Sedimentary Characteristics and Geological Significance of Laohutou Formation in Ruyuan Grand Canyon,Guangdong Province
In order to explore the sedimentary characteristics of the Devonian Laohutou Formation in Ruyuan Grand Canyon,Guangdong Province,the typical section of Youxi forest farm in the area was selected.Based on field investigation,thin section identification,grain size analysis and sedimentary facies markers,the Laohutou Formation in the Ruyuan Grand Canyon area is considered to be a set of braided river-tide-controlled delta-tide-flat facies deposits,and a set of transgression sedimentary sequence with coarse bottom and fine top.The river deposits are three microfacies from bottom to top:bed retention phase,diara and natural embankment.Tidal deltas are mainly delta front deposits,which can identify underwater distributary channels,interdistributary bays and estuarine sand bars.Two subphases of tidal flat deposit can be identified:subtidal zone and intertidal zone,sand flat and tidal channel cycle,mixed flat and tidal channel cycle,the upper part of which is mud flat.This study establishes a complete sedimentary model for the transition from continental to Marine facies,and provides theoretical support for the study of Devonian sedimentary facies and lithofacies paleogeography in Ruyuan area.
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