DOI: 10.1002/2016GL067729
论文题名: How sharp is the sharp Archean Moho? Example from eastern Superior Province
作者: Levin V. ; VanTongeren J.A. ; Servali A.
刊名: Geophysical Research Letters
ISSN: 0094-9286
EISSN: 1944-9017
出版年: 2016
卷: 43, 期: 5 起始页码: 1928
结束页码: 1933
语种: 英语
英文关键词: craton
; Moho
; receiver function
Scopus关键词: Seismology
; Craton
; Crustal thickness
; Gravitational instability
; Internal deformation
; Moho
; Potential temperature
; Receiver functions
; Seismic properties
; Structural geology
英文摘要: The Superior Province of North America has not experienced major internal deformation for nearly 2.8 Gyr, preserving the Archean crust in its likely original state. We present seismological evidence for a sharp (less than 1 km) crust-mantle boundary beneath three distinct Archean terranes and for a more vertically extensive boundary at sites likely affected by the 1.2-0.9 Ga Grenville orogeny. At all sites crustal thickness is smaller than expected for the primary crust produced by melting under higher mantle potential temperature conditions of Archean time. Reduced thickness and an abrupt contrast in seismic properties at the base of the undisturbed Archean crust are consistent with density sorting and loss of the residues through gravitational instability facilitated by higher temperatures in the upper mantle at the time of formation. Similar sharpness of crust-mantle boundary in disparate Archean terranes suggests that it is a universal feature of the Archean crustal evolution. © 2016. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84960411523&doi=10.1002%2f2016GL067729&partnerID=40&md5=8049ef04610e18b7c8b4f7ce25169d21
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/10249
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: Department of Earth and Planetary Sciences, State University of New Jersey Rutgers, New Brunswick, New Jersey, United States
Recommended Citation:
Levin V.,VanTongeren J.A.,Servali A.. How sharp is the sharp Archean Moho? Example from eastern Superior Province[J]. Geophysical Research Letters,2016-01-01,43(5).