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A simple, effective petrographic method for quantifying percent clay or other grain-coat coverage in sandstones
Journal of Sedimentary Research ( IF 2 ) Pub Date : 2021-02-28 , DOI: 10.2110/jsr.2020.135
Stephen G. Franks 1 , John Pantano 2
Affiliation  

A simple petrographic method is presented to quantify the percent of grain-coat coverage in sandstones. The method involves visually noting whether, at the intersection of a grain boundary and an ocular crosshair, a grain coat (or other grain coating) is present or absent. If a coating is absent at the juncture of the grain boundary and the ocular crosshair, then it can be recorded whether an open pore, a pore-filling cement, or another grain is present at that point. The technique is simple to apply as part of standard point-counting procedures for composition or for grain size. It is much less time consuming, minutes rather than hours, than methods that involve measuring grain perimeters and grain-coat length on SEM images or on thin sections. Computer simulations and comparative measurements on sets of the same samples suggest that they yield results comparable to those techniques. It is less subjective than visual estimates of grain-coat coverage and gives more reproducible results. The mineralogy of the grain coat, its thickness, and its paragenetic relationships to other grain-coating phases can be simultaneously recorded.

中文翻译:

一种简单,有效的岩相学方法,用于量化砂岩中粘土或其他颗粒被覆层的百分比

提出了一种简单的岩相学方法来量化砂岩中颗粒被覆层的百分比。该方法包括视觉上观察在晶界和眼十字准线的相交处是否存在或不存在晶粒涂层(或其他晶粒涂层)。如果在晶界和眼十字线的交界处不存在涂层,则可以记录在该点上是否存在开孔,填充孔的胶结物或其他晶粒。该技术很容易作为组成成分或晶粒尺寸的标准点算程序的一部分来应用。与在SEM图像或薄切片上测量晶粒周长和晶粒涂层长度的方法相比,它的耗时要少得多,而不是数小时,而不是数小时。对一组相同样品的计算机模拟和比较测量表明,它们产生的结果可与那些技术相媲美。它不像目测估计的谷物涂层覆盖率那样主观,可以提供更可重复的结果。可以同时记录颗粒涂层的矿物学,其厚度以及与其他颗粒涂层相的共生关系。
更新日期:2021-03-26
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