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现代地质 ›› 2011, Vol. 25 ›› Issue (6): 1059-1065.

• 岩石学与地球化学 • 上一篇    下一篇

黔南坳陷上震旦统灯影组地球化学特征及沉积环境意义

 王鹏万1, 陈子炓1, 李娴静1, 程刚2, 贺训云1, 3, 4, 徐政语1, 马立桥1, 董庸1, 黄羚1   

  1. 1中国石油 杭州地质研究院, 浙江 杭州310023;2南方石油勘探开发有限责任公司,广东 广州510240;
    3中国科学院 地质与地球物理研究所,北京100029;4中国科学院 研究生院,北京100049
  • 收稿日期:2011-05-12 修回日期:2011-06-20 出版日期:2011-12-14 发布日期:2011-12-15
  • 作者简介:王鹏万,男,工程师,硕士,1981年出生,石油地质学专业,主要从事石油地质综合研究工作。 Email:wangpw_hz@petroChina.com.cn。
  • 基金资助:

    全国油气资源战略选区调查与评价项目(XQ-2007-01);中国石油科技部油气勘探新区、新领域综合性研究项目(2009A-0610)。

Geochemical Characteristics and Environmental Significance of Dengying Formation of Upper Sinian in Qiannan Depression

 WANG  Feng-Mo-1, CHEN  Zi-Liao-1, LI  Xian-Jing-1, CHENG  Gang-2, HE  Xun-Yun-1, 3 , 4 , XU  Zheng-Yu-1, MA  Li-Qiao-1, DONG  Yong-1, HUANG  Ling-1   

  1. 1Hangzhou Institute of Petroleum Geology, PetroChina Exploration and Development Research Institute, Hangzhou, Zhejiang310023,China;
    2 China Southern Petroleum Exploration and Development Corporation, Guangzhou,Guangdong510240,China; 3Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing100029,China; 4Graduate University of Chinese Academy of Sciences,Beijing100049,China
  • Received:2011-05-12 Revised:2011-06-20 Online:2011-12-14 Published:2011-12-15

摘要:

黔南坳陷上震旦统灯影组发育局限-开阔台地相白云岩。在麻江羊跳寨剖面灯影组碳酸盐岩样品测试分析基础上,利用常量元素和微量元素相关性、组分含量及特征元素比值特征,探讨了研究区元素地球化学特征与古沉积环境意义。结果表明:(1)CaO和MgO成明显正相关,SiO2与CaO、MgO呈负相关;Sr与MgO呈明显负相关,与Al2O3、K2O、Na2O、TiO2,P2O5,TFe存在正相关性;V,Al2O3,K2O ,TiO2,TFe ,P2O5之间呈正相关;Mn与TFe存在弱正相关性。(2)Sr含量和1 000×(Sr/Ca)值随沉积水体的加深而增大,可作为判断古水深和层序界面的标志。(3)根据Sr/Ba、镁铝比值(m=100×(MgO/Al2O3))、MgO/CaO及V/ (V+Ni)比值特征分析了灯影组沉积期的古盐度、古气候和古氧化还原环境。灯影组总体上形成于炎热干燥气候下的陆表海还原沉积环境,有陆源碎屑物质供应。其中灯影组二段沉积末古水深达到最大,灯影组五段古盐度最高。灯影组元素地球化学特征反映的沉积环境与岩性特征所得出的结论基本一致,表明元素地球化学特征与沉积环境关系密切,可作为沉积相分析的重要标志。

关键词: 黔南坳陷, 上震旦统, 灯影组,  , 地球化学特征, 沉积环境

Abstract:

The dolomite deposited in the Dengying Formation of Upper Sinian in the Qiannan Depression.Based on the actual measurement the Yangtiaozhai section, Majiang, we used the geochemical analyses to discuss the sedimentary geochemistry characteristics and the palaeosedimentary environment significance of Dengying FormationsThe results indicated:(1)CaO and MgO remarkably positively correlated with each other;SiOnegatively correlated with CaO and MgO; Sr negatively correlated with MgO, and positively correlated with Al2O3, K2O, Na2O, TiO2, P2O5, TFe; V, Al2O3, K2O, TiO2, TFe and P2O5 positively correlated with each other; Mn weakly positively correlated with TFe.  (2) The content of Sr and the value of 1,000×Sr/Ca increased with the depth of sedimentary water, regarded as the mark of the palaeobathymetric and succession boundary.  (3)The analytic results of the ratios of Sr/Ba, MgO/Al2O3, MgO/CaO and V/(V+Ni) revealed that the palaeosedimentary environments of Dengying Formation is ocean sediments which was formed in reducing environment of continental sea in hot arid climate,and with the detrital material of terrigenous origin Especially, the second member of Dengying Formation was formed in the deepest water environment and the paleosalinity of the fifth member of Dengying Formation is the highest;The geochemical characteristics and the sedimentary environment are closely correlated, and the geochemical characteristics can be regarded as an important mark in the sedimentary phase analyses

Key words:  Qiannan Depression, Upper Sinian, Dengying Formation, geochemical characteristic;sedimentary environment