DOI: 10.1002/grl.50988
论文题名: Effects of lunar cumulate mantle overturn and megaregolith on the expansion and contraction history of the Moon
作者: Zhang N. ; Parmentier E.M. ; Liang Y.
刊名: Geophysical Research Letters
ISSN: 0094-8482
EISSN: 1944-8213
出版年: 2013
卷: 40, 期: 19 起始页码: 5019
结束页码: 5023
语种: 英语
英文关键词: lunar megaregolith
; lunar overturn
; volume change of the Moon
Scopus关键词: Density stratification
; Expansion and contraction
; Heat-producing elements
; Low thermal conductivity
; lunar megaregolith
; lunar overturn
; Thermochemical mantle
; Volume change
; Expansion
; Faulting
; Moon
; core-mantle boundary
; gravity anomaly
; ilmenite
; lunar crust
; lunar mantle
; regolith
; solidification
; thermal conductivity
; thermochemistry
; thrust fault
英文摘要: Gravity anomalies derived from recent Gravity Recovery and Interior Laboratory data suggest the presence of early volume expansion of the Moon. The absence of identifiable thrust faults limits the total net contraction that has occurred. These observations provide constraints on the lunar thermal evolution which raise questions for giant impact origin of the Moon. To study the lunar expansion/contraction history, we perform 3-D thermochemical mantle evolution models, with solidifying core overlain by a layer of ilmenite-bearing cumulates (IBCs) resulting from mantle overturn after magma ocean solidification. Our models focus on the effects of the overturn-produced density stratification with a deep heat-producing element (HPE) distribution and a top insulating megaregolith layer. The deep HPE can cause an early expansion up to 1.5 km radius due to the heating of thedeep mantle. This HPE distribution also reduces the present-day contraction by ∼7 km. Compared to the models without overturn, an end-member model with a stable IBC-rich layer on the core-mantle boundary shows an overall present-day contraction as small as 1.1 km. The low thermal conductivity of megaregolith also affects the present-day contraction, reducing it by ∼3 km. Key Points Lunar volume contraction is reduced by deep heat source distribution Lunar overturn-induced thermal evolution causes early expansion Lunar megaregolith helps reducing lunar volume contraction ©2013. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84884928794&doi=10.1002%2fgrl.50988&partnerID=40&md5=d192224d94b6e66c14e67d1e4556a46a
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/5746
Appears in Collections: 气候减缓与适应
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作者单位: Department of Geological Science, Brown University, 324 Brook St., Providence, RI 02912, United States
Recommended Citation:
Zhang N.,Parmentier E.M.,Liang Y.. Effects of lunar cumulate mantle overturn and megaregolith on the expansion and contraction history of the Moon[J]. Geophysical Research Letters,2013-01-01,40(19).