Hydrogen diffusion in clinopyroxene: dehydration experiments

• 作 者: 夏群科 陈道公 S.Carpenter 支霞臣 王汝成 程昊
• 机 构: Department of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026,
• 出 处: Science in China(Series D:Earth Sciences)
• 发表日期: 2000年06期
• 关键词: dehydration Hydrogen sequential mantle alkali isotope eastern heating magma poss

Hydrogen diffusivity of one Clinopyroxene megacryst from Nushan, eastern China parallel to [001]* crystallographic direction was measured by high-temperature sequential dehydration experiments at 950℃ and 850℃, which was (6.5±1.5)×10 12(m2/s) and (1.8±0.7)×10 12(m2/s) respectively. From these results and the previous published data, it seems that the correlation between hydrogen diffusivity and Fe content suggested by Dyar et al. (1996) possibly does not exist. Clinopyroxene megacrysts from alkali basalts appear to be possible reliable samples for the study of the water evolution and hydrogen isotope compositions of the upper mantle.

Hydrogen diffusivity of one Clinopyroxene megacryst from Nushan, eastern China parallel to [001] * crystallographic direction was measured by high-temperature sequential dehydration experiments at 950 ° C and 850 ° C, which was (6.5 ± 1.5) × 10 12 (m2 / s) and (1.8 ± 0.7) × 10 12 (m2 / s) respectively. From these results and the previous published data, it seems that the correlation between hydrogen diffusivity and Fe content suggested by Dyar et al. (1996) possibly does not exist. Clinopyroxene megacrysts from alkali basalts appear to be possible reliable samples for the study of the water evolution and hydrogen isotope compositions of the upper mantle.