| DOI: | 10.1029/2019GL085885
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| 论文题名: | The Carbonate Geochemistry of Enceladus' Ocean |
| 作者: | Glein C.R.; Waite J.H.
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| 刊名: | Geophysical Research Letters
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| ISSN: | 948276
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| 出版年: | 2020
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| 卷: | 47, 期:3 | | 语种: | 英语
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| 英文关键词: | carbonation
; extraterrestrial oceanography
; habitability
; ocean world
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| Scopus关键词: | Carbon dioxide
; Geochemistry
; Iron oxides
; Magnesia
; Mass spectrometry
; Reaction intermediates
; Silica
; Geochemical interpretation
; habitability
; Heterogeneous structures
; Intermediate regimes
; Mass spectrometry data
; ocean world
; Plume composition
; Reaction path modeling
; Carbonation
; buffering
; carbonate group
; carbonate system
; data set
; Enceladus
; geochemistry
; global ocean
; long-term change
; mass spectrometry
; oceanography
; plume
; seafloor
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| 英文摘要: | The plume composition at Enceladus contains clues about conditions and processes in the interior. We present new geochemical interpretations of Cassini mass spectrometry data from the plume gas and salt-rich ice grains. It is found that self-consistency between the data sets can be achieved with a derived range of 10−4.6 to 10−3.2 for the activity of CO2 in Enceladus' ocean. This range is compatible with long-term buffering by reduced or oxidized seafloor rocks containing quartz, talc, and carbonate minerals in the MgO–FeO–SiO2–CO2–H2O system. Reaction path modeling shows that these types of rocks can be produced from accreted CO2-rich fluids reacting with hydrous chondritic rocks over an intermediate regime of carbonation. These results, together with previous findings of silica and H2 at Enceladus, support the hypothesis of a heterogeneous structure for the rocky core (carbonated upper layer, serpentinized interior), which provides a geochemical gradient for habitability. ©2020. American Geophysical Union. All Rights Reserved. |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/159266
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| Appears in Collections: | 气候变化与战略
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作者单位: | Space Science and Engineering Division, Southwest Research Institute, San Antonio, TX, United States
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| Recommended Citation: | |
Glein C.R.,Waite J.H.. The Carbonate Geochemistry of Enceladus' Ocean[J]. Geophysical Research Letters,2020-01-01,47(3)
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