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Geochemical features and its tectonic significance of the meta-basalt in Zhoujiawan area, Mianlue suture zone, Qinling - Dabie Mountains, Hubei Province
Abstract
The meta-basalts in Zhoujiawan area are located at the boundary tectonic melange between Qinling-Dabie microplate and Yangtze plate. The rocks were formed during Indo-Chinese epoch and belong to subalkaline tholeiite association. They show a flat REE distribution pattern and a slight LREE enrichment. The ratios of Th/Yb, Ta/Yb, Ti/Zr, Ti/Y and Nb, Th mass density indicate that the meta-basalts in this region are very similar to the MORB originated from depletive mantle of asthenosphere and imply a small initial ancient ocean tectonic setting between Qinling-Dabie and Yangtze plates during middle Paleozoic-Early Mesozoic era. This meta-basalt block should be important evidence to the south of Dabie mountain.
... Closure of the Shangdan ocean led to continent-continent collision between the North China plate and Qinling -Dabieshan plates beginning in late Paleozoic time (Zhang et al., 2001). The development and extension of the Mianlue ocean during the Late Paleozoic and the Early Triassic have been documented by ; ; Lai et al. (1997Lai et al. ( , 1998; Xu et al. (1998); Liu and Zhang (1999); Dong et al. (1999); Zhang (1999, 2000); Zhang et al. (2001). With the Permian and Early Triassic subduction and consumption of the Shangdan oceanic basin, the northern margin of the Yangtze plate extended along the Mianlue suture, and was completely separated by this suture from the Qinling-Dabieshan plate to the north. ...
... With the Permian and Early Triassic subduction and consumption of the Shangdan oceanic basin, the northern margin of the Yangtze plate extended along the Mianlue suture, and was completely separated by this suture from the Qinling-Dabieshan plate to the north. The ophiolites representing the remnants of the palaeo-oceanic crust crop out in the Mianxian-Lueyang and Suixian regions Lai et al., 1997Lai et al., , 1998Xu et al., 1998;Dong et al., 1999). A passive continental marginal basin was developed along the northern Yangtze plate (Feng, 1991;Feng et al., 1997;Liu, 1997;Liu and Zhang, 1999;Zhang et al., 2001). ...
... Location of sections A and B are shown in Fig. 1 Mianlue ocean basin and the Mesozoic foreland basin (Feng, 1991;Feng et al., 1997;Liu and Zhang, 1999) were deformed into the NYFB. A structural mélange, consisting of ophiolite remnants, island arc volcanic rocks, deepwater and forearc sediments, and basement rocks separated by ductile shear belts were locally developed between Xiangfan and Wuhan cities along the XGF (Lai et al., 1998;Dong et al., 1999). This suggests that the older Mianlue suture between the Qinling-Dabieshan and Yangtze plates is cutoff at depth below the Qinling-Dabieshan plate by the XGF (Zhang et al., 2001). ...
A Mesozoic foreland-basin complex formed along the northern Yangtze plate during subduction of this plate under the Qinling–Dabieshan orogenic belt along the Mianlue suture. As the Yangtze plate moved northwestwards and was obliquely subducted under the Qinling–Dabieshan (Middle–Late Triassic), a flysch foredeep developed in the Diebu–Songpan in the western part of the northern Yangtze plate. During the Late Triassic, a nonmarine molasse basin first formed in the eastern part of the northern Yangtze plate in response to initial collision there. This molasse clastic wedge prograded over the former marine basin and was accompanied by a change from high-sinuosity river systems flowing into basinal lakes, to higher gradient braidplains. Complete oceanic closure along the Mianlue suture during the Middle Jurassic produced a more extensive east–west molasse basin with rivers, deltas and lakes. During Late Jurassic through Early Cretaceous, the depocenter of the nonmarine molasse basin migrated continually from east to west because of intracontinental deformation associated with clockwise rotation of the Yangtze plate relative to the North China plate. In this time interval, the basin was again dominated by fluvial and lake-delta deposition and rivers continued to disperse sediments southwards into the basin.
... Closure of the Shangdan ocean led to continent-continent collision between the North China plate and Qinling -Dabieshan plates beginning in late Paleozoic time (Zhang et al., 2001). The development and extension of the Mianlue ocean during the Late Paleozoic and the Early Triassic have been documented by ; ; Lai et al. (1997Lai et al. ( , 1998; Xu et al. (1998); Liu and Zhang (1999); Dong et al. (1999); Zhang (1999, 2000); Zhang et al. (2001). With the Permian and Early Triassic subduction and consumption of the Shangdan oceanic basin, the northern margin of the Yangtze plate extended along the Mianlue suture, and was completely separated by this suture from the Qinling-Dabieshan plate to the north. ...
... With the Permian and Early Triassic subduction and consumption of the Shangdan oceanic basin, the northern margin of the Yangtze plate extended along the Mianlue suture, and was completely separated by this suture from the Qinling-Dabieshan plate to the north. The ophiolites representing the remnants of the palaeo-oceanic crust crop out in the Mianxian-Lueyang and Suixian regions Lai et al., 1997Lai et al., , 1998Xu et al., 1998;Dong et al., 1999). A passive continental marginal basin was developed along the northern Yangtze plate (Feng, 1991;Feng et al., 1997;Liu, 1997;Liu and Zhang, 1999;Zhang et al., 2001). ...
... Location of sections A and B are shown in Fig. 1 Mianlue ocean basin and the Mesozoic foreland basin (Feng, 1991;Feng et al., 1997;Liu and Zhang, 1999) were deformed into the NYFB. A structural mélange, consisting of ophiolite remnants, island arc volcanic rocks, deepwater and forearc sediments, and basement rocks separated by ductile shear belts were locally developed between Xiangfan and Wuhan cities along the XGF (Lai et al., 1998;Dong et al., 1999). This suggests that the older Mianlue suture between the Qinling-Dabieshan and Yangtze plates is cutoff at depth below the Qinling-Dabieshan plate by the XGF (Zhang et al., 2001). ...
Divergent plate-margin basins are dominantly extensional in character and commonly form initially in either mantle-generated or lithosphere-generated rift zones. Individual basins frequently undergo an evolution from syn-rift phase, with active block rotation, to a post-rift phase where more broadly based subsidence is controlled by thermal cooling. The region may eventually become a new passive continental margin. The depositional infill and resulting sedimentary architecture can be most problematic in the syn-rift phase where it is controlled largely by the interplay of fault-block geometry, rates of fault movement and drainage area characteristics, as well as climatic and sea-level changes.Within non-marine half-grabens, with the Pangean Triassic basins as prime examples, there is a generally good documentation of infill architecture, although there is still some uncertainty about the controls on the relative abundance of footwall-, hanging-wall-and axially-derived sediments. In marine half-grabens, where a sediment gravity flow association commonly dominates, there is more uncertainty about infill architecture because of the variable balance between limited sediment supply, sea-level change and fault-block tilt rates. Except in half-grabens adjacent to large and easily eroded hinterlands the volume of footwall-derived sediments is commonly overestimated. Examples of post-rift and rift–drift transition successions are discussed from the northern North Sea and Red Sea areas.
... However, the LA-ICP-MS U-Pb isotopic data from the Shicaogou syn -collisional granite in the eastern Qinling Mountains yielded an age of 925±11 Ma, indicating that Precambrian collision-amalgamation events could have occurred among some continental blocks within the Qinling orogenic belt . The Huashan ophiolitic mélange was identified recently, and was considered as the eastern part of the Mianlüe ophiolitic mélange (Dong et al., , 1999Lai et al., 1998). Shi et al. (2003) reported imprecise Sm-Nd and Rb-Sr ages for the volcanic rocks from the Yangjiapeng and Xifu area. ...
... The group is unconformably overlain by Sinian strata, and unconformably overlaps the Dagushi Group. The basic volcanic rocks were recently separated from the Huashan Group (Dong et al., 1998), and constitute the main part of the Huashan ophiolitic mélange, which was considered as the eastern part of the Mianlüe ophiolitic mélange (Dong et al., , 1999Lai et al., 1998). ...
The recently identified Huashan ophiolitic mélange was considered as the eastern part of the Mianlüe suture in the Qinling orogenic belt. SHRIMP zircon U-Pb geochronology on gabbro from the Huashan ophiolite and granite intruding basic volcanic rocks indicates crystallization ages of 947 ± 14 Ma and 876 ± 17 Ma respectively. These ages do not support a recently proposed Hercynian Huashan Ocean, but rather favor that a Neoproterozoic suture assemblage (ophiolite) is incorporated into the younger (Phanerozoic) Qinling orogenic belt.
... The Mianlue suture zone is a composite tectonic zone that formed from the Qinling-Dabieshan subduction-collision suture and was superimposed by Mesozoic and Cenozoic intracontinental structures . Most parts of this suture zone are cut at a depth below the Qinling-Dabieshan micro-plate by the Chengkou-Xiangfan fault thrust (F1) , and its development and extension have been documented by , , Lai et al. (1997Lai et al. ( , 1998, Xu et al. (1998), Dong et al. (1999), and Zhang et al. (2001). The ophiolites that represent the remnants of the paleooceanic crust, associated island-arc volcanics and bimodal volcanics crop out in the towns of Mianxian-Lueyang in western Qinling. ...
... The Mianlue suture zone is a composite tectonic zone that formed from the Qinling-Dabieshan subduction-collision suture and was superimposed by Mesozoic and Cenozoic intracontinental structures . Most parts of this suture zone are cut at a depth below the Qinling-Dabieshan micro-plate by the Chengkou-Xiangfan fault thrust (F1) , and its development and extension have been documented by , , Lai et al. (1997Lai et al. ( , 1998, Xu et al. (1998), Dong et al. (1999), and Zhang et al. (2001). The ophiolites that represent the remnants of the paleooceanic crust, associated island-arc volcanics and bimodal volcanics crop out in the towns of Mianxian-Lueyang in western Qinling. ...
The southern Qinling–Dabieshan foreland fold-thrust belt is a key region inwhich to investigate the continental–
continental collision between North China and South China. We provide structural evidence of a diachronous
dextral strike-slip thrusting deformation from the Middle Triassic in the east to the late Late Triassic in the
west, which indicates a northwestward oblique subduction and suturing of the South China plate under
the North China–Qinling–Dabieshan plate.We also identify a later phase of intracontinental deformation that included an orthogonal intracontinental collision and south-vergent thrusting during the Early andMiddle Jurassic, indentation of South China into the Qinling–Dabieshan Orogen and arc-shaped extrusions of the southern Qinling–Dabieshan foreland fold-thrust belt from the Late Jurassic to the Cretaceous. Our results reveal that the long-term intracontinental collision rotated clockwise in a northwest–southeast-vergent direction in the Late Triassic to northeast–east–southwest–west-vergent in the Late Cretaceous. This collision may have been driven by a north-vergent subduction of the Meso-Tethys Ocean in the south, west-vergent subduction of the Izanagi plate in the east, and south-vergent compression of the Eurasia plate in the north.
... The Mianlue suture zone is a composite tectonic zone that formed from the Qinling-Dabieshan subduction-collision suture and was superimposed by Mesozoic and Cenozoic intracontinental structures . Most parts of this suture zone are cut at a depth below the Qinling-Dabieshan micro-plate by the Chengkou-Xiangfan fault thrust (F1) , and its development and extension have been documented by , , Lai et al. (1997Lai et al. ( , 1998, Xu et al. (1998), Dong et al. (1999), and Zhang et al. (2001). The ophiolites that represent the remnants of the paleooceanic crust, associated island-arc volcanics and bimodal volcanics crop out in the towns of Mianxian-Lueyang in western Qinling. ...
The southern Qinling–Dabieshan foreland fold-thrust belt is a key region in which to investigate the continental–continental collision between North China and South China. We provide structural evidence of a diachronous dextral strike-slip thrusting deformation from the Middle Triassic in the east to the late Late Triassic in the west, which indicates a northwestward oblique subduction and suturing of the South China plate under the North China–Qinling–Dabieshan plate.We also identify a later phase of intracontinental deformation that included an orthogonal intracontinental collision and south-vergent thrusting during the Early andMiddle Jurassic, indentation of South China into the Qinling–Dabieshan Orogen and arc-shaped extrusions of the southern Qinling–Dabieshan foreland fold-thrust belt from the Late Jurassic to the Cretaceous. Our results reveal that the long-term intracontinental collision rotated clockwise in a northwest–southeast-vergent direction in the Late Triassic to northeast–east–southwest–west-vergent in the Late Cretaceous. This collision may have been driven by a north-vergent subduction of the Meso-Tethys Ocean in the south, west-vergent subduction of the Izanagi plate in the east, and south-vergent compression of the Eurasia plate in the north.
... The Mianlue suture zone is a composite tectonic zone that formed from the Qinling-Dabieshan subduction-collision suture and was superimposed by Mesozoic and Cenozoic intracontinental structures . Most parts of this suture zone are cut at a depth below the Qinling-Dabieshan micro-plate by the Chengkou-Xiangfan fault thrust (F1) , and its development and extension have been documented by , , Lai et al. (1997Lai et al. ( , 1998, Xu et al. (1998), Dong et al. (1999), and Zhang et al. (2001). The ophiolites that represent the remnants of the paleooceanic crust, associated island-arc volcanics and bimodal volcanics crop out in the towns of Mianxian-Lueyang in western Qinling. ...
The southern Qinling-Dabieshan foreland fold-thrust belt is a key region in which to investigate the continental-continental collision between North China and South China. We provide structural evidence of a diachronous dextral strike-slip thrusting deformation from the Middle Triassic in the east to the late Late Triassic in the west, which indicates a northwestward oblique subduction and suturing of the South China plate under the North China-Qinling-Dabieshan plate. We also identify a later phase of intracontinental deformation that included an orthogonal intracontinental collision and south-vergent thrusting during the Early and Middle Jurassic, indentation of South China into the Qinling-Dabieshan Orogen and arc-shaped extrusions of the southern Qinling-Dabieshan foreland fold-thrust belt from the Late Jurassic to the Cretaceous. Our results reveal that the long-term intracontinental collision rotatedclockwise in a northwest-southeast-vergent direction in the Late Triassic to northeast-east-southwest-west-vergent in the Late Cretaceous. This collision may have been driven by a north-vergent subduction of the Meso-Tethys Ocean in the south, west-vergent subduction of the Izanagi plate in the east, and south-vergent
compression of the Eurasia plate in the north.
There are a lot of the Paleozoic basic sills in the western Wudang terrain in south Qinling structural zone. The study on petrology, geochemistry and isotopic composition of Sr and Nd in this paper shows that the magma of the basic sills belongs to the tholeiite series and is from a mixed and abnormal continental lithospheric mantal-type magma resource. The basic sill swarm is one of the marks of the rifting of Wudang terrain and the middle Paleozoic underplating of mantal magma and interplayting between the mantal and crust. In addition to it, the geochemistry of basic sills is very similar to that of the tholeiite and meta-diabases in Mianlue ophiolite. Considering the differences in isotopic age of the basic sills (401 ∼ 407 Ma), the extension of Wudang terrain (425 ∼260 Ma) and the basic volcanic rocks in Mianlue suitural zone (230 Ma), the authors believe that the basic sills in the western Wudang terrain are the result from the extension and the thinning of the continental lithosphere caused by the activation of the mantal plume, and upwelling of the deep magma. So the basic sills should be a response of the early stage of opening of the Mianlue ocean.
The southern Qinling–Dabieshan foreland fold-thrust belt is a key region in which to investigate the continental–continental collision between North China and South China. We provide structural evidence of a diachronous dextral strike-slip thrusting deformation from the Middle Triassic in the east to the late Late Triassic in the west, which indicates a northwestward oblique subduction and suturing of the South China plate under the North China–Qinling–Dabieshan plate. We also identify a later phase of intracontinental deformation that included an orthogonal intracontinental collision and south-vergent thrusting during the Early and Middle Jurassic, indentation of South China into the Qinling–Dabieshan Orogen and arc-shaped extrusions of the southern Qinling–Dabieshan foreland fold-thrust belt from the Late Jurassic to the Cretaceous. Our results reveal that the long-term intracontinental collision rotated clockwise in a northwest–southeast-vergent direction in the Late Triassic to northeast–east–southwest–west-vergent in the Late Cretaceous. This collision may have been driven by a north-vergent subduction of the Meso-Tethys Ocean in the south, west-vergent subduction of the Izanagi plate in the east, and south-vergent compression of the Eurasia plate in the north.
In order to explore the disputed issue concerning the tectonic affinity of the ancient ocean mantle of North Qilian Mountains
(NQM), geochemical and Sr, Nd, Pb isotopic compositions of pillow basalts of the Yushigou Ophiolite (YSGO) suite from NQM
have been analyzed systematically. The pillow basalts exhibit tholeiitic characteristics, with flat chondrite-normalized REE
patterns ((La/Yb)N = 0.98–1.27). They display no Nb, Ta, Zr, Hf negative anomalies, and show MORB features in 2Nb-Zr/4-Y and Ti/100-Zr-Y × 3
tectonic discrimination diagrams. These results indicate that the Yushigou ophiolite is most likely to be formed in a mid-ocean
ridge or mature back-arc basin. Their isotopic data show a relatively broad and enriched 87Sr/86Sr (0.70509–0.70700), restricted 143Nd/144Nd (0.512955–0.512978). Pb isotopes are in the range of 206Pb/204Pb (18.054–20.562), 207Pb/204Pb (15.537–15.743) and 208Pb/204Pb (38.068–38.530). These isotopic data imply that the basalts originated from the depleted mantle (DMM), with the involvement
of enriched mantle components (mainly EMII). Geochemical comparisons between the basalts in YSGO and the MORB-type basalts
of ophiolite suites occurring in the known ancient Tethyan tectonic domain indicate that the ancient oceanic mantle represented
by YSGO suite forming in early Paleozoic in the North Qilian Mountains is very similar to the Tethyan mantle in both trace
elements and isotopic compositions. The North Qilian Mountains should be a part of the Tethyan tectonic domain in early Paleozoic.
This further implies that the Tethyan tectonic domain can be deduced to early Paleozoic in the study area, which will be helpful
to discussing the tectonic affinity and evolution of the North Qilian Mountains.
The geologic framework of the Qinling orogen was built up through interplay of three blocks, the North China block (including the North Qinling), the South Qinling, and the South China block, separated by the Shangdan and Mianlue sutures. The Shangdan suture resulted from Middle Paleozoic collision of the North China block and the South Qinling. The Mianlue suture resulted from Late Triassic collision of the South Qinling and the South China block. Present upper crust of the Qinling is structured dominantly by thrust–fold systems. The North Qinling displays thick-skinned deformation with crystalline basement involved, whilst the South Qinling is characterized by thin-skinned thrusts and folds detached above the Lower Sinian. Two types of Precambrian basement, crystalline and transitional, are defined according to lithology and metamorphic grade and different in age. Stratigraphic and sedimentary architecture is characterized by distinct zonation.
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