Accomplishment Based Renewal: Comparing the Thermal Histories of Fast- and Slow-spreading Oceanic Crust

基于成就的更新：比较快速和缓慢扩散的洋壳的热史

• 批准号: 0426160
• 负责人: Peter Kelemen
• 金额: --
• 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: 2004
• 资助国家: 美国
• 起止时间: 2004-08-01 至 2005-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0426160&HistoricalAwards=false
• 关键词: Accomplishment; Based; Renewal; Comparing; Thermal

Under this funding, the PI will carry out a petrological study of samples from igneous lower crust formed beneath oceanic spreading centers, in order to constrain lower crustal cooling rates as a function of depth and spreading rate. The proposed study will use samples and data from the PI's Oman work, supplemented by gabbro and peridotite from 14 to 16 degrees North on the Mid-Atlantic Ridge (MAR, ODP Leg 209), the SW Indian Ridge (SWIR, ODP Legs 118, 176 and179), and the East Pacific Rise (EPR, Hess Deep, ODP Leg 147). The PI will employ an array of "geospeedometry" techniques to determine closure temperatures and pressures for igneous and metamorphic equilibria, widths and compositions of exsolution lamellae, major and trace element diffusion profiles within mineral grains and outcrops, and crystal size distributions. Using these data, he will estimate relative and absolute cooling rates.

在这笔资金下，PI将对在海洋扩张中心下方形成的火成岩下地壳样品进行岩石学研究，以限制下地壳冷却速率作为深度和扩张速率的函数。拟议的研究将使用来自PI阿曼工作的样本和数据，并辅以大西洋中脊（MAR，ODP Legs 209），西南印度洋脊（SWIR，ODP Legs 118，176和179）和东太平洋隆起（EPR，Hess Deep，ODP Legs 147）北纬14至16度的辉长岩和橄榄岩。PI将采用一系列“地质速度测量”技术来确定火成岩和变质平衡的闭合温度和压力、出溶纹层的宽度和组成、矿物颗粒和露头内的主要和微量元素扩散剖面以及晶体尺寸分布。利用这些数据，他将估计相对和绝对冷却速率。