Paleolake Evolution of Eocene in Fushun Basin
Paleolake Evolution of Eocene in Fushun Basin
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发表时间：
2010
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通讯作者：
Yang Dong
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作者：
Yang Dong
为了解释始新世-渐新世大陆对全球气候变冷的响应，通过野外实际地层剖面测量和室内样品测试，研究了东北中国地区始新世断陷盆地抚顺盆地的古湖泊特征。通过岩相、相标志和岩石薄片分析，揭示了抚顺盆地始新世沉积相的演化史。沉积亚相可分为湖泊和沼泽-浅湖-半深湖-深湖-半深湖-浅湖，水深由浅到深依次为：浅-深-浅。根据微量元素(B、Mn、Ti、Co、Co、B、Mn、Ti、Co、Co)的含量Ni、V)、元素含量比值(Sr/Ba、V/(V+Ni)、Ni/Co、ωFe_2O_3/ω-FeO)和氧化物比值，指出抚顺盆地在始新世早期-晚始新世气候突变，早始新世气候湿润，有利于珊瑚的形成；而在始新世中晚期，气候变得更加干燥，形成了咸水-半咸水泥灰岩与泥页岩的夹层。
In order to interpret continental responses to globally climatic cooling in the Eocene-Oligocene,we have studied the paleolake features of Fushun Basin,an Eocene fault-depression basin in NE China,through measuring actual strata profiles in the fields and indoor sample testing.The analysis of rock facies,facies indicators and rock thinsections suggests the evolution history of sedimentary facies in Eocene,Fushun Basin.Sedimentary subfacies vary as: lake and marshland-shallow lacustrine-half deep lacustrine-deep lacustrine-half deep lacustrine-shallow lacustrine,with the water depth varying as: shallow-deep-shallow.On the basis of contents of trace elements(B,Mn,Ti,Co,Cr,Ni,V),element contents ratios(Sr/Ba,V/(V + Ni),Ni/ Co,ωFe2O3 /ωFeO) and ratios of oxides,we point out that there was an abrupt climatic change from early Eocene to late Eocene in Fushun Basin.In the early Eocene,climate was moisture and good for coral forming.While,in the middle-late Eocene,climate changed into drier and made contribution into the interbedding between marlite forming in saline and half-saline water and clay shale.In general,our study shows that the climate changed from moisture to dry in Eocene-Oligocene.