Collaborative Research: Chlorine Isotopic Composition of Subduction Zone Pore Waters and Sediments

将对巴巴多斯、南开和马里亚纳三个地质、沉积学和水文不同的俯冲系统的六个地点的流体和固体样品进行Cl浓度和同位素组成分析。在先前广泛的地质、矿物学、化学和同位素表征的基础上，本研究仔细选择了孔隙水、沉积物、蚀变玄武岩及其相关矿物分离物的样品。重点将放在重要和丰富的海底含水硅酸盐，特别是粘土矿物（如蒙脱石、伊利石、绿泥石）、其他云母、蛇纹石、滑石和角闪石上。还将分析自生含水矿物的潜在前驱相（如火山弧玻璃和凝灰岩）。这个新的数据集将根据动力学同位素富集（即扩散）、平流质量输运和流体-岩石反应模型进行解释，并应用于发生在收敛边缘的过程。

9634593 Spivack Fluid and solid samples will be analyzed for Cl concentration and isotopic composition from six sites in three geologically, sedimentology, and hydrologically different subduction systems: Barbados, Nankai, and Mariana. On the basis of previous extensive geologic, mineralogic, chemicals, and isotopic characterizations, samples of pore waters, sediments, altered basalts, and their related mineral separates have been carefully selected for this study. Emphasis will be placed on the important and abundant ocean floor hydrous silicates, especially clay minerals (e.g., smectite, illite, chlorite), other micas, serpentine, talc, and amphibole. Potential precursor phases of authigenic hydrous minerals will also be analzyed (e.g. volcanic arc glass and tuffs). This new data set will be interpreted in terms of kinetic isotopic enrichment (i.e., diffusion), advective mass transport, and fluid-rock reaction models and applied to processes occuring in convergent margins.