The Cretaceous History of the South Pacific Thermal and Isotopic Anomaly: The Magellan Seamounts

这项研究将进行海洋地球物理，地质， 地球化学和年代学调查， 西太平洋的麦哲伦、马歇尔和威克省 海洋 目的是记录白垩纪的 南太平洋同位素和热异常。 激光聚变 40 Sr/39 Ar定年将提供样品的年龄控制。 山东省辉长岩矿物放射性同位素地球化学研究 斑晶将用于避免海水蚀变效应。 重力数据将根据弹性厚度进行反演 岩石圈和磁力调查将有助于确定 古磁极 因此，这项工作将提供限制 关于南太平洋白垩纪同位素和热 100 Ma前太平洋板块运动的模拟及其对地壳运动的制约 白垩纪视极移路径及识别 潜在的热点链

This Study will conduct a marine geophysical, geological, geochemical, and chronological investigation of 19 seamounts in the Magellan, Marshall, and Wake provinces in the western Pacific ocean. The goal is to document the Cretaceous Expression of the South Pacific Isotopic and Thermal Anomaly. Laser fusion 40Sr/39Ar dating will provide the age control on the samples. Radiogenic isotope geochemistry of mineral Separates of phenocrysts will be used to avoid seawater alteration effects. Gravity data will be inverted with respect to elastic thickness of the lithosphere and magnetic surveys will serve to determine the magnetic paleopoles. Thus this work will provide constraints on the Cretaceous extent of South Pacific Isotopic and Thermal Anamaly on Pacific plate motion prior to 100 Ma, constraints on the Cretaceous apparent polar wander path, and identification of potential hotspot chains.