Hydrothermal Redistribution of PGEs and U-Th-Pb in DSDP Site 504B

摘要一：Peucker-Escherbrink提案编号：98-11209机构：WHOI我们将研究热液蚀变对蚀变洋壳中铂族元素（PGE）和U-Th-Pb分布的影响。 这两组元素被认为是地球上重要分化过程的关键证据。 将对DSDP/ODP 504 B孔的岩石和矿物进行热液蚀变的时间综合效应研究，因为它提供了蚀变洋壳的最完整横截面。 将分析样品中的Re-Ru-Pd-Os（Os同位素）-Ir-Pt、U-Th-Pb（Pb同位素）、Sr同位素和热液蚀变期间移动的补充微量元素（例如，Li、K、Rb、Cs、Ba、Tl、Sb）。 通过对不同蚀变环境样品的同位素和微量元素分析，结合原生和次生矿物组合的矿物分析，将使我们能够确定热液蚀变对洋壳中PGE和U-Th-Pb再分配的影响。

ABSTRACTP.I.: Peucker-Ehrenbrink Proposal Number: 98-11209 Institution: WHOIWe will study the effects of hydrothermal alteration on the distribution of platinum-group elements (PGE) and U-Th-Pb in altered oceanic crust. Elements from both groups are considered key evidence for important differentiation processes on Earth. The time-integrated effects of hydrothermal alteration will be studied on rocks and minerals from DSDP/ODP hole 504B, because it provides the most complete cross-section through altered oceanic crust. Samples will be analyzed for Re-Ru-Pd-Os (Os isotopes)-Ir-Pt, U-Th-Pb (Pb isotopes), Sr- isotopes, and complementary trace elements mobile during hydrothermal alteration (e.g., Li, K, Rb, Cs, Ba, Tl, Sb). Combining isotope and trace element analyses on samples from a variety of alteration environments with analyses of minerals from both primary and secondary mineral assemblages will enable us to constrain the effects of hydrothermal alteration on the redistribution of PGE and U-Th-Pbin oceanic crust.