Intramolecular fractionation of hydrogen isotopes in silicate quenched melts
Intramolecular fractionation of hydrogen isotopes in silicate quenched melts
复制标题
硅酸盐淬火熔体中氢同位素的分子内分馏
DOI：
10.7185/geochemlet.1609
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发表时间：
2016
影响因子：
3.1
通讯作者：
G. Cody
中科院分区：
文献类型：
--
作者：
C. Losq;B. Mysen;G. Cody
1609硅酸盐熔体的化学成分和分子结构之间的相互作用是地壳、地幔和地核演化的中心。这种相互作用也会影响地球化学性质的记录，例如地球内部矿物、熔体和流体之间的同位素分配。例如，在高温高压下，硅酸盐熔体和水相流体之间观察到了很大的2H/1H分馏。这种行为可能由硅酸盐熔体分子结构中2H/1H分子内分馏的发生而促进。新的拉曼光谱和1H、2H核磁共振谱数据揭示了这种2H/1H分子内同位素分馏的来源，表明1H和2H在硅酸盐四面体单元之间发生分馏。这样的过程可能会影响其他同位素体系(如N、C或S)，在这些体系中，同位素与熔体硅酸盐网络相互作用。2015年11月24日收到|2016年1月21日受理|2016年2月16日发布
doi: 10.7185/geochemlet.1609 The interplay between the chemical composition and the molecular structure of silicate melts was central to the evolution of the Earth’s crust, mantle and core. This interplay also affects geochemical records such as the partitioning of isotopes between minerals, melts and fluids in the Earth’s interior. For instance, large 2H/1H fractionations between silicate melts and aqueous fluids have been observed at high temperature and pressure. Such behaviour may be promoted by the occurrence of 2H/1H intramolecular fractionation within the molecular structure of silicate melts. New Raman spectroscopy and 1H and 2H Nuclear Magnetic Resonance (NMR) spectroscopy data reveal the source of such 2H/1H intramolecular isotopic fractionation, showing that 1H and 2H fractionate between the silicate tetrahedral units. Such a process might affect other isotopic systems (e.g., N, C, or S) where the isotopes interact with the melt silicate network. Received 24 November 2015 | Accepted 21 January 2016 | Published 16 February 2016