Ages, trace elements and Hf-isotopic compositions of zircons from claystones around the Permian-Triassic boundary in the Zunyi Section, South China: Implications for nature and tectonic setting of the volcanism

Gao, Qiuling; Chen, Zhong‐Qiang; Zhang, Ning; Griffin, William L.; Wenchen, Xia; Wang, Guoqing; Jiang, Tengfei; Xia, Xuefei

doi:10.1007/s12583-015-0589-9

Cited by 27 publications

(11 citation statements)

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“…For the Emeishan Large Igneous Province in southwestern South China, the major basaltic eruption is thought to have occurred at c. 260 Ma (He et al 2003) and the associated intermediate to felsic plutons were dated at c. 260-251 Ma (Xu et al 2008;Shellnutt et al 2009;Zhong et al 2009Zhong et al , 2011He, 2016), regardless of the compositional discrepancy, also suggesting a timing overlap with those coeval volcanic ash beds in South China except for those later during Early Triassic time. A second view argues that they may have been sourced from intermediate to felsic volcanism that is related to the closure of the Palaeotethys Ocean or the formation of the Pangea supercontinent (Clark et al 1986;He et al 1989He et al , 2014Yin et al 1989Yin et al , 1992Yin et al , 2007Yang et al 1991Yang et al , 2012Isozaki et al 2007;Gao et al 2013Gao et al , 2015. Our data argue for a convergent continental margin source for the PTB ash beds in South China; however, the precise location of the source volcanism is subject to debate.…”

Section: B Location Of the Volcanic Sourcementioning

confidence: 73%

“…white, yellow, light grey or greyish-green) and high content of clay minerals make them distinguishable from their surrounding rocks in the outcrop (Yang et al 1991;Yin et al 1992;Hong et al 2008). Weighted mean ages of zircons from these ash beds range from 254.31 ± 0.07 Ma to 246.8 ± 1.3 Ma (Shen et al 2011a;Zhu et al 2011;Yang et al 2012;Gao et al 2013Gao et al , 2015Burgess et al 2014;He et al 2014;Liao et al 2016a;Baresel et al 2017). Yin et al (1989), Yang et al (1991Yang et al ( , 2012, Shen et al (2011a), Zhu et al (2011), Gao et al (2013Gao et al ( , 2015, Burgess et al (2014), He et al (2014), Liao et al (2016a, b), Baresel et al (2017) and the SHP section in this study.…”

Section: Geological Backgroundmentioning

confidence: 99%

“…The red circle represents zircons from felsic rocks at convergent continental margins before post-collisional extension. The shaded area represents data compiled from other PTB volcanic ash beds in South China (after Yang et al 2012;Gao et al 2013Gao et al , 2015.…”

Section: B Location Of the Volcanic Sourcementioning

confidence: 99%

“…Our data argue for a convergent continental margin source for the PTB ash beds in South China; however, the precise location of the source volcanism is subject to debate. Existing studies argue for the convergent continental margin of the southwestern South China Craton (Yang et al 2012;Gao et al 2013Gao et al , 2015 or the convergent continental margin in the East Kunlun area (He et al 2014). However, except for the intermediate to felsic nature and their tectonic affinity to magmatic arc, the link between these possible parent volcanisms and PTB volcanic ash beds in South China was mainly developed based on obtained ages and the spatial variation in the thickness and numbers of the PTB ash beds.…”

Section: B Location Of the Volcanic Sourcementioning

confidence: 99%

“…Coeval tuffs found on the uppermost of the Emeishan basalt succession have led to the conclusion that these tuffs were sourced from the Emeishan Large Igneous Province (Zhu et al 2011). However, recent studies (Yang et al 2012;Gao et al 2013Gao et al , 2015He et al 2014) based on U-Pb ages, trace elements and Hf isotopes of zircons suggest that these volcanic ash beds may be sourced from convergent continental margins in the eastern Tethyan region, but precise locations are subject to debate. Existing studies argue for the convergent continental margin of the southwestern South China Craton (Yang et al 2012;Gao et al 2013Gao et al , 2015 or the convergent continental margin in the East Kunlun area (He et al 2014).…”

Section: Introductionmentioning

confidence: 99%

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Nature and origin of the volcanic ash beds near the Permian–Triassic boundary in South China: new data and their geological implications

et al. 2019

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Permian–Triassic boundary (PTB) volcanic ash beds are widely distributed in South China and were proposed to have a connection with the PTB mass extinction and the assemblage of Pangea. However, their source and tectonic affinity have been highly debated. We present zircon U–Pb ages, trace-element and Hf isotopic data on three new-found PTB volcanic ash beds in the western Hubei area, South China. Laser ablation inductively coupled plasma mass spectrometry U–Pb dating of zircons yields ages of 252.2 ± 3.6 Ma, 251.6 ± 4.9 Ma and 250.4 ± 2.4 Ma for these three volcanic ash beds. Zircons of age c. 240–270 Ma zircons have negative εHf(t) values (–18.17 to –3.91) and Mesoproterozoic–Palaeoproterozoic two-stage Hf model ages (THf2) (1.33–2.23 Ga). Integrated with other PTB ash beds in South China, zircon trace-element signatures and Hf isotopes indicate that they were likely sourced from intermediate to felsic volcanic centres along the Simao–Indochina convergent continental margin. The Qinling convergent continental margin might be another possible source but needs further investigation. Our data support the model that strong convergent margin volcanism took place around South China during late Permian – Early Triassic time, especially in the Simao–Indochina active continental margin and possibly the Qinling active continental margin. These volcanisms overlap temporally with the PTB biocrisis triggered by the Siberian Large Igneous Province. In addition, our data argue that the South China Craton and the Simao–Indochina block had not been amalgamated with the main body of Pangea by late Permian – Early Triassic time.

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Section: B Location Of the Volcanic Sourcementioning

confidence: 73%

Section: Geological Backgroundmentioning

confidence: 99%

Section: B Location Of the Volcanic Sourcementioning

confidence: 99%

Section: B Location Of the Volcanic Sourcementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Nature and origin of the volcanic ash beds near the Permian–Triassic boundary in South China: new data and their geological implications

et al. 2019

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Provenance of the Permian–Triassic boundary volcanic ash beds in South China

Zhao

Wang

et al. 2021

Geological Journal

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Volcanism represented by the Permian-Triassic boundary (PTB) volcanic ash beds in South China plays a vital role in the PTB mass extinction. However, the probable provenance of the PTB volcanic ashes has not been exactly identified until now. In this study, the geochemical analysis was conducted on newly found five volcanic ash beds from the Mao'ershan and Tielukou sections in the northern part of the Yangtze platform. Volcanic ashes geochemistry indicates a felsic nature and negative Eu anomalies. Zircons selected from the five ash beds yield LA-ICP-MS U-Pb ages varying from ca. 255 to 248 Ma, and ε Hf (t) values of −8.6 to 1.1, which indicates the earlier stage volcanic ash beds in Mao'ershan are likely derived from mantle material and partial melting of crustal rocks, and the later stage volcanic ash beds in Tielukou are derived largely from ancient crustal rocks. Combined with previous U-Pb ages, ε Hf (t) values, trace elements of zircons, and geological setting, the PTB volcanic ash beds probably drift from the Jomda-Weixi volcanic belt in Sanjiang region of SE Asia, and that are represented by the volcanic rocks in Misha regions, eastern margin of the Lanping Basin. New data and discussion on the provenance of the PTB volcanic ashes provide important implications for the trigger of PTB mass extinction.

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Age, genesis, and geological significance of Permian–Triassic boundary volcanic tuffs in the northeastern margin of South China

Xie

et al. 2023

Geological Journal

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The Permian-Triassic boundary (PTB) volcanic tuffs are widely distributed in the East Palaeo-Tethys region, but their age and origin have been controversial. The Permian-Triassic deep-water sediments in the northeastern margin of South China are favourable research objects, and we report new results from the PTB deep basin sediments in the Susong area, Anhui Province, in this paper. Two volcanic tuffs are found in the Zuoshan PTB in the Zuoshan section, and Laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) U-Pb zircon dating indicates that the upper and lower tuffs are 251.3 ± 1.7 Ma and 252.3 ± 2.1 Ma, respectively. The PTB age is 251.6 Ma according to a numerical interpolation method of the average deposition rate of the PTB. Fusulinids and non-fusulinid foraminifers in the limestone overlying the lower tuff define the rock as end-Permian. Zircon trace elements show that both tuffs are sourced from felsic volcanism in continental arc background, and their source magmas were derived from the continental crust. Zircons of PTB age from the upper tuff on the bottom of the Triassic have negative ε Hf (t) value from À8.02 to À3.75, and the Palaeo-Mesoproterozoic two-stage model ages of 1502-1780 Ma, showing that their source rocks were only derived from the remelting of the Palaeo-Mesoproterozoic continental crust. The zircons from the lower tuff on the top of the Permian show two types, including negative ε Hf (t) values from À6.48 to À1.25 and Palaeo-Mesoproterozoic two-stage model ages of 1350-1679 Ma, and positive ε Hf (t) values from +3.98 to +10.15, and Neoproterozoic two-stage model ages of 629-1023 Ma, indicating that their sources were derived from the reworking of the Palaeo-Mesoproterozoic continental crust and early Neoproterozoic depleted mantle joined in juvenile crust growth in the northern margin of the South China Block at the beginning of the collision between the South China and North China blocks. The initial collision started no later than 252.3 Ma and developed significantly from east to west.

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Ages, trace elements and Hf-isotopic compositions of zircons from claystones around the Permian-Triassic boundary in the Zunyi Section, South China: Implications for nature and tectonic setting of the volcanism

Cited by 27 publications

References 50 publications

Nature and origin of the volcanic ash beds near the Permian–Triassic boundary in South China: new data and their geological implications

Nature and origin of the volcanic ash beds near the Permian–Triassic boundary in South China: new data and their geological implications

Provenance of the Permian–Triassic boundary volcanic ash beds in South China

Age, genesis, and geological significance of Permian–Triassic boundary volcanic tuffs in the northeastern margin of South China

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