scholarly journals Postcollisional granitoids and aptian-albian extension in tectonic evolution of Chukotka mesozoides, Northeast Russia

2019 ◽  
Vol 484 (3) ◽  
pp. 329-334
Author(s):  
M. V. Luchitskaya ◽  
S. D. Sokolov ◽  
V. E. Verzhbitsky ◽  
E. V. Vatrushkina ◽  
A. V. Ganelin ◽  
...  
Keyword(s):  
Tectonic Evolution ◽  
Sedimentary Environment ◽  
Northeast Russia ◽  
Granitoid Magmatism ◽  
Tectonic Regime ◽  
Tectonic Events ◽  
Structural Style ◽  
Basin Formation ◽  
Amerasian Basin ◽  
South Anyui Suture

New U–Pb SIMS zircon datings from granitoid plutons and dikes of Western Chukotka together with earlier obtained data confirm that postcollisional granitoid magmatism and dike intrusion occurred in Aptian–Albian (117–105 m.y.) and fix change of tectonic regime from collision to extension in tectonic evolution of Chukotka Mesozoides. These events may be related to continuing expansion of Amerasian basin since Jurassic and forma- tion in Aptian—Albian time of both oceanic Makarov, Podvodnikov basins and Anakhurgen, Nutesyn and Kameshkov basins in continental framework of Eastern Arctic. Synchronism of tectonic events of extension and spreading in the Canada Basin and collisional events, deformations and reorganization of structural style and sedimentary environment in the South-Anyui suture is noted. This may be regarded as confirmation of rotation hypothesis of Amerasian Basin formation.

scholarly journals Lithospheric weakening during “retroforeland” basin formation: Tectonic evolution of the central South Alpine foredeep

Tectonics ◽  
1998 ◽  
Vol 17 (1) ◽  
pp. 131-142 ◽  
Author(s):  
Giovanni Bertotti ◽  
Vincenzo Picotti ◽  
Sierd Cloetingh
Keyword(s):  
Tectonic Evolution ◽  
Basin Formation ◽  
Central South

Tectonic Evolution of the Yangtze Tectonic Regime

1989 ◽  
pp. 513-549
Author(s):  
Zhang Qinwen ◽  
Qu Jingchuan ◽  
Chen Bingwei
Keyword(s):  
Tectonic Evolution ◽  
Tectonic Regime

Shale Gas Preservation Conditions in South Anhui of Lower Yangtze Area

2014 ◽  
Vol 998-999 ◽  
pp. 1458-1461
Author(s):  
Jiang Hua Chen
Keyword(s):  
Shale Gas ◽  
Tectonic Evolution ◽  
Stable Distribution ◽  
Burial Depth ◽  
Core Analysis ◽  
Thermal Maturity ◽  
Tectonic Events ◽  
High Maturity ◽  
Preservation Conditions ◽  
Yangtze Area

There are good shales well developed in the study area with significant thickness and stable distribution. The study area is estimated to have a big potential for shale gas. However, the study area experienced three major phases of tectonic events and thus developed severe folds and big faults. From the outcrop study and core analysis information of some old geological wells, the thermal maturity of shale is quite high up to 4%. Graphitization is observed in lower Cambrian which acting as another indicator of high maturity. Study released that this may link to the tectonic evolution (volcanic activities) and deep burial depth. Therefore, the preservations conditions of shale gas in the study area would be a key point for the success of exploration.

Sedimentology and structure of the trench-slope to forearc basin transition in the Mesozoic of Alexander Island, Antarctica

1993 ◽  
Vol 130 (6) ◽  
pp. 737-754 ◽  
Author(s):  
P. A. Doubleday ◽  
D. I. M. Macdonald ◽  
P. A. R. Nell
Keyword(s):  
Sedimentary Rocks ◽  
Accretionary Prism ◽  
Coarse Grained ◽  
Accretionary Complex ◽  
Forearc Basin ◽  
Marine Transgression ◽  
Tectonic Events ◽  
The World ◽  
Basin Formation ◽  
Trench Slope

AbstractThe Mesozoic forearc of Alexander Island, Antarctica, is one of the few places in the world where the original stratigraphic relationship between a forearc basin and an accretionary complex is exposed. Newlydiscovered sedimentary rocks exposed at the western edge of the forearc basin fill (the Kimmeridgian–Albian Fossil Bluff Group) record the events associated with the basin formation. These strata are assigned to the newly defined Selene Nunatak Formation (?Bathonian) and Atoll Nunataks Formation (?Bathonian-Tithonian) within the Fossil Bluff Group.The Selene Nunatak Formation contains variable thicknesses of conglomeratesand sandstones, predominantly derived from the LeMay Group accretionary complex upon which it is unconformable. The formation marks emergence and subsequent erosion of the inner forearc area. It is conformably overlain by the1 km thick Atoll Nunataks Formation, characterized by thinly-bedded mudstones and silty mudstones representing a marine transgression followed by trench-slope deposition. The Atoll Nunataks Formation marks a phase of subsidence, possibly in response to tectonic events in the accretionary prism that are known to have occurred at about the same time.The Atoll Nunataks Formation is conformably overlain by the Himalia Ridge Formation, a thick sequence of basin-wide arc-derived conglomerates. This transition from fine- to coarse-grained deposition suggests that a well-developed depositional trough (and hence trench-slope break) had formed by that time. The Atoll Nunataks Formation therefore spans the formation of the forearc basin, and marks the transition from trench-slope to forearc basin deposition.

Petroleum exploration model for the Queen Charlotte Basin area, offshore British Columbia

1993 ◽  
Vol 30 (5) ◽  
pp. 918-927 ◽  
Author(s):  
Henry V. Lyatsky ◽  
James W. Haggart
Keyword(s):  
Lower Jurassic ◽  
Petroleum Exploration ◽  
Petroleum Potential ◽  
Thermal Anomalies ◽  
Structural Style ◽  
Basin Formation ◽  
New Interpretation ◽  
And Migration ◽  
Block Structures ◽  
Basin Area

A potential oil-bearing region lies on the west coast of Canada, in the Queen Charlotte Basin area. Upper Triassic – Lower Jurassic source and Cretaceous reservoir rocks are capped by thick Tertiary volcanic and sedimentary strata. The traps are large block structures, and oil generation and migration took place principally in the Tertiary.Previous hypotheses of Queen Charlotte Basin evolution assumed high regional Tertiary heat flow and large tectonic extension; older rocks would have been overheated, and their oil destroyed. New data largely nullify such an interpretation. Miocene positive thermal anomalies were caused by magmatism, hence were local, and Mesozoic rocks may have retained their petroleum prospects. Regional structural style of the area has been dominated by repeated movements of fault-bounded crustal blocks since the Late Jurassic, and the structure of the Cenozoic basin was inherited largely from this older template.The new interpretation of the geologic evolution of the region permits a fresh assessment of its petroleum potential: Cretaceous strata beneath Queen Charlotte Sound are a prime exploration target. Caution is recommended when quantitative basin-formation models are applied to oil exploration; the best exploration model is one that incorporates the maximum geological and geophysical data.

scholarly journals Correlation of magmatic and tectonic events in the evolution of the West Chukotka ophiolites

2019 ◽  
Vol 486 (2) ◽  
pp. 202-207
Author(s):  
A. V. Ganelin ◽  
S. D. Sokolov
Keyword(s):  
Arctic Ocean ◽  
Tectonic Evolution ◽  
Late Jurassic ◽  
Early Carboniferous ◽  
The West ◽  
Tectonic Events ◽  
Geodynamic Processes

The article is an overview of the magmatic and geodynamic processes that formed Aluchin and Gromadnen-Vurguvem ophiolites in the territory of Western Chukotka. The ophiolites formed into a convergent system between the Siberian continent and the Proto-Arctic Ocean. In the tectonic evolution of this system, important milestones have been identified: the Early Carboniferous, the Later Triassic and the Late Jurassic.

Sign in / Sign up

Export Citation Format

Share Document