scholarly journals The Structural Framework of the Erlangping Group in North Qinling, Central China

2012 ◽  
Vol 2012 ◽  
pp. 1-7
Author(s):  
Hongyuan Zhang ◽  
Chunqiang Zhao ◽  
Fanglei Xu ◽  
Yanlong Dong
Keyword(s):  
Shear Zone ◽  
Regional Metamorphism ◽  
Central China ◽  
North China Block ◽  
Tectonic Event ◽  
The North ◽  
Structural Framework ◽  
North Qinling ◽  
Tectonic Belt

As one major unit of the North Qinling tectonic belt, and being located in the north side of the UHP belt between the Yangtze block and the North China block, the Erlangping Group has become one hot research spot because it still keeps records of both plate and inner-continent evolution histories. Three aspects of the Erlangping Group are reviewed. (1) Research history are concluded into three stages, including the determination of rock assemblages before the late 1980s, the regional metamorphism laws solution in the 1990s, and the formation time and tectonic background discussion in the 2000s. (2) Five major controversies and frontier scientific problems have been offered, such as, the deformation ages determination, the Cretaceous tectonic event definition, the determination of the deformation mechanisms and conditions, the kinematic and dynamic nature of the Zhuyangguan-Xiaguan shear zone, and the reconstruction of the evolution and exhumation history. (3) Structural framework of the Erlangping Group is divided into five parts according to our field and laboratory study, including the Erjingou slab, the Damiao-Wantan shear zone, the Huoshenmiao slab, the Xiaozhai-Erlangping shear zone, and the Baoshuping slab. Only the Xiaozhai-Erlangping shear zone has clear kinematic marks of left lateral slip.

scholarly journals Petrogenesis and Geochronology of Tianshui Granites from Western Qinling Orogen, Central China: Implications for Caledonian and Indosinian Orogenies on the Asian Plate

Minerals ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 515
Author(s):  
Muhammad Saleem Mughal ◽  
Chengjun Zhang ◽  
Amjad Hussain ◽  
Hafiz Ur Rehman ◽  
Dingding Du ◽  
...  
Keyword(s):  
Partial Melting ◽  
Saturation Index ◽  
Central China ◽  
Qinling Orogen ◽  
North China Block ◽  
Western Qinling ◽  
The North ◽  
Western Segment ◽  
Indosinian Orogeny ◽  
North Qinling

The precise timing, petrogenesis, and geodynamic significance of three granitoid bodies (Beidao granite, Caochuanpu granite, Yuanlongzhen granite, and the Roche type rock) of the Tianshui area in the Western Qinling Orogen, central China, are poorly constrained. We performed an integrated study of petrology, geochemistry, and zircon U-Pb dating to constrain their genesis and tectonic implication. Petrographic investigation of the granites shows that the rocks are mainly monzogranites. The Al saturation index (A/CNK versus SiO2) of the granitoid samples indicates meta-aluminous to peraluminous I-type granites. Their magmas were likely generated by the partial melting of igneous protoliths during the syn-collisional tectonic regime. Rare-earth-elements data further support their origin from a magma that was formed by the partial melting of lower continental crust. The Beidao, Caochuanpu, and Yuanlongzhen granites yielded U-Pb zircon weighted mean ages of 417 ± 5 Ma, 216 ± 3 Ma, and 219 ± 3 Ma, respectively. This study shows that the Beidao granite possibly formed in syn- to post-collision tectonic settings due to the subduction of the Proto-Tethys under the North China Block, and can be linked to the generally reported Caledonian orogeny (440–400 Ma) in the western segment of the North Qinling belt, whereas Yuanlongzhen and Caochuanpu granites can be linked to the widely known Indosinian orogeny (255–210 Ma). These granitoids formed due to the subduction of the oceanic lithospheres of the Proto-Tethyan Qinling and Paleo-Tethyan Qinling. The Roche type rock, tourmaline-rich, was possibly formed from the hydrothermal fluids as indicated by the higher concentrations of boron leftover during the late-stages of magmatic crystallization of the granites.

Geochronology of the transition of eclogite to amphibolite facies metamorphism in the North Qinling orogen of central China

Lithos ◽  
2011 ◽  
Vol 125 (3-4) ◽  
pp. 969-983 ◽  
Author(s):  
Hao Cheng ◽  
Chao Zhang ◽  
Jeffrey D. Vervoort ◽  
Xianhua Li ◽  
Qiuli Li ◽  
...  
Keyword(s):  
Amphibolite Facies ◽  
Central China ◽  
Qinling Orogen ◽  
The North ◽  
Facies Metamorphism ◽  
North Qinling
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