Trace Element and Palaeoenvironmental Analyses of the Cenozoic Lacustrine Deposits in the Upper Es4 Submember of the Dongying Basin
详细信息
- 责任者：Zhang Bin (Geological Scientific Research Institute ; Shengli Oilfield Branch Company ; SINOPEC ; Dongying 257015 ; China) ; Yao Yimin
- 刊名：Journal of Stratigraphy
- 出版年：2013
- 卷期：37(2)
- 关键词：沙河街组 ; Shahejie Formation ; 元素地层学 ; element stratigraphy ; 古环境 ; paleoenvironment ; 东营凹陷 ; Dongying Sag ; ICP ; inductively coupled plasma ; 微量元素 ; minor elements ; 元素比值 ; element ratios ; 古近纪 ; Paleogene ; 山东 ; Shandong Province
- 页码：p.186-192
- 图表：illus., 3 tables, 13 refs.
- 分类号：1200
- issnNo：ISSN0253-4959
- isbnNo：CN32-1187/P
摘要
Trace element concentrations of the upper Es4 submember of the Dongying Basin were analyzed by ICP-AES in order to facilitate palaeoenvironmental reconstruction. The trace elements Fe and Mn show different geochemical behaviors. Therefore, Fe/Mn ratio of about 0.7×102 can be used a cutoff geochemical proxy to differentiate nearshore from deep lacustrine facies. The Ca/Mg ratio is also useful in paleoenvironmental reconstructions: Ca/Mg ratios of <5 are typical of fluvial or nearshore facies; Ca/Mg ratios of 5～10 (up to 20) are characteristic of deep lacustrine facies at the southern slope in the Dongying Basin. The Sr/Ba ratios respond to salinity and lake restriction. Sr/Ba ratios < 1 are indicative of nearshore environment and influence of riverine input, Sr/Ba ratios of 1～4 are typical of lacustrine facies, and Sr/Ba ratios of 4～8 represent restricted saltwater lacustrine facies.
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