Tectonic evolution of the Dadongcha Formation, Ji'an group, Qinghe area, Tonghua, NE China: Implications from geochronological and geochemical evidence of metapelites

Zhu, Erlin; Liang, Chenyue; Zheng, Changqing; Yang, Yan; Zhou, Xiangyu; Zhang, Qian; Hu, Pengyue

doi:10.1016/j.precamres.2020.105917

Cited by 3 publications

(14 citation statements)

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“…Combined with the minimum peak ages of detrital zircons, the deposition ages for the Mayihe, Huangchagou and Dadongcha formations can be constrained to be 2141-1946, 2117-1917 and 2017-1917 Ma, respectively (Figure 8). These ages are similar to the depositional ages suggested by other authors [33][34][35].…”

Section: Geochronology Of the Ji'an Group And Related Granitessupporting

confidence: 91%

“…The Ji'an Group is divided into Mayihe, Huangchagou and Dadongcha formations from the bottom upwards (Figure 3). The sediments are considered to have been deposited in an active continental margin environment at 2.2-1.9 Ga [33][34][35] and generally experienced greenschist to low-amphibolite facies metamorphism, with some parts of the sequence attaining high-amphibolite to granulite facies [11,[35][36][37]. [6]).…”

Section: Geological Backgroundmentioning

confidence: 99%

“…65-0.52 GPa, which was previously attributed to amphibolite facies metamorphism with anticlockwise P-T paths [24]. However, recent phase equilibria models of some metapelites in the Ji'an Group limit the the P-T conditions of the peak stages to ~1.0-0.7 GPa/890-820 • C and the retrograde stages to ~0.7-0.5 GPa/760-620 • C, which have been attributed to granulite facies metamorphism with clockwise P-T paths (Figure 5, [18,[35][36][37]).…”

Section: P-t Pathsmentioning

confidence: 99%

“…The chemical composition of sedimentary rocks depends on the composition of its source rocks. Here, we reconstruct the source properties by some specific discrimination diagrams [47] based on the geochemical data in the literature [33,35,46]. In the (al + fm)-(c + alk) diagram (Figure 6c), the data fall in the area of the pelitic sedimentary rocks.…”

Section: Metasedimentary Rocksmentioning

confidence: 99%

“…The geochronology of the metasedimentary rocks and related granites can provide significant constraints on the formation of the JLJB. Based on the published zircon isotope geochronology data, zircon trace element data (e.g., Th and U) and the geochronological outline of the metamorphism and magmatism in the Ji'an Group [9,34,35,38,43,48], we provide constraints in the petrogenic age of the protoliths (detrital zircons with Th/U > 0.4), the metamorphic age of the metasedimentary rocks (metamorphic zircons with Th/U < 0.1) and the Paleoproterozoic magmatism (magmatic zircons with Th/U > 0.4). The metamorphic zircons in the Ji'an Group suggest that the metamorphism can be divided into two periods of 1950-1870 Ma and 1870-1800 Ma, with peak ages of 1901 Ma and 1860 Ma, respectively (Figure 7c).…”

Section: Geochronology Of the Ji'an Group And Related Granitesmentioning

confidence: 99%

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Tectonic Evolution of the JLJB, North China Craton, Revisited: Constraints from Metamorphism, Geochemistry and Geochronology of the Ji’an Group and Related Granites

et al. 2023

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The Jiao-Liao-Ji Belt (JLJB) is the most representative Paleoproterozoic orogenic belt in the North China Craton (NCC). The sedimentation, metamorphism and magmatism of the Ji’an Group and associated granites provide significant insights into the tectonic evolution of the JLJB. In this study, we have synthesized published geochemistry and geochronology data on metasedimentary, metavolcanic and igneous rocks. According to the available data, the protoliths of the metasedimentary rocks are sets of shale, wacke, arkose, quartz sandstone and carbonate, while the protoliths of the metavolcanic rocks are calc-alkaline basalt, basaltic andesite, andesite, dacite and rhyolite. The rock assemblages indicate a transformation of the tectonic environment from a passive margin to an active continental margin following the onset of plate convergence and subduction. The A2-type gneissic granite (Qianzhuogou pluton) is formed in a subsequent back-arc basin extension setting at 2.20–2.14 Ga. The Ji’an Group was finally deposited in an active continental margin during the closure of a back-arc basin at 2.14–2.0 Ga. Then, the sediments were involved in a continent–arc–continent collision between the Longgang and Nangrim blocks at ~1.95 Ga. This process was accompanied by HP granulite-facies metamorphism at ~1.90 Ga. The subsequent exhumation and regional extension resulted in decompression melting during 1.90–1.86 Ga, producing metamorphism with an isothermal decompression clockwise P–T path. The resulting metapelites are characterized by perthite + sillimanite, and mafic granulites are characterized by orthopyroxene + clinopyroxene. The S-type porphyritic granite (Shuangcha pluton) is formed during the crustal anatexis. Meanwhile, extensive anatexis produced significant heating and triggered prograde to peak metamorphism with an anticlockwise P–T path. Cordierite-bearing symplectites around the garnet in the metapelites indicate a superposed isobaric cooling metamorphism. The ages of monazites and anatectic zircons suggest that the post-exhumation cooling occurred at 1.86–1.80 Ga. The Paleoproterozoic magmatism, sedimentation and metamorphism suggest a process of subduction back-arc basin extension and closure, collision and exhumation for the tectonic evolution of the JLJB.

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Section: Geochronology Of the Ji'an Group And Related Granitessupporting

confidence: 91%