P-T-t evolution of Neoarchaean to Paleoproterozoic pelitic granulites from the Jidong terrane, eastern North China Craton

Lu, Jun‐Sheng; Zhai, Mingguo; Lu, Lin-Sheng; Zhao, Lei

doi:10.1016/j.precamres.2016.12.012

Cited by 62 publications

(23 citation statements)

References 79 publications

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“…A summary of detrital and metamorphic zircon data of granulite facies paragneisses (a) and their comparison with the magmatic ages of TTGs (b) from the East Hebei terrane (data from Bai et al, , ; Duan et al, ; Fu et al, ; Geng et al, ; Guo et al, ; Lu et al, ; Nutman et al, ; Yang et al, ; this paper; T. Liu, unpublished data)…”

Section: Discussionmentioning

confidence: 99%

“…The TTG gneisses and charnockites were emplaced as igneous protoliths at 2.58–2.50 Ga and metamorphosed at 2.53–2.48 Ga (Bai, Liu, Guo, & Wang, ; Bai et al, ; Duan et al, ; Geng et al, ; Lu et al, ; Nutman et al, ; Yang & Wei, ; Yang, Santosh, Collins, & Teng, ; Yang, Santosh, & Tsunogae, ). The pelitic granulites were argued to show either anticlockwise P–T paths with peak P–T conditions of ~9.8 kbar/~1,050°C (Duan et al, ) or clockwise P–T path with normal granulite facies condition of ~13 kbar/820–850°C (Lu et al, ), but share a similar deposition age of c. 2.5 Ga and metamorphic age of c. 2.48 Ga from zircon U–Pb dating (Duan et al, ; Lu et al, ). The mafic granulites are characterized by two‐pyroxene assemblages and are recognized to have anticlockwise P–T paths with the peak P–T conditions up to ~9 kbar/1,025–1,060°C (Yang & Wei, ), however, normal granulite facies conditions of 9.6–10.3 kbar/860–900°C were reported by Kwan et al ().…”

Section: Geological Settingmentioning

confidence: 99%

“…The high‐grade supracrustal rafts mainly include mafic and pelitic or greywacke granulites with interlayered banded iron formation (BIF). Although the granulites from Taipingzhai and Saheqiao areas were extensively studied in past decades, it is still disputable whether they are just normal granulite facies rocks with peak conditions mostly of 8–11 kbar/800–900°C (Chen & Li, ; He & Ye, ; Kwan, Zhao, Yin, & Geng, ; Lu, Zhai, Lu, & Zhao, ; Yang, Santosh, & Tsunogae, ; Zhao, Wilde, Cawood, & Lu, ), or UHT granulite facies rocks with peak conditions of 9–10 kbar/~1,000°C (Duan et al, ; Yang & Wei, ), and whether their P–T paths are anticlockwise (Duan et al, ; Kwan et al, ) or clockwise (Lu et al, ). Moreover, supracrustal rafts of granulite facies are also reported to occur in the Qian'an gneiss dome (Wu et al, ), and the mafic granulites from the western margin of the dome were revealed to have an anticlockwise P–T path with a UHT peak condition of 10–11 kbar/>1,000°C using REE‐based thermometers and phase equilibria modelling (Liu & Wei, ).…”

Section: Introductionmentioning

confidence: 99%

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MetamorphicP‒Tpaths and Zircon U–Pb ages of Archean ultra‐high temperature paragneisses from the Qian’an gneiss dome, East Hebei terrane, North China Craton

Liu

Wei

2020

Journal Metamorphic Geology

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The East Hebei terrane of North China Craton is characterized by the dome-and-keel structure, a common feature in most Archean cratons, where supracrustal rocks of granulite facies commonly occur as enclaves or rafts in tonalite-trondhjemite-granodiorite (TTG) gneisses. The metamorphic P-T paths of the granulites are significant for addressing the Archean tectonic regimes. Two types of granulite facies paragneiss with pelitic and greywacke compositions from the western margin of Qian'an gneiss dome are documented for their petrography, mineral chemistry, phase equilibria modelling using thermocalc, and zircon dating. Anticlockwise P-T paths involving the pre-peak pressure increase to the ultra-high temperature peak conditions and post-peak cooling and decompression processes were recognized. The pre-peak pressure increase process was constrained for a pelitic granulite mainly based on the spinel and cordierite inclusions in garnet and rutile corona around ilmenite, where the transition from spinel to garnet is modelled at 6-7 kbar at a fixed T = 1,000°C.For greywacke granulite, the pre-peak pressure increase evolution can be ascertained from the textural relation that orthopyroxene is surrounded by garnet, and the outwards increasing grossular (from 0.03 to 0.05) in the core of the atoll-like garnet (Grt-A), to occur from ~7 kbar at ~1,000°C. The peak P-T conditions for pelitic granulite are roughly limited to 7-11 kbar/890-1,050°C on the basis of the stability of the inferred peak assemblage involving garnet, perthite, sillimanite, rutile/ilmenite, and quartz. The peak P-T condition for greywacke granulite can be well constrained as 9-10 kbar/>1,000°C on the basis of the maximum grossular content (X Grs = 0.045-0.050) in the core of subhedral garnet (Grt-B) and the mantle of Grt-A together with an average re-integrated anorthite content (X An = 0.07) in K-feldspar.The peak temperature condition is consistent with the ternary feldspar thermometer results mostly of 950-1,020°C for antiperthite and perthite in greywacke granulite, and in accordance with the development of oriented needle-like exsolution of Ti±Fe oxides in garnet from pelitic granulite. The post-peak cooling and decompression process was consistent with the decreasing X Grs in the mantle of Grt-A and core of Grt-B in greywacke sample, and the final-stage cooling conditions can be well constrained from the stability of final assemblages marked by the later growth of biotite, as 8-9 kbar/820-880°C for pelitic granulite and 6-9 kbar/840-890°C for greywacke 330 | LIU and WEI the final pulse of the Neoarchean magmatic activity of TTGs that ranges from c. 2.56 to c. 2.48 Ga with a peak at c. 2.52 Ga. Combining the development of dome-andkeel structures, the penecontemporaneity between the metamorphism of supracrustal rocks and TTG magmatic activity, and also the unique anticlockwise P-T paths, we prefer a vertical sagduction regime to interpret the tectonic evolution of the East Hebei terrane, which may be also significant for other Archean cratons. K E Y...

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Section: Discussionmentioning

confidence: 99%

Section: Geological Settingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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MetamorphicP‒Tpaths and Zircon U–Pb ages of Archean ultra‐high temperature paragneisses from the Qian’an gneiss dome, East Hebei terrane, North China Craton

Liu

Wei

2020

Journal Metamorphic Geology

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“…NCI surfaces were calculated with the NCIPLOT program and visualized with the VMD program . The Fukui functions were obtained with the Multiwfn 3.7 program and visualized with the VMD program.…”

Section: Methodsmentioning

confidence: 99%

Computational Analysis of the Selective Formation of the C4α—C8′ Bond in the Intermolecular Coupling of Catechin Derivatives

et al. 2020

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Procyanidin B3 is a natural flavonoid composed of two catechins connected via a C4αC8′ bond. The couplings of catechin derivatives, promoted by Lewis acids, have been widely applied to the syntheses of procyanidin B3 and related flavonoids because the reactions construct the C4αC8′ bond in a highly stereo- and regioselective manner. However, the structural complexity of the catechin derivatives has complicated the exploration of a detailed mechanism for this selectivity. Here, we report the results of a computational study to provide plausible origins for the selective C4αC8′ bond formation of catechin derivatives 1 and 2 by using models 5 and 7. Although a systematic search did not provide SN2-like transition states, we successfully identified transition states TS-A, TS-B, and TS-C for the SN1-type C4αC8′, C4βC8′, and C4αC6′ bond formations, respectively, from a total of 233 transition states to justify the stereo- and regioselectivity of the experimental results. The analysis of these structures by NCIPLOT mapping and the distortion/interaction strain model suggests that the eclipsed interaction at the forming CC bond between the electrophile and the nucleophile destabilizes TS-B, while the strain of the electrophile destabilizes TS-C. Consequently, the C4αC8′ bond is formed via the lowest energy transition state TS-A.

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“…The oldest high-pressure granulite is Neoarchean (ca. 2.5 Ga) and is present in the Jianping complex; it was produced by a subduction-collision event in the eastern region of the North China Craton (Wei et al, 2001;O'Brien and Rötzler, 2003;Liu et al, 2011;Lu et al, 2017). The P-T conditions of this high-pressure granulite metamorphic event were 10-13 kbar and 780-850 °C (Wei et al, 2001;Wang and Cui, 1992;Lu et al, 2017;Fig.…”

Section: Secular Changes In the Geothermal Gradients Of Subduction Zonesmentioning

confidence: 99%

Paleoproterozoic high-pressure metamorphic history of the Salma eclogite on the Kola Peninsula, Russia

Imayama

Балтыбаев

et al. 2017

Lithosphere

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The Precambrian Salma eclogites on the Kola Peninsula, Russia, represent some of the oldest eclogites in the world; however, there has been much debate regarding whether the timing of their eclogite facies metamorphism is Archean (2.72-2.70 Ga) or Paleoproterozoic (1.92-1.88 Ga). New microstructural observations, pressure-temperature (P-T) analyses, zircon inclusion analyses, and U-Pb zircon dating performed in this study suggest that eclogite facies metamorphism occurred at ca. 1.87 Ga under P-T conditions of 16-18 kbar and 750-770 °C. Metamorphic zircons with the age of 1.87 Ga have inclusions of garnet (Grt) + omphacite (Omp) + Ca-clinopyoxene (Cpx) + amphibole (Amp) + quartz (Qz) + rutile (Rt) ± biotite (Bt), as well as flat heavy rare earth element (HREE) patterns due to the presence of abundant amounts of garnet during peak eclogite facies metamorphism. The Paleoproterozoic ages (1.92-1.88 Ga) presented in previous studies are reinterpreted to represent prograde ages, rather than peak ages, because these ages have been inferred from U-Pb dating in zoisite-bearing zircon and Sm-Nd and Lu-Hf geochronologic analyses of garnet showing growth zoning. In contrast, the 2.73-2.72 Ga unzoned zircons with dark cathodoluminescence contain inclusions of Grt + Amp + plagioclase (Pl) + Qz + rutile (Rt) ± Bt and are relatively enriched in HREEs, suggesting that an initial amphibolite facies metamorphic event occurred during the Archean. This study also proposes that the Salma eclogites underwent granulite facies retrograde metamorphism at 10-14 kbar and 770-820 °C, with rapid decompression occurring soon after peak metamorphism ca. 1.87 Ga. The final period of retrograde amphibolite facies metamorphism occurred at 8-10 kbar and 590-610 °C. Whole-rock chemical analyses indicate that the Salma eclogites were originally tholeiitic basalts formed at a mid-ocean ridge. The occurrence of eclogite facies metamorphism ca. 1.87 Ga suggests that the collision between the Kola and Karelian continents occurred during the Paleoproterozoic, rather than the Archean. These results, as well as those of previous studies, imply that the subduction required to form eclogites may have begun during or before the Paleoproterozoic.

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P-T-t evolution of Neoarchaean to Paleoproterozoic pelitic granulites from the Jidong terrane, eastern North China Craton

Cited by 62 publications

References 79 publications

MetamorphicP‒Tpaths and Zircon U–Pb ages of Archean ultra‐high temperature paragneisses from the Qian’an gneiss dome, East Hebei terrane, North China Craton

MetamorphicP‒Tpaths and Zircon U–Pb ages of Archean ultra‐high temperature paragneisses from the Qian’an gneiss dome, East Hebei terrane, North China Craton

Computational Analysis of the Selective Formation of the C4α—C8′ Bond in the Intermolecular Coupling of Catechin Derivatives

Paleoproterozoic high-pressure metamorphic history of the Salma eclogite on the Kola Peninsula, Russia

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