Determination of Fe‐Mg partitioning between perovskite and magnesiowüstite
Determination of Fe‐Mg partitioning between perovskite and magnesiowüstite
复制标题
钙钛矿和镁方铁矿之间 Fe-Mg 分配的测定
DOI：
10.1029/96gl02086
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发表时间：
1996
影响因子：
5.2
通讯作者：
E. Ito
中科院分区：
文献类型：
--
作者：
T. Katsura;E. Ito
采用B_2O_3催化技术测定了铁、镁在钙钛矿型K-Mg-Fe-PV-MW中的分配系数。目前的实验结果表明，与以往的研究结果相比，K-Mg-Fe PV-MW是一个更接近于1的因子。随着镁闪锌矿的镁含量从50增加到86，K镁铁的PV-MW从0.16增加到0.35。根据这些结果，金刚石中顽火辉石和镁闪锌矿的组成表明，下地幔顶部的温度为1870-2040K，对于热解地幔模型，下地幔顶部的钙钛矿和镁闪锌矿的Mg#(100 mg/(mg+Fe))分别为93和82-83。这项研究估计的下地幔温度上限不允许钙钛矿的比例大于热解地幔的比例。
The partition coefficient of Fe and Mg between perovskite and magnesiowostite K Mg-Fe Pv-Mw has been measured by adopting a B 2 O 3 catalyst technique. The present experimental results demonstrate that K Mg-Fe Pv-Mw is a factor of two closer to unity than that obtained in previous studies. K Mg-Fe Pv-Mw increases from 0.16 to 0.35 with increasing Mg# of magnesiowustite from 50 to 86. On the basis of these results, the compositions of enstatite and magnesiowustite included in diamond imply that the temperature at the top of the lower mantle is 1870-2040 K. The Mg# (100Mg/(Mg+Fe)) of perovskite and magnesiowustite at the top of the lower mantle are 93 and 82-83, respectively, for a pyrolitic mantle model. The upper bound of the lower mantle temperature estimated in this study do not allow a larger fraction of perovskite than the pyrolitic mantle.