APP下载

广东省亚髻山地质遗迹特征及成因分析

2018-07-17郭宇苏扣林陈峰

国土资源导刊 2018年2期

郭宇 苏扣林 陈峰

文章编号:1672-5603(2018)02-067-4

摘 要 亚髻山地质遗迹点位于广州市从化区良口镇石岭村和佛冈县四九芒寨村一带,球状风化体主要分布在山腰和山顶坡度转折较大的地方,最大的球形风化体直径可达4-5m;球状风化体的形成主要受控于自身岩性特征、所处构造环境以及当地气候条件,物理化学、生物风化等作用沿岩石节理方向渗透,使得岩体顶部最先遭受侵蚀,经过地质作用的改造进而形成形态各异的“石蛋”;亚髻山地质遗迹点的球状风化“石蛋”具有很强的科学与美学价值,是珍贵的地质遗产,建议加以宣传并保护,建立地质公园对其合理开发利用,将地质资源与旅游规划结合起来,为当地创收提供新思路。

关键词 亚髻山;地质遗迹;特征;成因分析

中图分类号:P66 文献标识码:A

The Analysis of Characteristics and Genesis of Yajishan Geological Heritage, Guangdong Province

Guo Yu, Su Koulin, Chen Feng

(Guangzhou Geological Survey Institute, Guangzhou Guangdong 510440)

Abstract: The Yajishan geological heritage is located around Shiling Village, Guangzhou, and Sijiumang Village, Fogang, where the spherical weathered bodies are mainly distributed in the places of the slope of the mountainside and the top of the mountain. The largest spherical weathered body diameter up to 4-5m. The formation of spherical weathering bodies was mainly controlled by lithological characteristics, the tectonic environment and the local climate conditions. The top of the rock was eroded firstly along the direction of rock joints by the effect of physical chemistry and bio-weathering. Geological transformation make the rock into different shapes of "stone egg", a precious geological heritage with scientific and aesthetic value, proposed to promote and protect, and geo-park should be established under rational development and utilization, which is a combination of geological resources and tourism planning, to provide new ideas for local income.

Keywords: Yajishan; geological heritage; characteristics; genesis

0 引言

花崗岩在形成演变过程中,受内部构造应力和外部风化作用等影响节理裂隙发育,尤其是花岗岩接近地表或暴露时,岩石表面突出的棱角逐渐被磨平磨圆,形成了近似于球状的风化体,这种岩石地质演化可以称之为花岗岩的球状风化[1]。这种球形风化体俗称花岗岩“孤石”,其形状各异,大小不同,可以在地球表面裸露,也可以位于地表以下,有时由于受到地表搬运的影响而堆积起来成为孤石堆,还有些很小块度与其他类型花岗岩共生成为“石蛋群”[2-3]。2010年,广东省亚髻山被广东省国土资源厅列为典型岩石类地质遗迹,该地质遗迹点位于广东省广州市从化区良口石岭村和佛冈县四九芒寨村一带,面积约7.45 km2。……

登录APP查看全文