古城位于甘肃省岷县境内,我們在进行引洮上总干渠渠首工程地質条件研究时,曾在本区做过一些工作,收集了一些与新構造运动有关的資料,现在写出来供大家参考。古城位于西秦嶺褶皱帶北部拗陷帶中,出露的地层主要为中石炭紀,岩性屬浅海相浅变質岩系。此系地层具有如下兩个特点: 1.單层厚度薄,常为1—2厘米。最厚的石英砂 The ancient city is located in Minxian County, Gansu Province. During the study on the geological conditions of the main channel of the main canal, we have done some work in this area and collected some information related to the new tectonic movement. Now we write it out for your reference . The ancient city is located in the northern depression belt of the West Qinling Fold Belt. The exposed strata are mainly of the Middle Carboniferous and the lithology is a shallow marine metamorphic rock series. The Department has the following two characteristics of the formation: 1. Monolayer thickness is thin, often 1-2 cm. The thickest quartz sand