【摘 要】
：
This paper emphasizes that the interactive constraints of geology and isotopic dating is the best approach to construct the geological event sequence, and has c
【机 构】
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and Key Laboratory of Lithospheric Tectonics and Lithoprobe Techniques
【基金项目】
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This study is supported by the project of NNSFC;the project of China Geological Survey;the project of the Ministry of Land and Resources;the IGCP project of the Ministry of Science and Technology
论文部分内容阅读
This paper emphasizes that the interactive constraints of geology and isotopic dating is the best approach to construct the geological event sequence, and has compiled 106 data of reasonable isotopic ages for the igneous rocks of the Yanshan belt. We propose a sequence of mgmatic-tectonic events in the Jurassic-Cretaceous Yanshan orogen of North China. Five orogenic episodes are divided, (1) pre-and initial orogenic episode (Early Jurassic); (2) early orogenic episode (Middle Jurassic); (3) peak orogenic episode (Late Jurassic); (4) late orogenic episode (early Early Cretaceous),and (5) post-orogenic episode. Each episode is a short cycle, all of the orogenic processes construct a longer cycle, and they, in general, followed a counter-clockwise (ccw) PTt path. Finally, it is suggested that the Yanshanian movement was so intensive that the magmatism and tectonic deformation had involved all the lithosphere thickness and the lateAchaean-formed cratonic lithosphere had been significantly reworked.
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