水岩相互作用下结晶岩的矿物演化  

EVOLUTION OF MINERAL UNDER INTERACTION OF WATER AND CRYSTALLINE ROCK

作　　者：戚国庆[1] 黄润秋[1] 彭汉兴[2] 

机构地区：[1]成都理工大学地质灾害防治国家专业实验室,四川成都610059 [2]河海大学土木工程学院,江苏南京210098

出　　处：《矿物岩石》2004年第1期43-47,共5页Mineralogy and Petrology

摘　　要：　水岩相互作用下,结晶岩中的长石、角闪石、黑云母、石英等矿物发展演化为粘土矿物,往往造成结晶岩体中的构造破碎带"泥化",形成泥化带,力学强度降低。发育于三峡坝址船闸区结晶岩中的F215泥化带就是长期水岩相互作用的产物,由于其力学性状较差,变形模量仅0.2GPa～1.0GPa,对升船机和永久船闸的基础应力传递不利,且直接影响到升船机的运行安全。以F215泥化带为例,通过对该泥化带的矿物成分、微结构特征,以及周围水文地质环境等方面的调查和分析研究,对水岩相互作用下,结晶岩中构造破碎带"泥化"的演化过程,以及泥化带的分布规律进行研究,结果表明:1)F215泥化带目前的发展尚处在结晶岩风化的饱和硅铝阶段;2)水岩相互作用形成的泥化带必然沿那些胶结较差、导水性较好的断裂破碎带分布。The aluminosilicate minerals in crystalline rock, including feldspar,amphibole, biotite, quartz, etc, begin to develop into clay minerals under interaction of water and rock,which usually creates the engineering geology problem and makes the fracture zone in crystalline rock become into argillization zone. The argillization zone (F_(215)) in SanXia navigation lock area was developed by fracture zone under interaction of water and rock. The argillization zone (F_(215)) possesses low strength of 0.2 GPa～1.0 GPa deformation modulus,which is disadvantage to stress transfer of the foundation of the ship elevator and the navigateon lock,and disadvantage to safety in operation of the ship elevator.In this paper, evolution process of crystalline rock mineral under interaction of water and rock and,the regularities of distribution of argillization zone which generated by interaction of water and rock were studied.The results show:1)the argillization zone (F_(215)) is now under the development stage of saturated aluminium-silicon in process of crystalline rock weathering, 2)the argillization zone occurs along the fracture zone with well-developed permeability and poor cementation.

关 键 词：水岩 结晶岩 水文地球化学 矿物演化 泥化带 

分 类 号：P592[天文地球—地球化学]