Origin of fine-grained laminated carbonate rocks:A case study of the Lower Ordovician at Houtan section in Xishui County, Guizhou Province
Sun Yongchao1, Liu Jianbo1, 2
1 School of Earth and Space Sciences,Peking University,Beijing 100871; 2 Key Laboratory of Orogenic Belts and Crustal Evolution(Peking University),Ministry of Education,Beijing 100871;
Abstract：Lamination has been viewed as indicative of a low-energy environment,and commonly,relatively deep water.This viewpoint has undergone radical change after recent studies showed that lamination can also be deposited in a high-energy environment. On storm-influenced areas,mud can be transported in bedload as floc aggregate grains,deposition from these turbulent flows produces laminated mud current ripples. Abundant and diverse storm sedimentary structures were found in laminations at Houtan section in Xishui County of Guizhou Province,included storm-erosional structures and gutter casts.Based on the fine sedimentary research both in field and in laboratory,5 laminated types were identified:Thick parallel lamination, unidirectional cross-lamination, thin parallel lamination, thick wavy lamination and thick horizontal lamination. By EDS mapping,three elements of Al, Si and Mg were analyzed in light and dark lamination. These elements are uniformly distributed in light and dark lamination, with a bit more content in dark lamination due to the more clay minerals in it. Kelvin-Helmholtz shear instabilities have been invoked to explain the alternating light-dark lamination.Three types of storm deposit have been recognized. From type Ⅰ to type Ⅲ,storm influence decreased gradually.
Sun Yongchao,Liu Jianbo. Origin of fine-grained laminated carbonate rocks:A case study of the Lower Ordovician at Houtan section in Xishui County, Guizhou Province[J]. JOPC, 2016, 18(5): 743-758.
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