昆仑山北坡岛状冻土区西大滩大型饮用矿泉群成因分析

Formation Cause of the Mineral Drinking Springs in Xidatan in Patchy Permafrost Zone on the North Slopes of Kunlun Mountains

在对昆仑山北坡岛状冻土区西大滩大型饮用矿泉群水文地质、导水与控水断裂、水化学等方面实地调查和EH-4高频、电测深勘探的基础上,认为矿泉群的补给源为昆仑山玉珠峰一带的现代冰川底部冰雪覆盖融区水、冰雪消融水、大气降水和地表水.补给源水通过具多期活动性的F3和F4正断层组破碎带补给深层地下水.深层地下水在西倾近南北向正断层组F2及F2-1,2的导水断层破碎带富集并继续向北径流,径流至F1南倾活动性逆断层上盘时,形成富水"三角区",并沿F1断层破碎带排泄出地表,是西大滩大型饮用矿泉群形成的主因.

Basing on the hydrogeological investigation, the water-conducting and water-controlling fractures survey, the water chemistry survey and EH-4 high-frequency deep sounding in the area of Xidatan mineral springs, it is found that the origin of the mineral springs is the meltwater from snow, ice and glaciers, atmospheric precipitation and surface water around the Mount Yuzhu of Kunlun Mountain. The origin water supplies the deep groundwater through active fractures F3 and F4, then riches at almost south-north running normal faults F2 and F2-1,2, which inclines to west, and goes on toward the north, finally, forms a waterrich triangle area, when the water reaches the active reverse faults F1, which inclines to south. Afterwards, the deep groundwater discharges through F1, which is the major cause of the Xidatan mineral springs group.