Ordovician appinites in the Wugongshan Domain of the Cathaysia Block, South China: Geochronological and geochemical evidence for intrusion into a local extensional zone within an intracontinental regime

Zhong, Yufang; Ma, Changqian; Liu, Lei; Zhao, Jun‐Hong; Zheng, Jianping; Jun-nian, Nong; Zhang, Zejun

doi:10.1016/j.lithos.2014.04.002

Cited by 30 publications

(10 citation statements)

References 69 publications

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“…11), reflecting the input of mantle-derived melt. The reported early Paleozoic mafic rocks at present include the nearby appinites in Wugongshan area on the east of Piangxiang (Zhong et al, 2014) and gabbros and basalts in Guangdong and Fujian provinces (Wang et al, 2013b;Yao et al, 2012;Zhang et al, 2015) (Fig. 1b).…”

Section: Origin Of the Mmes: Insufficient Digestion Of Mantle-derivedmentioning

confidence: 94%

“…10), which contradicts with an origin of partial melting of recently modified lower crust similar to the Banshangpu and Hongxiaqiao plutons which is enriched in such incompatible elements. Additionally, (Zhong et al, 2014), gneissic granites from the Wugongshan, North Wuyi and South Wuyi areas (Wang et al, 2011), I-type granites and coexisting mafic enclave from the Banshanpu and Hongxiaqiao plutons (Guan et al, 2014), other I-type granites of the eastern Yangtze Block and the Taishan pluton (Huang et al, 2013), Xinyi gabbros, and mafic rocks in the inner Cathaysia Block (Wang et al, 2013b;Yao et al, 2012;Zhang et al, 2015). the Zhangjiafang granodiorite and MME samples have more negative ε Nd (t) and ε Hf (t) values than the Banshanpu and Hongxiaqiao plutons in the eastern Yangtze Block, but are similar to the Taishan I-type granitoid rocks in the Cathaysia Block (Figs.…”

Section: The Block Boundary Between the Eastern Yangtze And Cathaysiamentioning

confidence: 99%

“…The diagrams of SiO 2 versus trace elements of Sr, Ba, Th, U, Cr and Co for Zhangjiafang (ZJF) granodiorites and MMEs. The data sources: appinites from the Wugongshan (WGS) area (Zhong et al, 2014), gneissic granites from the Wugongshan (WGS), North Wuyi and South Wuyi areas in the Cathaysia Block (Wang et al, 2011), Daning granite in northeastern Guangxi (Cheng et al, 2009), I-type granites and coexisting mafic enclave from the Banshanpu (BSP) and Hongxiaqiao (HXQ) plutons (Guan et al, 2014).…”

Section: Origin Of the Mmes: Insufficient Digestion Of Mantle-derivedmentioning

confidence: 99%

“…8), indicating that they were derived from partial melting of predominant metasomatism mantle source. The Wugongshan appinites, originating from an ancient metasomatised mantle but undergoing crustal assimilation and fractional crystallization (AFC) process (Zhong et al, 2014), have relatively lower ε Nd (t) values than the gabbros and basalts in Guangdong and Fujian provinces (Fig. 11).…”

Section: Origin Of the Mmes: Insufficient Digestion Of Mantle-derivedmentioning

confidence: 99%

“…Insert geochronology histogram show the age range of the early Paleozoic mafic and granitic rocks in the eastern SCB. Geochronology data are according to the literatures Gan et al, 1993;Guan et al, 2014;Huang et al, 2013;Li et al, 2010;Lou et al, 2005;Peng et al, 2006;Shen et al, 2008;Wan et al, 2007;Wang et al, 2007Wang et al, , 20112013b;Wu and Zhang, 2003;Xia et al, 2014;Xie and Yang, 2000;Xu and Xu, 2015;Xu et al, 2009;Zhang et al, 2012Zhang et al, , 2015Zhong et al, 2014Zhong et al, ). et al, 2012.…”

Section: Introductionmentioning

confidence: 99%

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I-type granitoids associated with the early Paleozoic intracontinental orogenic collapse along pre-existing block boundary in South China

Yang

Huang

et al. 2016

Lithos

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The early Paleozoic Wuyi-Yunkai orogeny resulted in extensive magmatism in the Cathaysia and eastern Yangtze blocks, South China. Identifying the nature of related magmatism is essential for understanding the orogeny that remains enigmatic with regard to its tectonic setting and geodynamic driving force. The Zhangjiafang pluton (438 ± 3 Ma) in western Jiangxi province is composed of predominant granodiorite with abundant coeval mafic-intermediate microgranular enclaves (MMEs) (~433 ± 5 Ma). The granodiorite samples are weakly peraluminous (A/CNK = 1.05-1.09) and have low SiO 2 (61.9-64.9 wt.%) and high Fe 2 O 3 (4.6-5.6 wt.%), MgO (2.2-2.8 wt.%) and CaO (4.3-4.8 wt.%), belonging to I-type suite due to abundant amphibole in the rocks. They exhibit strongly negative whole-rock ε Nd (t) values (−11 to −9) and zircon ε Hf (t) values (−14 to −4), similar to the basement of the Cathaysia Block, but distinguishable from simultaneous I-type granites of the Banshanpu and Hongxiaqiao plutons in eastern Yangtze Block in much lower Sr, Ba, Th and U. The MME samples show pronounced negative Nb-Ta-Ti anomalies and have overall less negative whole-rock ε Nd (t) (−9 to −7) and zircon ε Hf (t) values (−9 to −4) than the host granodiorite, which are best interpreted as products of mantle-derived melts that mixed insufficiently with crust-derived magma. The block boundary between the eastern Yangtze and Cathaysia blocks should pass through the nearby west area (i.e., Pingxiang City) of the Zhangjiafang pluton. The Early Paleozoic I-type granitic rocks near the block boundary have all negative ε Nd (t) and ε Hf (t) values, demonstrating an overall ancient basement of the two blocks prior to the Wuyi-Yunkai orogeny, preferring an intracontinental orogeny model. However, the early Paleozoic mafic rocks and I-type granites with coeval MMEs were frequently present along the Jiangshan-Shaoxing-Pingxiang Fault zone, illustrating widespread modification of the ancient basement adjacent to the block boundary by mantle-derived melt during the orogenic collapse. The pre-existing block boundary might have promoted asthenosphere upwelling and basaltic underplating during the intracontinental orogenic collapse.

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Section: Origin Of the Mmes: Insufficient Digestion Of Mantle-derivedmentioning

confidence: 94%

Section: The Block Boundary Between the Eastern Yangtze And Cathaysiamentioning

confidence: 99%

Section: Origin Of the Mmes: Insufficient Digestion Of Mantle-derivedmentioning

confidence: 99%

Section: Origin Of the Mmes: Insufficient Digestion Of Mantle-derivedmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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I-type granitoids associated with the early Paleozoic intracontinental orogenic collapse along pre-existing block boundary in South China

Yang

Huang

et al. 2016

Lithos

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Geochronology and geochemistry of Early Silurian felsic volcanic rocks in the Dabaoshan ore district, South China: Implications for the petrogenesis and geodynamic setting

Qin

et al. 2018

Geological Journal

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The Early Paleozoic orogeny in South China has remained controversial in the long run with debate over intracontinental orogeny versus plate subduction. Limited studies have focused on the Early Paleozoic volcanic rocks in South China, which is crucial for us to understand the tectonic evolution of the South China Block. The Dabaoshan Fe–Cu–Pb–Zn–Mo–W orefield, one of the largest polymetallic deposits in South China, is hosted by Paleozoic volcanic‐sedimentary rocks and Mesozoic granitic porphyry. In this study, zircon U–Pb dating yielded ages of 439.4 ± 2.7 Ma, 439.3 ± 3.2 Ma, and 442.0 ± 2.2 Ma for the Dabaoshan dacite. These ages are all in good agreement within errors and indicate that the dacite formed during the early Silurian (ca. 440 Ma). The dacites are slightly peraluminous, calc‐alkaline with relatively high K2O + Na2O, FeOt, TiO2, CaO/Na2O ratios, and small negative Eu anomalies. They show enrichment in LILEs and LREE and depletion in Ba, Nb, Sr, P, and Ti. It has high initial 87Sr/86Sr values (0.70983–0.71140) and negative εNd(t) values ranging from −7.6 to −10 with T2DM ages of 1.80–1.99 Ga, εHf(t) values from −4.95 to −15.48 with T2DM ages of 1.72 Ga to 2.38 Ga. The overlapped Nd–Hf two‐stage model ages range from 1.89 Ga to 1.99 Ga, which indicates that the Dabaoshan dacite originated from a Paleoproterozoic source. Combining these geochemical and in situ zircon Hf isotopic data, we propose that the Dabaoshan dacite may have originated from the partial melting of mixed source of Paleoproterozoic metasedimentary and metaigneous rocks as a result of underplating of mafic magma during the post‐orogenic collapse and extension followed by lithospheric thining and asthenospheric mantle upwelling in an intraplate setting. Based on field observation and the geochronology results, we propose that the stratiform Cu–Pb–Zn mineralization may be related with the early Silurian volcanic rocks.

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Petrogenesis and tectonic significance of Sardasht syenite–monzonite–gabbro–appinite intrusions, NW Iran

Fazlnia

2018

Int J Earth Sci (Geol Rundsch)

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Ordovician appinites in the Wugongshan Domain of the Cathaysia Block, South China: Geochronological and geochemical evidence for intrusion into a local extensional zone within an intracontinental regime

Cited by 30 publications

References 69 publications

I-type granitoids associated with the early Paleozoic intracontinental orogenic collapse along pre-existing block boundary in South China

I-type granitoids associated with the early Paleozoic intracontinental orogenic collapse along pre-existing block boundary in South China

Geochronology and geochemistry of Early Silurian felsic volcanic rocks in the Dabaoshan ore district, South China: Implications for the petrogenesis and geodynamic setting

Petrogenesis and tectonic significance of Sardasht syenite–monzonite–gabbro–appinite intrusions, NW Iran

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