Layering of the Oceanic Lithosphere: Petrologic Study of Hawaiian Xenoliths and Abyssal Peridotites - A Renewal

大洋岩石圈的分层：夏威夷捕虏体和深渊橄榄岩的岩石学研究 - 更新

• 批准号: 9810961
• 负责人: Gautam Sen
• 金额: --
• 依托单位: Florida International University
• 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: 1998-09-01 至 2002-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9810961&HistoricalAwards=false
• 关键词: Layering; Oceanic; Lithosphere; Petrologic; Study

9810961 Sen This project will investigate the melting process beneath a 90 million year old mid-oceanic ridge using trace element and isotopic characteristics of lithospheric xenoliths from Oahu, Hawaii. REE and Nd, Sr isotopic analysis will be obtained on clinopyroxenes from a suite of spinel lherzolite and rare plagioclase lherzolite xenoliths. These data will be used to (1) verify the source compositions of the xenoliths, (2) determine the melt production rates (dF/dP) over a depth at less than 0.5 Gpa, (3) evaluate the role of melt refertilization, and (4) reconstruct the super-solidus melting trajectory (i.e., mantle flow lines) from pyroxene thermobarometry.

这个项目将利用夏威夷瓦胡岛岩石圈捕虏体的微量元素和同位素特征，研究一个9000万年历史的洋中脊下面的融化过程。对一套尖晶石橄榄岩和稀有斜长石橄榄岩捕虏体中的斜辉石进行了REE和Nd、Sr同位素分析。这些数据将用于(1)验证包体的来源成分，(2)确定小于0.5 Gpa深度的熔体产生速率（dF/dP），(3)评估熔体再作用的作用，以及(4)根据辉石热气压计重建超固体熔化轨迹（即地幔流线）。