Western Northern Luzon Isotopic Evidence of Transition from Proto-South China Sea to South China Sea Fossil Ridge Subduction

Text S1-3 present detailed sample description, analytical methods (Text S1), discussion on emplacement age of the Central Cordillera diorite complex (Text S2) and evaluation of post-magmatic alteration (Text S3) for the western Northern Luzon igneous rocks. The supporting figures provide 1) spatial variation of Sr isotope composition, 2) microphotographs, 3) zircon CL images, 4) plots of K2O and Sr-Nd-Pb isotope composition versus LOI, and 5) correlations between Sr-Nd isotope composition and silica for the western Northern Luzon igneous rocks. The supporting tables provide original data used in the main article.

补充文本S1至S3针对北吕宋西部火成岩，详细提供了样品描述、分析方法（补充文本S1）、中央科迪勒拉闪长岩杂岩体就位年龄的相关探讨（补充文本S2）以及岩浆期后蚀变的评估分析（补充文本S3）。配套附图包含5项内容：1）北吕宋西部火成岩的Sr同位素组成空间变化特征；2）显微照片；3）锆石阴极发光（Cathodoluminescence，CL）图像；4）K₂O、Sr-Nd-Pb同位素组成相对于烧失量（Loss on Ignition，LOI）的散点图；5）Sr-Nd同位素组成与二氧化硅含量之间的相关关系。配套附表则提供了正文主文所用的全部原始实验数据。