DOI: 10.1002/grl.50761
论文题名: Crustal evolution across the southern Appalachians: Initial results from the SESAME broadband array
作者: Parker E.H. ; Hawman R.B. ; Fischer K.M. ; Wagner L.S.
刊名: Geophysical Research Letters
ISSN: 0094-8734
EISSN: 1944-8465
出版年: 2013
卷: 40, 期: 15 起始页码: 3853
结束页码: 3857
语种: 英语
英文关键词: crustal root
; lower crust
; receiver functions
; southern Appalachians
Scopus关键词: Average composition
; Broadband deployment
; Continental collisions
; Crustal evolution
; crustal root
; Lower crust
; Receiver functions
; Southern appalachians
; Structural geology
; Tectonics
; Loading
; broadband data
; collision
; crustal evolution
; crustal thickness
; loading
; orogeny
; thrust
; Appalachians
英文摘要: Receiver functions from the EarthScope Southeastern Suture of the Appalachian Margin Experiment broadband deployment and U.S. Transportable Array were analyzed to constrain average crustal thickness and composition across the southern Appalachians. Low Vp/Vs ratios (1.69-1.72) across the Carolina terrane and parts of the Inner Piedmont indicate that the crust has a felsic average composition. The results are consistent with models of thin-skinned thrusting of Carolina arc fragments over Laurentian basement, whereas arc collision models require significant crustal modification to explain the low Vp/Vs. New crustal thickness estimates provide constraints on the extent of the Blue Ridge crustal root. The present root may be a remnant of a broader structure formed by Alleghanian thrust loading. Root preservation is attributed to Mesozoic heating and thinning of the lower crust beneath outboard terranes, leaving colder Blue Ridge crust largely intact. However, thickened crust (50-55 km) across the region may also be inherited from continental collision during the Proterozoic Grenville orogeny. © 2013. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84881183065&doi=10.1002%2fgrl.50761&partnerID=40&md5=12b0e955584139c008f7335e3e39951c
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/5998
Appears in Collections: 气候减缓与适应
There are no files associated with this item.
作者单位: Department of Geology, University of Georgia, 210 Field St., Athens, GA 30602, United States
Recommended Citation:
Parker E.H.,Hawman R.B.,Fischer K.M.,et al. Crustal evolution across the southern Appalachians: Initial results from the SESAME broadband array[J]. Geophysical Research Letters,2013-01-01,40(15).