Zircon U–Pb age, Hf isotope and geochemistry of Carboniferous intrusions from the Langshan area, Inner Mongolia: Petrogenesis and tectonic implications

Liu, Min; Zhang, Da; Xiong, Guangqiang; Zhao, Haitao; Di, Yongjun; Zhong, Wang; Zhou, Zhengchao

doi:10.1016/j.jseaes.2016.01.005

Cited by 37 publications

(32 citation statements)

References 117 publications

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“…The recent identification of the Early Permian radiolarian fauna in the Solon Obo ophiolite belt confirms that the PAO closed no earlier than the Early Permian (Li, Chung, et al, ). It is suggested that the Carboniferous magmatic rocks formed from a calc‐alkaline magma, and most of them are adakitic (subduction‐related) and arc magmatic rocks with relatively low SiO 2 and high εHf( t ), representing the earlier episode of magmatism that involved more mantle‐derived magmas being introduced by subduction (Liu et al, ; Zhang, Zhao, Song, et al, ). Subsequently, the intensity of oceanic subduction decreased and the subducting plate moved closer to the southern block.…”

Section: Discussionmentioning

confidence: 99%

“…The Carboniferous, Permian, and Triassic intrusive rocks are distributed on both sides of the Huogeqi Fault. The Carboniferous intrusive rocks consist mainly of gabbros, diorites, and quartz diorites (Liu et al, ), and the Permian intrusive rocks mainly include monzogranite, granodiorite, and quartz diorite (Wang, Han, et al, ), while the Triassic intrusive rocks are mainly acidic and include granodiorite, monzogranite, and syenogranite (Figure c, Wang et al, , Wang, Xu, et al, , Wang et al, ).…”

Section: Geological Settingmentioning

confidence: 99%

“…Voluminous granitoids and associated rocks were formed from Carboniferous to Triassic in the LTB, providing a window to investigate the tectonic‐magmatic evolution and geodynamic background of the south‐eastern CAOB. Previous research work confirmed that the Carboniferous magmatism with arc‐related geochemical signatures formed during a continental arc setting (Liu et al, ; Tian et al, ) and the Triassic magmatism generated in a post‐collisional setting including highly fractionated and A‐type granitoids and alkaline intrusive complexes (Wang et al, ; Wang, Xu, Dong, Wang, & Li, ). However, the tectonic setting of the Permian magmatism in the area is still disputed.…”

Section: Introductionmentioning

confidence: 99%

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From subduction to post‐collision: Early Permian‐middle Triassic magmatic records from Langshan Belt, Central Asian Orogenic Belt

et al. 2020

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We performed geochronological and geochemical analyses of granitoids in the Langshan Tectonic Belt (LTB), southwest of the Solonker suture zone, for the determination of its age, petrogenesis, and tectonic setting, which are crucial for unravelling the Permian tectonic evolution in the south‐eastern Central Asian Orogenic Belt (CAOB). It is indicated by zircon U–Pb ages together with previous ages that the Permian igneous rocks within the LTB can be grouped into two episodes. The Early‐Middle Permian (~281–268 Ma) granitic intrusive rocks are mainly I‐type granitoids characterized by lithophile element enrichments, high‐field‐strength element depletions, and obvious negative Nb‐Ta‐Ti anomalies. These granitic intrusive rocks are further high‐K calc‐alkaline, arc‐related granitoids. In contrast, the Late Permian‐Middle Triassic (~260–241 Ma) granitoids contain relatively high SiO2, Al2O3, and Sr contents, but relatively low Y (Yb) contents and Mg# values, resembling the post‐collisional granitoids. Hf isotopic compositions of the two‐stage granitoids show similar features with both positive and negative values. The εHf(t) values of the four samples from −2.6 to +4.8 record predominantly Meso–Neoproterozoic crust components. According to the regional geological investigations and geochemical data, we suggest that the Early‐Middle Permian arc‐like granitoids formed in continental arc setting, which represents the final stage of Paleo‐Asian Oceanic subduction, and then the Late Permian‐Middle Triassic adakitic granitoids were probably formed in a post‐collisional setting due to the final closure of the Paleo‐Asian Ocean.

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Section: Discussionmentioning

confidence: 99%

Section: Geological Settingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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From subduction to post‐collision: Early Permian‐middle Triassic magmatic records from Langshan Belt, Central Asian Orogenic Belt

et al. 2020

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“…Isotopic ratios and element concentrations of zircons were calculated using Glitter. Concordia ages and diagrams were obtained using Isoplot/Ex (3.0) (Ludwig, Wang et al, 2015; (2) Liu et al, 2016a; (3) Dan et al, 2016;(4) Lin et al, 2014;(b) geological map of the southern Langshan, showing locations of samples and their zircon U-Pb data. 2003).…”

Section: Geological Backgroundmentioning

confidence: 99%

“…1b). Recent studies found various Paleozoic (mainly late Paleozoic) plutons widely exposed in the Langshan region Dan et al, 2016;Liu et al, 2016a), Fig. 1.…”

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Early Carboniferous High Ba‐Sr Granitoid in Southern Langshan of Northeastern Alxa: Implications for Accretionary Tectonics along the Southern Central Asian Orogenic Belt

Zheng

Zhang

et al. 2019

Acta Geologica Sinica (Eng)

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Voluminous granitoids are widely distributed in the Langshan region, northeast of the Alxa block, and record the evolutionary processes of the southern Central Asian Orogenic Belt. The Dabashan pluton was emplaced into the Paleoproterozoic Diebusige complex. Early Carboniferous zircon LA‐ICP MS U‐Pb ages were from 327 Ma to 346 Ma. The Dabashan pluton can be classified as monzogranite and syenogranite, and exhibits high K2O contents and K2O/Na2O ratios, which reveal a high‐K calc‐alkaline nature. The samples display strongly fractionated REE patterns, and are enriched in large ion lithophile elements (LILE) relative to high field strength elements (HFSE). The Dabashan plutons display unusually high Ba (823–2817 ppm) and Sr (166–520 ppm) contents and K/Rb ratios (315–627), but low Rb/Ba ratios (0.02–0.14), and exhibit fertile zircon Hf isotopic compositions [εHf(t)=–14 to –20], which are comparable to those of typical high Ba–Sr granitoids. Based on the geochemical compositions of the samples, we suggest that subducted sediments and ancient crustal materials both played important roles in their generation. Basaltic melts were derived from partial melting of subcontinental lithophile mantle metasomatized by subducted sediment‐related melts with residual garnet in the source, which caused partial melting of ancient lower crust. Magmas derived from underplating ascended and emplaced in the middle–upper crust at different depths. The resultant magmas experienced some degree of fractional crystallization during their ascent. Given these geochemical characteristics, together with regional tectonic, magmatic, and structure analysis data, an active continental margin environment is proposed for the generation of these rocks.

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Geochronology, geochemistry and Hf isotopic compositions of late Silurian granodiorites in the Shaolang River metallogenic belt: Implications for magmatism and tectonic evolution

Wang

Liu

et al. 2023

Geological Journal

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The Shaolang River metallogenic belt in Inner Mongolia is one of the main lead‐zinc polymetallic belt on the northern margin of the North China Plate. The granodiorites, which are closely coexisting with lead‐zinc veins in deposit, are extensively developed. Previous geochronological research results show that the dikes and veins in the metallogenic belt belong to the products of magmatic hydrothermal activity in the middle Yanshanian, so the genesis of the metallogenic belt deposit is generally considered to be a hydrothermal vein type deposit related to sub‐volcanic dikes. We obtained zircon LA‐ICP‐MS U–Pb ages and Hf isotopic compositions of granodiorites, which are widely distributed in the deposit and were considered to be closely connected with the genesis of the deposits. The zircon U–Pb ages are 419.4 ± 1.4 Ma and 424.5 ± 4.1 Ma for the granodiorites, respectively, and they formed in the late Silurian. The geological and geochemical data indicate that the granodiorites are consistent with the geochemical characteristics of typical adakite. All εHf(t) values of the granodiorites are minus, on the zircon Hf isotope age diagram, εHf(t) are below the evolution curve of chondrite. The two‐stage model ages (tDM2) are 2.45 ~ 2.79 Ga and 1.87 ~ 2.29 Ga, respectively, showing rock‐forming materials mainly derived from the Paleoproterozoic and earlier crustal partial melting, and there may have been mantle‐derived magma underplating of the lower crust. Combining with the previous regional research, it is concluded that the granodiorites were formed during the extinction of the island arc under the background of subduction of the Paleo‐Asian Ocean and North China Craton. Because of the 125 ~ 170 Ma metallogenic age, we concluded that the granodiorites in the ore areas have no obvious relationship with the deposit genesis. However, it provided the advantageous space for the formation of the lead‐zinc veins, it can be regarded as an important prospecting indicator in metallogenic belt.

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Zircon U–Pb age, Hf isotope and geochemistry of Carboniferous intrusions from the Langshan area, Inner Mongolia: Petrogenesis and tectonic implications

Cited by 37 publications

References 117 publications

From subduction to post‐collision: Early Permian‐middle Triassic magmatic records from Langshan Belt, Central Asian Orogenic Belt

From subduction to post‐collision: Early Permian‐middle Triassic magmatic records from Langshan Belt, Central Asian Orogenic Belt

Early Carboniferous High Ba‐Sr Granitoid in Southern Langshan of Northeastern Alxa: Implications for Accretionary Tectonics along the Southern Central Asian Orogenic Belt

Geochronology, geochemistry and Hf isotopic compositions of late Silurian granodiorites in the Shaolang River metallogenic belt: Implications for magmatism and tectonic evolution

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