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今点子 - 2010/12/30 19:47:50

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石河

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      后石坞一带出露的岩石,为傲徕山期侵入岩体的中粒片麻状二长花岗岩和细粒片麻状二长花岗岩,岩石比较致密和坚硬,抗风化能力强,但垂直节理和水平节理十分发育,把岩石切割成许多厚薄不一的板状块体。此处由于季节和昼夜温差变化大,热胀冷缩物理风化作用和寒冻风化作用非常显著,冰劈作用十分活跃,使岩块发生强裂崩解破坏,在重力作用下,崩解的岩石就沿垂直和水平的节理面发生大规模崩塌,形成悬崖峭壁和奇峰怪石,并大量滚落下来堆积在山坡上或沟涧内,这些杂乱的巨石,有的在山坡成片产出达上千平方米,犹如石头的海洋,称之为“石海”,有的沿沟涧呈带状分布,称之为“石河”。';9Ë %íiwww.0370qmw.comþvê8¶º§:
whn - 2017/4/18 16:00:32
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