Metamorphic P–T paths and Zircon U–Pb age data for the Paleoproterozoic metabasic dykes of high-pressure granulite facies from Eastern Hebei, North China Craton

Duan, Zhanzhan; Wei, Chunjing; Qian, Jiahui

doi:10.1016/j.precamres.2015.10.015

Cited by 66 publications

(9 citation statements)

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“…and higher X Mg of 0.73 than ones in matrix. This overprinting is interpreted to relate with a late Palaeoproterozoic high‐ P granulite metamorphic event at c. 1.82 Ga that has been well identified on mafic dykes (Duan et al, ) and granulites (Chen & Li, ; Duan et al, ; Yang & Wei, ) as mentioned above.…”

Section: Discussionmentioning

confidence: 60%

“…A few mafic dykes that crosscut the Archean TTG gneisses and supracrustal rocks in the Saheqiao linear‐structural belt and the Taipingzhai ovate‐structural domain (Chen, ; Song, ) were proposed to have experienced high‐pressure (HP) granulite facies metamorphism with clockwise P–T paths and peak conditions of 11–13 kbar/790–810°C at c. 1.82 Ga (Duan, Wei, & Qian, ). This suggests that the Palaeoproterozoic tectonic events, including emplacement of metabasic dykes and HP granulite facies metamorphism prevailed in the Trans‐North China Orogen, have extended into the East Hebei terrane (Duan et al, ). In addition, Mesozoic granitoids are widely distributed in the East Hebei terrane, locally showing ductile shear deformation coupled with gold metallogenesis.…”

Section: Geological Settingmentioning

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: 60%

Section: Geological Settingmentioning

confidence: 99%

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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“…After rejecting nine analyses which might have suffered strong ancient loss of radiogenic Pb, the remaining 12 analyses yielded a weighted mean 207 Pb/ 206 Pb ages of 2501 ± 9 Ma (MSWD = 1.9) with Th/U ratios being 0.41-0.81, which is considered as the timing of regional granulite facies metamorphism. Analysis (spot #28) gave the youngest and concordant 207 Pb/ 206 Pb ages of 1912 ± 9 Ma, further proving that Paleoproterozoic metamorphic event did occur in Eastern Hebei [32].…”

Section: Sample J1349 (Dioritic Gneiss)mentioning

confidence: 76%

“…The North China Craton (NCC), preserving ∼3.85 Ga rocks, is one of the oldest cratonic blocks on earth [17][18][19][20], and was assembled through four micro-blocks with three Paleoproterozoic orogenic belts (Figure 1a) [21][22][23][24]. As a typical example of the Archean crust in the NCC, the Eastern Hebei terrane is composed predominantly of massive TTG gneisses, potassium-rich granitoids and minor dioritic gneisses, with supracrustal rocks consisting of ultramafic to felsic volcanic and sedimentary rocks [25][26][27][28][29][30][31][32][33][34][35][36][37][38][39]. The Eastern Hebei terrane had suffered multi-phase magmatic and tectono-thermal events and preserved a wide variety of Archean lithological associations.…”

Section: Introductionmentioning

confidence: 99%

Zircon U-Pb Dating and Metamorphism of Granitoid Gneisses and Supracrustal Rocks in Eastern Hebei, North China Craton

Duan

Wei

et al. 2022

Minerals

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Granitoid gneisses dominated by tonalitic–trondhjemitic–granodioritic (TTG) compositions, with metamorphic supracrustal rocks consisting of sedimentary and volcanic rocks, are widely exposed in the Eastern Hebei terrane, North China Craton (NCC). This study presents systematic zircon U–Pb geochronological and whole-rock geochemical data of the Neoarchean granitoid gneisses and supracrustal rocks in Eastern Hebei. Zircon U–Pb isotopic dating for the representative samples reveals that magmatic precursors of granitoid gneisses were emplaced between 2524 ± 7 and 2503 ± 12 Ma, and the protoliths of the pelitic granulites were deposited in the Late Neoarchean era. Both of them have been subjected to granulite facies metamorphism during 2508 ± 10 to 2468 ± 33 Ma, coeval with the intrusion of syenogranitic pegmatite (2488 ± 5 Ma). Zircon ages of 2.45–2.01 Ga obtained from the analyzed samples were considered mixed data from 2.53–2.48 Ga and 1.9–1.8 Ga and were chronologically meaningless. Paleoproterozoic metamorphic zircon ages of 1.9–1.8 Ga were usually neglected because of hardly being obtained from TTG gneisses and supracrustal rocks. The tectonic regime during the Neoarchean era was considered to be dominated by vertical tectonism in the Eastern Hebei terrane.

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“…Red-eye socket texture, represented by grt + qtz ± cpx replacing previous minerals of plagioclase and pyroxenes, is generally regarded as a post-peak metamorphic reaction, recording a near-isobaric cooling process (Jin et al, 1991;O'Brien et al, 2005). However, some recent studies have pointed out that 'red-eye socket' textures may form in the prograde metamorphic stages under fluid-absent conditions not in the post-peak metamorphic stages (Duan et al, 2015;Wei et al, 2014). Therefore, the red-eye socket texture could not represent an anticlockwise P-T path.…”

Section: Metamorphic P-t Conditions and Evolutionmentioning

confidence: 98%

Late Archean high-pressure pelitic granulites in the Yinshan Block, North China Craton

Wang

Guo

2017

Precambrian Research

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Ancient high-pressure metamorphism provides constraints for the understanding of Archean tectonic processes. Archean high-pressure metamorphic rocks, however, are rarely preserved in old cratons. Here, we report the newly discovered Archean high-pressure metapelites in the Yinshan Block of the North China Craton. The peak metamorphic stage (M2) is represented by kyanite, garnet, plagioclase, K-feldspar, quartz, rutile and melt. Kyanite was replaced by sillimanite during post-peak (M3) decompression process. Phase equilibria modelling in the MnNCKFMASHT system indicates nearly isothermal decompression with peak conditions of 840-870°C and >14-11 kbar. Secondary ion mass spectrometry (SIMS) zircon U-Pb dating of leucosome (13XWL35) and monazite U-Pb dating of kyanite-garnet-bearing metapelite (13XWL22) yield similar ages of $2520 Ma, which represent the crystallization age of granulite-facies melt. The high-pressure metapelites are enriched in Na 2 O (1.8-3.0 wt.%), MgO (3.4-5.7 wt.%), Cr (245-421 ppm) and Ni (21.0-91.9 ppm) contents, suggesting that volcanic rocks are probably the main sedimentary provenance. High d 18 O(WR) values (up to 12.4‰) and zircon oxygen isotopes (av. 11.4‰) of the metasediment source indicate they have undergone low-temperature alteration. The pressure-temperature-time constraints of this study provide a rare record indicating that surficial sediments have been buried to a depth of >40 km at ca. 2520 Ma in the Yinshan Block. Such crustal thickening, combined with available synchronous magmatism suggests that high-pressure metamorphism was triggered in a late Archean deep arc setting in the Yinshan Block of the North China Craton.

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Metamorphic P–T paths and Zircon U–Pb age data for the Paleoproterozoic metabasic dykes of high-pressure granulite facies from Eastern Hebei, North China Craton

Cited by 66 publications

References 93 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

Zircon U-Pb Dating and Metamorphism of Granitoid Gneisses and Supracrustal Rocks in Eastern Hebei, North China Craton

Late Archean high-pressure pelitic granulites in the Yinshan Block, North China Craton

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