Zircon U–Pb geochronology and geochemistry of the Lajimiao mafic complex in the Shangdan Suture Zone, Qinling orogen: Petrogenesis and tectonic implications

Chang, Huan; Wu, Yuan–Bao; Zhou, Guangyan; Zhang, Wenxiang; He, Yu; Zhao, Yujie; Hu, Pan; Hu, Zhaochu

doi:10.1016/j.lithos.2021.106113

Cited by 9 publications

(5 citation statements)

References 67 publications

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“…Besides, some subducted-related intrusive rocks yielded zircon U-Pb age at 534-420 Ma, which indicates subduction of the Shangdan Ocean during the Early Palaeozoic (Chang et al, 2021;Dong et al, 2013;Jiang et al, 2022;Wang, Wang, & Zhang, 2015).…”

Section: Geological Settingmentioning

confidence: 96%

“…These mafic rocks of ophiolites (534–470 Ma) were divided into N‐ and E‐MORB, representing a remnant of the Shangdan oceanic crust (Dong, Zhang, Neubauer, et al, 2011; Li, Yang, et al, 2015; Yang et al, 2006). Besides, some subducted‐related intrusive rocks yielded zircon U–Pb age at 534–420 Ma, which indicates subduction of the Shangdan Ocean during the Early Palaeozoic (Chang et al, 2021; Dong et al, 2013; Jiang et al, 2022; Wang, Wang, et al, 2009; Wang, Wang, & Zhang, 2015).…”

Section: Geological Settingmentioning

confidence: 99%

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Late Palaeozoic tectonic transformation of the North Qinling Orogenic Belt: Insight from the geochronology, geochemistry and Sr‐Nd‐Hf isotopes of Carboniferous magmatic rocks

Liang,

Li,

Dong

et al. 2024

Geological Journal

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The North Qinling Orogenic Belt (NQB) records the pivotal geological information for understanding the Palaeozoic evolution of the Qinling Orogenic Belt (QOB). Previous studies mainly focused on the subduction–collision process along the Shangdan suture zone before the Early Devonian. However, as the significant interim period between the Early Palaeozoic and Mesozoic orogeny, the Late Palaeozoic tectonic evolution of the NQB remains poorly understood. Fortunately, the Carboniferous magmatic rocks discovered this time provide substantial geological evidence for revealing the Late Palaeozoic tectonic history of the Qinling Orogenic Belt. This paper will provide a detailed analysis of zircon U–Pb ages, geochemical characteristics and Sr‐Nd‐Hf isotopic compositions of Carboniferous rocks. The Carboniferous magmatic rocks are categorized as highly differentiated S‐type granite and monzodiorite, formed at 350 ± 2.4 Ma and 353 ± 5.2 Ma, respectively. The granite shows weak peraluminous (A/CNK = 1.02–1.11) and shoshonite nature. Based on the isotopic composition and trace element characteristics, we propose that the Qinling Group paragneiss is the primary source of the Carboniferous granite. Monzodiorite is characterized by enriched LREEs and LILEs (Ba, K and Pb), depleted HFSEs (Th, Nb, Ta and Ti) and enriched Sr‐Nd isotopic composition. Monzodiorite magma source region consists of continental crustal material and lithospheric metasomatized mantle. Carboniferous magmatic rocks are the product of an extensional tectonic setting, which indicates the NQB tectonic regimes transition from compression to extension during the Carboniferous.

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Section: Geological Settingmentioning

confidence: 96%

Section: Geological Settingmentioning

confidence: 99%

Late Palaeozoic tectonic transformation of the North Qinling Orogenic Belt: Insight from the geochronology, geochemistry and Sr‐Nd‐Hf isotopes of Carboniferous magmatic rocks

Liang,

Li,

Dong

et al. 2024

Geological Journal

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“…The 412–414 Ma Lajimiao mafic complex in southern NQB shows that the Proto‐Tethys did not close until ca. 410 Ma (Chang et al., 2021; Wu & Zheng, 2013).…”

Section: Geological Setting and Samplesmentioning

confidence: 99%

Slab Subduction and Pull Link Magmatism at Active and Passive Continental Margins

Dai,

Zhao,

Zhao

et al. 2024

Geophysical Research Letters

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Subduction leads to voluminous arc magmatism at active continental margins; however, the potential far‐field geodynamic connections with coeval magmatism along opposing passive margins, are rarely investigated. Here we report large‐scale and parallel mafic dike swarms on the South Qinling passive margin, whose geochemical features record the thick and cold subcontinental lithospheric mantle beneath passive margin was gradually replaced by thin and hot one during the early Paleozoic. The subduction of the Proto‐Tethys oceanic lithosphere led to arc magmatism along the active margin, shortly after the rift‐related mafic dike swarms occurred along the passive margin. Subsequent to the continuous oceanic subduction including the ridge‐margin collision, mantle upwelling and slab rollback eventually triggered large‐scale rift‐related magmatism and the opening of new ocean basin at passive margin, and also back‐arc magmatism on the active margin. We highlight slab subduction and pull link the geodynamic processes at active and passive continental margins, which improves our understanding of plate tectonics.

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“…Minerals 2022, 12, x FOR PEER REVIEW 2 of 22 detrital zircon grains from the clastic rocks [8], adakitic granitoids [9], and mafic complex [10] indicate that the closure time can be constrained at Devonian. Detrital zircon geochronology has been widely applied to investigate the orogenic event owing to the abundance of detrital zircon grains in the sedimentary rocks [11].…”

Section: Geological Backgroundmentioning

confidence: 99%

“…Previous studies investigated S-and I-type granitoids, high Ba-Sr dioritic intrusions, and high-pressure and ultrahigh-pressure rocks, suggesting that the closure time of the Shangdan Ocean spanned from Ordovician to Silurian [5][6][7]. However, detrital zircon grains from the clastic rocks [8], adakitic granitoids [9], and mafic complex [10] indicate that the closure time can be constrained at Devonian. Detrital zircon geochronology has been widely applied to investigate the orogenic event owing to the abundance of detrital zircon grains in the sedimentary rocks [11].…”

Section: Introductionmentioning

confidence: 99%

Timing, Provenance, and Tectonic Implications of Ore-Hosting Metasedimentary Rocks in the Giant Liba Gold Deposit, West Qinling Belt, China

Zhang

Liu

et al. 2022

Minerals

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The closure time of the Shangdan Ocean is critical for understanding the tectonic evolution of the Proto-Tethys Ocean. However, the proposed closure time was prolonged from Ordovician to Devonian. In the present study, detrital zircon from the metasedimentary rocks of the Liba Group in the West Qinling Belt was analyzed to constrain the closure time of the Shangdan Ocean. The three youngest grains from the Liba Group yield a maximum deposition age of 418 ± 13 Ma, indicating the Middle Devonian deposition. Detrital zircon grains show two main U–Pb age peaks of 810 Ma and 440 Ma with εHf(t) values spanning from −24.3 to +8.8 and −6.3 to +4.1, respectively, suggesting that the sediments of the Liba Group were derived from both the North and South Qinling Belts. The Lower Devonian in the South Qinling Belt shows similar provenance to the Liba Group, whereas sediments from the North Qinling Belt are absent in the Silurian strata of the South Qinling Belt. From Late Silurian to Early Devonian, the tectonic setting changed from subduction to collision. This evidence consistently suggests the disappearance of the Shangdan Ocean. The noticeable decrease in magmatism from 510–420 Ma to 420–390 Ma and the shrinking of εHf(t) values from −15.5–+12.8 to −8.4–+4.2 reveal that the Shangdan Ocean, as the eastmost embranchment of the Proto-Tethys Ocean, was closed at ca. 420 Ma.

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Zircon U–Pb geochronology and geochemistry of the Lajimiao mafic complex in the Shangdan Suture Zone, Qinling orogen: Petrogenesis and tectonic implications

Cited by 9 publications

References 67 publications

Late Palaeozoic tectonic transformation of the North Qinling Orogenic Belt: Insight from the geochronology, geochemistry and Sr‐Nd‐Hf isotopes of Carboniferous magmatic rocks

Late Palaeozoic tectonic transformation of the North Qinling Orogenic Belt: Insight from the geochronology, geochemistry and Sr‐Nd‐Hf isotopes of Carboniferous magmatic rocks

Slab Subduction and Pull Link Magmatism at Active and Passive Continental Margins

Timing, Provenance, and Tectonic Implications of Ore-Hosting Metasedimentary Rocks in the Giant Liba Gold Deposit, West Qinling Belt, China

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