Late Paleozoic post-collisional magmatism in the Eastern Tianshan Belt, Northwest China: New insights from geochemistry, geochronology and petrology of bimodal volcanic rocks

Chen, Xijie; Shu, Liangshu; Santosh, M.

doi:10.1016/j.lithos.2011.06.008

Cited by 166 publications

(112 citation statements)

References 118 publications

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“…Two different main models have been proposed for the evolution of the B-H belt: 1) a Carboniferous island arc that was subsequently superimposed by a Permian post-collisional orogenic belt (Chen et al, 2011;Laurent-Charvet et al, 2003;Ma et al, 1997;Shu et al, 2011;W.-J. Xiao et al, 2004;Yuan et al, 2010); 2) a Carboniferous-Permian continental rift associated with a mantle plume (Gu et al, 2000(Gu et al, , 2001Xia et al, 2008Xia et al, , 2012.…”

Section: Implication For Regional Tectonic Evolutionmentioning

confidence: 99%

“…Their argument was built on a ca. 316 Ma "stitching pluton" which displays some characteristics of postcollisional A-type granites (Chen et al, 2011;Han et al, 2010;Zhang and Zou, 2013). However, this "stitching pluton" shows a wide SiO 2 range (58-74%) with a metaluminous I-type affinity (Si et al, 2014).…”

Section: Implication For Regional Tectonic Evolutionmentioning

confidence: 99%

“…Others believed that it closed during the Late Carboniferous (Gao et al, 1998;Shu et al, 2011;Windley et al, 1990). This derives from the idea of a Carboniferous island arc setting to Permian post-collisional orogenic setting (Chen et al, 2011;Laurent-Charvet et al, 2003;Ma et al, 1997;Shu et al, 2011;W.-J. Xiao et al, 2004;Yuan et al, 2010;Zhu et al, 2009).…”

mentioning

confidence: 99%

“…Xiao et al, 2004;Yuan et al, 2010;Zhu et al, 2009). Otherwise, some also argued that the Paleo-Tianshan Ocean closed at the end of Early Carboniferous given the occurrence of~316 Ma A-type "stitching pluton" (Chen et al, 2011;Han et al, 2010).…”

mentioning

confidence: 99%

“…Here, we also emphasize that high pressure rather than water content plays a dominate role to delay plagioclase nucleation in a tholeiite HAB. Wang et al (2011), andXiao et al (2013), ① Kalameili Fault, ② North Tianshan-Aqikuduke-Shaquanzi Fault, ③ South Tianshan Future, ④ Kumishi-Kawabulake-Xingxingxia Fault, ⑤ North Tarim Suture; B) Geological map of the Bogda oregenic belt at the north margin of the Chinese North Tianshan, modified after Chen et al (2011) andZhao et al (2014).…”

mentioning

confidence: 99%

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High-alumina basalts from the Bogda Mountains suggest an arc setting for Chinese Northern Tianshan during the Late Carboniferous

Xie

Chen

et al. 2016

Lithos

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Section: Implication For Regional Tectonic Evolutionmentioning

confidence: 99%

Section: Implication For Regional Tectonic Evolutionmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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High-alumina basalts from the Bogda Mountains suggest an arc setting for Chinese Northern Tianshan during the Late Carboniferous

Xie

Chen

et al. 2016

Lithos

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B isotopes of Carboniferous‐Permian volcanic rocks in the Tuha basin mirror a transition from subduction to intraplate setting in Central Asian Orogenic Belt

Liu

Wei

et al. 2016

JGR Solid Earth

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Controversies remain as to the Permian tectonic setting in the Central Asian Orogenic Belt (CAOB), in particular, regarding the triggering of Permian magmatism. To address this issue, we carried out a geochemical study on Dananhu volcanics from the Tuha basin, southwestern CAOB. 40Ar/39Ar analyses for feldspar separates yield a Carboniferous age of 321.2 ± 9.8 Ma for the andesites and a Permian age of 278.9 ± 4.2 Ma for the basalts. Both the andesites and basalts geochemically resemble subduction‐related magmas in aspects of their trace element and Sr‐Nd‐Pb isotopic composition, but they may differ in petrogenesis. The andesites are typical adakites. Their high Cr and Ni contents, and low heavy rare earth element contents, and positive correlation between B/Nb ratios and δ11B values suggest that they were generated by interaction between slab‐derived melts/fluids and the mantle wedge. The Permian basalts are subdivided into two subgroups: alkali and tholeiitic basalts. High Ba/La and Ba/Zr ratios indicate that the source of the alkali basalts has been metasomatized by fluids/melts derived from altered oceanic crust. In contrast, a volatile‐free source metasomatized by sediment‐derived fluids/melts is inferred for the tholeiitic basalts given their high Th/Zr and Th/Ce ratios. Negative correlation between B/Nb and δ11B for the Permian basalts imply that the arc signatures were imposed by previous subduction events, and no direct slab‐derived fluids/melts participated in their petrogenesis. These geochemical characteristics alongside regional geologic records collectively suggest a tectonic shift in the southwestern CAOB from subduction‐related setting during the Late Carboniferous to an intraplate setting during the Early Permian.

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Geochemical characteristics and tectonic setting of the bimodal volcanic rocks in Sepikou region of eastern Tianshan

et al. 2017

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The Sepikou region is located in the eastern Bogda Mountains of the east Tianshan. The Bogda belt is mainly composed of Carboniferous strata, including the Lower Carboniferous Qijiaojing Formation (C1q), Upper Carboniferous Liushugou Formation (C2l), and Qijiagou Formation (C2qj). Here, we report the petrology, geochemistry, and geochronology of bimodal volcanic rocks from the Upper Carboniferous Liushugou Formation, which is widely distributed in the Sepikou region. The basalts, basaltic andesite, and keratophyre have similar petrochemical characteristics and exhibit the high‐Na, low‐K characteristics belonging to calc‐alkalic rocks. These are characterized by the high abundance of K, Rb, Th, Ba, the depletion of HFSE (Nb, Ta, Zr, and Hf), and the slight depletion of Ti. Chondrite‐normalized rare‐earth elements (REE) patterns for basalts‐keratophyre show right‐leaning parallel curve clusters, together with a slight enrichment in light rare‐earth elements (LREE) contents and low heavy rare‐earth elements (HREE)/LREE ratios. The keratophyre exhibits slightly negative Eu anomalies. Compared with the basalts, the rhyolites have high alkali contents, slightly high ∑REE contents, low heavy rare‐earth elements/LREE ratios, negative εSr(t) (−9.1 to −12.0), low 87Sr/86Sr initial ratio, highly positive εNd (t) (+5.3 to +6.4), and low Pb isotope ratios. The fractionated REE patterns with prominent negative Eu anomalies suggest they were chiefly derived from the mantle magma underplated basaltic body remelting from the depleted mantle source. The LA‐ICP‐MS analysis on zircons from quartz keratophyre and rhyolite yield similar ages of 314.9 ± 1.2 and 314.0 ± 1.1 Ma, respectively, suggest that the major bimodal volcanism took place in the Late Carboniferous epoch. The quartz keratophyre zircons, with the 176Hf/177Hf ratios of 0.282897–0.283097, have highly positive εHf (10.99–19.97) and depleted mantle model ages between 180 and 628 Ma. The mafic rocks were chiefly derived from the depleted mantle with the partial incorporation of crustal components. The bimodal volcanic rocks were formed under a continental rift setting. The rift experienced extension in the early period of the Early Carboniferous and its final closure arose after a late period of the Late Carboniferous.

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Late Paleozoic post-collisional magmatism in the Eastern Tianshan Belt, Northwest China: New insights from geochemistry, geochronology and petrology of bimodal volcanic rocks

Cited by 166 publications

References 118 publications

High-alumina basalts from the Bogda Mountains suggest an arc setting for Chinese Northern Tianshan during the Late Carboniferous

High-alumina basalts from the Bogda Mountains suggest an arc setting for Chinese Northern Tianshan during the Late Carboniferous

B isotopes of Carboniferous‐Permian volcanic rocks in the Tuha basin mirror a transition from subduction to intraplate setting in Central Asian Orogenic Belt

Geochemical characteristics and tectonic setting of the bimodal volcanic rocks in Sepikou region of eastern Tianshan

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