Triassic volcanism along the eastern margin of the Xing'an Massif, NE China: Constraints on the spatial–temporal extent of the Mongol–Okhotsk tectonic regime
Triassic volcanism along the eastern margin of the Xing'an Massif, NE China: Constraints on the spatial–temporal extent of the Mongol–Okhotsk tectonic regime
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中国东北兴安地块东缘三叠纪火山活动：蒙古鄂霍次克构造体系时空范围的制约
DOI：
10.1016/j.gr.2017.05.002
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发表时间：
2017-08
影响因子：
6.1
通讯作者：
Zhao Shuo
中科院分区：
文献类型：
--
作者：
Li Yu;Xu Wenliang;Wang Feng;Pei Fuping;Tang Jie;Zhao Shuo
通过对兴安地块东缘沿着火山岩锆石U-Pb-Hf和全岩地球化学资料的研究，进一步认识了蒙古-鄂霍次克构造体制向东南方向俯冲的历史和空间范围。锆石U-Pb定年结果表明，兴安地块三叠纪火山活动分两期发生于中（约1000年）。242 Ma）和晚期（ca. 223-228 Ma）三叠纪。黑河地区中三叠世玄武安山岩与弧型火山岩有密切关系。锆石εHf（t）值（+8.5 ~+12.7）表明，原始岩浆是由相对亏损的地幔楔部分熔融而成，地幔楔被俯冲相关流体交代。汉达旗地区晚三叠世安山岩与高镁埃达克质安山岩具有地球化学相似性。锆石εHf（t）值（+ 11.5 ~+ 14.5）和TDM 2年龄（313-484 Ma）表明，它们的原始岩浆来源于年轻的俯冲洋壳的部分熔融，然后与地幔橄榄岩熔体发生相互作用。扎兰屯-莫古奇地区晚三叠世玄武安山岩、安山岩和英安岩具有与俯冲带形成的火成岩相似的特征。锆石εHf（t）值（+8.4 ~+15.4）和TDM 10年龄（260-542 Ma）表明，它们的原始岩浆来自于亏损地幔楔的部分熔融，该地幔楔被俯冲流体交代。这些资料表明，兴安地块三叠纪火山岩形成于活动大陆边缘环境，与蒙古-鄂霍次克洋板块向南俯冲有关。蒙古-鄂霍次克构造体制至少延伸至兴安地块东缘，构造活动时间从晚二叠世至早白垩世早期。
We present new zircon U–Pb–Hf and whole-rock geochemical data for volcanic rocks along the eastern margin of the Xing'an Massif of NE China in order to further our understanding of the history of subduction towards the SE and the spatial extent of the Mongol–Okhotsk tectonic regime. Zircon U–Pb dating indicates that the Triassic volcanism in the Xing'an Massif occurred in two stages during the Middle (ca. 242 Ma) and Late (ca. 223–228 Ma) Triassic. Middle Triassic basaltic andesites in the Heihe area have an affinity to arc-type volcanic rocks. The zircon εHf(t) values (+ 8.5 to + 12.7) suggest that the primary magma was generated by the partial melting of a relatively depleted mantle wedge that had been metasomatized by subduction-related fluids. The Late Triassic andesites in the Handaqi area exhibit geochemical affinities to high-Mg adakitic andesites. Their zircon εHf(t) values (+ 11.5 to + 14.5) and TDM2ages (313–484 Ma) indicate that their primary magma was derived from the partial melting of a young subducted oceanic crust, followed by interaction with melts derived from mantle peridotite. The Late Triassic basaltic andesites, andesites, and dacites in the Zhalantun–Moguqi area have features similar to those of igneous rocks formed in subduction zones. Their zircon εHf(t) values (+ 8.4 to + 15.4) and TDM1ages (260–542 Ma) indicate that their primary magma was derived from the partial melting of a depleted mantle wedge that had been metasomatized by subduction-related fluids. These data suggest that the Triassic volcanic rocks of the Xing'an Massif formed in an active continental margin setting associated with the southward subduction of the Mongol–Okhotsk oceanic plate towards the SE. We conclude that the Mongol–Okhotsk tectonic regime extended at least as far as the eastern margin of the Xing'an Massif, and that the tectonism spanned the period from the late Permian to early Early-Cretaceous.
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影响因子：
64.8
作者：
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