Metamorphism and geochronology of the Luoning metamorphic terrane, southern terminal of the Palaeoproterozoic Trans-North China Orogen, North China Craton

Chen, Hong‐Xu; Wang, Juan; Wang, Hao; Wang, Guo-Dong; Peng, Tao; Shi, Yonghong; Zhang, Qing; Wu, Chun‐Ming

doi:10.1016/j.precamres.2015.04.013

Cited by 63 publications

(15 citation statements)

References 105 publications

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“…The metamorphic peak assemblage (M2) is represented by the garnet porphyroblasts (Grt 2 , 15-20 vol %) plus matrix expense of the garnet and the adjacent matrix minerals, typifying the decompression process (e.g. Chen et al, 2015;Harley, 1989;Lu et al, 2013Lu et al, , 2014Xiao et al, 2011).…”

Section: Garnet-bearing Amphibolitementioning

confidence: 99%

Paleozoic subduction of the southern Dunhuang Orogenic Belt, northwest China: metamorphism and geochronology of the Shuixiakou area

et al. 2018

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Amphibolites in the Shuixiakou area of the southern Dunhuang Orogenic Belt, southernmost Central Asian Orogenic Belt (CAOB), occur as lenses within hornblende-biotite-plagioclase gneiss or pelitic schist, exhibiting block-in-matrix feature of tectonic mélange. Three generations of metamorphic mineral assemblages (M1, M2, and M3) have been recognized in the garnetbearing amphibolite lenses. The metamorphic prograde assemblage (M1) is documented with inclusion trails (hornblende + plagioclase + quartz) within garnet porphyroblasts, and are estimated to be formed under 610-690 °C and 6.5-10.2 kbar. The metamorphic peak assemblage (M2) consists of garnet + hornblende + clinopyroxene + plagioclase + quartz in the matrix and records metamorphic peak P-T conditions of 720-750 °C and 13.4-14.7 kbar. The retrograde assemblage (M3) is represented by the symplectic assemblage (hornblende + plagioclase + quartz ± biotite ± magnetite) rimming the garnet porphyroblast, formed in the decompression stage under P-T conditions of 630-730 °C and 3.8-7.2 kbar. The derived metamorphic P-T paths show similar tight clockwise loops including nearly isothermal decompression processes, typical of orogenic metamorphism. SIMS dating of metamorphic zircons from the amphibolites confirm that the high-pressure metamorphism (M2) occurred at ca. 438-398 Ma.

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Section: Garnet-bearing Amphibolitementioning

confidence: 99%

Paleozoic subduction of the southern Dunhuang Orogenic Belt, northwest China: metamorphism and geochronology of the Shuixiakou area

et al. 2018

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“…Recent studies indicate that amphibolites from the different areas of the Taihua metamorphic complex all record clockwise P-T paths (Jiang et al, 2011;Lu et al, 2013Lu et al, , 2014Wang et al, 2014a;Chen et al, 2015), and metamorphic geochronological data suggest that the Taihua metamorphic complex had experienced a Paleoproterozoic metamorphic event occurred from ~1.97 to 1.80…”

Section: Regional Geologymentioning

confidence: 99%

“…1a) is a continent-continent collisional belt formed due to the collision of the Eastern and Western Blocks at ca. 1.85 Ga (Zhao et al, 2001(Zhao et al, , 2005(Zhao et al, , 2012, whereas recent studies suggested that the TNCO is a long-lived collisional belt (Jiang et al, 2011;Wei et al, 2014;Chen et al, 2015); (2) The Trans-North China Belt whose boundaries are the same as the TNCO (Fig. 1a), formed through two Paleoproterozoic collisional events occurred at 2.1 Ga and 1.9−1.8 Ga, respectively.…”

Section: Introductionmentioning

confidence: 99%

“…Until recently, only sparse studies of the Taihua metamorphic complex at the southern margin of the NCC are available and these are mainly focused on metabasic rocks (Jiang et al, 2011;Lu et al, 2013Lu et al, , 2014Wang et al, 2014a) and some other metapelites (Jiang et al, 2011;Chen et al, 2015). This limits our further understanding of the tectonic process of these belts mentioned above, even the whole NCC.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, the Taihua metamorphic complex in the Wugang and Lushan area possibly experienced slightly higher grade metamorphism than the Huashan and Luoning area, implying the various depths of these blocks during metamorphism. Nevertheless, based on previous investigations(Jiang et al, 2011;Chen et al, 2015; Wang et al, 2014a; Lu et al, 2014) and this study, we may conclude that the Taihua metamorphic complex experienced the similar metamorphic process to the other Complexes in the NCC.High resolution SIMS U−Pb dating on the metamorphic zircons and the corresponding LA−ICP−MS trace element measurements implied that the Wugang metapelites record the peak or near peak metamorphic ages of ~1.92 Ga, which is coeval with that of the Wugang amphibolites (Lu et al, 2014). 40 Ar/ 39 Ar dating of biotite from the metapelitic sample L18 suggests that the Wugang metapelites might have kept cooling to 300 ºC as young as 1.83 Ga.…”

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confidence: 99%

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Metamorphic P–T–t path retrieved from metapelites in the southeastern Taihua metamorphic complex, and the Paleoproterozoic tectonic evolution of the southern North China Craton

Zhai

et al. 2017

Journal of Asian Earth Sciences

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Metamorphic evolution of garnet amphibolites from the Fuping Complex: Implications for the Paleoproterozoic subduction–collision history of the Trans‐North China Orogen

Wang,

Tang,

Santosh

et al. 2023

Geological Journal

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The Trans‐North China Orogen (TNCO) is a major Palaeoproterozoic collisional orogen in the North China Craton and has experienced complex tectonic evolution during the assembly of the Eastern and Western Blocks. The vestiges of subducted oceanic crust preserved in this orogen can be used to gain insights into the subduction–collision process associated with the Palaeoproterozoic orogeny. In this study, we investigate garnet amphibolites from the Wanzi Group in the Fuping Complex along the TNCO through integrated petrography, mineral chemistry, phase equilibrium modelling and zircon U–Pb geochronology. Three stages of metamorphic mineral assemblages are identified as follows: (i) the prograde assemblage is preserved as plagioclase, amphibole, biotite and quartz inclusions in garnet porphyroblasts; (ii) the peak mineral assemblage includes coarse‐grained amphibole, garnet, plagioclase, ilmenite, biotite and quartz; and (iii) the retrograde assemblage is mainly represented by the corona of amphibole, plagioclase and biotite in the matrix. Petrological features and phase equilibrium modelling define a clockwise pressure–temperature path involving a prograde stage of 7.2–9.6 kbar and <670°C, peak conditions of 10.0–10.2 kbar and 690–810°C, and a retrograde stage with near‐isothermal decompression to ~7.4 kbar and cooling. Zircon U–Pb dating shows weighted mean ages of 1848 ± 22 Ma and 1836 ± 31 Ma, representing the growth of zircon in the retrograde stage during the uplift and cooling process. In combination with available data from the TNCO, the post‐peak decompression and cooling process is inferred to be long‐lived during 1.90–1.76 Ga, following collision along the TNCO that occurred during 1.97–1.90 Ga, ultimately leading to the final assembly of the North China Craton.

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Metamorphism and geochronology of the Luoning metamorphic terrane, southern terminal of the Palaeoproterozoic Trans-North China Orogen, North China Craton

Cited by 63 publications

References 105 publications

Paleozoic subduction of the southern Dunhuang Orogenic Belt, northwest China: metamorphism and geochronology of the Shuixiakou area

Paleozoic subduction of the southern Dunhuang Orogenic Belt, northwest China: metamorphism and geochronology of the Shuixiakou area

Metamorphic P–T–t path retrieved from metapelites in the southeastern Taihua metamorphic complex, and the Paleoproterozoic tectonic evolution of the southern North China Craton

Metamorphic evolution of garnet amphibolites from the Fuping Complex: Implications for the Paleoproterozoic subduction–collision history of the Trans‐North China Orogen

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