Western Northern Luzon Isotopic Evidence of Transition from Proto‐South China Sea to South China Sea Fossil Ridge Subduction
TECTONICS(2020)
摘要
Temporal geochemical comparisons are conducted for representative magmatism from western Northern Luzon to reconstruct the Cenozoic tectonics. Oligo-Pleistocene magmas from western Northern Luzon display elemental and Sr-Nd-Hf-Pb-O isotope geochemistry similar to intraoceanic arc magmatism, consistent with derivation from the mantle wedge, coupled with fractional crystallization. Specifically, the Oligo-Miocene (similar to 26.8-15.6 Ma) Central Cordillera diorite complex samples exhibit a negative correlation between Sr-Nd isotopes, consistent with mantle metasomatism by fluids/melts released from pelagic sediments. The Mio-Pleistocene samples (similar to 9 Ma) magmatism exhibit intraoceanic arc isotopic signatures, suggestive of a chemical imprint from subducted pelagic sediments. The Mio-Pleistocene (更多
查看译文
AI 理解论文
溯源树
样例
生成溯源树,研究论文发展脉络
Chat Paper
正在生成论文摘要