一、前言 寿昌地区位于寿昌—马剑火山构造洼地中段(图1),西至田坂村,东至儒源, 南至童家,北至石马头,总面积约500km~2,是浙西中生代火山—沉积岩系发育的典型地区。 寿昌—马剑火山构造洼地,是燕山运动早期在区域复式背斜隆起基础上因断陷作用而形成的火山岩盆地。东南是金衢盆地和浦江盆地,多以断裂为界;北西为桐庐—淳安复式向斜,亦多以断裂为界;南西和北东均以沉积不整合覆盖于下古生代地层或更老的 Foreword Shouchang area is located in the middle section of Shouchang-Majian volcanic tectonic depression (Fig. 1), west to Tianbancang, east to Confucianism, south to Tongjia and north to Shimantou. The total area is about 500km ~ 2 A Typical Area for the Development of Mesozoic Volcanic - Sedimentary Rocks in Western Zhejiang Province. The Shouchang-Majian volcanic tectonic depression is the volcanic basin formed by the fault depression on the basis of the regional compound anticline uplift in the early Yanshan movement. The southeast is the Jinqu and Pujiang basins, mostly fault-bounded; the northwest is the Tonglu-Chunan syncline and is also mostly fault-bounded; the southwest and northeast are covered by sedimentary unconformities in the Lower Paleozoic strata or older