天然气地球科学 ›› 2005, Vol. 16 ›› Issue (1): 54–58.doi: 10.11764/j.issn.1672-1926.2005.01.54

• 天然气地球化学 • 上一篇    下一篇

吉辽地区震旦系碳酸盐岩地球化学特征及其环境意义

旷红伟1,刘燕学2,孟祥化3,葛铭3   

  1. (1.长江大学油气资源与 勘探技术教育部重点实验室,湖北 荆州 434023; 2.长江大学地球物理与石油资源学院 ,湖北 荆州 434023;3.中国地质大学沉积盆地研究所,北京 100083)
  • 收稿日期:2004-10-23 修回日期:2004-12-08 出版日期:2005-02-20 发布日期:2005-02-20
  • 通讯作者: 旷红伟kuanghw@126.com. E-mail:kuanghw@126.com.
  • 作者简介:旷红伟(1969-),女,湖南湘乡人,副教授,博士,从事储层沉积学和层序地层学的教学和研究工作.
  • 基金资助:

    国际地质对比计划项目IGCP447(编号:SC/GEO/546/447),国家自然科学基金项目(编号:40172043)资助.

THE GEOCHEMICAL FEATURES AND ITS ENVIRONMENTAL SIGNIFICANCE OF THE SINIAN CARBONATES IN THE JILIN-LIAONING AREA

KUANG Hong-wei1, LIU Yan-xue2, MENG Xiang-hua3, GE Ming3   

  1. (1.Key Laboratory of Exploration Technologies for Oil and Gas Resources, Minis try of Education, Yangtze University,  Jingzhou 434023, China; 2. Institute of G eophysics and Oil Resources, Yangtze University, Jingzhou 434023, China;  3.Inst itute of Sedimentary Basin of China University of Geosciences,  Beijing 100083, China)  
  • Received:2004-10-23 Revised:2004-12-08 Online:2005-02-20 Published:2005-02-20

摘要:

对采自吉辽地区5个发育臼齿碳酸盐岩的震旦系地层剖面的样品进行了荧光光谱分析,这些样品涵盖了研究区发育的9种岩性及4种沉积微相类型,较全面地反映了该区新元古代碳酸盐岩地层的地球化学特征及其所蕴含的环境意义。在对样品的测试结果进行分析的基础上,系统论述了碳酸盐岩中各氧化物含量之间的相关关系,即:SiO2、Al2O3、P2O5与K2O、TFe2O3、TiO2呈明显的正相关而与CaO呈明显的负相关;Na2O与MgO弱正相关,与Sr、Ba呈不明显的正相关,与Ca呈负相关;Sr、Ba与Al2O3、P2O5、K2O、TiO2呈正相关关系,Ba与FeO呈正相关;MnO仅与FeO有正相关关系。分析了各元素与沉积环境的关系,特别解释了由潮间带到深缓坡,陆源组分(如K2O)的含量增高、Ca/Mg值降低和Sr含量(Sr/Ca)增加等异常现象,反映了研究区碳酸盐岩特殊的地化特征。

关键词: 吉辽地区, 震旦系, 碳酸盐岩, 臼齿, 地球化学特征, 沉积环境

Abstract:

 This paper analyzed samples selected from 5 sinian sections developed Molar Toot h carbonates by fluorescent spectroscopic analysis in the Ji-Liao area. These s amples contain 9 kinds lithology and 4 types of Micro-facies developed in the s tudied area and reflected roundly the geochemical features of carbonates and the ir environment significance. Based on the correlation analysis for the testing r esult, systemically discusses the correlativity between oxides of Carbonates, th at is, SiO2, Al2O3and P2O5 is positive correlativ ity with K2O, TFe2O3and TiO2, but is negative with Ca;  Na2O is lightly and positively correlated with MgO, Sr and Ba and negative ly correlated with Ca too; Sr and Ba behave positive correlativity with Al2O3, P2O5, K2O, TiO2, moreover,Ba is positively s orrelated with FeO, while Mn is positively correlated with FeO only. The paper a nalyzed the relationship between the contents of oxides and sedimentary environm ent, especially make clear some phenomenon, such as contents of the terrigenous  components (for example, K2O) increase, the values of Ca/Mg decline and the content of Sr or the ratio of Sr/Ca adds from the intertidal zone to the deepe r ramp, which indicates the special geochemical environment. 

Key words: The Ji-Liao area, The sinian system, Carbonates, Molar tooth, Geochemistry, Sedimentary environment.

中图分类号: 

  • TE122.1+13

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