This paper presents age and geochemical data of a recently identified Late Paleozoic volcanic sequence in central Jilin Province, with aims to discuss the petrogenesis and to constrain the tectonic evolution of the Central Asian Orogenic Belt in this area. Firstly, the volcanic rocks have zircon U‐Pb ages of 290–270 Ma. Secondly, they are characterized by (a) ranging in composition from the low‐K tholeiite series to high‐K calc‐alkaline series; (b) enrichment in light rare earth elements and depletion of heavy rare earth elements, with negative Eu anomalies; and (c) negative Nb, Ta, and Ti anomalies. Finally, the volcanic rocks yield ∊_Hf(t) values of +7.1 to +17. These data suggest that the central Jilin volcanic rocks were possibly derived from predominant partial melting of a depleted lithospheric mantle that might have been modified by subducted slab–derived fluids. Combined with previous studies, the Late Paleozoic–Early Mesozoic magmatism in Central Jilin can be divided into two stages: (a) a volcanic arc stage (290–270 Ma) represented by low‐K to high–K, tholeiite to calc–alkaline plutons and (b) a syn–collisional stage (260–240 Ma) represented by high‐K calc–alkaline I‐type granites. Furthermore, the timing and the tectonic setting of the above magmatic rocks show that the arc was probably produced by the northward subduction of the Paleo‐Asian Ocean and that the final closure of the Paleo‐Asian Ocean occurred prior to the Early Triassic.

中文翻译：

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吉林中部锆石U – Pb地质年代学和早-Midlle二叠纪弧相关火山岩的成因：对中亚造山带东段构造演化的启示

本文介绍了吉林省中部最近发现的晚古生代火山岩层的年龄和地球化学数据，目的是讨论该地区的成因作用，并限制该地区中亚造山带的构造演化。首先，火山岩的锆石U-Pb年龄为290-270 Ma。其次，它们的特征是：（a）组成范围从低K钙黄榴石系列到高K钙碱性系列；（b）富集轻稀土元素和消耗重稀土元素，且Eu异常为负；（c）Nb，Ta和Ti负异常。最后，火山岩的屈服yield _Hf（t）的值在+7.1到+17之间。这些数据表明，吉林中部的火山岩可能是由贫化岩石圈地幔的主要部分融化而来的，该融化可能已经被俯冲的板状衍生流体修正了。结合以前的研究，吉林中部的晚古生代-早中生代岩浆作用可分为两个阶段：（a）火山弧阶段（290-270 Ma），以低钾到高钾，黄铁矿到钙-碱为代表lut和（b）以高K钙-碱性I型花岗岩为代表的同相-碰撞阶段（260-240 Ma）。此外，上述岩浆岩的时间和构造背景表明，该弧可能是由古亚洲洋的北向俯冲产生的，而古亚洲洋的最终封闭发生在三叠纪早期。