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砂屑岩的综合结构系数与沉积环境分析
Comprehensive Textural Coefficient of Arenaceous Rocks and Analysis of Sedimentary Environments
  
中文关键词:砂屑岩 结构系数 沉积环境分析
英文关键词:comprehensive textural coefficient,arenaceous rocks,analysis of sedimentary environments,
基金项目:
宋天锐
中国地质科学院地质研究所 北京
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中文摘要:
      本文讨论了砂屑岩综合结构系数与沉积环境分析的实例。 这里介绍的测定砂屑岩结构成熟度的方法是在显微薄片粒度分析基础上提出的,其中包括了成熟度、分选性、颗粒圆度和岩石的杂基等多种因素。综合结构系数可按下式求得: T=(SoΦPo)/(PΦC) 因为圆度是在显微镜下的薄片中求得,因而总是比实际投影的易反映其棱角而降低了圆度,所以采用了[p02 (R-A)2]0-5来校正颗粒的圆度,于是得出了发展的综合结构系数Td:Td=SoΦ[P02 (R-A)2]0.5/(PΦC)多数情况下Td和T很接近,只是颗粒圆度非常好时才拉大差距,因此,Td可用来检验超成熟度的砂岩。 本文提出了四种成熟度阶段:不成熟的(T<10);次成熟的(T=10-40);成熟的(T=40-100);超成熟的(T或Td>100)。
英文摘要:
       The comprehensive textural coefficient of arenaceous rocks can be used for analysis of sedimentary environments. A formula for defining the textural maturity of arenaceous rocks is put forward based on microscopic grain-size analysis in thin sections. The aim that we proposed this iormnla is to establish a numerical relationship between sorting and roundness of gains as well as matrix content and maturity of rocks. "hhe comprehensiva textural coefficient can be obtained according to the following formula: T=(SoΦPo)/(PΦC) Since the roundness of a grain is determined under a petrographic micro- scone, it is always smaller in thin section. The projecting of a grain often reflects its angular Goners and grain roundness is corrected by (Po2+(R-A)2)0.5 The developed comprehensive textural coefficient Td is thus Td=SoΦ[P02 (R-A)2]0.5/(PΦC) In most cases Td is similar to T. When grains are very well rounded, Td is more useful for checking the superm ature sandstone. Four maturity stages are divided, i. e. immature(T<10),submature (T= 10-40),mature (T=40-100),and supermature (T or Td>100). The usage of the comprehensive textural coefficient is illustrated by some examples in this paper.
宋天锐,1991,砂屑岩的综合结构系数与沉积环境分析[J].岩石矿物学杂志,10(3):210~220.
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