An Early Paleoproterozoic back-arc system along the southern margin of the Yinshan Block: Evidence from a newly-defined bimodal volcanic sequence in the Daqingshan Complex, Khondalite Belt

2021 ◽  
Vol 321 (6) ◽  
pp. 708-738
Author(s):  
Xiao Wang ◽  
Jian Zhang ◽  
Changqing Yin ◽  
Hai Zhou ◽  
Jin Liu ◽  
...  
Keyword(s):  
Southern Margin ◽  
Volcanic Sequence ◽  
Back Arc ◽  
Khondalite Belt

Incipient Charnockites from the Southern Margin of the Kerala Khondalite Belt

2000 ◽  
Vol 3 (4) ◽  
pp. 552-554
Author(s):  
K. Sreeraj ◽  
M. Santosh ◽  
H. Wada
Keyword(s):  
Southern Margin ◽  
Kerala Khondalite Belt ◽  
Khondalite Belt

scholarly journals Plio-Quaternary tectonic evolution of the southern margin of the Alboran Basin (Western Mediterranean)

2019 ◽  
Author(s):  
Manfred Lafosse ◽  
Elia d'Acremont ◽  
Alain Rabaute ◽  
Ferran Estrada ◽  
Martin Jollivet-Castelot ◽  
...  
Keyword(s):  
Fault Zone ◽  
Western Mediterranean ◽  
Strike Slip ◽  
Term Evolution ◽  
Southern Margin ◽  
Constant Direction ◽  
Tectonic Inversion ◽  
Alboran Basin ◽  
Back Arc

Abstract. Progresses in understanding the sedimentary dynamic of the Western Alboran Basin lead us to propose a model of evolution of its tectonic inversion since the Pliocene to present-time. Extensive and strike-slip structures accommodate the Miocene back-arc extension of the Alboran Basin, but undergo progressive tectonic inversion since the Tortonian. Across the Alboran Basin, the Alboran Ridge becomes a transpressive structure accommodating the shortening. We map its southwestern termination: a Pliocene rhombic structure exhibiting series of folds and thrusts. A younger structure, the Al-Idrissi fault zone (AIF), is Pleistocene to present-day active strike-slip fault zone. This fault zone crosses the Alboran Ridge and connects southward to the transtensive Nekor Basin and the Nekor fault. In the Moroccan shelf and at the edge of a submerged volcano, we date the inception of the local shelf subsidence from the 1.81–1.12 Ma. It marks the propagation of the AIF toward the Nekor Basin. Pliocene thrusts and folds and Quaternary transtension appear at first sight as different tectonic periods but reflects the long-term evolution of a transpressive system. Despite a constant direction of Africa/Eurasia convergence since 5 Ma at the scale of the southern margin of Alboran Basin, the Pliocene-Quaternary inversion evolves from transpressive to transtensive on the AIF and the Nekor Basin. This system reflects the expected evolution of the deformation of the Alboran Basin under the indentation of the African lithosphere.

Early Pleistocene (Calabrian) marine bottom oxygenation and palaeoclimate at the southern margin of the Central Anatolian Plateau

2018 ◽  
Vol 137 (3) ◽  
pp. 425-464 ◽  
Author(s):  
Nazik Öğretmen ◽  
Virgilio Frezza ◽  
Natália Hudáčková ◽  
Elsa Gliozzi ◽  
Paola Cipollari ◽  
...  
Keyword(s):  
Early Pleistocene ◽  
Anatolian Plateau ◽  
Southern Margin

Evolution of Orogenic Plateaus at Subduction Zones - Sinking and raising the southern margin of the Central Anatolian Plateau

2018 ◽  
Author(s):  
David Fernández-Blanco
Keyword(s):  
Tectonic Evolution ◽  
Subduction Zones ◽  
Inversion Tectonics ◽  
High Discharge ◽  
Anatolian Plateau ◽  
Surface Uplift ◽  
Southern Margin ◽  
Wide Range ◽  
Forearc Basins ◽  
Orogenic Plateaus

Orogenic plateaus have raised abundant attention amongst geoscientists during the last decades, offering unique opportunities to better understand the relationships between tectonics and climate, and their expression on the Earth’s surface.Orogenic plateau margins are key areas for understanding the mechanisms behind plateau (de)formation. Plateau margins are transitional areas between domains with contrasting relief and characteristics; the roughly flat elevated plateau interior, often with internally drained endorheic basins, and the external steep areas, deeply incised by high-discharge rivers. This thesis uses a wide range of structural and tectonic approaches to investigate the evolution of the southern margin of the Central Anatolian Plateau (CAP), studying an area between the plateau interior and the Cyprus arc. Several findings are presented here that constrain the evolution, timing and possible causes behind the development of this area, and thus that of the CAP. After peneplanation of the regional orogeny, abroad regional subsidence took place in Miocene times in the absence of major extensional faults, which led to the formation of a large basin in the northeast Mediterranean. Late Tortonian and younger contractional structures developed in the interior of the plateau, in its margin and offshore, and forced the inversion tectonics that fragmented the early Miocene basin into the different present-day domains. The tectonic evolution of the southern margin of the CAP can be explained based on the initiation of subduction in south Cyprus and subsequent thermo-mechanical behavior of this subduction zone and the evolving rheology of the Anatolian plate. The Cyprus slab retreat and posterior pull drove subsidence first by relatively minor stretching of the crust and then by its flexure. The growth by accretion and thickening of the upper plate, and that of the associated forearc basins system, caused by accreting sediments, led to rheological changes at the base of the crust that allowed thermal weakening, viscous deformation, driving subsequent surface uplift and raising the modern Taurus Mountains. This mechanism could be responsible for the uplifted plateau-like areas seen in other accretionary margins. ISBN: 978-90-9028673-0

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