Typical storm deposits are developed in the limestones of the Daye Formation of Lower Triassic in Huangshi area, eastern Hubei Province. The tempestites include gravelsized intraclastic limestone, grain limestone and marl. The sedimentary structures of storm deposits include hummocky crossbedding, graded bedding, tearing structures and horizontal bedding. Besides, the types and assemblage features of storm deposit sedimentary structures are different at different stratigraphic intervals. Based on the lithologic characteristics, types of sedimentary structures, sizes and assemblage features of storm deposits, combined with analysis of sedimentary background, the sedimentary succession of the Daye Formation storm deposits can be subdivided into 3 types: deepwater distal sequence, transitional sequence, and shallowwater proximal sequence. The Member 1 of Daye Formation is characterized by a deepwater distal sequence, which was mainly deposited in the deep water outer shelf. The Member 2 is dominated by a transitional sequence, which was deposited in the inner shelf. The Members 3 and 4 are characterized by a shallowwater proximal sequence, which was mainly deposited in the shallow water shelf to littoral environment. The Daye Formation comprises an upward shoaling succession, and its sedimentary environment changes from the outer shelf to the littoral facies. The recognition of the storm deposits in Daye Formation is important for reconstructing the Early Triassic palaeogeography in Huangshi area of eastern Hubei Province.
About author: Yang Baozhong,born in 1969, is a lecturer and a candidate for doctoral degree at China University of Geosciences,Wuhan. He is mainly engaged in sedimentology and stratigraphy. Email:Bzyang@cug.edu.cn, Tel:027-65057643.
Cite this article:
. Storm deposits of the Daye Formation of Lower Triassic in Huangshi area of eastern Hubei Province[J]. JOURNAL OF PALAEOGEOGRAPHY, 2007, 9(4): 379-386.
. Storm deposits of the Daye Formation of Lower Triassic in Huangshi area of eastern Hubei Province[J]. JOPC, 2007, 9(4): 379-386.