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鄂尔多斯盆地南缘中奥陶统火山凝灰岩的研究与意义
石油实验地质
1995年 17卷 第2期
阅读：106
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Title
RESEARCH AND SIGNIFICANCE OF VOLCANIC TUFF FROM MID-ORDOVICIAN SERIES IN THE SOUTHERN MARGIN OF THE ORDOS BASIN
单位
地矿部华北石油地质局第三普查勘探大队, 咸阳, 712000
Organization
№.3 General Sutvey and Exploration Party, North Chia North China Bureau of Petileum Geology, MGMR
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。
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.
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;
DOI
https://doi.org/10.11781/sysydz199502167
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