中安纳托利亚火山省(CAVP)火成岩中的锆石颗粒形状参数及其成岩作用

IF 1.3 4区 地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY Turkish Journal of Earth Sciences Pub Date : 2023-09-29 DOI:10.55730/1300-0985.1872
LÜTFİYE AKIN
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引用次数: 0

摘要

锆石的形态参数反映了结晶过程中的物理化学条件,可以通过不同的工艺加以修饰。对中安纳托利亚火山省中新世-上新世火成岩中的锆石种群进行了研究,揭示了锆石外部形态与成岩作用的关系。描述性的颗粒形状参数(例如,小轴和长轴、面积、周长、纵横比、圆度和圆度)是通过名为AnalyZr的图形应用程序从锆石的透射光图像中自动测量出来的。主成分和聚类分析用于确定潜在的形状描述符(周长、主轴和小轴长度、最大和最小Feret),以表征特定岩石的颗粒。因此,火成岩锆石的形态变化可归因于特定的岩浆作用过程。前人研究的锆石同位素组成表明,火成岩来源于地幔,但由于地壳组分和周期性基性补给的不同贡献,其成因存在同位素不均匀性。此外,锆石的类型演化已经表明,即使饱和度和结晶温度的微小降低也会显著改变锆石的外部形态。CAVP火成岩锆石形态中明显的杂化印记可能提供了硅熔体中锆石发育的信息。该研究为整合锆石种群的形状和同位素变化数据提供了新的见解,这些数据可以追溯到岩浆对锆石晶体生长的控制。
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Zircon grain shape parameters from ignimbrites of the Central Anatolian Volcanic Province (CAVP) with implications for petrogenetic processes
Zircon morphology parameters reflect the physicochemical conditions during crystallization and can be modified by different processes. Zircon populations from Miocene-Pliocene ignimbrites of the Central Anatolian Volcanic Province (CAVP) were studied to reveal relations between the external morphology of zircons and petrogenetic processes. Descriptive grain shape parameters (e.g., minor and major axes, area, perimeter, aspect ratio, roundness, and circularity) were automatically measured from transmitted light images of zircons by a graphical application called AnalyZr. Principal component and cluster analysis were used to determine potential shape descriptors (perimeter, major and minor axis length, and maximum and minimum Feret) for characterizing grains from a particular rock. Accordingly, zircons from ignimbrites display morphological variations, which can be attributed to a specific magmatic process. Zircon isotopic compositions from previous studies indicate that ignimbrites are derived from mantle sources, but due to the distinct contributions of crustal components and periodic mafic recharge, isotopic heterogeneity occurs in the genesis of the ignimbrites. Furthermore, the typological evolution of zircons has already revealed that even a small decrease in saturation and crystallization temperature can significantly alter the external morphology of zircons. The clear imprint of hybridization in the zircon morphology of CAVP ignimbrites might provide information about the development of zircon within silicic melts. This study offers new insight into the integration of data on shape and isotope variations in zircon populations that can be traced back to the magmatic controls on zircon crystal growth.
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来源期刊
Turkish Journal of Earth Sciences
Turkish Journal of Earth Sciences 地学-地球科学综合
CiteScore
2.40
自引率
10.00%
发文量
6
审稿时长
6 months
期刊介绍: The Turkish Journal of Earth Sciences is published electronically 6 times a year by the Scientific and Technological Research Council of Turkey (TÜBİTAK). It is an international English-language journal for the publication of significant original recent research in a wide spectrum of topics in the earth sciences, such as geology, structural geology, tectonics, sedimentology, geochemistry, geochronology, paleontology, igneous and metamorphic petrology, mineralogy, biostratigraphy, geophysics, geomorphology, paleoecology and oceanography, and mineral deposits. Contribution is open to researchers of all nationalities.
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