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首页> 外文期刊>Contributions to Mineralogy and Petrology >Small-scale transport of trace elements Nb and Cr during growth of titanite: an experimental study at 600 °C, 0.4 GPa
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Small-scale transport of trace elements Nb and Cr during growth of titanite: an experimental study at 600 °C, 0.4 GPa

机译：钛矿生长过程中微量元素Nb和Cr的小规模迁移：在600°C，0.4 GPa下的实验研究

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摘要

Trace element distribution in titanite overgrowths on rutile has been investigated experimentally at 600 °C, 400 MPa and f_(O2) near NiNiO buffer. Composi-tionally homogenous Cr- or Nb-doped synthetic rutile single crystals or Nb-containing natural rutile crystals were the source of Cr, Nb and Ti to synthesize titanite using the double-capsule technique. All element exchange with the source of Si, Ca and Al occurred via a NaCl-H_2O fluid. Titanite forms quickly and exclusively around the rutile crystals. The titanite overgrowth separates rutile from the bulk fluid, and all elements from rutile dissolution have to pass through the titanite rim. Trace element concentrations in titanite show a considerable scatter in experiments with and without Al, although the average concentrations of Cr or Nb of titanite around compositionally homogeneous synthetic rutile approach the expected values for closed system conditions.
机译：已在600°C，400 MPa和Ni_NiO缓冲液附近的f_（O2）上通过实验研究了金红石上钛铁矿过度生长中的痕量元素分布。组成均质的Cr或Nb掺杂的合成金红石单晶或含Nb的天然金红石晶体是使用双胶囊技术合成钛矿的Cr，Nb和Ti的来源。与硅，钙和铝源的所有元素交换均通过NaCl-H_2O流体进行。钛铁矿快速且专门围绕金红石晶体形成。钛铁矿的过度生长将金红石与散装流体分离，所有来自金红石溶解的元素都必须穿过钛铁矿的边缘。在有铝和无铝的实验中，尽管在组成均质的合成金红石周围的钛矿中Cr或Nb的平均浓度接近封闭系统条件下的预期值，但钛矿中痕量元素的浓度却显示出相当大的分散。

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