Oblique lineations in orthogneisses and supracrustal rocks: vertical partitioning of strain in a hot crust (eastern Borborema Province, NE Brazil)

Neves, Sérgio P.; Silva, José Maurício Rangel da; Mariano, Gorki

doi:10.1016/j.jsg.2005.02.002

Cited by 42 publications

(28 citation statements)

References 63 publications

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“…An angle of about 109 or 110 is expected to be a reliable indicator of ductile shear and has been increasingly reported in the literature (Neves et al, 2005;Guo et al, 2006;Marshak et al, 2006;Zheng et al, 2006;Yang et al, 2007;King et al, 2008;Fowler and Osman, 2009;Zhang et al, 2010). The angles between the conjugate shear bands provided by Kurz and Northrup (2008) show that all of them, either in high-strained or in low-strained rocks, fall into the range predicted by the MEM Criterion (the four vertical dotted-lines in Fig.…”

Section: Mem-criterionmentioning

confidence: 77%

A challenge to the concept of slip-lines in extrusion tectonics

Zheng

Wang

Zhang

et al. 2011

Geoscience Frontiers

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Wide-open V-shaped conjugate strike-slip faults in Asia are typically related to extrusion tectonics. However, the tectonic model based on the slip-line theory of plasticity has some critical problems associated with it. The conjugate sets of slip-lines in plane deformation, according to the theory of plasticity should be normal to each another but, in reality, the angles between the conjugate strike-slip faults, which are regarded as slip-lines in extrusion tectonics in the eastern Mediterranean, Tibet-middle Asia, China and the Indochina Peninsular regions, are always more than 90 (on average w110 ) in the direction of contraction. Another problem is that the slip-line theory fails to explain how, in some cases, e.g., in the Anatolian area in the eastern Mediterranean, the extrusion rate is much higher than the indent rate. The two major problems are easy to solve in terms of the Maximum-Effective-Moment (MEM) Criterion that predicts that orientations of the shear zones are theoretically at an angle of 54.7 and practically at angles of 55 AE10 with the s 1 -or contractional direction. The orientations of the strike-slip faults that accommodate extrusion tectonics are, therefore, fundamentally controlled by the MEM Criterion. When extrusion is along the MEM-orientations, the extruding rate is normally higher than the indenting rate. ª 2011, China University of Geosciences (Beijing) and Peking University. Production and hosting by Elsevier B.V. All rights reserved.

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Section: Mem-criterionmentioning

confidence: 77%

A challenge to the concept of slip-lines in extrusion tectonics

Zheng

Wang

Zhang

et al. 2011

Geoscience Frontiers

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“…In fact, the push of the Arabian plate, in terms of rates, is about half of the rates or less as compared to the movement of Anatolia (McClusky et al, 2000). This can also be explained by maximum effective moment criterion (Zheng et al, 2009(Zheng et al, , 2004Neves et al, 2005), which is the relationship between effective moment generated by differential stress of material and the orientation of fault with respect to σ 1 direction. Given a value of the differential stress, the maximum value of the effective moment appears in the orientation of -54.7°.…”

Section: Implications For Continental Deformationmentioning

confidence: 99%

Modeling the contemporary stress field and deformation pattern of eastern Mediterranean

Dwivedi

Hayashi

2010

J. Earth Sci.

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The contemporary stress field in the earth's crust is important and provides insights into mechanisms that drive plate motions. In this study, elastic plane stress finite element modeling incorporating realistic rock parameters was used to calculate the stress field, displacement field, and deformation of the plate interactions in the eastern Mediterranean. Modeled stress data for the AfricanArabian-Anatolian plate interactions with fixed European platform correlate well with observed contemporary stress indicator from the world stress map (WSM) and focal mechanism of earthquakes; while displacement field agrees qualitatively well with GPS vectors and sense of motion indicated by focal mechanisms for large crustal earthquakes (M s >6) and plate motion models. Modeling result shows the direction of maximum horizontal compressive stress (σ Hmax ) toward the direction of absolute motionof these plates. Large perturbations in σ Hmax orientations are shown to occur in and around tectonic boundaries between those plates. It is observed that, although the African plate acts mostly as indenter, which transmits the collisional motion from the Arabian plate to the Anatolian plate, in the current situation, the far-field stress, probably from the subduction in Aegean Arc, is needed to satisfy the contemporary stress field in Anatolia.

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“…The angle of 82° exists between convergent direction and plate boundary. Motion of Luonan-Luanchuan convergent belt is subduction and sinistral strike-slip, similar to the convergent mode of many orogenic belts in the world [13][14][15][16][17][18][19][20][21][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45][46][47] .…”

Section: Analysis Of Convergence Factormentioning

confidence: 99%

“…Based on partitioning of structural deformation of the LLTB, we use macroscale and microscale structures to analyze convergent direction and mode, determine convergence factors [13][14][15][16][17][18][19][20][21] and formation time of the LLTB, and provide new evidence for a better understanding of accretion of the continent.…”

mentioning

confidence: 99%

The constraints of strain partitioning and geochronology in Luonan-Luanchuan tectonic belts on Qinling orogenic belt

Song

Zhang

Wang

et al. 2009

Sci. China Ser. D-Earth Sci.

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The Luonan-Luanchuan tectonic belt lies between the North China Block and QinlingMountains, including the Luonan-Luanchuan fault zone and the strong deformation zone to the north of the fault. The ductile shear zone, imbricate brittle fault and duplex structure in the fault zone now are the expression of the same tectonic event in different depth. Such lineation structure exists in the tectonic belts as mineral lineation, elongation lineation, crenulation lineation, sheath folds and so on, indicating NE-directed plate motion. Fold axes and thrusts in the strong deformation zone are inclined to the Luonan-Luanchuan fault zone at small angles. The structures with different natures show a regular pattern, produced during oblique convergence of plates. The convergence factors are as follows：The direction of plate convergence is 22°, 31° and the angle between the plate convergence direction and plate boundary is 73°, 82° respectively in the west and east segment. The Luonan-Luanchuan tectonic belt was deformed strongly in 372 Ma, resulted from Erlangping back-arc ocean basin subduction sinistrally and obliquely to North China Block during the collision of North China Block and South China Block.

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Oblique lineations in orthogneisses and supracrustal rocks: vertical partitioning of strain in a hot crust (eastern Borborema Province, NE Brazil)

Cited by 42 publications

References 63 publications

A challenge to the concept of slip-lines in extrusion tectonics

A challenge to the concept of slip-lines in extrusion tectonics

Modeling the contemporary stress field and deformation pattern of eastern Mediterranean

The constraints of strain partitioning and geochronology in Luonan-Luanchuan tectonic belts on Qinling orogenic belt

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