Collaborative Research: Geochemistry of Arc Magmas from Luzon and Marinduque Islands, Philippines.

吕宋岛的边界是一个简单的系统， 俯冲带 对比“海洋”菲律宾海板块 华南盆地边缘岩石圈注入 地幔，在那里他们似乎影响了独特的印记， 岩浆源 这个项目将尝试模拟俯冲- 通过地球化学/同位素研究， 来自钙碱性Bicol和Bataan火山的后中新世熔岩 线性构造，以及南部的碱性Taal-Banaiti群 吕宋岛 主要和微量元素以及Be-10、Sr、Nd、 铅、氢和氧同位素将被用来对比 俯冲（稀疏）远洋沉积物和MORB基底， （大量）大陆沉积物和可变MORB “过渡”地下室。 因此，应该可以评估 俯冲硅铝对碱性岩浆成因的影响。 将讨论若干具体问题，包括： 1. 俯冲上地幔的长期历史： 这是MORB，OIB，还是次大陆类型？ 2. 巴丹半岛下地幔交代作用的性质， 比科尔弧线。 3. 辅助相稳定性的重要性;它们 成分缓冲第二阶段交代熔体？ 4. 俯冲衍生的H2O的作用。 该项目将涉及12个活跃或休眠的样本 火山，并与菲律宾的研究协调， 火山学和地震学研究所（PHIVOLCS）， 在西德德国和法国。

The island of Luzon is bounded by a simple system of opposed subduction zones. Contrasting slabs of "oceanic" Philippine Sea and "marginal" South China Basin lithosphere are injected into the mantle, where they appear to impact distinctive imprints on magma sources. This project will attempt to model subduction- induced source evolution through geochemical/isotopic study of post-Miocene lavas from calc-alkalic Bicol and Bataan volcanic lineaments, and the alkalic Taal-Banahaw group in southern Luzon. Data for major and trace elements, and Be-10, Sr, Nd, Pb, H, and O isotopes will be used to contrast effects of subducting (sparse) pelagic sediment and MORB basement with (voluminous) continental sediment and variable MORB "transitional" basement. Thus it should be possible to asses the influence of subducted sial on the genesis of alkalic magma. Several specific questions will be addressed including: 1. The long term history of the suprasubduction mantle: was this of the MORB, OIB, or sub-continental type? 2. The nature of mantle metasomatism beneath the Bataan and Bicol arcs. 3. The significance of accessory phase stabilities; do they compositionally buffer second-stage metasomatic melts? 4. The role of subduction-derived H2O. The project will involve sampling twelve active or dormant volcanoes, and is coordinated with research by the Philippine Institute of Volcanology and Seismology (PHIVOLCS), and research groups in West Germany and France.