Abstract The Qianlishan Complex is a multiply deformed granulite terrane of the Khondalite Belt that represents a Paleoproterozoic continent-continent collisional orogen in the Western Block of the North China Craton. Two major stages of deformation (D1 and D2) were identified in the Qianlishan Complex. D1 mainly produced NWW-trending overturned to recumbent intrafolial isoclinal folds F1, sub-horizontal penetrative foliations S1, NNE-SSW mineral lineations L1 associated with top-to-the-SSW thrust shear, reflecting crustal thickening due to the NNE-SSW compression. D1 was developed with the prograde (M1) and peak (M2) granulite-facies metamorphism. D2 successively superposed the D1 structures and was characterized by NWW-SEE-trending doubly plunging open to tight upright folds F2 and minor sub-vertical axial planar foliations/cleavages S2. D2 was accompanied by post-peak near-isothermal decompression (M3), probably related to exhumation following the crustal thickening. SIMS U–Pb zircon ages of deformation-related leucocratic dykes demonstrate that D1 broadly occurred at 1976–1936 Ma and D2 subsequently happened at 1936–1854 Ma. These results indicate that the Khondalite Belt underwent long-term (~100 Myr) polyphase deformation and high-grade metamorphism associated with magmatism. Timing constraints and kinematic compatibility suggest that the deformation sequence resulted from the NNE-SSW collision between the Yinshan and Ordos Blocks to form the Western Block at ~1.95 Ga.

中文翻译：

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华北孔达岩带千里山杂岩变形史：构造、时代和构造意义

摘要 千里山杂岩是华北克拉通西部地块古元古代陆陆碰撞造山带孔达岩带的多变形麻粒岩地体。在千里山杂岩中确定了两个主要的变形阶段（D1 和 D2）。D1 主要产生 NWW 向倾覆到横卧叶内等斜褶皱 F1、亚水平穿透叶理 S1、NNE-SSW 矿物线理 L1 与顶部到 SSW 的逆冲剪相关，反映了由于 NNE-SSW 压缩导致的地壳增厚。D1 是随着前进 (M1) 和峰 (M2) 麻粒岩相变质作用发育的。D2 依次叠加在 D1 结构上，其特征是 NWW-SEE 趋势双张开至紧密的直立褶皱 F2 和较小的亚垂直轴向平面叶理/解理 S2。D2 伴随着峰后近等温减压（M3），可能与地壳增厚后的剥露有关。变形相关白斑岩脉的 SIMS U-Pb 锆石年龄表明 D1 广泛发生在 1976-1936 Ma，D2 随后发生在 1936-1854 Ma。这些结果表明孔达岩带经历了与岩浆作用相关的长期（~100 Myr）多相变形和高等级变质作用。时间限制和运动学兼容性表明，变形序列是由阴山和鄂尔多斯地块之间的 NNE-SSW 碰撞形成的，在~1.95 Ga 形成了西部地块。变形相关白斑岩脉的 SIMS U-Pb 锆石年龄表明 D1 广泛发生在 1976-1936 Ma，D2 随后发生在 1936-1854 Ma。这些结果表明孔达岩带经历了与岩浆作用相关的长期（~100 Myr）多相变形和高等级变质作用。时间限制和运动学兼容性表明，变形序列是由阴山和鄂尔多斯地块之间的 NNE-SSW 碰撞形成的，在~1.95 Ga 处形成西部地块。变形相关白斑岩脉的 SIMS U-Pb 锆石年龄表明 D1 广泛发生在 1976-1936 Ma，D2 随后发生在 1936-1854 Ma。这些结果表明孔达岩带经历了与岩浆作用相关的长期（~100 Myr）多相变形和高等级变质作用。时间限制和运动学兼容性表明，变形序列是由阴山和鄂尔多斯地块之间的 NNE-SSW 碰撞形成的，在~1.95 Ga 处形成西部地块。