Dataset for Subduction Initiation and Tectonic Transformation in the Southwestern Mariana Forearc

Four rock samples from the southwestern Mariana arc were analyzed for whole-rock major and trace elements (Supplementary Dataset S1).
Zircon U–Pb age results are shown in Supplementary Dataset S2.
U-Pb age-dating was used to perform 48 analyses of titanites from the amphibolite S12-T3-1, and the results are listed in Supplementary Dataset S3.

对马里亚纳弧西南缘的4件岩石样品开展了全岩主量与微量元素分析（补充数据集S1）。锆石U-Pb定年结果详见补充数据集S2。采用U-Pb年代学方法对角闪岩S12-T3-1中的榍石完成了48次分析，相关结果列于补充数据集S3。