The Upper Neoproterozoic–Lower Cambrian of the Central Iberian Zone, Spain: chemical and isotopic (Sm-Nd) evidence that the sedimentary succession records an inverted stratigraphy of its source

Ugidos, J. M.; Valladares, M.I.; Barba, Pedro; Ellam, RM

doi:10.1016/s0016-7037(03)00027-9

Cited by 45 publications

(41 citation statements)

References 54 publications

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“…The SGC show relatively wide ranges of initial 87 Sr/ 86 Sr (0.71328-0.80369), as reported by other authors for these metasediments (Ugidos, et al, 2003;Beetsma, 1995, Teixeira, 2008. These values clearly indicate disturbance of the Rb-Sr system.…”

Section: Sr and Nd Isotopic Signaturessupporting

confidence: 83%

LP-HT anatectic processes and lithological heterogeneity in the Mindelo Migmatite Complex (NW Portugal)

Areias¹,

Ribeiro²,

Santos³

et al. 2014

Estud. geol.

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Section: Sr and Nd Isotopic Signaturessupporting

confidence: 83%

LP-HT anatectic processes and lithological heterogeneity in the Mindelo Migmatite Complex (NW Portugal)

Areias¹,

Ribeiro²,

Santos³

et al. 2014

Estud. geol.

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“…Their activity took place between Neoproterozoic (Cadomian-Pan-African cycle) and Early Ordovician times (Murphy and Nance, 2002;Stampfli and Borel, 2002), and they left an imprint in the sedimentological and magmatic record of many of the terranes forming part of the Variscan Belt (Linnemann et , 2007Rodrtguez Alonso et al, 2004;Ugidos et al, 2003). The geochemical features of the metagreywackes of the lower sequence suggest that they were generated in relation to an arc system built on a thinned continental margin, although they also record certain chemical transition to passive margin greywackes.…”

Section: Discussionmentioning

confidence: 99%

“…Only few works have applied so far this methodology in the metasedimentary rocks of the Variscan Belt (Fuenlabada et al, 201 0;linnemann et al, 2004, 2007Ugidos et al, 2003 the margin of Gondwana (Fig. 1 a).…”

Section: Introductionmentioning

confidence: 99%

Sm–Nd isotope geochemistry and tectonic setting of the metasedimentary rocks from the basal allochthonous units of NW Iberia (Variscan suture, Galicia)

Fuenlabrada

Arenas

Fernández

et al. 2012

Lithos

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“…The isotope ratios were calculated at 306 Ma, the age of emplacement. Published representative Sr-Nd isotopic data of shales (Ugidos et al 2003b) are also included in Table 7 for comparison. The ( 87 Sr/ 86 Sr) 306 ratios for amphibole-bearing (0·7067-0·7070) and biotite granites (0·7062-0·7064) are comparable.…”

Section: Sr-nd Isotopesmentioning

confidence: 99%

A reactive assimilation model for regional-scale cordierite-bearing granitoids: geochemical evidence from the Late Variscan granites of the Central Iberian Zone, Spain

Ugidos¹,

Stephens

Carnicero³

et al. 2008

Earth and Environmental Science Transactions of the Royal Socie

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Regional scale biotite and cordierite-bearing granites (s.l.) in the Variscan of the Central Iberian Zone (CIZ) are spatially closely associated with cordierite-rich nebulites and cordierite-bearing two-mica granites, and with cordierite-rich high grade hornfelses and cordieritites (>60% cordierite) that are relatively common in the aureoles of these granites. Building on published field evidence, petrological data are presented which, combined with new chemical and isotopic (Sr-Nd) modelling, indicate that the cordierite-bearing granites cannot be derived by simple anatexis of regional sedimentary protoliths; but the data are consistent with a process of reactive assimilation that involves the interaction of biotite granite magma with high-grade host rocks ranging from cordierite nebulites to andalusite-bearing cordieritites. The contribution of the postulated cordieriterich contaminants to the diversity of cordierite granite compositions is modelled using the compositions of regional Lower Cambrian-Upper Neoproterozoic metasedimentary rocks that are generally chemically mature (CaO very rarely exceeds 1·4%). These rocks include specific horizons in which extreme chemical alteration is attributable to sediment reworking during eustatic falls in sea level. Such compositions may account for the presence of the high concentrations in Al that later produced cordieritites. Fractional crystallisation is also important, particularly in generating the more evolved cordierite granite and cordierite biotite muscovite granite compositions. Although assimilation in situ is normally regarded as a minor contributor volumetrically to evolving plutons, in this instance the emplacement of large volumes of granite magma into a high-T-low-P environment significantly increased the potential for reactive assimilation.

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The Upper Neoproterozoic–Lower Cambrian of the Central Iberian Zone, Spain: chemical and isotopic (Sm-Nd) evidence that the sedimentary succession records an inverted stratigraphy of its source

Cited by 45 publications

References 54 publications

LP-HT anatectic processes and lithological heterogeneity in the Mindelo Migmatite Complex (NW Portugal)

LP-HT anatectic processes and lithological heterogeneity in the Mindelo Migmatite Complex (NW Portugal)

Sm–Nd isotope geochemistry and tectonic setting of the metasedimentary rocks from the basal allochthonous units of NW Iberia (Variscan suture, Galicia)

A reactive assimilation model for regional-scale cordierite-bearing granitoids: geochemical evidence from the Late Variscan granites of the Central Iberian Zone, Spain

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