Geochemistry and geochronology of mylonitic metasedimentary rocks associated with the Proterozoic Miaowan Ophiolite Complex, Yangtze craton, China: Implications for geodynamic events

Jiang, Xingfu; Peng, Songbai; Polat, Ali; Kusky, Timothy M.; Wang, Lu; Wu, Tuoyu; Lin, Musen; Han, Qingsen

doi:10.1016/j.precamres.2016.04.004

Cited by 37 publications

(24 citation statements)

References 68 publications

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“…5 and 7). These, combined with the 1.12-0.98 Ga Miaowan ophiolite mélange from the nearby Kongling Complex (Peng S B et al, 2012), and 0.94 Ga metamorphism documented from the mélange, have led Jiang et al (2016) to propose a tectonic evolution from ca. 1.13 Ga intraplate or passive margin extension to oceanic subduction during 1.13-0.97 Ga and to arccontinental collision during 0.94-0.93 Ga in Miaowan-Shennongjia area of the northern Yangtze Block, and correlate it with the Rodinia assembly.…”

Section: Late Mesoproterozoic Tectonism Of South China In the Contextmentioning

confidence: 99%

Nature and Evolution of Pre‐Neoproterozoic Continental Crust in South China: A Review and Tectonic Implications

Kai

Dong

Yao

et al. 2020

Acta Geologica Sinica (Eng)

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South China as an amalgamation of the Yangtze and Cathaysia blocks is composed of Archean to Mesoproterozoic basement overlain by Neoproterozoic and younger cover. Both the constituent Yangtze and Cathaysia blocks contain well‐preserved Neoproterozoic rocks that have been extensively studied in terms of the age and tectonic nature, but less is known about their earlier crustal history due to the incomplete rock record. Recent efforts in investigating the yet survived crustal nature based on isotopic and elemental signatures preserved in igneous and sedimentary rocks have steadily improved our knowledge about the pre‐Neoproterozoic continental crustal evolution in South China. In this paper, we summarize the up‐to‐date pre‐Neoproterozoic records, including petrological, geochronological, geochemical and geophysical data, across South China, and discuss its spatiotemporal patterns of the pre‐Neoproterozoic crust and the relevant tectonic events. While the xenocrystic/inherited and detrital zircon records suggest widespread Archean (mainly ca. 2.5 Ga) crustal components within both the Yangtze and Cathaysia blocks, exposed Archean rocks are only limited to isolated crustal provinces in the Yangtze Block. These Archean rocks are dominated by TTGs (tonalite‐trondhjemite‐granodiorite) with varied ages (3.3–2.5 Ga) and zircon Hf isotopes, indicating a compositionally heterogeneous nature of the Archean Yangtze Block and, by inference, the development of multiple ancient terranes. The early Paleoproterozoic (2.4–2.2 Ga) tectonomagmatic events characterize the western Yangtze Block and are supportive of an east‐west subdivision of the Yangtze basement, whereas the late Paleoproterozoic (2.1–1.7 Ga) orogeneses may have affected a larger area covering both the western and eastern parts of the Yangtze Block, and also the Cathaysia Block. The eastern Yangtze Block with generally northeastward‐younging late Paleoproterozoic magmatism and metamorphism likely experienced a prolonged 2.05–1.75 Ga orogenic process welding the various Archean proto‐continents, consistent with the documentation of a buried late Paleoproterozoic orogenic belt imaged by deep seismic profiling from its central part and of a slightly older ophiolitic mélange in the northern part. The Cathaysia Block was probably involved in a short‐lived 1.9–1.8 Ga orogenic event. The two orogeneses overlapped in time and may have contributed to the cratonization of a possible unified South China, and are referred to be linked with the assembly of the Nuna Supercontinent. The subsequent late Paleoproterozoic to early Mesoproterozoic rift successions and intrusions (1.7–1.5 Ga) in the southwestern Yangtze Block, and the ca. 1.43 Ga rifting in Hainan Island of the Cathaysia Block could be responses to the Nuna break‐up. Late Mesoproterozoic (1.2–1.0 Ga) magmatism of varied age and nature in different localities of the Yangtze Block is reflective of a complex tectonic process in the context of the assembly of the Rodinia Supercontinent. Similar‐aged metamorphism (...

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Section: Late Mesoproterozoic Tectonism Of South China In the Contextmentioning

confidence: 99%

Nature and Evolution of Pre‐Neoproterozoic Continental Crust in South China: A Review and Tectonic Implications

Kai

Dong

Yao

et al. 2020

Acta Geologica Sinica (Eng)

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“…Of the 65 zircon grains analysed from the three mafic dike samples (13MYAP-01, 17MY-01, and 17MY-13), only one grain 5a), which is likely to be captured from the 3.0-2.9 Ga country TTG gneiss (Gao et al, 2011 (Jiang et al, 2016;Li et al, 2014;Wu et al, 2009;Zhang et al, 2006). Three samples yielded a consistent 207 Pb/ 206 Pb age of ca.…”

Section: Mafic Dikesmentioning

confidence: 99%

“…Neodymium isotopic results for the representative mafic dike samples in the southern Huangling dome are presented in Supplementary Jiang et al, 2016;Wu et al, 2009;Zhang et al, 2006). Therefore, it is necessary to identify the effect of metamorphism and deformation on the mobility of major and trace elements and whole-rock Sm-Nd isotopic composition of the mafic dikes in the southern Huangling dome.…”

Section: Sm-nd Isotopesmentioning

confidence: 99%

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Ca 2.85 Ga Nb‐enriched mafic dikes from the southern Huangling dome of the Yangtze Block, southern China: Implications for Mesoarchean subduction zone processes

et al. 2020

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In this study, we report the first occurrence of Archean Niobium-enriched mafic dikes in the southern Huangling dome within the Yangtze Block, southern China. Zircon U-Pb dating of three mafic dike samples yielded weighted mean 207 Pb/ 206 Pb ages of 2,858 ± 24 Ma (MSWD = 1.14), 2,889 ± 11 Ma (MSWD = 0.98), and 2,840 ± 11 Ma (MSWD = 0.17), respectively, which are interpreted as the intrusion ages of the dikes.Zircons from the host granodioritic gneiss show different trace element patterns and variable Eu anomalies, and yield an upper intercept age of 2,891 ± 32 Ma. On the basis of previous studies, the 2,891 Ma age is interpreted as the metamorphic recrystallization time caused by late tectono-thermal events. The mafic dikes possess high Nb contents ranging from 4.7 to 18.4 ppm, which are similar to those reported from Archean, Proterozoic, and Phanerozoic Nb-enriched basaltic rocks occurring worldwide. The Nb-enriched mafic dikes show HFSE-depleted patterns with significant negative Zr, Hf, and Ti anomalies, and higher Nb/U (8.29-48.42), Nb/Th pm (0.59-1.71), and Nb/La pm (0.76-1.34) ratios than "normal" island arc volcanic rocks that are consistent with a subduction zone geochemical affinity. Positive ε Nd(t) values (+5.0 to +11.8) of the Nb-enriched mafic dikes point to an extended depleted mantle characterized by elevated Sm/Nd ratio, whereas ε Nd(t) values (+0.3 to −2.3) and tectonic environment of the host granodioritic rocks, as well as the most widely accepted petrogenetic models of the TTG series indicate enriched mafic crustal sources. Therefore, we propose that the Nb-enriched mafic dikes were generated from a depleted mantle with an extended history of elevated Sm/Nd ratio that was metasomatized by slab-derived melts at ca. 2.90-2.85 Ga.

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“…ACTA GEOLOGICA SINICA (English Edition) http://www.geojournals.cn/dzxben/ch/index.aspx http://mc.manuscriptcentral.com/ags Apart from ocean-related magmatism, there were two main subduction-related metamorphic stages in the JO. One period of amphibolite facies metamorphism occurred between 942 and 935 Ma and represents the time of the collision between the protocratonic Yangtze Block with the Rodinia supercontinent (Jiang et al, 2016). The other stage, between 912 and 835 Ma, was correlated to the collision of the Yangtze and Cathaysia Blocks (Yan et al, 2015).…”

Section: Comparing the Yuanbaoshan Region With The Eastern Jo And Genmentioning

confidence: 99%

Neoproterozoic–Early Paleozoic Tectonic Evolution of the South China Craton: New Insights from the Polyphase Deformation in the Southwestern Jiangnan Orogen

Zhao

et al. 2018

Acta Geologica Sinica (Eng)

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A >1500–km–long northeast–southwest trending Neoproterozoic metamorphic belt in the South China Craton (SCC) consists of subduction mélange and extensional basin deposits. This belt is present under an unconformity of Devonian–Carboniferous sediments. Tectonic evolution of the Neoproterozoic rocks is crucial to determining the geology of the SCC and further influences the reconstruction of the Rodinia supercontinent. A subduction mélange unit enclosed ca.1000–850–Ma mafic blocks, which defined a Neoproterozoic ocean that existed within the SCC, is exposed at the bottom of the Jiangnan Orogen (JO) and experienced at least two phases deformation. Combined with new (detrital) zircon U–Pb ages from metasandstones, as well as igneous rocks within the metamorphic belt, we restrict the strongly deformed subduction mélange as younger than the minimum detrital age ca. 835 Ma and older than the ca. 815 Ma intruded granite. Unconformably overlying the subduction mélange and the intruded granite, an intra–continental rift basin developed <800 Ma that involved abundant mantle inputs, such as mafic dikes. This stratum only experienced one main phase deformation. According to our white mica 40Ar/30Ar data and previously documented thermochronology, both the Neoproterozoic mélange and younger strata were exhumed by a 490–400–Ma crustal–scale positive flower structure. This orogenic event probably induced the thick–skinned structures and was accompanied by crustal thickening, metamorphism and magmatism and led to the closure of the pre–existing rift basin. Integrating previously published data and our new results, we agree that the SCC was located on the periphery of the Rodinia supercontinent from the Neoproterozic until the Ordovician. Furthermore, we prefer that the convergence and dispersal of the SCC were primarily controlled by oceanic subduction forces that occurred within or periphery of the SCC.

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Geochemistry and geochronology of mylonitic metasedimentary rocks associated with the Proterozoic Miaowan Ophiolite Complex, Yangtze craton, China: Implications for geodynamic events

Cited by 37 publications

References 68 publications

Nature and Evolution of Pre‐Neoproterozoic Continental Crust in South China: A Review and Tectonic Implications

Nature and Evolution of Pre‐Neoproterozoic Continental Crust in South China: A Review and Tectonic Implications

Ca 2.85 Ga Nb‐enriched mafic dikes from the southern Huangling dome of the Yangtze Block, southern China: Implications for Mesoarchean subduction zone processes

Neoproterozoic–Early Paleozoic Tectonic Evolution of the South China Craton: New Insights from the Polyphase Deformation in the Southwestern Jiangnan Orogen

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