A rhythmic source change of the Neoproterozoic basement meta-sedimentary sequences in the Jiangnan Orogen: Implications for tectonic evolution on the southeastern margin of the Yangtze Block

Li, Junyong; Wang, Xiao Lei; Zhang, Fengfeng; Zhou, Xingyu; Shu, Xu-Jie

doi:10.1016/j.precamres.2016.04.012

Cited by 47 publications

(19 citation statements)

References 85 publications

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“…The Jiangnan orogenic belt consists of variably deformed and metamorphosed mafic to silicic volcanic rocks and their intrusive equivalents, and siliciclastic sedimentary rocks, along with a lesser amount of high-pressure blueschists and ophiolitic melange-related mafic–ultramafic assemblages, siliceous limestone and chert (Shu et al 1994; Gao et al 2009; Li et al 2009; Shu, 2012; Li, J. Y. et al . 2016; Yao et al 2016 a ). These rocks are ascribed to a variety of lithostratigraphic units (e.g.…”

Section: Geologic Settingmentioning

confidence: 99%

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Differentiating continental and oceanic arc systems and retro-arc basins in the Jiangnan orogenic belt, South China

2019

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The Neoproterozoic Jiangnan orogenic belt records the accretion and collision between the Yangtze and Cathaysia blocks in South China. The orogen is divisible into three units: a northeastern domain (also referred to as the Huaiyu or Shuangxiwu domain), a central domain (Jiuling domain) and an undifferentiated southwestern domain. Detrital zircons from the oldest sequences (Shuangqiaoshan, Lengjiaxi, Fanjingshan and Sibao groups) in the central and southwest domains yield similar age spectra with major age populations at c. 875–820 Ma, along with minor Palaeo- to Mesoproterozoic and Archaean ages. The dominance of detrital ages close to the deposition ages of the units, along with juvenile zircon Hf isotopic compositions and arc-like whole-rock compositional data, indicate the sedimentary units accumulated adjacent to a convergent plate margin magmatic arc. The presence of Mesoproterozoic and older zircons, both as detritus in the units and as xenocrysts within igneous rocks displaying a subduction-related signature, along with the compositional data, place the magmatic arc along a continental margin. In the northeastern domain, the oldest coeval sequence (Shuangxiwu and Qigong groups) and arc igneous suites are dated at c. 970–850 Ma, and lack older detritus and xenocrysts, indicating they represent an accreted oceanic arc system.

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Section: Geologic Settingmentioning

confidence: 99%

“…Z. et al . 2012; Cawood et al 2013; Wang, X. L. et al 2014; Wang, J. Q. et al 2016; Yao et al 2015, 2016 a ; Li, J. Y. et al 2016; Li, L. M. et al . 2016).…”

Section: Geologic Settingmentioning

confidence: 99%

Differentiating continental and oceanic arc systems and retro-arc basins in the Jiangnan orogenic belt, South China

2019

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“…The metasediments are composed of two sets of sequences which were metamorphosed to low-greenschist facies, then separated by a prominent angular unconformity (Wang XL et al, 2012). The underlying sequences have been called 'basement sequences' (Wang et al, 2007), which are tightly folded (Wang et al, 2007;Li et al, 2016), while the overlying cover sequences show open folds with depositional rifting-facies features . As such, the unconformity between the two sets of sequences has been considered to be a marker of the Neoproterozoic orogenic event of assembly between the Yangtze and Cathaysia blocks, lasting until 860-800 Ma (Wang et al, 2007).…”

Section: Geological Backgroundmentioning

confidence: 99%

Sedimentary Facies, Provenance and Geochronology of the Heshangzhen Group: Implications for the Tectonic Evolution of the Eastern Jiangnan Orogen, South China

Zhou

Ren

et al. 2020

Acta Geologica Sinica (Eng)

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The Neoproterozoic Jiangnan orogen plays an important role in the study of the Precambrian tectonic evolution of South China. The tectonic nature of the Neoproterozoic sedimentary basins is still controversial, due to poor understanding of the sedimentary sequences and the lack of geochronological data. Here, we present sedimentological, provenance and geochronological data from the Heshangzhen Group in the eastern Jiangnan orogen. Sedimentological analysis shows that the Luojiamen Formation was deposited in a submarine fan, and the overlying Hongchicun Formation was deposited in front of a fan delta. The youngest detrital zircons constrain the lower Luojiamen and Hongchicun formations with ages of 827.3 ± 8.4 Ma and 825 ± 12 Ma, respectively. The sandstones of the Luojiamen Formation are characterized by a large number of intermediate to felsic volcanic grains, suggesting a volcanic arc source. In contrast, quartz and sedimentary lithic grains increase in the Hongchicun Formation, showing a new input from a collisional orogenic source. Detrital zircon from six sandstone samples in the Luojiamen and Hongchicun formations yield similar age spectra of 930–820 Ma with a peak at ca. 845–860 Ma, with one main cluster at 930–820 Ma. Detrital zircons of 930–845 Ma show a positive value of ∊Hf (t) (+2.4 to +11, mean +7.6), which is similar to the volcanic arc of the nearby Shuangxiwu Group. There are a minor group of zircons with U‐Pb ages ranging from 820 Ma to 845 Ma from the middle part of the Luojiamen Formation and Hongchicun Formation, with ∊Hf (t) values between –20 to +2.4, which are consistent with the characteristics of the Shuangqiaoshan Group. within light of the bidirectional paleocurrents in the Luojiamen Formation, it is speculated that the zircons of 820–845 Ma were recycled from the Shuangqiaoshan Group, which is derived from a continental arc to the northwest. Our data suggests that the Luojiamen Formation was formed in an inter‐arc basin, while the Hongchicun Formation was formed in an accretionary wedge‐top basin. When juxtaposed with the conglomeratic characteristics at the bottom of the Luojiamen Formation, it is believed that the unconformity represented by the ‘Shen Gong Movement’ reflects the rapid erosion and accumulation process of island arc volcanic material. The disconformity between the Luojiamen and Hongchicun formations is the imprint of transition from inter‐arc basin to accretionary wedge‐top basin, which represents the collision between the Shuangxiwu arc and the Yangtze Plate.

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“…Recently, many scholars have studied the Mesoproterozoic-Neoproterozoic magmatic rocks and sedimentary basins of the Yangtze Block and have had lively discussions about the reconstruction and recovery of the assembly and breakup process of the Rodinia supercontinent (Li et al, 2008a;Wang et al, 2013;Wang et al, 2014b;Cui et al, 2015;Wang et al, 2015;Zhao, 2015). Among all the discussions, the petrogenesis and tectonic setting of the magmatic rocks between 860 and 750 Ma are vigorously debated (Li, 1999a, Li et al, 2003bLi et al, 1999bLi et al, , 2008bWang and Li, 2003;Zhao et al, 2008;Deng et al, 2013;Zhang et al, 2013a, 2013b, 2014bLi et al, 2016). One view holds that the magmatic rocks between 860 and 750 Ma are the products of a continental rift system caused by mantle superplume activity (Li, 1999a, Li et al, 2003bWang and Li, 2003;Li et al, 1999bLi et al, , 2008bDeng et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

“…However, another view asserts that the magmatic rocks are independent of mantle superplume activity. Most magmatic rocks are the products of subduction-related orogeny and postorogenic extension/rifting (Zhao et al, 2008;Zhang et al, 2013aZhang et al, , 2013bWang et al, 2012Wang et al, , 2014aLi et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Early Neoproterozoic syncollisional S-type granites from the western Yangtze Block, South China: Implications for final closure of the back-arc basin

Li¹,

Wang²,

Cui³

et al. 2019

Episodes

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Records of Neoproterozoic magmatic activity in the western margin of the Yangtze Block are widely distributed, although considerable debate remains regarding the petrogenesis and tectonic setting of this region. We performed zircon U-Pb geochronologic, zircon Hf isotope and whole-rock geochemical analyses on Jinkouhe granite (JKHG) samples from the western margin of the Yangtze Block. The zircon U-Pb dating results show that the age of the JKHG formation is 860±4 Ma (MSWD=0.23). The JKHG is classified as high-K calc-alkaline strongly peraluminous S-type granite, and the samples have positive zircon ε Hf (t) values of 3.95 to 5.77. Based on the zircon ε Hf (t) values and the geochemical characteristics, we conclude that the JKHG is sourced from the mixture of partial melts of metagraywackes and partial melts of juvenile crust. The geochemical analysis shows that the JKHG has the characteristics of syncollisional granitic magmatism. Integrating previous studies with the regional correlations among magma records in this contribution, we propose that the Shimian-Ebian region was a back-arc basin system along the western margin of the Yangtze Block ca. 1070~940 Ma and that the JKHG may be related to the final closure of the back-arc basin.

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A rhythmic source change of the Neoproterozoic basement meta-sedimentary sequences in the Jiangnan Orogen: Implications for tectonic evolution on the southeastern margin of the Yangtze Block

Cited by 47 publications

References 85 publications

Differentiating continental and oceanic arc systems and retro-arc basins in the Jiangnan orogenic belt, South China

Differentiating continental and oceanic arc systems and retro-arc basins in the Jiangnan orogenic belt, South China

Sedimentary Facies, Provenance and Geochronology of the Heshangzhen Group: Implications for the Tectonic Evolution of the Eastern Jiangnan Orogen, South China

Early Neoproterozoic syncollisional S-type granites from the western Yangtze Block, South China: Implications for final closure of the back-arc basin

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