Petrogenesis of Archean TTGs and potassic granites in the southern Yangtze Block: Constraints on the early formation of the Yangtze Block

Zhao, Tianyu; Li, Jing; Liu, Guichun; Cawood, Peter A.; Zi, Jian–Wei; Wang, Kai; Feng, Qinglai; Hu, Shaobin; Wen-tao, Zeng; Zhang, Hu

doi:10.1016/j.precamres.2020.105848

Cited by 40 publications

(9 citation statements)

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“…The Cuoke Complex is a newly recognized Archean to Paleoproterozoic basement unit from the previously mapped Paleo-to Mesoproterozoic Dahongshan Group in the southwestern Yangtze Block (Cui et al, 2019Liu et al, 2020). In the Cuoke area, many intrusive rocks are discontinuously distributed within ductile shear zones that transect the Dahongshan Group, from which the Paleoproterozoic Andichong unit dominated by gneissic monzogranite and granodiorite, and some Archean fragments were documented (Cui et al, 2019Cui X Z et al, in revision;Zhao et al, 2020). The Archean rocks are restricted to small isolated outcrops and are recognized as a TTG pluton dated at 3.1-3.06 Ga, some potassic granites aged ca.…”

Section: The Cuoke Complexmentioning

confidence: 99%

“…The Archean rocks are restricted to small isolated outcrops and are recognized as a TTG pluton dated at 3.1-3.06 Ga, some potassic granites aged ca. 2.92 Ga (Zhao et al, 2020), and some ca. 2.86 Ga granodiorites and monzogranites, which constitute the oldest granitoid suites so far identified in the southern Yangtze Block.…”

Section: The Cuoke Complexmentioning

confidence: 99%

“…2.86 Ga granodiorites and monzogranites, which constitute the oldest granitoid suites so far identified in the southern Yangtze Block. Rock geochemistry and isotopic data suggest that the older TTGs were formed through partial melting of juvenile mafic crust at low pressure with a minor contribution of older crustal materials, whereas the later potassic granites were formed by partial melting of pre -existing TTGs at higher pressure at middle to lower crustal levels (Zhao et al, 2020).…”

Section: The Cuoke Complexmentioning

confidence: 99%

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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: The Cuoke Complexmentioning

confidence: 99%

Section: The Cuoke Complexmentioning

confidence: 99%

Section: The Cuoke Complexmentioning

confidence: 99%

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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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“…Furthermore, they possess slightly negative to positive εHf (t) and εNd (t) values with two‐stage Hf model ages of 3,131–3,559 Ma, indicating that they originated from an isotopically juvenile Paleo‐Mesoarchean crust. Considering that the studied granitoids have comparable zircon εHf (t) values with the contemporaneous TTG (εHf (t) = −2.5–7.5) exposed in the Cuoke area, thermodynamic modeling with a starting composition of the average composition of the Cuoke TTGs has been carried out (Zhao et al., 2020). The modeling results demonstrate that anatexis of the contemporaneous TTG under pressures of 0.4–2.0 GPa yields much lower SiO 2 contents and K/Na ratios compared with the studied granitoids (Figures S7a, b in Supporting Information ).…”

Section: Discussionmentioning

confidence: 99%

Continental Crust Rejuvenation Across the Paleo‐Mesoarchean Transition Resulted From Elevated Mantle Geotherms

Lu,

Xu,

Wang

et al. 2024

Geophysical Research Letters

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The increase in initial Hf isotopes identified in early Mesoarchean detrital zircon is commonly interpreted as a reflection of the geodynamic transition from stagnant‐lid to mobile‐lid tectonics. However, given the lack of petrogenetic context, interpreting detrital zircon may lead to spurious conclusions. In this contribution, we use zircon U‐Pb‐Hf‐O isotopic and bulk rock compositions of newly identified 3.05–2.9 Ga granitoids from the SW Yangtze Block to posit petrogenesis within an isotopically juvenile magmatic system. A statistical analysis of these data with a global igneous zircon Lu‐Hf isotopic compilation reveals an increase in average initial radiogenic Hf isotopes during the Paleoarchean to Mesoarchean transition. We posit that the Earth's continental crust underwent a global rejuvenation across the Paleo‐Mesoarchean transition. This rejuvenation can be explained by an independently observed increase in mantle temperatures resulting from mantle thermal evolution and does not require a change in tectonic style.

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“…Li et al., 2018; K. Wang et al., 2018; Y. B. Wu et al., 2014; T. Zhao, Cawood, Zi, et al., 2019; T. Zhao, Cawood, Wang, et al., 2019; T. Zhao et al., 2020; G. Y. Zhou et al., 2018). Recently, ca.…”

Section: Discussionmentioning

confidence: 99%

Precambrian Tectonic Evolution of Southern Kongling Terrane, Yangtze Craton: Constraint From the Detrital Zircon U‐Pb Geochronology of the Metasedimentary Rocks

Jiang

Peng

Wang

2022

Earth and Space Science

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The Kongling terrane (Huangling dome) outcrops Precambrian metamorphic basement of the Yangtze craton. However, the Precambrian tectonic evolution of the southern Kongling terrane remains poorly constrained. In this contribution, we report zircon geochronology of the metasedimentary rocks from southern Kongling terrane of the Yangtze craton. Zircon U‐Pb dating results yielded magmatic age clusters at ca. 3,000 Ma, ca. 1,520 Ma, ca. 1,150 Ma, ca. 860 Ma, 900–920 Ma, and 980 Ma, and metamorphic age at ca. 2,900 Ma. These data display that the southern Kongling terrane witnessed Mesoarchean magmatism and metamorphic event, Mesoproterozoic and Neoproterozoic magmatism. In combination with previous studies, it is proposed that the Precambrian metamorphic basement of the Yangtze craton was amalgamated by the multi‐stage subduction‐collision processes at ca. 3,000–2,900 Ma, ca. 2,000–1,800 Ma, and ca. 1,100–940 Ma. In addition, the Proterozoic processes were related to the assembly and breakup of Columbia and Rodinia supercontinents.

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Petrogenesis of Archean TTGs and potassic granites in the southern Yangtze Block: Constraints on the early formation of the Yangtze Block

Cited by 40 publications

References 88 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

Continental Crust Rejuvenation Across the Paleo‐Mesoarchean Transition Resulted From Elevated Mantle Geotherms

Precambrian Tectonic Evolution of Southern Kongling Terrane, Yangtze Craton: Constraint From the Detrital Zircon U‐Pb Geochronology of the Metasedimentary Rocks

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