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

DSDP 504B 站点中 PGE 和 U-Th-Pb 的热液再分布

• 批准号: 9811209
• 负责人: Bernhard Peucker-Ehrenbrink
• 金额: $ 21.65万
• 依托单位: Woods Hole Oceanographic Institution
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-11-01 至 2000-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9811209&HistoricalAwards=false
• 关键词: Hydrothermal; Redistribution; PGEs; Th; Pb

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.

摘要：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。由于DSDP/ODP 504B孔提供了最完整的蚀变洋壳截面，因此将研究热液蚀变对岩石和矿物的时间积分效应。样品将分析Re-Ru-Pd-Os （Os同位素）- ir - pt, U-Th-Pb （Pb同位素），Sr-同位素以及热液蚀变过程中互补的微量元素（例如Li， K, Rb, Cs, Ba, Tl, Sb）。将不同蚀变环境样品的同位素和微量元素分析与原生和次生矿物组合的矿物分析相结合，将使我们能够约束热液蚀变对PGE和U-Th-Pbin海洋地壳再分布的影响。