Acta Scientiarum Naturalium Universitatis Pekinensis

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The Geochemical Characteristics of Hydrothermal Sediment for the Bedded Silicilith in the Meso Proterozoic Era and Their Sedimentary Environment Importance in Pingyin, Shandong Province

XU Yuetong1, ZHOU Baohua1, HUANG Fusheng2   

  1. 1Department of Geography, Shandong Teacher's University, Jinan, 250014; Department of Geology, Peking University, Beijing, 100871
  • Received:1996-08-26 Online:1997-03-20 Published:1997-03-20


徐跃通1, 周保华1, 黄福生2   

  1. 1山东师范大学地理学系,济南,250014; 2北京大学地质学系,北京,100871

Abstract: There are bedded siliciliths which are conformity with the Mesoproterozoic Erathem stratum in Pingyin Area, Shandong Province. The siliciliths can be identified as hydrothermal sediment ones by the higher contents of Fe, Mn, As, Sb, Bi, Ga, and comparatively lower Al; lower total REE, negative Ce anomaly and comparatively enrichment in HREE, the δ30Si values range from -0.01% to 0.04%, the δ30O values range from 1.36% to 2.01%. The siliciliths all belong to hydrothermal sediment ones in Al-Fe-Mn and Fe-Mn-(Ni+Co+Cu) triangle diagrams. And the values of MnO/TiO2 ratioes, δCe and δ30Si in these siliciliths manifest that the siliciliths are deposited in the deep-sea environment.

Key words: Silicilith, geochemistry, hydrothermal sediment, sedimentary environment

摘要: 在山东平阴地区中元古界地层中存在与地层整合产出的层状硅质岩。硅质岩富Fe、Mn,相对贫Al; 富集As、Sb、Bi、Ga; REE总量低,Ce负异常,HREE相对富集;(δ30Si变化范围为-0.1‰~0.4‰,δ18O变化范围为+13.6‰~+20.1‰,具有热水沉积硅质岩的地球化学特征。在Al-Fe-Mn和Fe-Mn-(Ni+Co+Cu)三角图上均属热水沉积硅质岩。硅质岩MnO/TiO2比值、δCe值和δ30Si值分析表明本区层状硅质岩主要是在深海环境下沉积的。

关键词: 硅质岩, 地球化学, 热水沉积, 沉积环境

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