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

9810961 Sen该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9000万年前的大洋中脊之下的熔融过程。对一套尖晶石二辉橄榄岩和稀有斜长二辉橄榄岩包体中的单斜辉石进行了稀土元素和单斜辉石的稀土、锶同位素分析。这些数据将被用来(1)验证捕虏体的来源成分，(2)确定低于0.5 Gpa的深度上的熔体产生率(df/dp)，(3)评估熔体参考的作用，以及(4)从辉石温压计重建超固相线熔融轨迹(即地幔流线)。

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.