Stable hydrogen isotopes in iron oxides—II. DH variations among natural goethites
Stable hydrogen isotopes in iron oxides—II. DH variations among natural goethites
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氧化铁中的稳定氢同位素——II 天然针铁矿的 DH 变化
DOI：
10.1016/0016-7037(85)90040-7
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发表时间：
1985
影响因子：
5
通讯作者：
M. Pedley
中科院分区：
文献类型：
--
作者：
C. Yapp;M. Pedley
本研究分析的针铁矿样品的 δD 范围为每密耳− 202 至− 98，伴生水的相应 δD 范围为每密耳− 110 至+ 7。具有最大正 δD 值的针铁矿来自海洋环境。该实验室在 100°C 和 145°C 下测量的针铁矿-水平衡 D H 分馏因子以及根据天然样品数据估计的沉积温度在所有三个温度下的值约为 0.900。这些数据表明，针铁矿 δD 值可能是针铁矿最后平衡的水的 δD 值的直接、与温度无关的测量值。本研究中的大多数针铁矿 δD 值反映了原产地现代水域的 δD 值。用 Mn 和/或 Al 替代针铁矿结构中的 Fe 可能会影响矿泉水分馏因子。锰似乎会降低 α 值。 Al 取代对 α 的影响尚未测量，但初步证据表明增加 Al 含量可以增加 α 值。
Goethite samples analyzed for this study have a δD range from− 202 to− 98 per mil with a corresponding δD range of associated waters from about− 110 to+ 7 per mil. Goethites with the most positive δD values are from marine environments. Goethite-water equilibrium D H fractionation factors measured in this laboratory at 100° C and 145° C and estimated for sedimentary temperatures from data on natural samples have values of about 0.900 at all three temperatures. These data suggest that goethite δD values may be a direct, temperature-independent measure of the δD values of the waters with which the goethite last equilibrated. Most of the goethite δD values in this study reflect the δD values of the modern waters in the locales of origin. Substitution of Mn and/or Al for Fe in the goethite structure may affect the mineral-water fractionation factor. Manganese appears to decrease the value of α. The effect of Al substitution on α has not yet been measured, but preliminary arguments suggest that increasing Al content could increase α values.