Characteristics and its palaeoenvironmental significance of the Middle-Upper Cambrian dolostones of Gudongkou section at Xingshan, Hubei Province
Yuan Xinpeng1,2 Liu Jianbo1，3，4
1 School of Earth and Space Sciences，Peking University，Beijing 100871 2 SINOPEC International Petroleum Exploration & Production Corporation, Beijing 100029 3 Key Laboratory of Orogenic Belts and Crustal Evolution（Peking University），Ministry of Education，Beijing 100871 4 State Key Laboratory of Palaeobiology and Stratigraphy，Nanjing Institute of Geology and Palaeontology，Chinese Academy of Sciences，Nanjing 210008， Jiangsu
Abstract The dolostone was extensively deposited in the Middle-Upper Cambrian of the Upper Yangtze Platform，South China.It was formed in particular palaeoclimatic and palaeooceanographical environment，however，there still exist debates about its sedimentary environment and genesis.In this paper，based on the fine sedimentary research both in field and in laboratory，8 lithofacies types and 3 sedimentary cycles were identified，with the majority of the carbonates deposited in the subtidal zone or in the shaly basin of shallow marine carbonate platform，in the Middle-Upper Cambrian Qinjiamiao Group and Sanyoudong Group at Gudongkou section in Xingshan，Hubei Province.By overlapping sedimentary cycles and computing Fischer plots，the history of accommodation change of the Upper Yangtze Platform during Middle-Late Cambrian was analyzed，and 18 fourth-and 7 third-order cycles，which have preliminarily made up the curve of high-frequency relative sea-level change was identified.The temporal-spatial distribution of sedimentary facies in the Upper Yangtze Platform suggests that the relative sea-level of the platform was gradually dropping from Middle Cambrian to Late Cambrian，resulting in the sedimentary environment changing from shaly basin(or deep subtidal)to shallow subtidal，and the sedimentary facies changing from relatively-deep-water mixed deposition of terrigenous debris and carbonate sediments to relatively-shallow-water carbonate deposition.The sedimentary characteristics in the Upper Yangtze Platform during Middle-Late Cambrian are consistent with the global change，indicating the unique global “super-greenhouse” palaeoclimate and internal-platform relatively-high-salinity palaeoceanography.
Corresponding Authors:
About the corresponding author:Liu Jianbo，born in 1966，is engaged in palaeontology，sedimentology，and palaeoenvironment changes.E-mail:jbliu@pku.edu.cn.
About author: Yuan Xinpeng，born in 1985，is a Ph.D.candidate of palaeontology and stratigraphy.E-mail: yuanxinpeng2011@hotmail.com.
Cite this article:
Yuan Xinpeng,Liu Jianbo. Characteristics and its palaeoenvironmental significance of the Middle-Upper Cambrian dolostones of Gudongkou section at Xingshan, Hubei Province[J]. JOURNAL OF PALAEOGEOGRAPHY, 2013, 15(3): 363-382.
Yuan Xinpeng,Liu Jianbo. Characteristics and its palaeoenvironmental significance of the Middle-Upper Cambrian dolostones of Gudongkou section at Xingshan, Hubei Province[J]. JOPC, 2013, 15(3): 363-382.
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