A Petrological Study of Columnar Joints with Geoheritage Value in the Cenozoic Sedimentary Basin, Korea

IF 0.6 0 ART

International Journal of Conservation Science Pub Date : 2022-12-31 DOI:10.12654/jcs.2022.38.6.10

Jae hwan Kim, Dal-Yong Kong

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引用次数: 0

Abstract

A comparative petrological study was conducted on the columnar joints of Guryongpo, Pohang, Yangnam, Gyeongju, and Gangdong-hwaam, Ulsan in the Cenozoic Miocene sedimentary basin. Horizontal columnar joints, in these columnar joints, are characteristically developed, and the cross-sectional shape of each columnar joint is predominantly quadrilateral and pentagonal in Guryongpo and Yangnam columnar joints, and pentagonal to hexagonal in Gangdong-hwaam columnar joint. As a result of XRF analysis, it was confirmed that Guryongpo columnar joint is andesite, Yangnam columnar joint is basalt, and Gangdong-hwaam columnar joint is basaltic andesite, all of which are sub-alkaline. They are easily distinguished because Guryongpo columnar joint contains small-sized plagioclase (1∼2 mm), while rather large plagioclase phenocrysts (several mm∼1 cm) are uniformly distributed both in Yangnam and Gangdong-hwaam columnar joints. The value of whole rock magnetic susceptibility (WRMS) are also well classified according to the rock composition. In addition, in the tectonic discriminant diagram, these columnar joints correspond to the orogeny zone and island-arc tholeiite regions of the orogeny, but the AFM diagram and WRMS analysis show that each columnar joint was formed from the different magmas.

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韩国新生代沉积盆地具有地质遗产价值的柱状节理岩石学研究

对新生代-中新世沉积盆地中庆州浦项-杨南-古龙坡和蔚山-江东-华岩的柱状节理进行了对比岩石学研究。在这些柱状节理中，水平柱状节理发育，各柱状节理的断面形状以四边形和五角形为主，江东-华岩柱状节理以五角形至六角形为主。通过XRF分析，确定古龙坡柱状节理为安山岩，杨南柱状节理为玄武岩，江东花岩柱状节理为玄武岩安山岩，均为亚碱性。九龙浦柱状节理中含有较小的斜长石(1 ~ 2mm)，而在阳南和江东-华岩柱状节理中均匀分布着较大的斜长石斑晶(数mm ~ 1cm)，因此很容易区分。岩石整体磁化率(WRMS)值也可根据岩石组成进行分类。此外，在构造判别图中，这些柱状节理对应于造山带和岛弧拉斑区，但AFM图和WRMS分析表明，每个柱状节理由不同的岩浆形成。

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来源期刊

International Journal of Conservation Science ART-

CiteScore

1.70

自引率

37.50%

发文量

审稿时长

10 weeks

期刊介绍： The International Journal of Conservation Science (IJCS) is a high quality peer-reviewed journal devoted to the publication of original research papers in applied conservation science and its broad range of applications. IJCS it is an open access journal. All content is freely available without charge to any user or his/her institution. Users are allowed to read, download, copy, distribute, print, search, or link to the full texts of the articles in this journal without asking prior permission from the publisher or the author. The topics cover all disciplines and branches of modern scientific conservation, including different aspects on general conservation theory, scientific investigation of works of art, authentication, determination of conservation state, compatibility studies for preservation and restoration procedures and monitoring of interventions effectiveness, etiopathology of historic and natural monuments, studies on the mechanisms of deterioration and degradation for different materials as structural and ornamental elements, impact of the environmental factors or agents on monuments and ecosystems, obtaining and characterization of new materials and procedures for preservation and restoration, new methodologies for scientific investigation, cross-related problems concerning research applied to conservation science, biodiversity conservation. Review articles in selected areas are published from time to time.