Variable sediment flux in generation of Permian subduction-related mafic intrusions from the Yanbian region, NE China

Guo, Feng; Li, Hongxia; Wu, Fan; Li, Jingyan; Zhao, Liang; Huang, Miwei

doi:10.1016/j.lithos.2015.11.030

Cited by 85 publications

(52 citation statements)

References 95 publications

(143 reference statements)

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“…As shown in the figures plotting Ba/Th against Th/Nb, Th/Nb against La/Nb, and Th/Nb against Ba/Nb (Figure b–d), contributions of subducted sediment are mainly fluid mediated in the MOT SMIs but melt dominated in the SOT SMIs. To further estimate proportions of sediment melt and fluid injected into the melted basaltic magma source and to quantify differences in source characteristics found between the MOT and SOT, we completed incompatible trace element modelling calculations by adding sediment components to DM (e.g., Guo et al, ; Guo et al, ). We use SMIs with the highest MgO content levels drawn from the MOT and SOT to represent the compositions of more primitive magma during the modelling of the melting degree.…”

Section: Discussionmentioning

confidence: 99%

“…Sediments carried into the subduction channel melted due to increases in temperature and pressure and may have produced organic hydrocarbons (C n H m ; Song, Su, Niu, Lai, & Zhang, ; Figure ). Fluids and melts released from the subducted sediments (possibly also from the altered oceanic crust) modified the overlying mantle wedge (e.g., Choi et al, ; Guo et al, ; Guo et al, ). Different proportions of the subducted sedimentary component were injected into melted mafic magmas, producing the different melt compositions recorded in the SMIs.…”

Section: Discussionmentioning

confidence: 99%

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Geochemistry of silicate melt inclusions in middle and southern Okinawa Trough rocks: Implications for petrogenesis and variable subducted sediment component injection

Zeng

Yang

et al. 2018

Geological Journal

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Silicate melt inclusions (SMIs) in olivine, clinopyroxene, and orthopyroxene in basalt and trachyandesite of the middle Okinawa Trough (MOT) and in basaltic andesites of the southern Okinawa Trough (SOT) were investigated in detail to understand the evolution of magma and geochemical characteristics of the basaltic magma source. Both the SMIs and host bulk rocks are more heavily enriched with Pb and large ion lithophile elements than with high field strength elements and rare earth elements. The major element compositions of SMIs in the MOT trachyandesite show a scattered variation trend of medium‐K to shoshonitic series and suggest that a K‐rich magma source may exist in the Okinawa Trough. Two groups with distinct element distribution patterns observed in SMIs of the MOT trachyandesite may represent magmas with different evolutionary histories. Compared with fractional crystallization and partial melting processes, magma mixing may serve as a reasonable process for the production of trachyandesite in the MOT. Fractional crystallization has played an important role in basaltic magma evolution in the MOT and SOT. Simulations conducted using MELTS show that the fractional crystallization evolution trends observed correspond well to the presence of a magma chamber at 300 MPa with an H2O content level of 0.2 wt% in the MOT and to the presence of a magma chamber at 300 MPa with an H2O content level of 0.4 wt% in the SOT. Ratios of incompatible trace elements (e.g., Th/Ce, Th/Sm, Ba/Th, and Th/Nb); positive Pb anomalies; negative Nb, Ta, and Ti anomalies; and the existence of organic hydrocarbons (CnHm) in the SMIs can be attributed to the involvement of subducted sediment from the subducting slab. Modelling results suggest that more primitive magma represented by SMIs from the MOT has formed through the melting of less than 6% of a metasomatized depleted mantle with contributions of 1.2% sediment melt and 0.8% sediment fluid. In contrast, more primitive magma from the SOT formed through the melting of 4–10% of the depleted mantle with contributions of 3% sediment melt and 1% sediment fluid. The different features of the SMIs together with different tectonic settings of the MOT and SOT have formed in response to the westward subduction of the Philippine Sea Plate.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Geochemistry of silicate melt inclusions in middle and southern Okinawa Trough rocks: Implications for petrogenesis and variable subducted sediment component injection

Zeng

Yang

et al. 2018

Geological Journal

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“…Zhu and Ren, 2017) and between the Late Devonian and Early Carboniferous (Tang, 1989(Tang, , 1990Shao, 1991;Hong et al, 1995;Zhao et al, 1996). While others suggest that it occurred during the period from Permian to Triassic, which can be reclassified as, during the late Early Permian (Ren et al, 1980;Wang et al, 1991;Feng et al, 2010;Liu et al, 2010), from the Middle to Late Permian (Sengör et al, 1993;Chen et al, 2000Chen et al, , 2009Jian et al, 2010;Lin et al, 2013), during the Late Permian (Li, 2006;Wu et al, 2011), during the Late Permain to Early Triassic (Sengör et al, 1993;Li, 1998Li, , 2006Xiao et al, 2003;Sun et al, 2004;Zhang et al, 2004;Wu et al, 2007Wu et al, , 2011Xu et al, 2009;Peng et al, 2012;Cao et al, 2013;Eizenhöfer et al, 2014;Li et al, 2014;Wilde, 2015;Han et al, 2015;Guo et al, 2016), from the Late Permian to Middle Triassic (Jia et al, 2004;Wang F et al, 2015;Xiao et al, 2015;, and during the middle-late Triassic (Peng et al, 2012;Zhou and Wilde, 2013;…”

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confidence: 99%

Final Closure Time of the Paleo‐Asian Ocean: Implication from the Provenance Transformation from the Yangjiagou Formation to Lujiatun Formation in the Jiutai Area, NE China

Zhang

Liang

Liu

et al. 2019

Acta Geologica Sinica (Eng)

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The Jiutai area is tectonically situated at the eastern segment of the Central Asian Orogenic Belt (CAOB) and is close to the North China Craton (NCC) to the south, serving as an ideal place to investigations of the closure of the Paleo‐Asian Ocean (PAO). Sandstone samples collected from the Yangjiagou Formation and the Lujiatun Formation in this area have been studied in detail in terms of petrology, geochronology and geochemistry. The maximum depositional time of the Yangjiagou and Lujiatun formations has been constrained to early Middle Triassic (ca. 245 Ma) and middle Late Triassic (ca. 219 Ma), respectively. The Yangjiagou Formation, with a major provenance of dissected island arcs, is dominantly composed of Phanerozoic sediments from Northeastern China (NE China) massifs. The Lujiatun Formation, with major sediments from active continental margins, has a relatively larger proportion of Precambrian sediments, in which the ∼1.85 Ga and ∼2.5 Ga sediments are typical of the crystalline basements of the NCC and NE China massifs, which were uplifted and eroded during the closure of the PAO. Besides, both formations show the enrichment in LREEs and the depletion in HREEs, the common Eu negative anomalies, and trace element contents similar to that of the upper continental crust. Based on the provenance analysis of these two formations, the final closure time of the PAO in this area is constrained as from the early Middle Triassic (ca. 245 Ma) to the middle Late Triassic (ca. 219 Ma).

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“…Furthermore, the ratios of Nb/Ta, Zr/Hf, and Ba/Rb are 17.00 -19.53, 24.42-32.11, and 16.89-38.46, respectively, similar with the ratios of mantle magmas [56]. However, understanding the effects of crustal contamination on the mafic rocks is important because crustal contamination is almost inevitable during the ascent of mantle-derived melts through continental crust, and modifies the chemical and isotopic compositions during magma evolution [58]. The depletion of Nb and Ta implies that the parental magma of mafic rocks is related to crustal contamination or magma mixing during the ascent of magmas [59] or reflect magma generation in a subduction-related environment [60].…”

Section: Petrogenesis Of the Early Triassic Mafic Rocksmentioning

confidence: 69%

Final-Stage Magmatic Record of Paleo-Asian Oceanic Subduction? Insights from Late Permian to Early Triassic Intrusive Rocks in the Yanbian Area, Easternmost Central Asian Orogenic Belt

et al. 2020

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This paper reports new zircon LA–ICP–MS U–Pb and Hf isotope data, and whole-rock major and trace element data for Late Permian to Early Triassic intrusive rocks in the Yanbian area, NE China. These data provide new insights into the timing of the final subduction of the Paleo-Asian Ocean beneath the North China Craton. The zircon U–Pb age data indicate that a suite of Late Permian to Early Triassic intrusive rocks related to subduction is present within the Yanbian area. The Late Permian intrusive rocks consist of diorites while the Early Triassic granites and hornblende gabbros constitute a geochemically bimodal igneous rock association. Furthermore, the Early Triassic granites show the geochemical characteristics of shoshonitic rocks. All the rocks are characterized by enrichment in LILEs and LREEs, and depletion in HREEs and HFSEs, suggesting they formed in a subduction setting. Zircons from the Early Triassic gabbros have εHf(t) values and TDM2 ages of +7.6 to +10.7 and 735–1022 Ma, respectively, suggesting that they formed from a primary magma generated by the partial melting of lithospheric mantle material that had been previously modified by subduction-related fluids. The Late Permian diorites have εHf(t) values and TDM2 ages of +0.5 to +9.5 and 853 to 1669 Ma, respectively, while they have high contents of Al2O3, Fe2O3, and low contents of SiO2, Cr, and Ni, indicating Late Permian diorites should derive from the mantle and are influenced by some crustal material. Early Triassic granitic rocks have a wide range of εHf(t) values and TDM2 ages of −4.8 to +9.4 and 852 to 2136 Ma, respectively. Their zircons imply that the Early Triassic granites could be mainly derived from partial melting of the crust, with minor contribution of the crustal material of an ancient crust. The Early Triassic bimodal intrusive rocks in Yanbian area, combined with the regional geologic information; therefore, record a final post-subduction extensional environment due to the break-off of the previously subducted slab.

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Variable sediment flux in generation of Permian subduction-related mafic intrusions from the Yanbian region, NE China

Cited by 85 publications

References 95 publications

Geochemistry of silicate melt inclusions in middle and southern Okinawa Trough rocks: Implications for petrogenesis and variable subducted sediment component injection

Geochemistry of silicate melt inclusions in middle and southern Okinawa Trough rocks: Implications for petrogenesis and variable subducted sediment component injection

Final Closure Time of the Paleo‐Asian Ocean: Implication from the Provenance Transformation from the Yangjiagou Formation to Lujiatun Formation in the Jiutai Area, NE China

Final-Stage Magmatic Record of Paleo-Asian Oceanic Subduction? Insights from Late Permian to Early Triassic Intrusive Rocks in the Yanbian Area, Easternmost Central Asian Orogenic Belt

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