DOI: 10.1007/s00531-014-1034-5
Scopus记录号: 2-s2.0-84902539312
论文题名: U-Pb geochronology and petrology of the late Paleozoic Gil Marquez pluton: Magmatism in the Variscan suture zone, southern Iberia, during continental collision and the amalgamation of Pangea
作者: Gladney E.R. ; Braid J.A. ; Murphy J.B. ; Quesada C. ; McFarlane C.R.M.
刊名: International Journal of Earth Sciences
ISSN: 14373254
出版年: 2014
卷: 103, 期: 5 起始页码: 1433
结束页码: 1451
语种: 英语
英文关键词: Collisional magmatism
; Gil Marquez pluton
; Sierra Norte Batholith
; Southern Iberia
; U-Pb geochronology
; Variscan suture zone
Scopus关键词: batholith
; continental collision
; deformation
; emplacement
; gabbro
; geochronology
; granite
; Hercynian orogeny
; magmatism
; Paleozoic
; petrology
; pluton
; shear zone
; suture zone
; uranium-lead dating
; Iberian Peninsula
英文摘要: The origin of plutonic complexes that stitch suture zones developed during collision is not well understood. In southern Iberia, the Pulo du Lobo suture zone (PDLZ) is intruded by the syn- to postcollisional Gil Marquez pluton (GMP), thought to be part of the Sierra Norte Batholith. U-Pb (LA-ICPMS, zircon) data on various phases of the GMP yield from oldest to youngest: (1) a 354.4 ± 7.6 Ma unfoliated gabbro; (2) a 345.6 ± 2.5 Ma foliated intermediate phase; (3) a 346.5 ± 5.4 Ma unfoliated porphyritic granite; (4) a 335.1 ± 2.8 Ma unfoliated biotite granite. This sequence is consistent with cross-cutting relationships observed in the field. The range in ages is consistent with interpretations that the GMP is part of the composite (ca. 350-308 Ma) SNB. Inherited ages preserved in the GMP intermediate and felsic phases indicate that its magmas traversed through South Portuguese Zone and PDLZ crust during emplacement. The ca. 345 Ma emplacement of the late kinematic foliated intermediate phase constrains the age of late-stage strike slip deformation within the PDLZ, and the lack of a foliation in the older gabbro indicates that is was not proximal to a shear zone neither at the time of emplacement, nor during its subsequent history. The unfoliated porphyritic granite and unfoliated biotite granite cut the foliation of the intermediate phase indicating emplacement during the waning stages of collision, while the ca. 335 Ma biotite granite intrudes the Santa Ira Flysch, thereby providing a tight constraint for the latest stage of deformation in the PDLZ. © 2014 Springer-Verlag Berlin Heidelberg. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84902539312&doi=10.1007%2fs00531-014-1034-5&partnerID=40&md5=4be68d336793e67601aff7da99c2c60a
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/70369
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, Saint Francis Xavier University, Antigonish, NS, B2G 2W5, Canada; Instituto Geológico y Minero de España, c/Rios Rosas 23, 28003 Madrid, Spain; Department of Earth Sciences, University of New Brunswick, PO Box 4400, Fredericton, NB, E3B 5A3, Canada
Recommended Citation:
Gladney E.R.,Braid J.A.,Murphy J.B.,et al. U-Pb geochronology and petrology of the late Paleozoic Gil Marquez pluton: Magmatism in the Variscan suture zone, southern Iberia, during continental collision and the amalgamation of Pangea[J]. International Journal of Earth Sciences,2014-01-01,103(5)