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Milankovitch-driven cycles in the Precambrian of China:The Wumishan Formation

Journal of Palaeogeography 2013年第4期2卷 369-389页

作者： Mei Mingxiang Maurice E. Tucker State Key Laboratory of Geological Processes and Mineral Resources China University of Geosciences (Beijing) Department of Earth Sciences University of Durham

carbonate strata of the Mesoproterozoic Wumishan Formation in the Jixian area near Tianjin are ~3300 m thick and were deposited over some 100 million years(from ~1310±20 Ma to ~1207±10 Ma).Metre-scale cycles(parasequences) dominate the *** are generally of the peritidal carbonate type,and mostly show an approximately symmetrical lithofacies succession with thick stromatolite biostromes and small thromboliteoncolite bioherms constituting the central part and tidal-flat dolomites forming the upper and lower ***-supratidal dolomitic shales with palaeosol caps make up the topmost *** boundaries of the Wumishan cycles are typically exposure surfaces,and there is abundant evidence for fresh-water *** 1:4 stacking patterns indicate that the individual Wumishan cycles are sixthorder parasequences,with 4 parasequences constituting one fifth-order parasequence ***,5-8 beds or couplets,can be discerned in some of the *** regular vertical stacking pattern of beds within the sixth-order parasequences,forming the fifth-order parasequence sets,are interpreted as the result of environmental fluctuations controlled by Milankovitch rhythms,namely the superimposition of precession,and short and *** widespread 1:4 stacking pattern in the cyclic succession,as well as the local 1:5-8 stacking patterns of the beds within the cycles,suggest that the Milankovitch rhythms had similar ratios in the Mesoproterozoic as in the *** on the cycle stacking patterns,26 thirdorder sequences can be distinguished and these group into 6 second-order,transgressiveregressive megasequences(or sequence sets),all reflecting a composite,hierarchical succession of relative sea-level changes.

关键词： peritidal carbonate cycles Milankovitch rhythms Wumishan Formation Mesoproterozoic Tianjin North China

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