DOI: 10.1007/s00531-012-0788-x
论文题名: U-Pb Zircon geochronology of the Cambro-Ordovician metagranites and metavolcanic rocks of central and NW Iberia
作者: Talavera C. ; Montero P. ; Bea F. ; González Lodeiro F. ; Whitehouse M.
刊名: International Journal of Earth Sciences
出版年: 2013
卷: 102, 期: 1 起始页码: 1
结束页码: 23
语种: 英语
英文关键词: Cambro-Ordovician
; Magmatism
; U-Pb dating
; Zircon
Scopus关键词: age determination
; Cambrian
; crystallization
; geochronology
; granite
; isotopic composition
; magmatism
; metagreywacke
; metavolcanic rock
; Ordovician
; partial melting
; uranium-lead dating
; zircon
; Castilla y Leon
; Central Iberian Zone
; Galicia [Spain]
; Salamanca [Castilla y Leon]
; Spain
英文摘要: New U-Pb zircon data from metagranites and metavolcanic rocks of the Schist-Graywacke Complex Domain and the Schistose Domain of Galicia Tras-os-Montes Zone from central and NW Iberia contribute to constrain the timing of the Cambro-Ordovician magmatism from Central Iberian and Galicia Tras-os-Montes Zones which occurred between 498 and 462 Ma. The crystallization ages of the metagranites and metavolcanic rocks from the northern Schist-Graywacke Complex Domain are as follows: (a) in west Salamanca, 489 ± 5 Ma for Vitigudino, 486 ± 6 Ma for Fermoselle and 471 ± 7 Ma for Ledesma; (b) in northern Gredos, 498 ± 4 Ma for Castellanos, 492 ± 4 Ma for San Pelayo and 488 ± 3 Ma for Bercimuelle; (c) in Guadarrama, 490 ± 5 Ma for La Estación I, 489 ± 9 Ma for La Cañada, 484 ± 6 Ma for Vegas de Matute (leucocratic), 483 ± 6 Ma for El Cardoso, 482 ± 8 Ma for La Morcuera, 481 ± 9 Ma for Buitrago de Lozoya, 478 ± 7 Ma for La Hoya, 476 ± 5 Ma for Vegas de Matute (melanocratic), 475 ± 5 Ma for Riaza, 473 ± 8 Ma for La Estación II and 462 ± 11 Ma for La Berzosa; and (d) in Toledo, 489 ± 7 Ma for Mohares and 480 ± 8 Ma for Polán. The crystallization ages of the metagranites from the Schistose Domain of Galicia Tras-os-Montes Zone are 497 ± 6 Ma for Laxe, 486 ± 8 Ma for San Mamede, 482 ± 7 Ma for Bangueses, 481 ± 5 Ma for Noia, 480 ± 10 for Rial de Sabucedo, 476 ± 9 Ma for Vilanova, 475 ± 6 Ma for Pontevedra, 470 ± 6 Ma for Cherpa and 462 ± 8 Ma for Bande. This magmatism is characterized by an average isotopic composition of (87Sr/86Sr)485Ma ≈ 0.712, (εNd)485Ma ≈ -4.1 and (TDM) ≈ 1. 62 Ga, and a high zircon inheritance, composed of Ediacaran-Early Cambrian (65 %) and, to a lesser extent, Cryogenian, Tonian, Mesoproterozoic, Orosirian and Archean pre-magmatic cores. Combining our geochronological and isotopic data with others of similar rocks from the European Variscan Belt, it may be deduced that Cambro-Ordovician magmas from this belt were mainly generated by partial melting of Ediacaran-Early Cambrian igneous rocks. © 2012 Springer-Verlag. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84872343589&doi=10.1007%2fs00531-012-0788-x&partnerID=40&md5=e65200e7b8984cfb12e421152a80fe3e
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/70575
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 Mineralogy and Petrology, Campus Fuentenueva, University of Granada, 18002 Granada, Spain; Research School of Earth Sciences, Australian National University, ACT, ACT, 0200, Australia; Department of Geodynamics, Campus Fuentenueva, University of Granada, 18002 Granada, Spain; Swedish Museum of Natural History, Box 50007, 104 05 Stockholm, Sweden
Recommended Citation:
Talavera C.,Montero P.,Bea F.,et al. U-Pb Zircon geochronology of the Cambro-Ordovician metagranites and metavolcanic rocks of central and NW Iberia[J]. International Journal of Earth Sciences,2013-01-01,102(1)