The Guadalupian (Permian) Gufeng Formation on the North Margin of the South China Block: A Review of the Lithostratigraphy, Radiolarian Biostratigraphy, and Geochemical Characteristics

2019 ◽  
Vol 23 (4) ◽  
pp. 261 ◽  
Author(s):  
Tsuyoshi Ito ◽  
Koji U. Takahashi ◽  
Atsushi Matsuoka ◽  
Qinglai Feng
Keyword(s):  
South China ◽  
Geochemical Characteristics ◽  
South China Block ◽  
The South ◽  
The North ◽  
Radiolarian Biostratigraphy

Provenance of Carboniferous strata (the Meishan Group) on the northern margin of the Dabie orogenic belt and implications of oblique convergence between the North and South China blocks

2021 ◽  
Vol 91 (9) ◽  
pp. 1010-1023
Author(s):  
Cheng Cheng ◽  
Shuangying Li ◽  
Xiangyang Xie ◽  
Yanlin Lu ◽  
Arthur B. Busbey ◽  
...  
Keyword(s):  
South China ◽  
Orogenic Belt ◽  
South China Block ◽  
The South ◽  
North China Block ◽  
Northern Margin ◽  
The North ◽  
Dabie Orogenic Belt ◽  
Oblique Convergence ◽  
North And South

ABSTRACT The newly defined Carboniferous Meishan Group, along the northern margin of the Dabie orogenic belt, provides unique opportunities to document the poorly understood Paleozoic tectonic evolution of the Dabie orogenic belt and the Paleozoic convergence between the North and South China blocks. We apply sandstone petrology, geochemistry, and U-Pb detrital-zircon geochronology to constrain the provenance of the Carboniferous Meishan Group and to document its potential tectonic significance. We conclude that the Meishan Group received most sediment directly from early Paleozoic continental island arc rocks that are currently missing in the Dabie orogenic belt, with minor contributions from middle Neoproterozoic magmatic rocks of the South China Block and recycling of Archean to Proterozoic basement rocks of both the North and South China blocks. Compilation and comparison of detrital zircons and geochemistry data of the Silurian–Devonian and Carboniferous units suggests that all of them share similar source areas, but that individual contributions from each source were different. These results support the hypothesis that the Dabie orogenic belt developed a similar Paleozoic accretionary system, and shares a similar tectonic history, with the Qinling orogenic belt. These provenance patterns can be explained by a model of oblique convergence between the North and South China blocks during the Paleozoic. The South China Block was obliquely subducted beneath the North China Block with its opening to the east, forming an eastward-widening sedimentary basin. As a result, the eastern part of the basin received more sediment from the northern passive margin of the South China Block, while the western part of the basin received more material from the southern active margin of the North China Block.

Mesozoic Hydrothermal Overprint on Carboniferous Bauxite in China

2020 ◽  
Author(s):  
Ruixue Wang ◽  
Qingfei Wang ◽  
I. Tonguç Uysal ◽  
Erick Ramanaidou ◽  
Jun Deng ◽  
...  
Keyword(s):  
Organic Matter ◽  
Raman Spectra ◽  
South China ◽  
Intensity Ratio ◽  
North China ◽  
South China Block ◽  
The South ◽  
North China Block ◽  
The North ◽  
North And South

Abstract Bauxite is the world’s main source of aluminum and typically consists of gibbsite, boehmite, and minor amounts of diaspore. However, bauxite deposits from the North and South China blocks consist mostly of diaspore and associated minerals, including anatase and illite. Much of this illite is authigenic and occurs as three polytypes (1M, 1Md, and 2M1), with Kübler indices ranging from 0.23 to 0.47 indicating precipitation temperatures of 175° to 300°C. The Raman spectra of anatase show an intensity ratio of <1.5 for G (~1,600 cm–1) and D bands (~1,350 cm–1) diagnostic of organic matter, suggesting its presence during bauxite sedimentation followed by heating (165° to 270°C). The K-Ar ages of authigenic illite from the South China block (178–137 Ma) and the North China block (214–203 Ma) are synchronous with known regional Mesozoic tectono-thermal events generating hydrothermal overprints resulting in (1) the formation of illite, (2) the conversion of some diaspores from thermal of gibbsite and boehmite, and (3) the heating of anatase postsedimentation of the Carboniferous bauxites.

Tectonic evolution of the Paleo-Tethys Ocean in Southwest Guangxi: evidence from acidic magmatic rocks in the Pingxiang area, SW China

2021 ◽  
Author(s):  
Wenmin Huang ◽  
Xijun Liu ◽  
Zhenglin Li ◽  
Bing Zhao ◽  
Yiying Han
Keyword(s):  
Partial Melting ◽  
South China ◽  
South China Block ◽  
Guangxi Province ◽  
The South ◽  
Crustal Rocks ◽  
The North ◽  
Early Mesozoic ◽  
Innovation Project ◽  
Tethys Ocean

<p>Early Mesozoic development of Southeast Asia involved oceanic subduction, closure, accretion and collision of discrete terranes rifted from Gondwana. South China, as an important continental terrane, is bound to the north by the Qinling-Dabie collisional orogenic belt, to the south by the Indochina Block, and to the east by the Pacific Plate. The role of continental collision and subduction during the Early Mesozoic development of South China has sparked the interest of geologists worldwide and stimulated considerable research. The Triassic tectonic history of the southwestern South China Block is marked by the Indosinian orogeny that records amalgamation of the Indochina and South China blocks during the late Permian to Triassic as a result of closure of the eastern branch of the Paleo-Tethys Ocean. In South China, there is widespread granitic magmatism, metamorphism and deformation. The closure of eastern Paleo-Tethys Ocean and subsequent collision between the South China block and Indochina Block has caused the collision zone metamorphism and formation of granites during the Permo-Triassic, with the Song Ma fault zone as the collision boundary. The Indosinian magmatism in the Pingxiang region was the magmatic products in this period. We report the new results of bulk-rock major and trace element, Nd, Hf isotopic compositions and zircon U–Pb dating of granites and rhyolites in the Pingxiang region in Guangxi Province, Southwest China, to decipher their petrogenesis and tectonic settings. The granites and rhyolitics in the Pingxiang area have low Mg<sup>#</sup> values (11.1–36.7), low Nb/Ta ratios (9.26–13.74) exhibiting a both affinity from S-type to I-type granaite. The isotopic features of these rocks show negative ε<sub>Hf</sub>(t) with the values ranging from -9.89 to -6.09, negative ε<sub>Nd</sub>(t) values ranging from -12.89 to -12.02 and T<sub>2DM</sub> values of 1.8–3.3 Ga, suggesting that the Pingxiang granites and rhyolites was derived from partial melting of paleoproterozoic crust rocks. The granites yielded <sup>206</sup>Pb/<sup>238</sup>U ages ranging from 243 to 241 Ma, and the rhyolites yielded <sup>206</sup>Pb/<sup>238</sup>U ages ranging from 247 to 245 Ma, which are both within the age range of the subduction to collision. Combine the regional geology, we suggest these granitoids and rhyolites were formed by the partial melting of crustal rocks during a transition from subduction to post-collisional environment with closure of Paleo-Tethys Ocean between the South China block and Indochina Block.</p><p>This study was financially supported by Guangxi Natural Science Foundation for Distinguished Young Scholars (2018GXNSFFA281009) and the Fifth Bagui Scholar Innovation Project of Guangxi Province (to XU Ji-feng).</p>

Spatio-temporal evolution and dynamic origin of Jurassic-Cretaceous magmatism in the South China Block

2021 ◽  
Vol 217 ◽  
pp. 103605
Author(s):  
Xianzhi Cao ◽  
Nicolas Flament ◽  
Sanzhong Li ◽  
R. Dietmar Müller
Keyword(s):  
South China ◽  
Temporal Evolution ◽  
South China Block ◽  
The South ◽  
Spatio Temporal ◽  
Cretaceous Magmatism

scholarly journals Thrusting, exhumation and basin fill on the western margin of the South China block during India-Asian collision

2018 ◽  
Author(s):  
Kai Cao ◽  
Guocan Wang ◽  
Philippe Hervé Leloup ◽  
Wei Mahéo ◽  
Yadong Xu ◽  
...  
Keyword(s):  
South China ◽  
South China Block ◽  
The South ◽  
Western Margin ◽  
Basin Fill

Triassic two-stage intra-continental orogensis of the South China Block, driven by Paleotethyan closure and interactions with adjoining blocks

2021 ◽  
Vol 206 ◽  
pp. 104648
Author(s):  
Yuejun Wang ◽  
Yang Wang ◽  
Yuzhi Zhang ◽  
Peter A. Cawood ◽  
Xin Qian ◽  
...  
Keyword(s):  
South China ◽  
South China Block ◽  
The South ◽  
Two Stage
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