Paleozoic metamorphism in the Qinling orogen, Tongbai Mountains, central China

Zhai, Xiaoming; Day, Howard W.; Hacker, Bradley R.; Zhang, You

doi:10.1130/0091-7613(1998)026<0371:pmitqo>2.3.co;2

Cited by 201 publications

(116 citation statements)

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“…Several models have been proposed in the literature that are based on different time constraints for the amalgamation of the North and South China (Yangtze) blocks (e.g., Mattauer et al, 1985;Hsü et al, 1987;Zhang, 1988 Huang and Wu, 1992;Yin and Nie, 1993;Zhang et al, 1995a;Zhang, 1999, 2000). Pre-Devonian or Early Silurian collision of the North and South China blocks was inferred from evidence of Carboniferous strike-slip faulting along the Shandan suture between the North and South Qinling terranes (Mattauer et al, 1985) and from Early Devonian crustal shortening and metamorphism recorded in granulitic rocks exposed in the Tongbai terrane (Kröner et al, 1993;Zhai et al, 1998). In contrast, Şengör (1985) and Hsü et al (1987) favored a Late Triassic collision of the North and South China blocks.…”

Section: Discussionmentioning

confidence: 99%

“…During the Late Proterozoic, the evolution of the Yangtze block was associated with magmatic-metamorphic events especially along the northern and western margins (e.g., Chen et al, 2003a, b;Rowley et al, 1997;Xue et al, 1997;Hacker et al, 1998). The southern margin of the North China block, in turn, was characterized by Early Paleozoic magmatism and metamorphism (e.g., Kröner et al, 1993;Zhai et al, 1998;Zhang, 1999, 2000). Hence, it has been argued that the sedimentary rocks of the lowgrade metamorphic zone originated from the North Qinling and South Qinling terranes, which record different crustal evolution and belong to different geological provinces (Chen et al, 2003a).…”

Section: Discussionmentioning

confidence: 99%

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Single-grain detrital muscovite Rb-Sr isotopic composition as an indicator of provenance for the Carboniferous sedimentary rocks in northern Dabie, China

et al. 2009

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Low-grade metamorphic Paleozoic sedimentary rocks are exposed along the northern margin of the Qinling-Dabie orogenic belt that formed by the collision of the North and South China blocks during the Early Mesozoic. Geological provenance and tectonic setting of these low-grade sedimentary rocks are strongly debated. Recent studies have shown that they contain Paleozoic, Late Proterozoic and Late Archean detrital zircons, which points to an origin from different sources including rocks from the South and North China blocks. This study presents single-grain mineral Rb-Sr results for detrital muscovites and biotites from Carboniferous sedimentary sequences of the Beihuaiyang low-grade metamorphic zone exposed along the northern margin of the Dabie Mountains. About 15% of detrital muscovite grains are phengitic in composition with high Si/Al ratios of >3.3. Single grain Rb-Sr isotopic analyses show that both muscovites and phengites give a pooled age of about 420 Ma, implying Middle Paleozoic thermal and high-pressure metamorphic events in the source area(s). Rb-Sr isotopic evidence from detrital biotites suggests at least two different sedimentary sources of old crustal rocks and juvenile material. The latter probably comprised magmatic rocks related to the Paleozoic convergence along the southern margin of the North China block. Whole-rock Sm-Nd isotopic composition of the sedimentary rocks also demonstrates a mixture of sedimentary sources of different ages that confirm conclusions proposed previously from evidence of detrital zircon ages. We conclude that the Paleozoic detrital phengites originate from Paleozoic subduction and subsequent collision proposed for the North Qinling terrane. Our study shows that, single-grain detrital mica Rb-Sr isotopic characteristics can be a potential indicator for the provenance of geological complex terranes.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Single-grain detrital muscovite Rb-Sr isotopic composition as an indicator of provenance for the Carboniferous sedimentary rocks in northern Dabie, China

et al. 2009

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“…Palaeozoic granites (Lerch et al 1995;Xue et al 1996a) and mafic intrusive rocks (Liu et al 2009a) are also restricted in the North Qinling region to the north of the Shangdan suture . These events occurred ∼180-200 million years earlier than the metamorphic age of blueschists in the Xinyang Group (Zhai et al 1998) and eclogites in the Huwan Group (Sun et al 2002c) in the east section of the orogenic belt along the Palaeozoic suture. There are neither metamorphic nor magmatic events of similar age (400-500 million years) to the south of the Shangdan suture Sun et al 2002b).…”

Section: Tectonic Evolution Of the Qinling Orogenic Belt And Mo Minermentioning

confidence: 97%

Formation of the world's largest molybdenum metallogenic belt: a plate-tectonic perspective on the Qinling molybdenum deposits

Wang

Hao

et al. 2011

International Geology Review

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Qinling ore belt is the largest known molybdenum belt in the world with a total reserve of >5 Mt of Mo metal. Based on the geochemical behaviour of Mo, the structural settings of the Qinling orogenic belt, and geological events in eastern China, we propose that tectonic settings are of critical importance to the formation of these ore deposits. Molybdenum is very rare in the earth with an abundance of ∼0.8 ppm in the continental crust. Both surface-and magmatic-hydrothermal enrichment processes are required for Mo mineralization. It can be easily oxidized to form water-soluble MoO 4 -in the surface environment, especially in the Phanaerozoic, and then precipitated under anoxic conditions. Therefore, closed or semi-closed water bodies with large catchment areas and high chemical erosion rates are the most favourable locations for Mo-enriched sediments. The Qinling orogenic belt was located in the tropics during crustal collisions, such that the chemical erosion was presumably intense, whereas the Erlangping back-arc basin was probably a closed or semi-closed water body as a result of plate convergence. More than 90% of the Mo reserves so far discovered in the Qinling molybdenum belt are associated with the Palaeozoic Erlangping back-arc basin. Compiled Re-Os isotopic ages for porphyry deposits (including several carbonate vein deposits) that have been dated show peaks during 220 million years (>0.32 Mt), 145 million years (> 3.5 Mt), and 115 million years (> 0.84 Mt), which correlate well with the three major episodes of granitoid magmatism since the Triassic. The ∼220 million year episode of mineralization, represented by the Huanglongpu carbonate vein-type deposit and the Wenquan porphyry deposit, coincided with the formation of the South Qinling syn-orogenic granites as well as the Dabie ultrahigh-pressure metamorphic rocks, suggests a genetic relationship with the collision between South and North China Blocks. The ∼145 Ma porphyry Mo deposits, representing the main mineralization, are attributed to reactivation by ridge subduction along the lower Yangtze River belt to the east of the Qinling orogen ∼150-140 Ma. The ∼115 Ma Mo deposits likely reflect slab rollback of the northwestwards subducting Pacific plate ∼125-110 Ma.

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“…tion history since the Paleozoic. The proof of Paleozoic deformation is the hornblende 40 Ar/ 39 Ar ages of 402±4 Ma from mylonitic schistosities [15] and 404±4 Ma, 316±1 Ma, 304±14 Ma from the Qinling and Xinyang Groups in the DMB and ZFB [18] . Collected from foliation belts and with good test precision, these samples have definite structural meanings, proving that a widespread tectonic event happened between 400 and 300 Ma.…”

Section: Structural Deformation Stagesmentioning

confidence: 99%

Geometry, kinematics and evolution of the Tongbai orogenic belt

Shaoying

Wang

et al. 2006

SCI CHINA SER D

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The Tongbai orogenic belt (TOB) is composed of six tectonic units. From south to north these units are: Tongbai gneiss rise (TGR); Hongyihe-Luozhuang eclogite belt (HLE); Maopo-Hujiazhai igneous rock belt (MHI); Zhoujiawan flysch belt (ZFB); Yangzhuang greenschist belt (YGB); and Dongjiazhuang marble belt (DMB).The geometry and kinematic images of the TOB include: the antiformal structures caused by a later uplift process, the top-to-north ductile shear structure that related to a process that the ultrahigh pressure rocks are brought to surface, the top-to-south ductile shear thrust and the sinistrial shear structures related to a south-north direction compression, and the east-west direction fold structures in the upper crust. In the view of the multistage subduction-collision orogenic belt, according to the characters of petrology and its distribution, geometry, kinematics and structural chronology in these tectonic units, tectonic evolution of the TOB can be divided into four stages: oceanic crust subduction during 400-300 Ma, continental collision during 270-250 Ma, continental deep subduction and uplift during 250-205 Ma and doming deformation during 200-185 Ma.

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Paleozoic metamorphism in the Qinling orogen, Tongbai Mountains, central China

Cited by 201 publications

References 16 publications

Single-grain detrital muscovite Rb-Sr isotopic composition as an indicator of provenance for the Carboniferous sedimentary rocks in northern Dabie, China

Single-grain detrital muscovite Rb-Sr isotopic composition as an indicator of provenance for the Carboniferous sedimentary rocks in northern Dabie, China

Formation of the world's largest molybdenum metallogenic belt: a plate-tectonic perspective on the Qinling molybdenum deposits

Geometry, kinematics and evolution of the Tongbai orogenic belt

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