Diffusive fractionation of Li isotopes in wet, highly silicic melts
Diffusive fractionation of Li isotopes in wet, highly silicic melts
复制标题
湿的高硅熔体中锂同位素的扩散分馏
DOI：
--
复制
发表时间：
2018
期刊：
影响因子：
--
通讯作者：
J. Villeneuve
中科院分区：
文献类型：
--
作者：
M. Holycross;E. Watson;F. Richter;J. Villeneuve
合成流纹岩复合粉料是将高纯硅酸盐矿物粉料和氧化物粉料在玛瑙研钵和研钵中在乙醇中研磨而成。用于扩散偶实验的流纹岩是以莱克县黑麻岩(LCO；表S-1)的成分为基础的。在流纹岩粉末中掺入了两种不同的碳酸锂(Li2CO3)的混合物，其中一种含有95at。%6Li和一个同位素正常值(即7Li/6Li=12.16)，以产生与7Li/6Li≈1.3的Li2CO3混合物。一种流纹岩粉末被掺杂，使其含有500ppm的全锂，第二等分的流纹岩被掺杂到180ppm的全锂。粉末在铂坩埚中沉积，在1000℃的箱式炉中脱碳8h，脱碳后温度升至1300℃，样品在炉中过夜形成均匀的硅酸盐熔体。
Synthetic rhyolite composition powders were formed by grinding high purity silicate mineral and oxide powders under ethanol in an agate mortar and pestle. The rhyolite used in diffusion couple experiments is based on the composition of Lake County Obsidian (LCO; Table S-1). Rhyolite powders were doped with a mixture of two different lithium carbonates (Li2CO3), one containing 95 at. % 6Li and one isotopically normal (i.e. 7Li/6Li = 12.16) to create a Li2CO3 mix with 7Li/6Li ≈ 1.3. One rhyolite powder was doped so that it contained 500 ppm total Li and a second aliquot of rhyolite was doped to 180 ppm total Li. The powders were deposited in Pt crucibles and decarbonated for 8 hrs in a box furnace at 1000 °C. After decarbonation, the temperature was increased to 1300 °C and the samples were left in the furnace overnight to form homogeneous silicate melts.