Sedimentary facies and evolution of aeolianites on Shidao Island,Xisha Islands  

作　　者：赵强 吴时国 许红 孙启良 王彬 孙运宝 曹飞 贺晓苏 

机构地区：[1]Key Laboratory of Marine Geology and Environment,Institute of Oceanology,Chinese Academy of Sciences [2]Graduate University of Chinese Academy of Sciences [3]Key Laboratory of Marine Resources and Environmental Geology,Qingdao Institute of Marine Geology,Ministry of Land and Resources [4]Hangzhou Research Institute of Petroleum Geology,CNPC [5]China University of Geosciences

出　　处：《Chinese Journal of Oceanology and Limnology》2011年第2期398-413,共16页中国海洋湖沼学报（英文版）

基　　金：Supported by the National Basic Research Program of China (973 Program) (No. 2009CB219406);the Knowledge Innovation Program of CAS (KZCX2-YW-229);National Science & Technology Major Project (No. 2008zx05025-003-03)

摘　　要：The aeolianite deposits on Shidao Island of the Xisha Islands,the South China Sea,contain five stages of aeolian biocalcarenites and four paleosols.The aeolian biocalcarenites consist of two sedimentary facies:dune and interdune deposits.In the dunes,large-scale festoon cross-bedding,humped cross-bedding and high-angle foreset bedding are well developed,and in the interdunes,large-scale flat-bedding and low-angle wedge shaped cross-bedding are well developed.The sedimentary structures and lamella features indicate that the aeolian deposits are driven mainly by the northeast monsoon.The aeolian biocalcarenite and paleosols may reflect the arid and humid climates of the East Asian monsoon,respectively.By comparison with the stalagmite oxygen isotope climosequence of Hulu Cave,Nanjing,we inferred that the aeolianite formed in the last glacial stage,and the paleosols were formed during relatively long-term warm events.The aeolianite deposits on Shidao Island of the Xisha Islands, the South China Sea, contain five stages of aeolian biocalcarenites and four paleosols. The aeolian biocalcarenites consist of two sedimentary facies： dune and interdune deposits. In the dunes, large-scale festoon cross-bedding, humped cross-bedding and high-angle foreset bedding are well developed, and in the interdunes, large-scale flat-bedding and low-angle wedge shaped cross-bedding are well developed. The sedimentary structures and lamella features indicate that the aeolian deposits are driven mainly by the northeast monsoon. The aeolian biocalcarenite and paleosols may reflect the arid and humid climates of the East Asian monsoon, respectively. By comparison with the stalagmite oxygen isotope climosequence of Hulu Cave, Nanjing, we inferred that the aeolianite formed in the last glacial stage, and the paleosols were formed during relatively long-term warm events.

关 键 词：Shidao Island Xisha Islands AEOLIANITE PALEOSOL rhizolith East Asian monsoon 

分 类 号：P736.21[天文地球—海洋地质]