SequenceStratigraphic Framework for the Ediacaran in the Southeastern Part of Guizhou Province

Abstract

Abstract:

Ediacaran system in Guizhou Province is made up of the Doushantuo Formation and the Dengying Formation, in which the Doushantuo Formation is mainly composed of siliceous rock, and the Dengying Formation is mainly marked by micritic dolomite. On the basis of sequencestratigraphic division for some typical sections, sequencestratigraphic framework for the Ediacaran system in the southeastern part of Guizhou Province can be established. The stratigraphic succession from the Doushantuo Formation to the Dengying Formation constitute an upward shoaling sedimentary succession, and this succession make up one secondorder sequence that can be further divided into 5 thirdorder sequence. Importantly, the similarity of succession of sedimentary facies between the secondorder and thirdorder sequences reflects the basic feature, i.e. “cycle within cycle”. Furthermore, an important phenomenon that dolomites in shallow platform do not change into limestone in deepwater basin within the Dengying Formation reflects an important sedimentary feature, i.e. this set of dolomits may be resulted from primary precipitation that is same as the formation of “cap dolomite” in the bottom of the Doushantuo Formation and may represent the continuation of “the extreme greenhouse effect” in the Late Precambrian.

Key words: sequence stratigraphy, sequence stratigraphic framework, Ediacaran, southeastern part of Guizhou Province

CLC Number:

P534.31

ZHANG Hai, GAN Feng-Wei, WEI Ning. SequenceStratigraphic Framework for the Ediacaran in the Southeastern Part of Guizhou Province[J]. Geoscience, 2010, 24(2): 221-227.

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