区域地质苏拉威西北部海湾地质是以始新世至近代典型的岛弧组合为特征(Hamilton,1979)。老基底由闪岩、云母片岩、片麻岩、变质灰岩及花岗岩组成,出露在 Palu、Tolitoli 和 Moutong 一带北部海湾的西部,而且可能向东延伸至 Pani 地区。Marisa 地区地质以始新世(?)玄武岩为主,包括枕状熔岩及薄层深海沉积物夹层(红色粉砂岩), Regional geology The northern Gulf of Sulawesh is characterized by a typical arc-arc assemblage from Eocene to modern times (Hamilton, 1979). The old basement, consisting of amphibolite, micritic schist, gneiss, metamorphic limestone and granite, emerges to the west of the northern Gulf of Palu, Tolitoli and Moutong and may extend eastward to the Pani area. The Marisa area is dominated by Eocene (?) Basalts, including pillow lava and thin-bedded deep-sea sediments (red siltstone)