近来收集了航磁和重力测量资料,结合现有资料进行了全国范围的地质填图,并利用这些资料在北萨地区进行重—磁异常分析,探讨了地球物理模型与低温热液金银矿化之间的关系。 金银矿床经常赋存于磁性体的边部,据推断这些磁性体位于樱岛,雾岛火山的西北部。金银矿床也沿小封闭的重力高分布。经研究发现,观察到的磁异常与经地形模拟和地表地质所引起的磁异常对应较差,这使我们得出这样的结论:磁异常并不是由上新世到早更新世火山岩的出露引起的,而是由隐伏的侵入岩所引起。小封闭的重力高被解释为是隐伏的岩株状岩体引起。 岩浆的侵入作用促使裂隙系统和热液对流现象加剧。因此,赋存在推测的磁性体边部的金银矿床是原生的。考虑到这些侵入岩当时的温度低于居里点之下,现代热泉分布在侵入体及其周围、以及参考九州岛南部的居里点深度图,我们推测岩浆侵人活动与上新世至早更新世的火山活动有密切关系 Recently, aeromagnetic and gravimetric data have been collected, and a nationwide geological mapping has been carried out based on the available data. Based on these data, heavy-magnetic anomalies have been analyzed in the Beisa region, and geophysical models and low-temperature hydrothermal gold- The relationship between Gold and silver deposits often occur in the edge of the magnetic body, it is concluded that these magnetic body is located in the Sakurajima, Kirishima volcanic northwest. Gold and silver deposits are also distributed along a small closed gravity high. The study found that the observed magnetic anomalies are correspondingly poorly correlated with the magnetic anomalies caused by topographic modeling and surface geology, leading us to the conclusion that magnetic anomalies are not the result of the Pliocene to Early Pleistocene volcanic exhumation Caused by the hidden intrusive rocks. The small enclosed gravity is interpreted as being caused by a hidden rock-like mass. Magmatic intrusive facilitation of fissure systems and hydrothermal convection intensifies. Therefore, the gold and silver deposits present at the edge of the presumed magnetic body are native. Considering that the temperature of these intrusive rocks was below the Curie point, the modern hot springs were located in and around the intrusion and the Curie Point Depth Map of the southern part of Kyushu Island, we speculated that the magmatic intrusion and the Pliocene- Early Pleistocene volcanic activity is closely related