气候变化领域集成服务门户(CCPortal): Tectonically assisted exhumation and cooling of Variscan granites in an anatectic complex of the Central Iberian Zone; Portugal: constraints from LA-ICP-MS zircon and apatite U

CCPortal

DOI	10.1007/s00531-019-01755-1
	Tectonically assisted exhumation and cooling of Variscan granites in an anatectic complex of the Central Iberian Zone; Portugal: constraints from LA-ICP-MS zircon and apatite U–Pb ages
	Ferreira J.A.; Bento dos Santos T.; Pereira I.; Mata J.
发表日期	2019
ISSN	14373254
起始页码	2153
结束页码	2175
卷号	108 期号:7
英文摘要	Understanding the exhumation of middle to lower crustal rocks is of utmost importance to unravel intracrustal mass transfer processes during orogenic build-up. The Figueira de Castelo Rodrigo–Lumbrales Anatectic Complex (FCR–LAC) is located within the autochthonous terrane of the Variscan Central Iberian Zone and is an example of the association between S-type granites and migmatites. The anatectic complex contacts to the north and south with low-grade metamorphic units through the Huebra and Juzbado–Penalva do Castelo shear zones, respectively. Integration of new U–Pb zircon and apatite age data allowed us to obtain Variscan crystallization ages, inherited zircon ages and unprecedented cooling rates for different facies of the FCR–LAC granites. The zircon crystallization ages mostly cluster around 313–317 Ma for the syn-tectonic granites, whereas the dated late-tectonic granite provided an age of 300 Ma. The cooling rates range from 13 to 35 °C Ma−1, which implies fast exhumation (0.3–0.84 mm a−1) and shallow emplacement (ca. 8 km deep), compatible with exhumation facilitated by large crustal-scale shear zones. Inherited zircon in the granites reveals melting of Cadomian metasediments (650–550 Ma), Upper Cambrian–Lower Ordovician (495–470 Ma) metaigneous rocks (Ollo de Sapo formation) and of minor older components, suggesting protolith affinity with the Northern Domain of the Central Iberian Zone. © 2019, Geologische Vereinigung e.V. (GV).
英文关键词	Cooling rates; Exhumation rates; Iberian Variscan Orogeny; Syn-tectonic granites; U–Pb geochronology
语种	英语
scopus关键词	age determination; apatite; cooling; emplacement; exhumation; geochronology; granite; Hercynian orogeny; inductively coupled plasma method; low grade metamorphism; uranium-lead dating; zircon; Central Iberian Zone
来源期刊	International Journal of Earth Sciences
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/147789
作者单位	IDL-Instituto Dom Luiz, Faculdade de Ciências, Universidade de Lisboa, Campo Grande, Lisbon, 1749-016, Portugal; School of Earth and Environmental Sciences, University of Portsmouth, Building Burnaby Rd, Portsmouth, P01 3QL, United Kingdom
推荐引用方式 GB/T 7714	Ferreira J.A.,Bento dos Santos T.,Pereira I.,等. Tectonically assisted exhumation and cooling of Variscan granites in an anatectic complex of the Central Iberian Zone; Portugal: constraints from LA-ICP-MS zircon and apatite U–Pb ages[J],2019,108(7).
APA	Ferreira J.A.,Bento dos Santos T.,Pereira I.,&Mata J..(2019).Tectonically assisted exhumation and cooling of Variscan granites in an anatectic complex of the Central Iberian Zone; Portugal: constraints from LA-ICP-MS zircon and apatite U–Pb ages.International Journal of Earth Sciences,108(7).
MLA	Ferreira J.A.,et al."Tectonically assisted exhumation and cooling of Variscan granites in an anatectic complex of the Central Iberian Zone; Portugal: constraints from LA-ICP-MS zircon and apatite U–Pb ages".International Journal of Earth Sciences 108.7(2019).