DOI: 10.1007/s00531-013-0933-1
Scopus记录号: 2-s2.0-84902435822
论文题名: Permian-Carboniferous arc magmatism in southern Mexico: U-Pb dating, trace element and Hf isotopic evidence on zircons of earliest subduction beneath the western margin of Gondwana
作者: Ortega-Obregón C. ; Solari L. ; Gómez-Tuena A. ; Elías-Herrera M. ; Ortega-Gutiérrez F. ; Macías-Romo C.
刊名: International Journal of Earth Sciences
ISSN: 14373254
出版年: 2014
卷: 103, 期: 5 起始页码: 1287
结束页码: 1300
语种: 英语
英文关键词: Lu-Hf zircon isotopes
; Magmatic arc SW México
; Permian-Carboniferous igneous rocks
; U-Pb zircon ages
Scopus关键词: Carboniferous
; continental margin
; felsic rock
; geochronology
; Gondwana
; hafnium
; isotopic composition
; lutetium
; mafic rock
; magmatism
; Permian
; subduction zone
; trace element
; uranium-lead dating
; zircon
; Acatlan Complex
; Central America
; Mexico [North America]
; Oaxaca
英文摘要: Undeformed felsic to mafic igneous rocks, dated by U-Pb zircon geochronology between 311 and 255 Ma, intrude different units of the Oaxacan and Acatlán metamorphic complexes in southwestern Mexico. Rare earth element concentrations on zircons from most of these magmatic rocks have a typical igneous character, with fractionated heavy rare earths and negative Eu anomalies. Only inherited Precambrian zircons are depleted in heavy rare earth elements, which suggest contemporaneous crystallization in equilibrium with metamorphic garnet during granulite facies metamorphism. Hf isotopic signatures are, however, different among these magmatic units. For example, zircons from two of these magmatic units (Cuanana pluton and Honduras batholith) have positive εHf values (+3.8-+8.5) and depleted mantle model ages (using a mean crustal value of 176Lu/177Hf = 0.015) (T DMC) ranging between 756 and 1,057 Ma, whereas zircons from the rest of the magmatic units (Etla granite, Zaniza batholith, Carbonera stock and Sosola rhyolite) have negative εHf values (-1 to -14) and model ages between 1,330 and 2,160 Ma. This suggests either recycling of different crustal sources or, more likely, different extents of crustal contamination of arc-related mafic magmas in which the Oaxacan Complex acted as the main contaminant. These plutons thus represent the magmatic expression of the initial stages of eastward subduction of the Pacific plate beneath the western margin of Gondwana, and confirm the existence of a Late Carboniferous-Permian magmatic arc that extended from southern North America to Central America. © 2013 Springer-Verlag Berlin Heidelberg. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84902435822&doi=10.1007%2fs00531-013-0933-1&partnerID=40&md5=2aa3e59d9dcd003d2c97fb6f9b1e32e7
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/70434
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: Centro de Geociencias, UNAM, Campus Juriquilla, Querétaro, Mexico; Instituto de Geología, UNAM, Ciudad Universitaria, Distrito Federal, Mexico
Recommended Citation:
Ortega-Obregón C.,Solari L.,Gómez-Tuena A.,et al. Permian-Carboniferous arc magmatism in southern Mexico: U-Pb dating, trace element and Hf isotopic evidence on zircons of earliest subduction beneath the western margin of Gondwana[J]. International Journal of Earth Sciences,2014-01-01,103(5)