First report of phengites in the Longyou paragneiss in the northern Early Paleozoic Wuyi-Yunkai orogen, South China: P-T conditions, zircon U-Pb ages and tectonic implications

Tong, Lingling; Li, Chao; Zhao, Liang; Zhai, Mingguo; Li, Wuxian

doi:10.1016/j.jseaes.2021.104754

Cited by 9 publications

(4 citation statements)

References 51 publications

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“…Besides, zircon ε Hf (t) values from both plutons have large ranges, up to 10 ε units. The large ranges in zircon ε Hf (t) are either caused by magma mixing (Griffin et al, 2002) or by disequilibrium melting during the crustal anataxis (Tong et al, 2021). The magma mixing model is not favored here because mafic magmas mostly have low ASI values (<0.8) and the magma produced by pure mixing can hardly achieve the strong peraluminous affinity of our samples, while source mixing is more plausible.…”

Section: Origin Of the Two Peraluminous A-type Granitesmentioning

confidence: 84%

“…The orogeny of this early Paleozoic belt was first recognized by the mass distributions of the regional metamorphic rocks (greenschist, amphiboles, and minor granulites, Figure 1). Systematic geochronology studies of those metamorphic rocks were formed at 460-436 Ma (Yu et al, 2005;Yu et al, 2014;Li et al, 2010;Tong et al, 2021). The occurrence of high-pressure metamorphic rocks revealed crustal thickening events in the belt (Li et al, 2010;Yu et al, 2014;Tong et al, 2021).…”

Section: Tectonic Implicationmentioning

confidence: 99%

“…Systematic geochronology studies of those metamorphic rocks were formed at 460-436 Ma (Yu et al, 2005;Yu et al, 2014;Li et al, 2010;Tong et al, 2021). The occurrence of high-pressure metamorphic rocks revealed crustal thickening events in the belt (Li et al, 2010;Yu et al, 2014;Tong et al, 2021). The crustal thickening events were mainly suggested to be triggered by continental collision (Charvet et al, 2010;Li et al, 2010;Yao et al, 2012;Wang et al, 2013;Shu et al, 2014;Kong et al, 2021;Zhao et al, 2022).…”

Section: Tectonic Implicationmentioning

confidence: 99%

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Origin and implication of two newly identified peraluminous A-type granites in the early Paleozoic orogeny, Southeast Asia

Shu

Jiang²,

Wang³

et al. 2023

Front. Earth Sci.

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The amalgamation of the Yangtze and the Cathaysia Block in Neoproterozoic time led to the formation of the South China Block (SCB) and generated the Jiangnan Orogen with the occurrences of juvenile magmatic rocks. After this orogeny, a typical collisional orogen formed during the early Paleozoic period in Southeast Asia which is mainly distributed in the Wuyi-Nanling-Yunkai area in the SCB. However, the transitional time from syn-collisional compression to post-collisional extension is debatable. Here, we present new data on zircon U-Pb zircon ages, Lu-Hf isotopes, and geochemistry for the Guzhang and Shadi granites from the Nanling area, South China. Both plutons have similar zircon 238U/206Pb ages of ca. 430 Ma. Petrographic and geochemical characteristics (e.g., FeOt/(FeOt+MgO) = 0.82–0.95) indicate that both granites are peraluminous A-type, with high Ga/Al ratios (2.43–2.91) as well as high concentrations of Zr, Nb, Ce, Y (sum values from 327 to 527 ppm), and formation temperature (820°C–845°C). Shadi granite exhibit high positive εHf(t) values (clustering within 0 to +6) while Guzhang granite show relatively lower εHf(t) values (−8.7 to −2.9). Their mildly negative to positive zircon εHf(t) values are higher than that of many coeval granites and can be derived from anhydrous melting of tonalitic genesis in the middle crustal depth, with the Shadi pluton having more orthometamorphite in the source. The ages and Hf isotopic compositions of inherited zircons (εHf(t = 960 Ma) = 9.2, εHf(t = 950 Ma) = 7.3) suggest that the Neoproterozoic juvenile magmatic rocks in the Jiangnan Orogen were a significant source for these granites. We interpret these A-type granites derived at the post-collisional stage. Their occurrence indicates that the geological setting of this Paleozoic orogen shifted from compression to extension no later than 430 Ma.

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Section: Origin Of the Two Peraluminous A-type Granitesmentioning

confidence: 84%

Section: Tectonic Implicationmentioning

confidence: 99%

Section: Tectonic Implicationmentioning

confidence: 99%

See 1 more Smart Citation

Origin and implication of two newly identified peraluminous A-type granites in the early Paleozoic orogeny, Southeast Asia

Shu

Jiang²,

Wang³

et al. 2023

Front. Earth Sci.

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“…The final closure of the Paleo–South China Ocean occurred in the early Paleozoic along the Qinzhou–Hangzhou juncture belt (HQJB) that located at the junction of the Yangtze and Cathaysia blocks (Gilder et al, 1996; Qi et al, 2016; Yang et al, 2012), resulting in the collision between the Yangtze and Cathaysia blocks (Figure 9e). The main evidences are as follows: (1) the significant differences in the early Paleozoic sedimentary and biological assemblages suggest an early Paleozoic ocean between the Cathaysia and Yangtze blocks (Wu et al, 2020); (2) early Paleozoic accretionary complex (Ge et al, 2020; Li et al, 2022; Lu et al, 2020; Yang & Jiang, 2019; Zhao et al, 2019; Zhao et al, 2020), island‐arc magmatism (Liu et al, 2020; Yao et al, 2012; Zhang et al, 2016; Zhao et al, 2019) and SSZ‐type ophiolites (Li et al, 2022; Yang & Jiang, 2019) within the Cathaysia Block indicate that the Cathaysia Block is impossible as a unified block to collide with the Yangtze Block in the Neoproterozoic; and (3) extensive early Paleozoic amphibolite–granulite facies metamorphism and migmatism (Li et al, 2010; Tong et al, 2021; Wan et al, 2007) occurred below the Devonian angular unconformity in the Cathaysia Block (Figure 9e).…”

Section: Discussionmentioning

confidence: 99%

Zircon geochronology of the deformed matrix in the NE Jiangxi ophiolitic mélange belt: Time constraints on the Neoproterozoic evolution of the Paleo–South China Ocean and assembly of the Yangtze and Cathaysia blocks

et al. 2023

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The NE Jiangxi ophiolitic mélange belt is the key area for understanding the evolution of the Paleo‐South China Ocean and the assembly of the Yangtze and Cathaysia blocks. The age of the deformed matrix is closer to the tectonic emplacement time of the ophiolitic mélange than that of the blocks. However, the rock types, ages and structural deformation of the matrix in the NE Jiangxi ophiolitic mélange belt lack comprehensive understanding. Based on the zircon U–Pb geochronology, Hf isotope and trace element analyses of the deformed matrix in the NE Jiangxi ophiolitic mélange belt, we report the ages of meta‐rhyolite and tuffaceous phyllite to be 800–760 Ma, and the maximum depositional age of the clastic matrix is ~760 Ma. The youngest deformed matrix ages of 800–760 Ma constrain the tectonic emplacement age of the NE Jiangxi ophiolitic mélange belt to the late Qingbaikou period after 800–760 Ma and before the deposition of the Xiuning Formation (765–732 Ma). Zircon ages, trace element and Hf isotope compositions indicate that the 800–760 Ma matrix was formed in a back‐arc basin environment with obvious addition of 1000–800 Ma arc materials and recycled Paleoproterozoic crustal materials. The detrital material source areas were the 800–760 Ma arc and earlier accretionary wedge as juvenile crust. The multi‐stage arc magmatism, metamorphism and deformation in the NE Jiangxi ophiolitic mélange belt suggest that multi‐stage subduction of the Paleo‐South China Ocean and Neoproterozoic accretionary orogeny occurred during 1–0.76 Ga at the southeast margin of the Yangtze Block. Combined with the regional geological data, the Neoproterozoic back‐arc basin or the foreland basin around the Yangtze Block closed after ~760 Ma. The collision and amalgamation of the Yangtze and Cathaysia blocks resulted in the final closure of the Paleo‐South China Ocean, which have occurred in the early Paleozoic.

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Temperature and pressure dependence of P-wave velocity and electrical conductivity of gneiss: a review

Sun

Zhang

2021

Arab J Geosci

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First report of phengites in the Longyou paragneiss in the northern Early Paleozoic Wuyi-Yunkai orogen, South China: P-T conditions, zircon U-Pb ages and tectonic implications

Cited by 9 publications

References 51 publications

Origin and implication of two newly identified peraluminous A-type granites in the early Paleozoic orogeny, Southeast Asia

Origin and implication of two newly identified peraluminous A-type granites in the early Paleozoic orogeny, Southeast Asia

Zircon geochronology of the deformed matrix in the NE Jiangxi ophiolitic mélange belt: Time constraints on the Neoproterozoic evolution of the Paleo–South China Ocean and assembly of the Yangtze and Cathaysia blocks

Temperature and pressure dependence of P-wave velocity and electrical conductivity of gneiss: a review

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