铜仁碧江石林地质特征及成因分析

Analyses on Geologic Characteristics and Genesis of Bijiang Stone Forest in Tongren

铜仁碧江石林是2016年碧江区旅游资源普查新发现最有开发价值的地文景观资源之一,为一处极为特殊的地质遗迹资源,发育在锦江北岸石灰岩顶盖上,石林普遍高1 25 m,象形山石众多,经省级终评为四级旅游资源。本文从碧江石林的地质特征及地质演化出发,对石林及其中象形山石的成因进行了分析,认为石林的形成主要经过了岩石形成、地下水溶蚀和地表塑造三个阶段,发育步骤为从节理裂隙—溶蚀网—埋藏石芽—溶沟、溶槽—高度增加—相互分离—成片石芽、石林。同时由于岩石组分局部不一致,可溶性存在差异和北东向、北东东向和近东西向三组节理裂隙的形成,加上地下水的侵蚀和溶蚀作用,从而形成了形态各异的象形山石。

Bijiang stone forest is one of the landscape resources of newly discovered in Bijiang district tourism resources survey at 2016,it＇s a special geological heritage resource with great value,it developed on limestone tectum of south Jinjiang,the general height is 1 ~ 25 m and have abundant pictographic rocks,was rated to be level 4 tourism resource. With the geologic characteristics and evaluation of Bijiang stone forest,the genesis of stone forest abd its pictographic rocks are analyzed,it＇s thought the stone forest formation has 3 stages： rock formation,groundwater corrosion and surface building,the developing process is joint fracture-corrosion net-burried clint-channelling,fluid bowl-height increasing-seperation-stone forest formation. Because of part conformity of rock component,different solubility,formation of NE,NEE and near EW joint fracture,erosion and corrosion of groundwater,different pictographic rock formed.