High-pressure felsic granulites in association with pelitic granulites are widely distributed in the Qianlishan Complex of the Khondalite Belt, North China Craton. A link between “inter-layered” felsic and pelitic granulites was established based on comprehensive metamorphic analysis, revealing that they record similar metamorphic stages: peak pressure (M1), post-peak decompression (M2), and late retrograde cooling (M3) stages. Felsic granulites experienced high-pressure metamorphism up to ∼12 kbar, while pelitic granulites estimated peak pressure is 11–15 kbar. The decompression stage (M2) is indicated by cordierite + sillimanite symplectite and/or cordierite coronae with conditions of 5.7–6.5 kbar/800–835 °C in pelitic granulites, and by garnet-sillimanite assemblages with conditions of >6.5 kbar/810–865 °C in felsic granulites. The later cooling stage (M3) is marked by sub-solidus biotite-quartz-plagioclase symplectite and later melt crystallization. These mineral assemblages and pressure-temperature (P-T) conditions define clockwise P-T paths involving near-isothermal decompression and near-isobaric cooling, suggesting a continent-continent collisional event. Secondary ion mass spectrometry zircon U-Pb dating yields a consistent metamorphic age of ca. 1.95 Ga, interpreted as peak metamorphism. The results, combined with available data, suggest that the Khondalite Belt formed by collision between the Yinshan and Ordos blocks at ca. 1.95 Ga.

中文翻译：

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前里山复杂高压长英质和泥质花岗岩的变质作用及其对华北克拉通高棉岩带的构造意义

高压长英质花岗质花岗岩与黄铁质花岗质花岗岩相结合，广泛分布在华北克拉通高棉岩带前里山情结中。基于全面的变质分析，建立了“层状”长英质和珍珠质花岗岩之间的联系，表明它们记录了相似的变质阶段：峰值压力（M1），峰后减压（M2）和逆行降温后期（M3） 。长英质花岗石经历了高压变质作用，直至约12 kbar，而长方体花岗石估计的峰值压力为11–15 kbar。减压阶段（M2）由堇青石+硅线石的共沸物和/或堇青石的日冕表示，条件为5.7–6.5 kbar / 800–835°C（在黄土粒料中），石榴石-硅线石的组合条件> 6.5 kbar / 810– 865°C的长英质花岗岩中。较晚的冷却阶段（M3）以亚固相黑云母-石英-斜长石手榴石和随后的熔融结晶为特征。这些矿物组合和压力-温度（PT）条件定义了顺时针PT路径，涉及接近等温的减压和接近等压的冷却，这暗示了大陆-大陆碰撞事件。二次离子质谱法锆石U-Pb测年可得出约一致的变质年龄。1.95 Ga，解释为峰变质。研究结果与现有数据相结合，表明由金山和鄂尔多斯地块在约１９００年之间的碰撞形成的昆多岩带。1.95 Ga。这些矿物组合和压力-温度（PT）条件定义了顺时针PT路径，涉及接近等温的减压和接近等压的冷却，这暗示了大陆-大陆碰撞事件。二次离子质谱法锆石U-Pb测年可得出约一致的变质年龄。1.95 Ga，解释为峰变质。研究结果与现有数据相结合，表明由金山和鄂尔多斯地块在约１９００年之间的碰撞形成的昆多岩带。1.95 Ga。这些矿物组合和压力-温度（PT）条件定义了顺时针PT路径，涉及接近等温的减压和接近等压的冷却，这暗示了大陆-大陆碰撞事件。二次离子质谱法锆石U-Pb测年可得出约一致的变质年龄。1.95 Ga，解释为峰变质。研究结果与现有数据相结合，表明由金山和鄂尔多斯地块在约１９００年之间的碰撞形成的昆多岩带。1.95 Ga。认为昆山带是由约山的印山和鄂尔多斯地块碰撞形成的。1.95 Ga。认为昆山带是由约山的印山和鄂尔多斯地块碰撞形成的。1.95 Ga。