MEI Ming xiang, XU De bin, ZHOU Hong rui. Genetic Types of Meter-Scale Cyclic Sequences and Their Fabric Features of Facies-Succession[J]. Acta Sedimentologica Sinica, 2000, 18(1): 43-49.
| Citation:
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MEI Ming xiang, XU De bin, ZHOU Hong rui. Genetic Types of Meter-Scale Cyclic Sequences and Their Fabric Features of Facies-Succession[J]. Acta Sedimentologica Sinica, 2000, 18(1): 43-49.
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Genetic Types of Meter-Scale Cyclic Sequences and Their Fabric Features of Facies-Succession
- Received Date: 1998-08-17
- Rev Recd Date:
1999-04-20
- Publish Date:
2000-03-10
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Abstract
Different types of meter-scale cyclic sequences in stratigraphical records are the outcomes of episodic accumulation of strata related to Milankovitch cycles. They are marked by particular features of facies-successions resulted from different sediment source and sedimentary dynamics in different paleogeographic background, which become the fundmental rule on the division of meter-scale cyclic sequences. The widespread development in stratigraphic records and the regularly vertical stacking-patterns in long-term sequence, the evolution characters of earth-history and the genetic types reflected by particular fabric features of facies-succession in different paleogeography background, all of these features shows that meter-scale cyclic sequences are not only the fundmental working-unit on stratigraphy and sedimentology but also the replenish and extention of parasequence in sequence stratigraphy.There are generally two kinds of facies-succession for meter-scale cyclic sequcence in neretic-facies strata of carbonates as well as clastic rock, which are normal grading succession mainly formed by tidal sedimentation and inverse grading succession mainly made by wave sedimentation, both of them constitutes generally upward shallowing succession, the thickness of succession is from several tens centimeters to several meters. In terms of fabric features of facies-succession,it can be made the division of genetic types for meter-scale cyclic sequences. Carbonate meter-scale cyclic sequences could be divided into four types,which are L-M type, deep-water asymmetrical type, subtidal type and peritidal type. Clastic meter-scale cyclic sequences could be divided into two types, which are tidal-dynamictype and wave-dynamic type. The boundaries of meter-scale cyclic sequence are marked by instantaneous punctuated surface formed by non-deposition resulted from high-frequence sea-level changes, which include instantaneous exposed punctuated surface and drowned punatuated surface as well as their correlative surface. The development of instantaneous punctuated surface used as the boundary of meter-scale cyclic sequence lead to the limiting of Walthers Law that is used to explain facies distribution in time and space, and reaffirm the importance of Sander's Rule on analysis of stratigraphical records. These noncontinue surfaces could be traced in long distance and some be correlative in same basin range. The study on meter-scale cyclic sequences and their regularly vertical stacking patterns in long-term sequence indicate that the research on cyclicity of stratigraphic records is a useful way to get more regularity from stratigraphic records that are frequently complex as well as non-integratd.
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