DOI: 10.1007/s00531-014-1012-y
Scopus记录号: 2-s2.0-84902548002
论文题名: Changing mantle sources in a suture zone in the heart of Pangea: Implications for collisional tectonics during the waning stages of ocean closure
作者: Dupuis N.E. ; Braid J.A. ; Murphy J.B. ; Quesada C. ; McFarlane C.
刊名: International Journal of Earth Sciences
ISSN: 14373254
出版年: 2014
卷: 103, 期: 5 起始页码: 1403
结束页码: 1414
语种: 英语
英文关键词: Geochronology
; Gondwana
; Isotopes
; Laurussia
; Mafic dykes
; Variscan
Scopus关键词: continental collision
; dike
; emplacement
; geochronology
; Gondwana
; Hercynian orogeny
; isotopic analysis
; mafic rock
; mantle source
; melange
; metasedimentary rock
; ophiolite
; Paleozoic
; suture zone
; tectonic setting
; Iberian Peninsula
英文摘要: The formation and emplacement of syn-collisional mafic dykes that intrude suture zones and their association with orogenic processes are enigmatic. Southern Iberia records the Late Paleozoic amalgamation of Pangea and exposes today a fragment of Laurussia (South Portuguese Zone), which is spatially juxtaposed with autochthonous Gondwana. Fault-bounded oceanic metasedimentary rocks, mélanges and ophiolite complexes characterize the suture zone and are in turn crosscut by intrusive granitoid rocks and mafic dykes. The generation and emplacement of these mafic dykes and their relationship to the suture zone are undetermined. Field evidence shows the dykes were emplaced at high angles to pre-existing orogenic fabrics in the mélange, granitoid and metasedimentary rocks. Geochemical analyses (major, trace, rare earth elements) indicate the dykes exhibit a mid-ocean ridge basalt signature. U/Pb zircon geochronology reveals the crystallization age of the dykes is ca. 316 Ma and Sm-Nd isotopic analysis suggests a deep mantle source. Taken together, these data support existing temporal constraints on events leading up to the amalgamation of Pangea, and suggest progressive lower crustal delamination during the waning stages of continent-continent collision. © 2014 Springer-Verlag Berlin Heidelberg. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84902548002&doi=10.1007%2fs00531-014-1012-y&partnerID=40&md5=785ab4dd69272f26a94c583c178b5c26
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/70341
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Department of Earth Sciences, St. Francis Xavier University, P.O. Box 5000, Antigonish, NS, B2G 2W5, Canada; Instituto Geológico y Minero de España, C/Ríos Rosas 23, 28003 Madrid, Spain; Department of Earth Sciences, University of New Brunswick, Fredericton, NB, E3B 5A3, Canada
Recommended Citation:
Dupuis N.E.,Braid J.A.,Murphy J.B.,et al. Changing mantle sources in a suture zone in the heart of Pangea: Implications for collisional tectonics during the waning stages of ocean closure[J]. International Journal of Earth Sciences,2014-01-01,103(5)