Reply to Comment on “The Keisarhjelmen detachment records Silurian-Devonian extensional collapse in Northern Svalbard”

Terra Nova ◽  
2018 ◽  
Vol 30 (4) ◽  
pp. 322-324
Author(s):  
Alvar Braathen ◽  
Per Terje Osmundsen ◽  
Harmon Maher ◽  
Morgan Ganerød
Keyword(s):  
Extensional Collapse

An extensional collapse model for the Lhasa–Qiangtang orogen in Central Tibet

2021 ◽  
Vol 89 ◽  
pp. 66-87
Author(s):  
An-Bo Luo ◽  
Ming Wang ◽  
Xiao-Wen Zeng ◽  
Yu-Jie Hao ◽  
Hang Li
Keyword(s):  
Collapse Model ◽  
Central Tibet ◽  
Extensional Collapse

scholarly journals Middle Triassic trachytic lava flows associated with coeval dyke swarm in the North Patagonian Massif: A postorogenic magmatism related to extensional collapse of the Gondwanide orogen

2017 ◽  
Vol 75 ◽  
pp. 134-143 ◽  
Author(s):  
Santiago N. González ◽  
Gerson A. Greco ◽  
Ana M. Sato ◽  
Eduardo J. Llambías ◽  
Miguel A.S. Basei ◽  
...  
Keyword(s):  
Middle Triassic ◽  
Lava Flows ◽  
Dyke Swarm ◽  
The North ◽  
Extensional Collapse

scholarly journals Kinematics, deformation partitioning and late Variscan magmatism in the Agly massif, Eastern Pyrenees, France

2020 ◽  
Vol 191 ◽  
pp. 15 ◽  
Author(s):  
Jonas Vanardois ◽  
Pierre Trap ◽  
Philippe Goncalves ◽  
Didier Marquer ◽  
Josselin Gremmel ◽  
...  
Keyword(s):  
Cross Sections ◽  
Shear Zones ◽  
Geological Mapping ◽  
Deformation Pattern ◽  
Detailed Structural Analysis ◽  
Eastern Pyrenees ◽  
Structural Work ◽  
Tectonic Forces ◽  
Orogenic Plateau ◽  
Extensional Collapse

In order to constrain the finite deformation pattern of the Variscan basement of the Agly massif, a detailed structural analysis over the whole Agly massif was performed. Our investigation combined geological mapping, reappraisal of published and unpublished data completed with our own structural work. Results are provided in the form of new tectonic maps and series of regional cross-sections through the Agly massif. At variance from previous studies, we identified three deformation fabrics named D1, D2 and D3. The D1 deformation is only relictual and characterized by a broadly northwest-southeast striking and eastward dipping foliation without any clear mineral and stretching lineation direction. D1 might be attributed to thickening of the Variscan crust in a possible orogenic plateau edge position. The D2 deformation is a heterogeneous non-coaxial deformation, affecting the whole massif, that produced a shallowly dipping S2 foliation, and an anastomosed network of C2 shear zones that accommodated vertical thinning and N20 directed extension. D2 is coeval with LP-HT metamorphism and plutonism at ca. 315–295 Ma. D2 corresponds to the extensional collapse of the partially molten orogenic crust in a global dextral strike-slip at the scale of the whole Variscan belt. The D2 fabrics are folded and steepened along a D3 east-west trending corridor, called Tournefort Deformation Zone (TDZ), where the Saint-Arnac and Tournefort intrusives and surrounding rocks share the same NE-SW to E-W subvertical S3 foliation. Along the D3 corridor, the asymmetrical schistosity pattern and kinematic criteria suggest a D3 dextral kinematics. The D3 deformation is a record of E-W striking dextral shearing that facilitated and localized the ascent and emplacement of the diorite and granitic sheet-shaped plutons. D3 outlasted D2 and turned compressional-dominated in response to the closure of the Ibero-Armorican arc in a transpressional regime. The progressive switch from D2 thinning to D3 transpression is attributed to the lessening of gravitational forces at an advanced stage of extensional collapse that became overcome by ongoing compressional tectonic forces at the southern edge of the Variscan orogenic plateau.

scholarly journals Building the Pamir-Tibet Plateau-Crustal stacking, extensional collapse, and lateral extrusion in the Pamir: 3. Thermobarometry and petrochronology of deep Asian crust

Tectonics ◽  
2017 ◽  
Vol 36 (9) ◽  
pp. 1743-1766 ◽  
Author(s):  
Bradley R. Hacker ◽  
Lothar Ratschbacher ◽  
Daniel Rutte ◽  
Michael A. Stearns ◽  
Nicole Malz ◽  
...  
Keyword(s):  
Tibet Plateau ◽  
Lateral Extrusion ◽  
Extensional Collapse
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