The Tectonic Development of the Western Weald in Lower Cretaceous Times

1933 ◽  
Vol 70 (6) ◽  
pp. 254-268 ◽  
Author(s):  
J. F. Kirkaldy
Keyword(s):  
Lower Cretaceous ◽  
Tectonic Activity ◽  
Structural Units ◽  
Tectonic History ◽  
History Of ◽  
Tectonic Development

Modern detailed stratigraphical studies have demonstrated very clearly the long and involved tectonic history of the majority of the main structural units of England. It has been proved that, in certain areas, the thickness and the lithology of the sediments were partly determined by repeated pene-contemporaneous folding along definite axes, and thus it has been possible to trace the gradual growth of some of the main fold lines of the country. The Weald is typical of these areas, whose structure, at first sight simple enough, reveals on closer study much complexity of the minor folding and faulting and also gives evidence of long continued movement along certain lines; movement contemporaneous with the deposition of beds which were involved in the final crescendo of tectonic activity.

scholarly journals FEATURES OF TECTONIC DEVELOPMENT OF STRUCTURES IN THE MIDDLE OB BY CORRELATION OF THICKNESS ANALYSIS

2018 ◽  
pp. 77-83
Author(s):  
F. Z. Khafizov
Keyword(s):  
Correlation Analysis ◽  
Middle Jurassic ◽  
Large Scale ◽  
Upper Cretaceous ◽  
Tectonic Activity ◽  
Active Tectonic ◽  
History Of ◽  
Tectonic Development

The article is devoted to the main patterns of tectonic development in the Middle Ob for the period from the tops of the middle Jurassic to the Eocene. It is shown that during this period of time in the tectonic development of the territory there were periods of quiet sedimentation and very active tectonic activity. In the history of the tectonic development of the Middle Ob four major stages are distinguished: two is quiet (the Jurassic and the Upper Cretaceous) and two are very active with large-scale multidirectional movements that led to a significant increase in the amplitudes of the structures (from the Cretaceous to the roof of the Cenomanian century).The article describes the methodology of the correlation analysis used in the study of the history of tectonic development in the territory.

Tectonic history of the central Humber Zone, western Newfoundland Appalachians: post-Taconian deformation in the Old Man's Pond area

1991 ◽  
Vol 28 (3) ◽  
pp. 398-410 ◽  
Author(s):  
John W. F. Waldron ◽  
John V. Milne
Keyword(s):  
Shear Zones ◽  
Tectonic Activity ◽  
Middle Ordovician ◽  
Tectonic History ◽  
Basement Rocks ◽  
Crenulation Cleavage ◽  
Shelf Sediments ◽  
History Of ◽  
Detachment Surface ◽  
Normal Sense

In the Humber Zone of the west Newfoundland Appalachians, the Middle Ordovician Taconian orogeny led to emplacement of the Humber Arm and other allochthons above a rift and shelf succession of late Precambrian to Early Ordovician age. Later deformation reversed this stacking in the Old Man's Pond area, where shelf sediments are thrust over the Old Man's Pond Group. East-vergent folds were subsequently developed in association with a regional, west-dipping cleavage that overprints the Taconian structures and intensifies eastward. Later, a major episode of shearing along normal-sense, northwest-dipping shear zones juxtaposed the Old Man's Pond Group against metamorphosed rift-related sediments and volcanics of the Hughes Lake Slice. This extensional episode may be related to intrusive events in adjacent central Newfoundland. The shear zones are overprinted by "cross folds," west-vergent folds, crenulation cleavage, and thrusts. These late structures are inferred to be related to westward transport of the rift–shelf succession and the Grenville-age basement rocks of the Long Range massif above a detachment surface, probably in Devonian time. The structural history is difficult to reconcile with a single, Devonian, "Acadian" orogeny, but is consistent with published isotopic data from central Newfoundland that suggest continued protracted tectonic activity in the Humber Zone in Silurian time.

scholarly journals Seismotectonic analysis of the Viraayots–Karabakh zone (Armenia) and the adjacent areas of Lesser Caucasus

2021 ◽  
Vol 12 (1) ◽  
pp. 157-165
Author(s):  
K. S. Ghazaryan ◽  
R. S. Sargsyan
Keyword(s):  
Wide Spectrum ◽  
Seismic Energy ◽  
Tectonic Activity ◽  
Seismic Events ◽  
Activity Levels ◽  
Tectonically Active ◽  
History Of ◽  
Tectonic Development ◽  
Lesser Caucasus ◽  
Structural Blocks

The territory of Armenia, although relatively small, is geologically and tectonically complex. Its complexity is not only due to a dense network of faults. It results from a complicated history of tectonic development including several phases of mountain formation and planation, and the extensive development of fold-block, tectonic and magmatic processes. An important scientific task is identification of earthquake-prone structural blocks by analysing seismotectonic data on geotectonic zones in Armenia. This article describes the seismotectonic analysis of geological and geophysical data on the Viraayots-Karabakh zone.We used a wide spectrum of modern tectonic-geomorphological indices and GIS technologies in order to assess the neotectonic (Neogene – Quaternary) activity of the main block units of the study area and to classify the block units by their tectonic activity levels. Tectonics of the study area is contrasting, and many tectonically active blocks are in the immediate neighbourhood with passive blocks.Based on the records of seismic events of various magnitudes and historic earthquake data, we analysed modern seismicity of the block units. For each block, a quantitative analysis of its total seismic energy release was performed, and relationships between the released seismic energy values and the number of recorded earthquakes were analyzed. Based on such analysis, we identify a group of blocks wherein the total released seismic energy values are high, but the numbers of seismic events recorded in these blocks are rather limited. In the context of block tectonic activity, analysing these data makes it possible to detect the blocks with the highest probability of the occurrence of strong earthquakes.

Inherited structure as a control on late Paleozoic and Mesozoic exhumation of the Tarbagatai Mountains, southeastern Kazakhstan

2021 ◽  
pp. jgs2020-121
Author(s):  
Jack Gillespie ◽  
Stijn Glorie ◽  
Gilby Jepson ◽  
Fedor Zhimulev ◽  
Dmitriy Gurevich ◽  
...  
Keyword(s):  
Central Asia ◽  
Tectonic Activity ◽  
Late Paleozoic ◽  
Content Type ◽  
Existing Structures ◽  
Tectonic History ◽  
History Of ◽  
Supplementary Material ◽  
Intracontinental Deformation ◽  
Insight Into

Central Asia hosts the Tianshan, the largest intracontinental mountain belt in the world, which experienced major reactivation and uplift since the Oligocene in response to the collision of India with Asia. This reactivation was focused around pre-existing structures inherited from the Paleozoic tectonic history of the region. The significant Cenozoic tectonic reworking of Central Asia complicates efforts to understand earlier phases of intracontinental tectonics during the late Paleozoic and Mesozoic. The Tarbagatai Mountains of eastern Kazakhstan record a thermotectonic history that provides insight into the timing and distribution of intracontinental tectonic activity in Central Asia prior to the India-Eurasia collision. Apatite fission track and (U-Th-Sm)/He analysis of igneous samples from the Tarbagatai Mountains reveals two episodes of cooling as a result of exhumation following Paleozoic amalgamation. Initial intracontinental deformation during the Late Permian drove exhumation synchronous with activity along newly formed strike-slip faults spanning the Central Asian Orogenic Belt. The major Chingiz-Tarbagatai Fault was reactivated during the Early Cretaceous, driving localised exhumation along the fault. The relative lack of Cenozoic tectonic activity in the Tarbagatai Mountains means they provide unique insight into the broader thermotectonic evolution of Central Asia during the late Paleozoic and Mesozoic.Supplementary material: Detailed thermochronological data, including plots and tables can be found in the supplementary data https://doi.org/10.6084/m9.figshare.c.5414555.

scholarly journals New geochemical data on fossil wood from the Albian of the Dolomites (Southern Alps, Italy)

2012 ◽  
Vol 63 (5) ◽  
pp. 399-405 ◽  
Author(s):  
Alexander Lukeneder ◽  
Achim Bechtel ◽  
Reinhard Gratzer
Keyword(s):  
Lower Cretaceous ◽  
Hydrocarbon Composition ◽  
Southern Alps ◽  
Geochemical Data ◽  
Tectonic History ◽  
The Family ◽  
History Of ◽  
Drift Wood ◽  
Wood Fragment

Abstract Information is provided about organic-matter bearing sediments and fossil drift-wood from the Puez area (Col de Puez, Southern Alps) near Wolkenstein (S. Tyrol, Italy). The locality is located on the Trento Plateau which represents a submarine high during the Lower Cretaceous. Its terpenoid hydrocarbon composition indicates that the wood fragment derived from a conifer belonging to the family Podocarpaceae or Araucariaceae. Intense degradation of OM argues for lengthier drifting. Long-term drifting is also indicated by the infestation of the bivalve Teredo (“shipworm”). The finding of a fossil tree trunk sheds some light on the early Lower Cretaceous tectonic history of the Trento Plateau and the Dolomites.

scholarly journals Paleostress reconstruction of faults recorded in the Niedźwiedzia Cave (Sudetes): insights into Alpine intraplate tectonic of NE Bohemian Massif

2021 ◽  
Author(s):  
Artur Sobczyk ◽  
Jacek Szczygieł
Keyword(s):  
Central Europe ◽  
Bohemian Massif ◽  
Tectonic Activity ◽  
Principal Stresses ◽  
Basin Inversion ◽  
Cave System ◽  
Tectonic History ◽  
Fault Block ◽  
Riedel Shear ◽  
History Of

AbstractBrittle structures identified within the largest karstic cave of the Sudetes (the Niedźwiedzia Cave) were studied to reconstruct the paleostress driving post-Variscan tectonic activity in the NE Bohemian Massif. Individual fault population datasets, including local strike and dip of fault planes, striations, and Riedel shear, enabled us to discuss the orientation of the principal stresses tensor. The (meso) fault-slip data analysis performed both with Dihedra and an inverse method revealed two possible main opposing compressional regimes: (1) NE–SW compression with the formation of strike-slip (transpressional) faults and (2) WNW–ESE horizontal compression related to fault-block tectonics. The (older) NE-SW compression was most probably associated with the Late Cretaceous–Paleogene pan-regional basin inversion throughout Central Europe, as a reaction to ongoing African-Iberian-European convergence. Second WNW–ESE compression was active as of the Middle Miocene, at the latest, and might represent the Neogene–Quaternary tectonic regime of the NE Bohemian Massif. Exposed fault plane surfaces in a dissolution-collapse marble cave system provided insights into the Meso-Cenozoic tectonic history of the Earth’s uppermost crust in Central Europe, and were also identified as important guiding structures controlling the origin of the Niedźwiedzia Cave and the evolution of subsequent karstic conduits during the Late Cenozoic.

scholarly journals Dating tectonic activity in the Lepontine Dome and Rhone-Simplon Fault regions through hydrothermal monazite-(Ce)

Solid Earth ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 199-222 ◽  
Author(s):  
Christian A. Bergemann ◽  
Edwin Gnos ◽  
Alfons Berger ◽  
Emilie Janots ◽  
Martin J. Whitehouse
Keyword(s):  
Secondary Ion Mass Spectrometry ◽  
Normal Fault ◽  
Tectonic Activity ◽  
Locality Record ◽  
Data Set ◽  
Tectonic History ◽  
Younger Age ◽  
History Of ◽  
Individual Grains ◽  
Lepontine Dome

Abstract. Zoned hydrothermal monazite-(Ce) from Alpine-type fissures and clefts is used to gain new insights into the tectonic history of the Lepontine Dome in the Central Alps and the timing of deformation along the Rhone-Simplon Fault zone on the dome's western end. Hydrothermal monazites-(Ce) (re)crystallization ages directly date deformation that induces changes in physicochemical conditions of the fissure or cleft fluid. A total of 480 secondary ion mass spectrometry (SIMS) spot analyses from 20 individual crystals, including co-type material of the monazite-(Nd) type locality, record ages for the time of ∼19 to 2.7 Ma, with individual grains recording age ranges of 2 to 7.5 Myr. The combination of these age data with geometric considerations and spatial distribution across the Lepontine region gives a more precise young exhumation history for the area. At the northeastern and southwestern edges of the Lepontine Dome, units underwent hydrothermal monazite-(Ce) growth at 19–12.5 and 16.5–10.5 Ma, respectively, while crystallization of monazite-(Ce) in the eastern Lepontine Dome started later, at 15–10 Ma. Fissure monazite-(Ce) along the western limit of the dome reports younger ages of 13–7 Ma. A younger age group around 8–5 Ma is limited to fissures and clefts associated with the Simplon normal fault and related strike-slip faults such as the Rhone Fault. The data set shows that the monazite-(Ce) age record directly links the fluid-induced interaction between fissure mineral and host rock to the Lepontine Dome's evolution in space and time. A comparison between hydrothermal monazite-(Ce) and thermochronometric data suggest that hydrothermal monazite-(Ce) dating may allow us to identify areas of slow exhumation or cooling rates during ongoing tectonic activity.

Tectonic History of Hoop Fault Complex, Barents Sea/Norway

2020 ◽  
Author(s):  
Volker Schuller ◽  
István Dunkl ◽  
Zsolt Schleder ◽  
Eirik Stueland
Keyword(s):  
Barents Sea ◽  
Early Stage ◽  
Upper Jurassic ◽  
Late Triassic ◽  
Tectonic Activity ◽  
Burial Depth ◽  
Seismic Section ◽  
Accommodation Space ◽  
Tectonic History ◽  
History Of

<p>The Barents Sea consists of several tectonic elements which were formed at different plate tectonic collisional and rifting stages. This work focuses on the Early Mesozoic to recent events of the central Barents Sea, the eastern edge of the Bjarmaland platform.</p><p>We have analysed the clastic deposits of Mid-Triassic to Upper Jurassic to reconstruct the tectonic history of the Hoop Fault Complex, Barents Sea/Norway. Apatite fission track and (U-Th)/He thermochronology were used to determine the maximum burial depths and exhumation history. According to the combined evaluation of results from shale ductility analysis (BIB-SEM), fault kinematic analysis and structural modelling (section balancing based on a 125 km long 2D seismic section line) the following tectonic evolution can be drawn: deflation of late Palaeozoic salt deposits was initiated by the tectonic activity on the early structures of the Hoop Fault zone. The orthogonal faults of the Hoop Fault Complex developed at the early stage, during Late Triassic to Early Jurassic times at relatively shallow depth, below 1000m. Ongoing subsidence related to the extension caused by the opening of the Atlantic Ocean created accommodation space for Upper Jurassic to Cenozoic deposits with maximum burial depth of 2000 m for the analysed Mid-Jurassic rocks. The exhumation of the Hoop Fault complex started around 10 Ma and remained constant until Quaternary times (140 m/Myr).</p>

Tectonic history of the Dent Blanche

2017 ◽  
Vol 9 (2.1) ◽  
pp. 1-73 ◽  
Author(s):  
Paola Manzotti ◽  
Michel Ballèvrei
Keyword(s):  
Tectonic History ◽  
History Of
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