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首页> 外文期刊>Chemical geology >The concentration of platinum-group elements and gold in southern African and Karelian kimberlite-hosted mantle xenoliths: Implications for the noble metal content of the Earth's mantle
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The concentration of platinum-group elements and gold in southern African and Karelian kimberlite-hosted mantle xenoliths: Implications for the noble metal content of the Earth's mantle

机译：南部非洲和卡累利阿金伯利岩沉积的地幔异岩中铂族元素和金的浓度：对地幔中贵金属含量的影响

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摘要

We have determined the concentrations of the platinum-group elements and gold in 111 mantle xenoliths from more than 20 kimberlite pipes in southern Africa and the Karelian craton, Fennoscandian Shield, with the aim to constrain the composition of the Archean- early Proterozoic primitive mantle. Average noble metal contents of the southern African peridotite xenoliths (in ppb) are 3.67 Ir, 6.54 Ru, 0.93 Rh, 4.3 Pt, 1.84 Pd, and 1.09 Au, and for the Karelian xenoliths 3.75 Ir, 6.58 Ru, 0.79 Rh, 4.84 Pt, 2.28 Pd, and 1.46 Au. The distribution of PGE-bearing phases is heterogenous, as in previously published datasets of lithospheric mantle from the Kaapvaal and other cratons. We argue that the heterogenous noble metal content of the cratonic lithospheric mantle is partly due to sluggish equilibration of the Archean mantle with late veneer (Maier et al., 2009, Nature, v. 460, 620-623). As a result, the noble metal content of the primitive mantle cannot be accurately determined using cratonic mantle samples. Younger mantle rocks (e.g., orogenic and oceanic peridotites) show more homogenous noble metal contents, but since they formed after the onset of crust formation it is debatable whether their composition accurately defines the noble metal content of PUM.
机译：我们已经确定了南部非洲20多个金伯利岩管和卡累利阿克拉通Fennoscandian Shield中111种地幔岩中的铂族元素和金的浓度，目的是限制太古宙元古代的原始地幔的组成。南部非洲橄榄岩异种岩的平均贵金属含量（ppb）为3.67 Ir，6.54 Ru，0.93 Rh，4.3 Pt，1.84 Pd和1.09 Au，而卡累利阿异岩的3.75 Ir，6.58 Ru，0.79 Rh，4.84 Pt ，2.28 Pd和1.46 Au。含PGE的相的分布是不均匀的，如先前发布的来自Kaapvaal和其他克拉通的岩石圈地幔数据集一样。我们认为克拉通岩石圈地幔中的异质贵金属含量部分归因于太古宙地幔与晚期单板的缓慢平衡（Maier等，2009，Nature，v。460，620-623）。结果，使用克拉通地幔样品不能准确地确定原始地幔中的贵金属含量。年轻的地幔岩石（例如造山带和海洋橄榄岩）显示出更均一的贵金属含量，但是由于它们是在地壳形成之后形成的，因此其组成是否准确定义了PUM的贵金属含量尚有争议。

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