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Constraints on the timing of uplift of the Yanshan Fold and.pdf

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Constraints on the timing of uplift of the Yanshan Fold and

tters 246 (2006) 336–352 /locate/epslEarth and Planetary Science LeConstraints on the timing of uplift of the Yanshan Fold and Thrust Belt, North China Jin-Hui Yang a,?, Fu-Yuan Wu a, Ji-An Shao b, Simon A. Wilde c, Lie-Wen Xie a, Xiao-Ming Liu d a State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, P.O. Box 9825, Beijing 100029, China b Faculty of Earth and Space Sciences, Peking University, Beijing 100871, China c Department of Applied Geology, Curtin University of Technology, P.O. Box U1987, Perth, Western Australia 6845 d Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xian 750069, China Received 4 January 2006; received in revised form 18 April 2006; accepted 18 April 2006Editor: R.W. CarlsonAbstract This paper reports in situ U–Pb ages and Hf isotopic data on detrital zircons from Paleozoic to Late Mesozoic strata in the Xishan area near Beijing that provide important constraints on the evolution and paleogeography of the northern part of the North China Craton (NCC). Zircons from Carboniferous to Late Mesozoic sandstones are characterized by three major groups of U–Pb ages (2.5–2.3 Ga, 1.9–1.7 Ga and Late Phanerozoic ages). The Neoarchean and Paleoproterozoic zircons, and some Phanerozoic zircons, have negative εHf(T) values, similar to igneous zircons from intrusive rocks known from the NCC, indicating that the source of the sandstones was locally derived. However, Late Triassic to Late Jurassic (205–158 Ma) sandstones contain a group of Phanerozoic zircons with positive εHf(T) values, distinct from known igneous zircons in the NCC, suggesting an exotic source. The nearest potential source is the Xing-Meng Orogenic Belt (XMOB) to the north of the NCC, where considerable amounts of juvenile crustal materials exist. It is concluded that there are two sudden shifts in source provenances of the Xishan sediments; from the NCC before the Late Triassic, to a mixed sou