Collaborative: Mantle Control of a Dynamically Evolving Spreading Center: Temporal Aspects

在这个项目中，P.I.s将对31-35S的两个缓慢-中间扩散的MAR段进行联合实地（地球化学）和建模研究。私家侦探希望利用尤因在提议时间出现在大西洋这片海域的机会。他们将重点关注33S附近的两个沿轴地球化学异常：第一个是在第4段的206Pb/204Pb峰值，第二个是在第3段的高Na8.0/低Fe8.0异常。P.I.s认为，在后者，他们可以获得对变换断层效应（TFE）的时间分量的最佳约束。这两个异常的零年龄和离轴采样（至8 Ma古地壳）将使他们能够破译地幔地球化学非均质性和熔融过程的程度。利用这些约束条件，P.I.s最终希望建立令人满意的上地幔非均质性和对流模型。Michael &amp； Hanan将担任联席主席。Michael将对塔尔萨的玻璃进行电子探针分析，并使用离子探针（WHOI）、DCP （Lamont）或ICP-MS （Cornell）对微量元素进行分析。哈南将负责同位素工作。

OCE-09314647 In this project, the P.I.s will carry out a combined field (geochemical) and modelling study on two segments of the slow- intermediate spreading MAR at 31-35S. The P.I.s wish to capitalize on a possible window of opportunity of Ewing being in this part of the Atlantic around the proposed time. They will focus on two along axis geochemical anomalies near 33S: the first is a 206Pb/204Pb spike at segment 4, and the second is high Na8.0/low Fe8.0 anomaly at segment 3. The P.I.s contend that in the latter area they can obtain best constraints on the temporal component of a transform fault effect (TFE). Zero-age and off-axis sampling (to 8 Ma old crust) of these two anomalies will allow them to decipher the extent of mantle geochemical heterogeneities and melting processes. Using such constraints the P.I.s ultimately wish to develop satisfactory models of upper mantle heterogeneities and convection. Michael & Hanan will be co-chiefs. Michael will perform electron probe analysis of glasses at Tulsa and trace elements with Ion Probe (WHOI), DCP (Lamont) or ICP-MS (Cornell). Hanan will be responsible for isotopic work.