DOI: 10.1002/2015GL066375
论文题名: Geochemistry, thermal evolution, and cryovolcanism on Ceres with a muddy ice mantle
作者: Neveu M. ; Desch S.J.
刊名: Geophysical Research Letters
ISSN: 0094-8376
EISSN: 1944-8107
出版年: 2015
卷: 42, 期: 23 起始页码: 10197
结束页码: 10206
语种: 英语
英文关键词: Ceres
; cryovolcanism
; geochemistry
; muddy ice
; thermal evolution
Scopus关键词: Brines
; Freezing
; Geochemistry
; Liquids
; Minerals
; Reservoirs (water)
; Aqueous alteration
; Ceres
; Core-mantle boundary
; Cryovolcanism
; Geochemical simulation
; Surface expression
; Surface mineralogy
; Thermal evolution
; Ice
; core-mantle boundary
; cryosphere
; freezing
; geochemistry
; mineralogy
; thermal evolution
; volcanism
; Ceres
英文摘要: We present a model of the internal evolution of Ceres consistent with pre-Dawn observations and preliminary data returned by Dawn. We assume that Ceres accreted ice and both micron- and millimeter-sized rock particles and that micron-sized fines stayed suspended in liquid during differentiation. We conclude that aqueously altered grains were emplaced on Ceres's surface during the first tens of megayears of its evolution. Our geochemical simulations suggest that Ceres's unusual surface mineralogy is consistent with aqueous alteration of CM material, possibly by NH3-bearing fluid. Thermal evolution simulations including insulating fines yield present-day liquid at depth if Ceres has a small core or no core at all; otherwise, they yield temperatures at the core-mantle boundary of 240-250 K, just warm enough for chloride brines to persist and be freezing today. We hypothesize that ongoing freezing may overpressurize liquid or briny reservoirs, driving cryovolcanic outflow whose surface expression may have been observed by Dawn at Ceres's "bright spots." These outflows may contribute to the water vapor being produced at Ceres. © 2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84953639426&doi=10.1002%2f2015GL066375&partnerID=40&md5=c658ceaa017446c38c09bd839e4b8d87
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/7992
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: School of Earth and Space Exploration, Arizona State University, Tempe, AZ, United States
Recommended Citation:
Neveu M.,Desch S.J.. Geochemistry, thermal evolution, and cryovolcanism on Ceres with a muddy ice mantle[J]. Geophysical Research Letters,2015-01-01,42(23).