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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >The Lu-Hf isotope geochemistry of shergottites and the evolution of the Martian mantle-crust system
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The Lu-Hf isotope geochemistry of shergottites and the evolution of the Martian mantle-crust system

机译：钙锰矿的Lu-Hf同位素地球化学与火星地幔-壳系统的演化

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摘要

We report the first Lu-Hf isotopic data from SNC (Martian) meteorites with high-precision analyses of five shergottites by plasma sector mass spectrometry. Hf isotopic compositions indicate the presence of both geochemically enriched and depleted components, reflecting early segregation of Martian crust and mantle. Comparison with Sm-Nd and U-Th-Pb isotopic systems suggests that the enriched component reflects the extraction of very small-degree melts at depths in excess of 200 km in the presence of garnet, while the depleted component could correspond to large-degree melts from mantle already depleted by the extraction of enriched liquids. The general lack of correlation between major element composition and isotopic properties of SNC meteorites argues against the segregation of the lithophile elements into Earth-like continents or Moon-like highlands on Mars, although early magma ocean fractionation may explain many of the primary isotopic properties of SNC meteorites. Recent (0.18-0.33 Ga old) fractionation of Lu/Hf and Sm/Nd in shergottites is inconsistent with purely magmatic partitioning of these elements and appears more likely to be a product of metasomatic processes involving the circulation of P_2O_5-rich fluids, triggered either by distant magmatic activity or, more probably, by impacts.
机译：我们通过等离子扇区质谱法报告了来自SNC（火星人）陨石的第一批Lu-Hf同位素数据，并对五种黑锰矿进行了高精度分析。 f同位素组成表明存在富化和贫化的地球化学成分，反映了火星地壳和地幔的早期分离。与Sm-Nd和U-Th-Pb同位素系统的比较表明，富集成分反映了在存在石榴石的情况下，深度超过200 km时提取的小融度，而耗尽的成分可能对应于大融度。从已经通过浓缩液体的开采而耗尽的地幔中融化。尽管SNC陨石的主要元素组成与同位素性质之间普遍缺乏相关性，但反对将嗜石岩元素隔离到火星上的类地球大陆或类似月球的高地，尽管早期岩浆海洋分馏可能解释了SNC陨石的许多主要同位素性质。 SNC陨石。钙铁矿中Lu / Hf和Sm / Nd的最近（0.18-0.33 Ga年龄）分级与这些元素的纯粹岩浆分配不一致，并且似乎更可能是涉及P_2O_5富集流体循环的变质作用产物。通过遥远的岩浆活动或更可能是通过撞击。

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