Partitioning of Ru, Rh, Pd, Re, Ir, and Au between Cr-bearing spinel, olivine, pyroxene and silicate melts 1 1 Associate editor: C. R. Neal
Partitioning of Ru, Rh, Pd, Re, Ir, and Au between Cr-bearing spinel, olivine, pyroxene and silicate melts 1 1 Associate editor: C. R. Neal
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DOI：
10.1016/j.gca.2003.07.005
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发表时间：
2004-02
影响因子：
5
通讯作者：
K. Righter;A. Campbell;M. Humayun;R. Hervig
中科院分区：
文献类型：
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作者：
K. Righter;A. Campbell;M. Humayun;R. Hervig
通过一系列高温实验研究了几种高亲铁元素（HSE、Ru、Rh、Pd、Re、Os、Ir、Pt和Au）在富cr尖晶石、橄榄石、辉石和硅酸盐熔体之间的分配。在镍-镍氧化物（NNO）和赤铁矿-磁铁矿（HM）氧缓冲液之间的氧逸度下，分别在1 bar、19 kbar和20 kbar的温度范围（1200 ~ 1300℃）下对夏威夷ankaramite、合成长长玄武岩和DiAn共晶熔体进行了试验。高氧逸度被用来抑制硅酸盐熔体中富硒“块”的形成。利用SIMS和LA-ICP-MS分析所得的氧化物和硅酸盐晶体（<100 μm），空间分辨率为15 ~ 50 μm。铼、Au和Pd在富cr尖晶石中均不相容（DResp/melt= 0.0012-0.21, DAusp/melt= 0.076, DPdsp/melt= 0.14），而Rh、Ru和Ir均高度相容（DRhsp/melt= 41-530, DRusp/melt= 76-1143, DIrsp/melt= 5-22000）。铼、钯、金、钌在橄榄石中均不相容（DReoliv/melt= 0.017 ~ 0.073, DPdoliv/melt= 0.12, DAuoliv/melt= 0.12, DRuoliv/melt= 0.23）， Re在正辉石和斜辉石中不相容（DReopx/melt= 0.013, DRecpx/melt= 0.18 ~ 0.21）， Pt在斜辉石中相容（DPtcpx/melt= 1.5）。研究人员将结果与之前关于尖晶石结构氧化物之间HSE划分的研究结果进行了比较和结合，并将其应用于一些天然岩浆层，以证明其一致性。
A series of high temperature experiments was undertaken to study partitioning of several highly siderophile elements (HSE; Ru, Rh, Pd, Re, Os, Ir, Pt and Au) between Cr-rich spinel, olivine, pyroxene and silicate melt. Runs were carried out on a Hawaiian ankaramite, a synthetic eucrite basalt, and a DiAn eutectic melt, at one bar, 19 kbar, and 20 kbar, respectively, in the temperature range of 1200 to 1300°C, at oxygen fugacities between the nickel-nickel oxide (NNO) and hematite-magnetite (HM) oxygen buffers. High oxygen fugacities were used to suppress the formation of HSE-rich “nuggets” in the silicate melts. The resulting oxide and silicate crystals (<100 μm) were analyzed using both SIMS and LA-ICP-MS, with a spatial resolution of 15 to 50 μm. Rhenium, Au and Pd were all found to be incompatible in Cr-rich spinel (DResp/melt= 0.0012–0.21, DAusp/melt= 0.076, DPdsp/melt= 0.14), whereas Rh, Ru and Ir were all found to be highly compatible (DRhsp/melt= 41–530, DRusp/melt= 76–1143, DIrsp/melt= 5–22000). Rhenium, Pd, Au and Ru were all found to be incompatible in olivine (DReoliv/melt= 0.017–0.073, DPdoliv/melt= 0.12, DAuoliv/melt= 0.12, DRuoliv/melt= 0.23), Re is incompatible in orthopyroxene and clinopyroxene (DReopx/melt= 0.013, DRecpx/melt= 0.18–0.21), and Pt is compatible in clinopyroxene (DPtcpx/melt= 1.5). The results are compared to and combined with previous work on HSE partitioning among spinel-structured oxides, and applied to some natural magmatic suites to demonstrate consistency.