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桃源地区位于粤东和平县境内,岩性有白垩系残留沉积盖层,寒武系变质岩为花岗岩俘虏体,次火山岩(花岗斑岩、流纹岩等)及晚期辉绿岩等。区内的次火山岩和晚期辉绿岩的展布特征与火山塌陷盆地周围有环状(弧状)和放射状断裂被次火山岩侵入的特征相一致。区域物探、重磁等成果均佐证桃源地区存在弧形构造带。所以,桃源地区为火山塌陷盆地的一角,其构造特征为火山环状构造带。
The Taoyuan area is located in Heping County, eastern Guangdong Province, with lithologically Cretaceous residual sedimentary cover. Cambrian metamorphic rocks are granite captives, subvolcanic rocks (granite porphyry and rhyolite), and late diabase. The distribution characteristics of sub-volcanic rocks and late diabase in the area are consistent with the characteristics of ring-shaped (arc-like) and radial fractures surrounding volcanic collapse basins invaded by sub-volcanic rocks. Regional geophysical, gravity and other achievements have proved that there is arcuate tectonic belt in Taoyuan area. Therefore, Taoyuan area is a corner of the volcanic collapse basin, and its structural features are volcanic ring structure belt.