大别山腹地桃园寨中生代火山机构的厘定及其地质意义

DETERMINATION OF THE MESOZOIC VOLCANIC EDIFICE AT TAOYUANZHAI IN THE INTERIOR OF THE DABIE MOUNTAINS AND ITS GEOLOGICAL IMPLICATIONS

通过安徽省岳西县桃园寨地区大比例尺火山岩填图及岩石学、地球化学等详细研究，确定了大别山腹地片麻岩基底上残存了中生代火山岩及火山机构。说明中生代之前，大别山体并未大幅度隆升，也非中生代造山带根部，燕山期大规模岩浆活动才是山体剧烈抬升的主要因素。

Based on largescale geological mapping of volcanic rocks and detailed petrological and geochemical studies of the volcanic rocks at Taoyuanzhai, Yuexi county, Anhui province, the authors have determained that there exist relict Mesozoic volcanic rocks and volcanic edifice in the gneiss basement in the interior of the Dabie Mountains. It shows that the Dabie Mountain block had neither risen by a large amplitude before the Mesozoic nor was the rootmountain of the Mesozoic orogenic belt. The main factor for the dramatic uplift of the Dabie Mountain block was the largescale magmatism in the Yanshanian period.