在日本南阿尔卑斯的志佐加达克山的方尖碑状花岗岩塔:三维形态研究

IF 1 4区 地球科学 Q4 GEOSCIENCES, MULTIDISCIPLINARY
Island Arc Pub Date : 2022-06-10 DOI:10.1111/iar.12449
Masahiro Chigira
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引用次数: 1

摘要

出露的花岗岩类岩体中存在发育良好的岩石和伴生的砾石田,但其地貌成因尚未完全查明。虽然这种类托尔特征通常归因于正交节理系统,风化作用沿着该系统进行,并去除风化物质,但以往的研究大多缺乏三维(3-D)形态观察。日本著名的花岗岩石塔之一,即日本南阿尔卑斯山脉的Jizogadake山的方尖碑,使用无人驾驶飞行器(uav)进行了调查。对花岗岩方尖碑的三维观察发现,它是由柱状节理形成的,沿长轴起伏,横截面不规则。由于这些特征和石柱与暴露表面之间的交点角度,方尖碑呈现出一种特殊的形态,当从地面观察时,看起来像一堆岩石块。柱状节理可能发生在花岗岩类岩体的边缘地带,因为冷却速度较快。三维观测也证实柱状节理的形成早于高角度平面节理。柱状节理将岩体划分为平面节理。这可能意味着大角度节理可能是在构造和热应力作用下的冷却过程中形成的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
An obelisk-shaped granitoid tower at Mt. Jizogadake in the Southern Alps of Japan: A 3-D morphological study

Well-developed tors and associated boulder fields are present in exposed granitoid pluton, but their geomorphological origins have not been fully addressed. Although the tor-like features are commonly attributed to the orthogonal joint system along which weathering proceeds and the weathering materials are removed, the majority of previous studies lack three-dimensional (3-D) morphological observations. One of the well-known granitoid rock towers in Japan, namely, the obelisk at Mt. Jizogadake in the Japanese Southern Alps, was investigated using unmanned air vehicles (UAVs). A 3-D observation of the granitoid obelisk found that it is shaped by columnar joints with an undulation along a long axis and irregularly shaped cross-sections. Because of these features and intersection angles between the rock columns and exposure surfaces, the obelisk exhibits a peculiar morphology appearing as a heap of rock blocks when observed from the ground. The columnar jointing might have occurred in a marginal zone of the granitoid pluton due to faster cooling rates. The 3-D observations also confirmed the columnar joints formation was predated by high-angle, planar joints. The columnar joints divide the rock mass between those planar joints. This may imply that the high-angle joints would have formed probably during cooling under the presence of tectonic and thermal stresses.

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来源期刊
Island Arc
Island Arc 地学-地球科学综合
CiteScore
2.90
自引率
26.70%
发文量
32
审稿时长
>12 weeks
期刊介绍: Island Arc is the official journal of the Geological Society of Japan. This journal focuses on the structure, dynamics and evolution of convergent plate boundaries, including trenches, volcanic arcs, subducting plates, and both accretionary and collisional orogens in modern and ancient settings. The Journal also opens to other key geological processes and features of broad interest such as oceanic basins, mid-ocean ridges, hot spots, continental cratons, and their surfaces and roots. Papers that discuss the interaction between solid earth, atmosphere, and bodies of water are also welcome. Articles of immediate importance to other researchers, either by virtue of their new data, results or ideas are given priority publication. Island Arc publishes peer-reviewed articles and reviews. Original scientific articles, of a maximum length of 15 printed pages, are published promptly with a standard publication time from submission of 3 months. All articles are peer reviewed by at least two research experts in the field of the submitted paper.
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