RESEARCH AND SIGNIFICANCE OF VOLCANIC TUFF FROM MID-ORDOVICIAN SERIES IN THE SOUTHERN MARGIN OF THE ORDOS BASIN
-
摘要: 笔者通过鄂尔多斯盆地南缘地区中奥陶统火山凝灰岩的岩石化学特征研究,认为该区的火山凝灰岩分属钙碱质系列和拉斑玄武岩系列,并根据δ-τ指数图解及其他判别指标,确定火山凝灰岩为岛弧喷发产物,这为进一步分析中奥陶世构造环境提供了依据。
-
关键词:
- 鄂尔多斯盆地南缘地区 /
- 火山凝灰岩 /
- 岩石化学特征 /
- 岛弧喷发产物
Abstract: On the basis of the research of the petrochemical characteristics of volcanic tuff from Mid-Ordovician series in the southern margin area of the Ordos Basin,the author considers that the volcanic tuff of this area belongs to calc-alkaline rock series and tholeiite series respectively.According to δ-τ index diagrams and other judgement indexes,the author also believes that volcaiiic tuff is an island arc eruption product.This provides evidences forthe further analvsis of tectonic environments in Middle Ordovician epoch. -
[1] 久野久(日),刘德泉等译校.火山及火山岩.北京:地质出版社,1978. [2] 武汉地质学院岩石教研室.岩浆岩岩石学.北京:地质出版社,1980. [3] 王德滋等.火山岩岩石学.北京:科学出版社,1982. [4] 丛柏林.岩浆活动与火成岩组合.北京:地质出版社,1979. [5] 张国伟等.秦岭造山带的形成及其演化.西安:西北大学出版社,1988. [6] 叶连俊等.秦岭造山带学术讨论会论文选集.西安:西北大学出版社,1991. [7] 安三元等.北秦岭裂隙的形成与变质作用.西安:西北大学出版社,1992 -
计量
- 文章访问数: 696
- HTML全文浏览量: 61
- PDF下载量: 451
- 被引次数: 0