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Facies-succession and architecture of the third-order sequences and their stratigraphic framework of the Devonian in yunnan-guizhou-guangxi area,South China

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Journal of Palaeogeography 2013年第1期2卷 93-108页

作者： Mei Mingxiang Maurice E.Tucker School of Earth Science and Mineral Resources China University of Geosciences (Beijing) Department of Geological Sciences University of Durham

The Caledonian orogeny at the end of the Silurian resulted in great changes in the palaeogeography in the yunnan-guizhou-guangxi area of South China; the continental area of the Early Paleozoic evolved into the extensive Dian-Qian-Gui Sea in the Late Paleo-zoic. Early in the Devonian, as a result of a major transgression, seawater encroached gradually from the south to the north and clastic facies were deposited. Carbonate deposition was then established in the yunnan-guizhou-guangxi area, with a palaeogeography marked by attached platforms, isolated platforms and narrow basins. As a result of the Ziyun movement towards the end of the Devonian, the Upper Devonian strata are regressive and thin out from the open-sea to the land areas. A study of the nature and distribution of sedimentary facies in space and time recognises 13 third-order sequences in the Devonian strata in yunnan-guizhou-guangxi area, and these form two second-order sequences. The strata of the Lower Devonian comprise 5 third-order sequences (SQ1 to SQ5 ), which are dominated by transgressive clastics. 4 third-order sequences (SQ6 to SQ9 ) in the Middle Devonian are characterized by alternations of transgressive clastics and highstand carbonates. In the Upper Devonian, carbonates constitute 4 third-order sequences (SQ10 to SQ13 ), which are generally marked by the transgressive limestones and highstand dolomites. On the basis of earlier biostratigraphic studies, sea-level changes represented by the third-order sequences with their different facies successions are explored, and the sequence stratigraphic framework is established. There-fore, the Devonian strata in the study area provide an example for further understanding of depositional trends within the sequence-stratigraphic framework.

关键词： sequence stratigraphy Devonian yunnan-guizhou-guangxi area South China

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