Ca. 1.04 Ga hot Grenville granites in the western Yangtze Block, southwest China

Wang, Yanjun; Zhu, Weiguang; Huang, Hongyan; Zhong, Hong; Bai, Zhiming; Fan, Hong-Peng; Yang, Yi-Jin

doi:10.1016/j.precamres.2019.04.024

Cited by 39 publications

(4 citation statements)

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“…According to regional tectonics and geodynamic background in Early-Middle Palaeozoic (Dong & Santosh, 2016;Meng & Zhang, 1999;Wu & Zheng, 2013), a variety of models have been proposed for tectonic evolution of the Qinling Orogenic Belt in recent years Hu et al, 1995aHu et al, , 1995bLiu et al, 2016;Pei et al, 2009;Ren et al, 2018;Wang et al, 2009;Wang et al, 2015;Wu et al, 2009;Wu & Zheng, 2013;Xiang et al, 2012Xiang et al, , 2014Yang et al, 2003;Zhao et al, 2015;Zhu et al, 2011 Meng & Zhang, 1999;Zhang, 1988;Zhao et al, 2015). tings (Clemens, 2006;Cui et al, 2020;Eby, 1990Eby, , 1992Huang et al, 2011;King, White, Chappell, & Allen, 1997;Li et al, 2013b;Wang et al, 2019;Whalen et al, 1987). These results suggest that a continental rift setting most likely dominated the northeastern of the North Qinling Terrane at the Early Devonian.…”

Section: Tectonic Implicationsmentioning

confidence: 99%

Geochronology and geochemistry of granites from the Hengjian area, Qinling Orogenic Belt: Implications for the Late Palaeozoic tectonic evolution of the North Qinling Terrane, China

Han

Lin

et al. 2021

Geological Journal

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The North Qinling Orogen underwent subduction and collision processes during the Palaeozoic, but the tectonic framework remains unclear. To investigate the tectonic evolution of the North Qinling Orogen, we selected the Devonian granites from the northeastern margin of the North Qinling Terrane. Integrated petrographic, geochemical, and geochronological studies, as well as Sr-Nd-Hf isotopic analyses, were carried out on the newly identified Devonian granites from the Hengjian area in the northeastern North Qinling Terrane, Qinling Orogenic Belt. Zircon laser ablation inductively coupled plasma mass spectrometry U-Pb dating reveals that these granites were crystallized at 396-387 Ma. The granite samples are metaluminous to weakly peraluminous (A/CNK = Al 2 O 3 /(CaO+Na 2 O+K 2 O) = 0.86 to 1.12), with high SiO 2 (60.6-76.5 wt%) and high total alkaline (Na 2 O + K 2 O = 8.45-11.0 wt%) contents. The granites are enriched in Th, rare-earth element, Zr, and Hf and depleted in Sr, Nb, Ta, P, Eu, and Ti. They are characterized by high Zr + Nb + Ce + Y contents (511-990 ppm) and 10,000*Ga/Al ratios (2.71-3.32), as well as high zircon-saturation temperatures (T Zr = 819-885 C, average = 845 C), which indicate that they are typical A-type granites. The granites have low Y/Nb (0.39-0.67) and Yb/Ta (0.56-0.83) ratios, resembling those of the A 1 -type granite, which indicates that they are formed in anorogenic settings. They also have low ( 87 Sr/ 86 Sr) i ratios (0.7055-0.7071) and negative ε Nd (t) values (À10.1 to À8.40) and variable zircon ε Hf (t) values (À8.46 to +14.7), with the two-stage model ages of 2.0-1.8 Ga and 1.9-0.4 Ga, respectively. These geological features suggest that the granites of the Hengjian area were most likely generated by partial melting of mafic lower crust induced by asthenospheric ascent. The A-type granites were generated in a continental rift environment during 396-387 Ma, corresponding to the closure of the Shangdan Ocean and the opening of the Palaeo-Tethyan Ocean during the Early Devonian.

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Section: Tectonic Implicationsmentioning

confidence: 99%

Geochronology and geochemistry of granites from the Hengjian area, Qinling Orogenic Belt: Implications for the Late Palaeozoic tectonic evolution of the North Qinling Terrane, China

Han

Lin

et al. 2021

Geological Journal

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“…Mesoproterozoic Grenvillian-age granitic rocks (Mabi et al, 2018;Wang et al, 2019;Zhu et al, 2020a), amphibolites (Lu et al, 2022) and ma c dykes and references therein) are rarely and sporadically distributed.…”

Section: Geological Backgroundmentioning

confidence: 99%

Newly Identified A-type Granite in Western Yangtze Block and Its Geochemistry Characteristics

Mabi

Zhang

et al. 2022

Preprint

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Numerous Neoproterozoic granitic intrusions occur over a north-south distance of more than 700 km in western Yangtze Block. In this paper, we newly identified Shimian granitic pluton as A-type granite which was previously considered as S-type granite in the region, with presenting its zircon U-Pb age, Lu-Hf isotopic and whole-rock geochemical data. The selected fresh samples for this study are mainly porphyritic biotite monzogranites. They are weak peraluminous, A2-subtype granites, displaying high contents of SiO2 and K2O, low Cao and Na2O with the characteristics of high silica, rich potassium, and low sodium. They are enriched in incompatible trace elements, but low in trace elements compatible in mafic silicates and feldspars, and chemically characterized by having high REE and Ga abundances and low Al, Ni, Ba, Sr, and Eu abundances. The major and trace element behavior suggests that the granites are formed by advanced fractional crystallization. Zircon U-Pb age shows the Shimian granitic pluton was emplaced at 728 ± 20 Ma. The studied granites yield an average 176Hf/177Hf value of 0.282363 (εHf = 0.8) with a 94% confidence interval of 0.282334 to 0.282384 (εHf = -0.1 to 1.7), indicating that they are derived from remelting of juvenile continental crust. We suggest that this newly identified A-type granite at Shimian, southwestern China was more plausibly generated in an extensional setting as a result of slab window caused by a ridge subduction, which can account not only for the formation of voluminous granitoids, but also for the basalts, boninitic pillow lavas, and SSZ-type ophiolites in western Yangtze Block.

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“…The Jiangnan Orogenic Belt has a reversed S-shape, and its suture zone stretches southwestward from the Hangzhou Gulf in the northeast via Jiangshan in southwestern Zhejiang Province, Pingxiang in western Jianxi Province, Hengyang in southern Hunan Province, Yulin in the southeastern Guangxi Zhuang Autonomous Region, and Qinzhou Gulf in the southwest. This orogenic belt, which is considered part of the Grenville orogenic belt that rounded the Yangtze Craton (Li et al 2010;Cawood et al 2018;Wang et al 2019), is dominated by early Neoproterozoic (ca. 1000-800 Ma) metavolcano-metasedimentary rocks that experienced greenschistfacies metamorphism (Zhou et al 2002;Yao et al 2014).…”

Section: G E O L O G I C a L S E T T I N G Smentioning

confidence: 99%

“…1000-800 Ma) metavolcano-metasedimentary rocks that experienced greenschistfacies metamorphism (Zhou et al 2002;Yao et al 2014). These metamorphic sequences were intruded by Late Neoproterozoic, Early Palaeozoic and Mesozoic granitoids (Sun 2006;Wang et al 2019).…”

Section: G E O L O G I C a L S E T T I N G Smentioning

confidence: 99%

Upper crustal structure beneath the Qin-Hang and Wuyishan metallogenic belts in Southeast China as revealed by a joint active and passive seismic experiment

Zheng

Lü

et al. 2022

Geophysical Journal International

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Summary Southeast China is one of the most important polymetallic metallogenic provinces in the world. However, distinct differences in the type and origin of the mineral deposits are present between the major metallogenic belts in this province. To deepen our knowledge of this regional metallogenic setting, investigate the factors controlling its metallogenic differences, and explore the feasibility of active and passive seismic imaging, we performed a multibatch seismic experiment using active and passive sources with the help of 437 short-period seismographs deployed across the Qin-Hang and Wuyishan metallogenic belts in Southeast China. We resolved the S-wave velocity structure beneath the profile using ambient noise tomography and derived a Vp/Vs model by combining with a published P-wave model. A good correlation between the obtained seismic velocity models and geological observations are observed. The Proterozoic volcanic-sedimentary rock series and the Fuzhou-Yongfeng sedimentary basin are identified by low P- and S-wave velocities, high Vp/Vs ratios, and low S-wave velocity perturbations. Within the core of the Wuyishan Metallogenic Belt, several narrow, elongated, and low seismic velocity anomalies are considered to be signs of the nearby fault zones, and these anomalies provide reference information on the extension and pattern of these faults at depth. Combined with the geological and mineralogical evidence, we propose that theses faults function as ore-guiding structures and facilitate the formation of regionally representative mineral species and metal assemblages.

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Ca. 1.04 Ga hot Grenville granites in the western Yangtze Block, southwest China

Cited by 39 publications

References 70 publications

Geochronology and geochemistry of granites from the Hengjian area, Qinling Orogenic Belt: Implications for the Late Palaeozoic tectonic evolution of the North Qinling Terrane, China

Geochronology and geochemistry of granites from the Hengjian area, Qinling Orogenic Belt: Implications for the Late Palaeozoic tectonic evolution of the North Qinling Terrane, China

Newly Identified A-type Granite in Western Yangtze Block and Its Geochemistry Characteristics

Upper crustal structure beneath the Qin-Hang and Wuyishan metallogenic belts in Southeast China as revealed by a joint active and passive seismic experiment

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Ca. 1.04 Ga hot Grenville granites in the western Yangtze Block, southwest China

Cited by 39 publications

References 70 publications

Geochronology and geochemistry of granites from the Hengjian area, Qinling Orogenic Belt: Implications for the Late Palaeozoic tectonic evolution of the North Qinling Terrane, China

Geochronology and geochemistry of granites from the Hengjian area, Qinling Orogenic Belt: Implications for the Late Palaeozoic tectonic evolution of the North Qinling Terrane, China

Newly Identified A-type Granite in Western Yangtze Block and Its Geochemistry Characteristics

Upper crustal structure beneath the Qin-Hang and Wuyishan metallogenic belts in Southeast China as revealed by a joint active and passive seismic experiment

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Ca. 1.04 Ga hot Grenville granites in the western Yangtze Block, southwest China