锆石积分圆度指数的估算方法:克里米亚山脉西梅雷德沉积层序案例研究

IF 0.7 4区 地球科学 Q4 GEOCHEMISTRY & GEOPHYSICS Lithology and Mineral Resources Pub Date : 2024-05-09 DOI:10.1134/S0024490224700524
T. V. Romanyuk, P. D. Kotler
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摘要

摘要 介绍了一种根据晶体顶点、边缘和面的保存情况,按 5 分制评估碎屑锆石圆度的技术。根据对单个晶粒的测量结果,计算出来自不同地层单元的锆石晶粒集的整体圆度指数 Rs。所获得的数据可以确定不同类别晶粒在不同序列中的比例,并评估它们的相似/差异程度,这可以作为区分沉积剖面的额外标准。所提出的方法被用于比较克里米亚山脉一些锡梅里德沉积序列中的碎屑锆石的圆度特征。结果表明,与飞沙序列中的同类锆石相比,陈卡序列的砂岩具有较高比例的非圆形和弱圆形锆石以及几乎不存在完全圆形颗粒的特点。锆石晶粒组的 Rs 值从金牛座组的 3.41 和 3.95 到陈卡序列的 2.55 不等。因此,序列中的 Rs 值具有显著差异,这一点也通过使用 Kolmogorov-Smirnov 检验法计算的互对系数 p 值得到了证实。
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Method of Estimating the Integral Roundness Index for Detrital Zircons: A Case Study of Cimmeride Sedimentary Sequences in the Crimean Mountains

A technique to evaluate the degree of roundness of detrital zircons on a 5-point scale based on the preservation of crystal vertices, edges, and faces is presented. Based on measurements in individual grains, the integral roundness index Rs is calculated for a zircon grain set from various stratigraphic units. The obtained data make it possible to determine the proportion of different class grains in various sequences and to assess their similarity/difference degree, which can serve as an additional criterion for the differentiation of sedimentary sections. The proposed method is used to compare the roundness characteristics of detrital zircons from some Cimmeride sedimentary sequences in the Crimean Mountains. It is shown that relative to counterparts in the flysch sequences, sandstones of the Chenka sequence are characterized by a higher proportion of unrounded and weakly rounded zircons and a virtual absence of completely rounded grains. Value of Rs for the zircon grain set ranges from 3.41 and 3.95 for the Tauric Group to 2.55 for the Chenka sequence. Thus, Rs values in the sequences are marked by a significant difference, which is also confirmed by values of the mutual pair coefficient p calculated using the Kolmogorov–Smirnov test.

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来源期刊
Lithology and Mineral Resources
Lithology and Mineral Resources 地学-地球化学与地球物理
CiteScore
1.30
自引率
37.50%
发文量
29
审稿时长
>12 weeks
期刊介绍: Lithology and Mineral Resources is an international peer reviewed journal that publishes articles on a wide range of problems related to the formation of sedimentary rocks and ores. Special attention is given to comparison of ancient sedimentary rock and ore formation with present-day processes. The major part of the journal is devoted to comparative analysis of sedimentary processes on the continents and in oceans, as well as the genetic aspects of the formation of sedimentary and hydrothermal–sedimentary mineral resources. The journal welcomes manuscripts from all countries in the English or Russian language.
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