globalchange  > 影响、适应和脆弱性
DOI: 10.1007/s00531-013-0939-8
Scopus记录号: 2-s2.0-84902517089
论文题名:
Early Cambrian granitoids of North Gondwana margin in the transition from a convergent setting to intra-continental rifting (Ossa-Morena Zone, SW Iberia)
作者: Sánchez-García T.; Pereira M.F.; Bellido F.; Chichorro M.; Silva J.B.; Valverde-Vaquero P.; Pin C.; Solá A.R.
刊名: International Journal of Earth Sciences
ISSN: 14373254
出版年: 2014
卷: 103, 期:5
起始页码: 1203
结束页码: 1218
语种: 英语
英文关键词: Early Cambrian granitoids ; ID-TIMS zircon U-Pb geochronology ; North Gondwana magmatism ; Ossa-Morena Zone ; Sm-Nd and Rb-Sr isotopes ; Whole-rock geochemistry
Scopus关键词: Cambrian ; convergent margin ; emplacement ; geochemistry ; geochronology ; Gondwana ; granitoid ; isotopic composition ; magmatism ; mass spectrometry ; rifting ; tectonic setting ; uranium-lead dating ; zircon ; Iberian Peninsula ; Ossa Morena Zone
英文摘要: Two distinct Cambrian magmatic pulses are recognized in the Ossa-Morena Zone (SW Iberia): an early rift-(ER) and a main rift-related event. This Cambrian magmatism is related to intra-continental rifting of North Gondwana that is thought to have culminated in the opening of the Rheic Ocean in Lower Ordovician times. New data of whole-rock geochemistry (19 samples), Sm-Nd-Sr isotopes (4 samples) and ID-TIMS U-Pb zircon geochronology (1 sample) of the Early Cambrian ER plutonic rocks of the Ossa-Morena Zone are presented in this contribution. The ER granitoids (Barreiros, Barquete, Calera, Salvatierra de los Barros and Tablada granitoid Massifs) are mostly peraluminous granites. The Sm-Nd isotopic data show moderate negative εNdt values ranging from -3.5 to +0.1 and TDM ages greatly in excess of emplacement ages. Most ER granitoids are crustal melts. However, a subset of samples shows a transitional anorogenic alkaline tendency, together with more primitive isotopic signatures, documenting the participation of lower crust or mantle-derived sources and suggesting a local transient advanced stage of rifting. The Barreiros granitoid is intrusive into the Ediacaran basement of the Ossa-Morena Zone (Série Negra succession) and has yielded a crystallization age of 524.7 ± 0.8 Ma consistent with other ages of ER magmatic pulse. This age: (1) constrains the age of the metamorphism developed in the Ediacaran back-arc basins before the intrusion of granites and (2) defines the time of the transition from the Ediacaran convergent setting to the Lower Cambrian intra-continental rifting in North Gondwana. © 2013 Springer-Verlag Berlin Heidelberg.
URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84902517089&doi=10.1007%2fs00531-013-0939-8&partnerID=40&md5=1807d57d54371cbc33c7c76ae2df2fe1
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/70465
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: IGME, C/Ríos Rosas, 23, 28003 Madrid, Spain; IDL, Departamento Geociências, ECT, Univ. Évora, Apt.94, 7001-554 Évora, Portugal; CICEGe, FCT, Universidade Nova de Lisboa, Quinta da Torre, 2829-516 Caparica, Portugal; IDL, Departamento Geologia, FCUL, Universidade de Lisboa, Lisboa, Portugal; IGME, C/Calera, s/n, 28760 Tres Cantos, Spain; Département Géologie, CNRS, Univ. Blaise Pascal, Rue Kessler, 63038 Clermont-Ferrand, France; LNEG, Apartado 7586- Alfragide, 2610-999 Amadora, Portugal

Recommended Citation:
Sánchez-García T.,Pereira M.F.,Bellido F.,et al. Early Cambrian granitoids of North Gondwana margin in the transition from a convergent setting to intra-continental rifting (Ossa-Morena Zone, SW Iberia)[J]. International Journal of Earth Sciences,2014-01-01,103(5)
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