreland thrusting and deformations. The development of the Indosinian foreland fold-and-thrust belt remains underappreciated in part because of the loose constraints of the transition from basin deposition to deformation and erosion. In this study, we present two geological cross-sections that synthesized field geological investigations, together with the structural interpretation of three seismic profiles, and LA-ICP-MS detrital zircon age constraints. The results reveal that the thrust belt is characterized by fault-related folds with duplex and imbricate thrusts, which yield the NNE-trending regional shortening estimate of ~36%. The new constraints indicate that the Nanpanjiang foreland basin formed before 237 Ma (D<sub>1</sub><sup>1</sup>) was overridden by the following NNE-ward progressive deformations, including 237-225 Ma thick-skinned thrusts (D<sub>1</sub><sup>2</sup>), 223-183 Ma thin-skinned thrusts (D<sub>1</sub><sup>3</sup>), and after that entire basin-involved deformation (D<sub>1</sub><sup>4</sup>). Subsequently, D<sub>1</sub> was re-deformed and superimposed by the Middle to Late Jurassic NNE-striking fault-related fold system (D<sub>2</sub>). D<sub>1</sub><sup>1-4</sup> reveals a NNE-verging propagation in-sequence foreland thrusting which overrode the foreland basin and the corresponded NNE-ward progressive foreland basin during the Indosinian.</p>

Spatio-temporal structural evolution of the Kohat fold and thrust belt of Pakistan

2021 ◽  
Vol 145 ◽  
pp. 104310
Author(s):  
Humaad Ghani ◽  
Edward R. Sobel ◽  
Gerold Zeilinger ◽  
Johannes Glodny ◽  
Irum Irum ◽  
...  
Keyword(s):  
Structural Evolution ◽  
Thrust Belt ◽  
Fold And Thrust Belt ◽  
Spatio Temporal

scholarly journals Sandstone Petrology and Provenance in Fold Thrust Belt and Foreland Basin System

2021 ◽  
Author(s):  
Salvatore Critelli ◽  
Sara Criniti
Keyword(s):  
Foreland Basin ◽  
Thrust Belt ◽  
Fold And Thrust Belt ◽  
Continental Block ◽  
Wide Range ◽  
Geodynamic Processes ◽  
Dual Plate ◽  
History Of ◽  
Sandstone Composition ◽  
Main Producer

The sandstone composition of foreland basin has a wide range of provenance signatures, reflecting the interplay between flexed underplate region and abrupt growth of the accreted upper plate region. The combination of contrasting detrital signatures reflects these dual plate interactions; indeed, several cases figure out that the earliest history of older foreland basin infilling is marked by quartz-rich sandstones, with cratonal or continental-block provenance of the flexed underplate flanks. As upper plate margin grows over the underplate, the nascent fold-and-thrust belt starts to be the main producer of grain particles, reflecting the space/time dependent progressive unroofing of the subjacent orogenic source terranes. The latter geodynamic processes are mainly reflected in the nature of sandstone compositions that become more lithic fragment-rich and feldspar-rich as the fold-thrust belt involves the progressive deepest portions of upper plate crustal terranes. In this context sandstone signatures reflect quartzolithic to quartzofeldspathic compositions.

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