气候变化领域集成服务门户(CCPortal): Geochemical and isotopic (Sm–Nd) provenance of Ediacaran-Cambrian metasedimentary series from the Iberian Massif. Paleoreconstruction of the North Gondwana margin

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DOI	10.1016/j.earscirev.2019.103079
	Geochemical and isotopic (Sm–Nd) provenance of Ediacaran-Cambrian metasedimentary series from the Iberian Massif. Paleoreconstruction of the North Gondwana margin
	Fuenlabrada J.M.; Arenas R.; Sánchez Martínez S.; Díez Fernández R.; Pieren A.P.; Pereira M.F.; Chichorro M.; Silva J.B.
发表日期	2020
ISSN	0012-8779
卷号	201
英文摘要	The geochemical and isotopic (Sm–Nd) features of the Ediacaran-Cambrian siliciclastic series from the Central Iberian Zone and the Iberian Allochthonous Domains indicate a significant paleogeographic change at the northern margin of Gondwana, associated with the development of the Avalonian-Cadomian arc. During the Neoproterozoic, the opening of a peri-Gondwanan back-arc basin and its subsequent widening during the Cambrian led to a progressive separation of the sedimentary basins from the main focus of the probably waning Cadomian magmatic arc activity. This work presents a paleogeographic reconstruction of the distribution of the Iberian terranes along the North Gondwanan margin during Ediacaran and Cambrian times, based on the geochemical and Nd-isotope data from the Iberian Allochthonous and Autochthonous Domains. These results suggest a location close to the West Africa Craton for both the allochthonous and autochthonous terranes, but they would be distributed laterally along the northern margin of Gondwana, occupying arc- or continental-ward positions within a wide back-arc basin. In this context, the peri-Gondwanan volcanic arc acted as the main supplier of the abundant juvenile material, as reflected in positive values of εNd and young TDM model ages (720–1215 Ma) of the Middle Cambrian siliciclastic series from NW Iberia Upper Allochthonous Units. On the other hand, the rather equivalent geochemical and isotopic features of the sedimentary series of the NW and SW Iberia Basal Allochthonous Units suggest a common paleolocation for those series, yet within the back-arc basin but closer to the mainland and older isotope sources. The sedimentary series of these terranes present the oldest TDM ages (1499–2156 Ma), clearly greater than the TDM ages that characterize coeval sedimentary series of the Iberian Autochthonous Domain (1256–1334 Ma). This finding allows us to place Iberian Basal Allochthonous Units very close to the West Africa Craton, from where they received a dominant contribution of old crustal materials, whereas the Iberian Autochthonous Domain occupied a more eastern paleoposition closer to the Sahara Metacraton. © 2019 Elsevier B.V.
英文关键词	Autochthonous domain and allochthonous units; Avalonian-Cadomian active margin; Ediacaran-Cambrian metasedimentary series; Gondwana paleogeography; Iberian Massif; Sm-Nd isotope geochemistry
语种	英语
scopus关键词	active margin; Cambrian; Ediacaran; geochemistry; Gondwana; isotopic composition; metasediment; neodymium isotope; paleogeography; reconstruction; samarium; Iberian Massif
来源期刊	EARTH-SCIENCE REVIEWS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/209708
作者单位	Unidad de Geocronología (CAI de Ciencias de la Tierra y Arqueometría), Universidad Complutense de Madrid, Madrid, 28040, Spain; Departamento de Mineralogía y Petrología, Facultad de Geología, Universidad Complutense de Madrid, Madrid, 28040, Spain; Departamento de Geodinámica, Estratigrafía y Paleontología, Facultad de Geología, Universidad Complutense de Madrid, Madrid, 28040, Spain; ICT, Departamento de Geociȇncias, Universidade de Évora, Évora, 7001-554, Portugal; GeoBioTec/Departamento de Ciências da Terra, Universidade Nova de Lisboa, Lisbon, Portugal; IDL/Departamento de Geologia, Faculdade de Ciências, Universidade de Lisboa, Lisbon, Portugal
推荐引用方式 GB/T 7714	Fuenlabrada J.M.,Arenas R.,Sánchez Martínez S.,等. Geochemical and isotopic (Sm–Nd) provenance of Ediacaran-Cambrian metasedimentary series from the Iberian Massif. Paleoreconstruction of the North Gondwana margin[J],2020,201.
APA	Fuenlabrada J.M..,Arenas R..,Sánchez Martínez S..,Díez Fernández R..,Pieren A.P..,...&Silva J.B..(2020).Geochemical and isotopic (Sm–Nd) provenance of Ediacaran-Cambrian metasedimentary series from the Iberian Massif. Paleoreconstruction of the North Gondwana margin.EARTH-SCIENCE REVIEWS,201.
MLA	Fuenlabrada J.M.,et al."Geochemical and isotopic (Sm–Nd) provenance of Ediacaran-Cambrian metasedimentary series from the Iberian Massif. Paleoreconstruction of the North Gondwana margin".EARTH-SCIENCE REVIEWS 201(2020).