气候变化领域集成服务门户(CCPortal): The Carbonate Geochemistry of Enceladus' Ocean

CCPortal

DOI	10.1029/2019GL085885
	The Carbonate Geochemistry of Enceladus' Ocean
	Glein C.R.; Waite J.H.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:3
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.
英文关键词	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
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/170748
作者单位	Space Science and Engineering Division, Southwest Research Institute, San Antonio, TX, United States
推荐引用方式 GB/T 7714	Glein C.R.,Waite J.H.. The Carbonate Geochemistry of Enceladus' Ocean[J],2020,47(3).
APA	Glein C.R.,&Waite J.H..(2020).The Carbonate Geochemistry of Enceladus' Ocean.Geophysical Research Letters,47(3).
MLA	Glein C.R.,et al."The Carbonate Geochemistry of Enceladus' Ocean".Geophysical Research Letters 47.3(2020).