Mianl�e tectonic zone and Mianl�e suture zone on southern margin of Qinling-Dabie orogenic belt

Zhang, Guowei; Dong, Yunpeng; Lai, Shaocong; Guo, Anlin; Meng, Qing‐Ren; Liu, Shaofeng; Shunyou, Cheng; Anping, Yao; Zongqing, Zhang; Pei, Xianzhi; Li, Sanzhong

doi:10.1360/02yd0526

Cited by 167 publications

(124 citation statements)

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“…Regarding to the key factors that affect and control the formation of the Dabashan thrust nappe, there are mainly four opinions: 1) the uplift at both ends of the Bashan Arc fault is main mechanism (Jiang et al, 1982;Guo et al, 1996;Wang et al, 2003;Zhang et al, 2004;Dong et al, 2010;Xu et al, 2010;Shi et al, 2012); 2) tectonic extension at the margin of paleo-contiental and irregular boundary are the decisive factors , the dextral shear induced by the inconsistent morphology of the continental margins also plays a key role (He et al, 1997); 3) the arc-shaped fault that has been formed in the early stage of tectonic extension controls the thrust nappe developed toward southwest (Wang et al, , 2013; 4) the detachment layers under Dabashan unit is the main formation condition (Wang et al, , 2013.…”

Section: Discussionmentioning

confidence: 99%

The geological and geodynamic condition on the formation of the Dabashan thrust nappe structure: Based on FLAC numerical modelling

Zhang¹,

Dong²

2016

Earth sci. res. j.

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The Dabashan thrust nappe structure at the southern margin of the Qinling orogenic belt suffered at least two stages of evolution which are Late Triassic plate subduction collisional orogeny between North China block, Qinling micro-plate and Yangtze block followed by intracontinental orogeny since the Meso-Cenozoic. A prominent topography characteristic within the Dabashan area is a southwestward extrusive arc (Bashan Arc fault) that is one of key factors to understand the geodynamic condition of the Dabashan thrust nappe structure.In this work, two-dimensional plan-view models are constructed to simulate the collisional and intracontinental orogenic movements, and the factors that may control the formation of the Bashan Arc fault are analysed. The modelling results show that the compressive stress produced by the plates collision along both north and south boundaries is the main driving force. The dextral shearing derived from the inconsistent shape on the block margins is the main controller. Rigid tectonic units such as Bikou and Hanan-Micangshan terranes, Foping and Wudang domes, as well as Shennongjia-Huangling anticline also contribute as "anchor" effects. Additionally, the rheology properties of rock material in the Dabashan area affect the shape of the arc.La estructura de la falla de cabalgamiento de las montañas Dabashan en el margen sur del cinturón orogénico de Qinling sufrió por lo menos dos etapas de evolución, la colisión orogénica del Triásico Superior entre el bloque de la China del Norte, la microplaca de Qinling y el bloque Yangtze, y la orogénesis intracontinental desde el Meso-Cenozoico. Una característica topográfica prominente del área de Dabashan es un arco extrusivo (falla Arco de Bashan) hacia el suroeste, que es un factor determinante para entender la condición geodinámica de la falla de cabalgamiento en las montañas Dabashan. En este trabajo se construyeron modelos bidimensionales planos para simular los movimientos de colisión e intracontinental orogénicos y se analizaron los factores que podrían controlar la formación de la falla del Arco de Bashan. Los resultados del modelado muestran que el esfuerzo de compresión producido por las placas de colisión en los límites norte y sur es la principal fuerza impulsora de la falla. La principal controladora es la fuerza de cizallamiento dextral derivada de la forma inconsistente en los margenes del bloque. Las unidades tectónicas rígidas como los terrenos Bikou y HananMicangshan, el domo Foping y Wudang, al igual que el anticlinal Shennongjia-Huangling tienen funciones de ancla. Adicionalmente, las propiedades reológicas del material rocoso en el área Dabashan afectan la forma del arco. Condición geológica y geodinámica para la formación estructural de la falla de cabalgamiento en las montañas Dabashan basada en el modelo numérico del software FLAC B2 Xiaoning Zhang and Yunpeng Dong. ABSTRACT RESUMEN

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Section: Discussionmentioning

confidence: 99%

The geological and geodynamic condition on the formation of the Dabashan thrust nappe structure: Based on FLAC numerical modelling

Zhang¹,

Dong²

2016

Earth sci. res. j.

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“…The Dabie ultra-high-pressure metamorphic (UHPM) belt is the middle part of the Qinling-Dabie-Sulu Mountains in China (Mattauer et al 1985;Zhang 1999, 2000;Sun et al 2002a;Li and Yang 2003;Zhang et al 2004), which is the largest UHPM belt in the world and resulted from the Triassic collision between the North and South China blocks (Figure 1a and b) (Li et al 1993;Hacker et al 1998;Liou et al 2000;Ye et al 2000;Sun et al 2002b;Zhang et al 2003Zhang et al , 2008Liu et al 2006;Yang et al 2008).…”

Section: The Dabie Mountainsmentioning

confidence: 99%

Different origins of adakites from the Dabie Mountains and the Lower Yangtze River Belt, eastern China: geochemical constraints

Ling

Wang

Ding

et al. 2010

International Geology Review

131

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“…To the north, the zone is separated by the east Kunlun fault from the east Kunlun massif and to the south, it borders with the BayankalaSongpan-Garzê massif along the Changshitoushan fault. Tectonically, the A'nyemaqen ophiolite mélange zone is situated in between the western Qinling-eastern Kunlun orogen and the Yangtze plate, and represents the west-extended constitution of the Mianlue suture zone [10] ( Figure 1). …”

Section: Regional Geologymentioning

confidence: 99%

Geochemistry and spatial distribution of OIB and MORB in A’nyemaqen ophiolite zone: Evidence of Majixueshan ancient ridge-centered hotspot

et al. 2007

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The mafic volcanic association is made up of OIB, E-MORB and N-MORB in the A'nyemaqen Paleozoicophiolites. Compared with the same type rocks in the world, the mafic rocks generally display lower Nb/U and Ce/Pb ratios and some have Nb depletion and Pb enrichment. The OIB are LREE-enriched with (La/Yb) N =5-20, N-MORB are LREE-depleted with (La/Yb) N = 0.41-0.5. The OIB are featured by incompatible element enrichment and the N-MORB are obviously depleted with some metasomatic effect, and E-MORB are geochemically intermediated. These rocks are distributed around the Majixueshan OIB and gabbros in a thickness greater than a thousand meters and transitionally change along the ophiolite extension in a west-east direction, showing a symmetric distribution pattern as centered by the Majixueshan OIB, that is, from N-MORB, OIB and E-MORB association in the Dur'ngoi area to OIB in the Majixueshan area and then to N-MORB, OIB and E-MORB assemblage again in the Buqingshan area. By consideration of the rock association, the rock spatial distribution and the thickness of the mafic rocks in the Majixueshan, coupled with the metasomatic relationship between the OIB and MORB sources, it can be argued that the Majixueshan probably corresponds to an ancient hotspot or an ocean island formed by mantle plume on the A'nyemaqeh ocean ridge, that is the ridge-centered hotspot, tectonically similar to the present-day Iceland hotspot.A'nyemaqen ophiolite zone, OIB, N-MORB and E-MORB association, spatial distribution, Majixueshan ridge-centered hotspot, metasomatism, mantle plume Coexistence of normal mid-ocean-ridge basalts (N-MORB), enriched mid-ocean-ridge basalts (E-MORB) and ocean island basalts (OIB) in the certain tectonic setting has drawn extensive attention and strong interest. Iceland in the North Atlantic Ocean has become a well-known example for the phenomenon. The phenomenon has been thought to be a result of superposition of a hotspot on a ridge (ridge-centered hotspot) [1] or an oceanic island on a ridge (ridge-centered island) [2] or a mantle plume on a ridge (plume on-ridge) [3] , and hotspot-ridge interaction or plume-ridge interaction [4,5] . The spatial superposition and materials interaction between a ridge and a hotspot or an ocean island or a plume cause anomalies of geochemistry, topography, crustal structure, gravity, seismic velocity and bathymetry in the area surrounding a ridge-hotspot [1] .Recent studies have indicated that the coexistence not only occurs in a modern environment like Iceland, but also can be traced into ophiolite zones representing preserved oceanic crust in continental orogenic belts. Hou et al. [6,7] , according to the coexistence of OIB, N-MORB and T-MORB and their specific configuration in space, proposed a paleo-Tethyan mantle plume model to inter-

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Mianl�e tectonic zone and Mianl�e suture zone on southern margin of Qinling-Dabie orogenic belt

Cited by 167 publications

References 17 publications

The geological and geodynamic condition on the formation of the Dabashan thrust nappe structure: Based on FLAC numerical modelling

The geological and geodynamic condition on the formation of the Dabashan thrust nappe structure: Based on FLAC numerical modelling

Different origins of adakites from the Dabie Mountains and the Lower Yangtze River Belt, eastern China: geochemical constraints

Geochemistry and spatial distribution of OIB and MORB in A’nyemaqen ophiolite zone: Evidence of Majixueshan ancient ridge-centered hotspot

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