Vorticity analysis of the Palmi shear zone mylonites: new insights for the Alpine tectonic evolution of the Calabria-Peloritani terrane (southern Italy)

2015 ◽  
Vol 51 (4) ◽  
pp. 670-681 ◽  
Author(s):  
Vincenzo Festa ◽  
Giacomo Prosser ◽  
Alfredo Caggianelli ◽  
Antonietta Grande ◽  
Antonio Langone ◽  
...  
Keyword(s):  
Shear Zone ◽  
Tectonic Evolution ◽  
Southern Italy ◽  
Vorticity Analysis

Structural interpretation and tectonic evolution of a part of the Najd Shear Zone (Saudi Arabia) using Landsat thematic-mapper data

1990 ◽  
Vol 178 (2-4) ◽  
pp. 309-335 ◽  
Author(s):  
Ian J. Duncan ◽  
Benoit Rivard ◽  
Raymond E. Arvidson ◽  
Mohamed Sultan
Keyword(s):  
Saudi Arabia ◽  
Shear Zone ◽  
Tectonic Evolution ◽  
Thematic Mapper ◽  
Landsat Thematic Mapper ◽  
Structural Interpretation ◽  
Thematic Mapper Data

Quartz textural analysis from an anastomosing shear zone system: Implications for the tectonic evolution of the Ribeira belt, Brazil

2020 ◽  
Vol 103 ◽  
pp. 102750
Author(s):  
T. Conte ◽  
C. Cavalcante ◽  
L.E. Lagoeiro ◽  
H. Fossen ◽  
C.S. Silveira
Keyword(s):  
Shear Zone ◽  
Tectonic Evolution ◽  
Textural Analysis

Geochronology, geochemistry, and Hf–Sr-Nd isotopes of the Hamisana Shear Zone granitoids in northeastern Sudan: Petrogenesis and tectonic evolution of neoproterozoic juvenile crust in the Nubian Shield

2020 ◽  
Vol 347 ◽  
pp. 105857
Author(s):  
Adil Saeed ◽  
Zuoxun Zeng ◽  
Yildirim Dilek ◽  
S.F. Awadelseid ◽  
A.A. Abdel Rahman ◽  
...  
Keyword(s):  
Shear Zone ◽  
Tectonic Evolution ◽  
Nd Isotopes ◽  
Nubian Shield ◽  
Juvenile Crust

Two Paleoproterozoic metamorphic events in the Zhujiafang ductile shear zone of the Hengshan Complex: Insights into the tectonic evolution of the North China Craton

2020 ◽  
Author(s):  
Jiahui Qian
Keyword(s):  
Shear Zone ◽  
North China Craton ◽  
Tectonic Evolution ◽  
North China ◽  
Shear Zones ◽  
Ductile Shear Zone ◽  
Garnet Amphibolite ◽  
Inclusion Type ◽  
Mineral Assemblages ◽  
Ductile Shear

<p>Ductile shear zones <span>usually record mineralogical and isotopic changes that are not apparent in the surrounding host rocks and thus may preserve a complete evolutionary record in a single locale from relatively undeformed to highly deformed rocks. </span>The Zhujiafang ductile shear zone is situated in the central Hengshan Complex, a key area for understanding the Paleoproterozoic tectonic evolution of the Trans-North China Orogen, North China Craton. Detailed metamorphic and geochronological analyses were carried out on metapelite and garnet amphibolite from the Zhujiafang ductile shear zone. The metapelite preserves two phases of mineral assemblages: early kyanite-rutile-bearing assemblage and late chlorite-staurolite-bearing assemblage in garnet–mica schist, and inclusion-type muscovite (high-Si) + kyanite assemblage and late sillimanite-bearing assemblage in sillimanite–mica gneiss. Garnet in the metapelite occasionally exhibits pronounced two-stage zoning characteristic of a diffusion core with irregular pyrope (X<sub>py</sub>) and grossular (X<sub>gr</sub>) contents and a growth rim with X<sub>py</sub> and X<sub>gr</sub> increasing outwards. The isopleths of the maximum X<sub>gr</sub> in garnet core and Si content in inclusion-type muscovite in the P–T pseudosections suggest that the early mineral assemblages underwent medium-high-pressure type metamorphism with pressures up to 12–14 kbar at 700–750 °C. The late assemblages and the growth zoning of garnet rim predict a late separated clockwise P–T path with peak conditions of 6.5 ± 0.2 kbar/620 ± 10 °C (medium-low-pressure type). The garnet amphibolite is mainly composed of garnet, hornblende, plagioclase, ilmenite and quartz, without overprinting of late mineral assemblages except for localized corona textures. Phase modeling suggests that the rock has experienced high-amphibolite facies metamorphism with peak conditions of 10.5 ± 0.8 kbar/770 ± 50 °C, which is broadly consistent with the early-phase metamorphism of metapelite. Zircon U–Pb dating on metapelite yields two metamorphic age groups of 1.96–1.92 Ga and 1.87–1.86 Ga which are interpreted to represent the timing of the two separated phases of metamorphism. Two separated orogenic events may have occurred respectively at ~1.95 Ga and ~1.85 Ga in the Hengshan–Wutai area. The older orogeny was resulted from continental collision and the younger one may be caused by within-plate deformation. The final exhumation of the high-grade rocks formed in the older (i.e. 1.95 Ga) orogeny should be related with the younger deformation/metamorphic event. For more details, please refer to <span>https://doi.org/10.1016/j.lithos.2019.02.001.</span></p>

U-Pb Isotope Geochronology and Granitic Gneisses Nanoparticles from the Xiaomei Shear Zone: Implication for Caledonian Tectonic in the Hainan Island, China

2020 ◽  
Vol 12 (1) ◽  
pp. 39-47
Author(s):  
Zhou Yang ◽  
Shen Baoyun ◽  
Liu Hailing ◽  
Yan Yi ◽  
Yan Yan
Keyword(s):  
Shear Zone ◽  
Tectonic Evolution ◽  
Frictional Heating ◽  
Hainan Island ◽  
Ductile Shear Zone ◽  
Spherical Nanoparticles ◽  
Pb Isotope ◽  
Tectonic Event ◽  
Isotope Geochronology ◽  
Early Devonian

U-Pb ages of zircons from the granitic gneisses in the Xiaomei shear zone, Hainan Island, provide constraints on the age of granitic gneisses and tectonic evolution of Caledonian orogeny in Hainan Island. Zircons extracted from granitic gneisses are rounded and subrounded and characterized by oscillatory overgrowths enclosing inherited cores. The Early Devonian (414–411 Ma) ages of inherited zircons from the Xiaomei granitic gneisses are consistent with tectonic event that uplifted the Hainan island, resulting in the absence of Devonian strata. Meanwhile, nanoparticles are found in the granitic gneisses, including agglomerated nanoparticles and spherical nanoparticles in the ductile shear zone. The spherical nanoparticles in the shear zone are believed to have experienced a two-stage formation, from the linear spherical nanoparticles to planar spherical nanoparticles. With rise in temperature due to frictional heating during the shearing, spherical nanoparticles are deformed to agglomerated nanoparticles and the inherited zircons probably are recrystallized at 411 Ma.

scholarly journals The Main Shear Zone in Sør Rondane, East Antarctica: Implications for the late-Pan-African tectonic evolution of Dronning Maud Land

Tectonics ◽  
2015 ◽  
Vol 34 (6) ◽  
pp. 1290-1305 ◽  
Author(s):  
Antonia S. Ruppel ◽  
Andreas Läufer ◽  
Joachim Jacobs ◽  
Marlina Elburg ◽  
Nicole Krohne ◽  
...  
Keyword(s):  
Shear Zone ◽  
Tectonic Evolution ◽  
East Antarctica ◽  
Pan African ◽  
Dronning Maud Land

On the tectonic evolution of the Ligurian accretionary complex in southern Italy

2011 ◽  
Vol 124 (3-4) ◽  
pp. 463-483 ◽  
Author(s):  
S. Ciarcia ◽  
S. Mazzoli ◽  
S. Vitale ◽  
M. Zattin
Keyword(s):  
Tectonic Evolution ◽  
Southern Italy ◽  
Accretionary Complex

scholarly journals Strike-slip reactivation of a Paleogene to Miocene fold and thrust belt along the central part of the Mid-Hungarian Shear Zone

2010 ◽  
Vol 61 (6) ◽  
pp. 483-493 ◽  
Author(s):  
Márton Palotai ◽  
László Csontos
Keyword(s):  
Shear Zone ◽  
Seismic Data ◽  
Tectonic Evolution ◽  
Strike Slip ◽  
3D Seismic ◽  
Thrust Belt ◽  
Clockwise Rotation ◽  
Fold And Thrust Belt ◽  
Detailed Interpretation ◽  
3D Seismic Data

Strike-slip reactivation of a Paleogene to Miocene fold and thrust belt along the central part of the Mid-Hungarian Shear ZoneRecently shot 3D seismic data allowed for a detailed interpretation, aimed at the tectonic evolution of the central part of the Mid-Hungarian Shear Zone (MHZ). The MHZ acted as a NW vergent fold and thrust belt in the Late Oligocene. The intensity of shortening increased westwards, causing clockwise rotation of the western regions, relatively to the mildly deformed eastern areas. Blind thrusting and related folding in the MHZ continued in the Early Miocene. Thrusting and gentle folding in the MHZ partly continued in the earliest Pannonian, and was followed by sinistral movements in the whole MHZ, with maximal displacement along the Tóalmás zone. Late Pannonian inversion activated thrusts and generated transpressional movements along the Tóalmás zone.

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