The Cambrian to Devonian odyssey of the Brabant Massif within Avalonia: A review with new zircon ages, geochemistry, Sm–Nd isotopes, stratigraphy and palaeogeography

Linnemann, Ulf; Herbosch, Alain; Liégeois, Jean-Paul; Pin, Christian; Gärtner, Andreas; Hofmann, Mandy

doi:10.1016/j.earscirev.2012.02.007

Cited by 103 publications

(90 citation statements)

References 66 publications

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“…In formed on the margin of West Avalonia. Some would place the Meguma terrane adjacent to the Amazonian craton (e.g., Keppie 1977;Linnemann et al 2012), and others closer to the West African craton (e.g., Schenk 1997;Waldron et al 2009). …”

Section: Relationship To the Welsh Basinmentioning

confidence: 99%

“…These data were interpreted by Greenough et al (1999) to suggest that the Meguma succession rests upon a basement with Avalonian affinities. It has been proposed that the West Avalonia and the Meguma terrane once formed a part of the same microcontinent and that the Meguma succession was deposited on Avalonian crust (e.g., Keppie et al 1997;Landing 2004;Murphy et al 2004a;Linnemann et al 2012). Others interpret the contact between the two terranes as a thrust (e.g., Eberz et al 1991;Keppie and Dallmeyer 1987;Waldron et al 1989;Greenough et al 1999) along which the Meguma terrane was emplaced over Avalonia.…”

Section: Introductionmentioning

confidence: 99%

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Stratigraphy, provenance and tectonic setting of the Lumsden Dam and Bluestone Quarry formations (Lower Ordovician), Halifax Group, Nova Scotia, Canada

Pothier¹,

Waldron

White

et al. 2015

atgeol

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Cambrian to Ordovician metamorphosed clastic sedimentary rocks of the Meguma terrane have no correlatives elsewhere in Atlantic Canada but are similar to successions in North Wales. In the Meguma terrane, the Cambrian Goldenville Group, dominated by sandstone, is overlain by the Halifax Group, consisting mainly of fine-grained slate and siltstone. Within the Halifax Group widespread Furongian black slate units are overlain by greyer units with rare Early Ordovician fossils, assigned to the laterally equivalent Bear River, Feltzen, Bluestone Quarry, Lumsden Dam and Glen Brook formations. The type section of the Bluestone Quarry Formation, here defined, is on Halifax Peninsula, where four constituent members are recognized; the type section of the Lumsden Dam Formation is here defined in the Lumsden Dam region near Wolfville. Detrital zircons extracted from a sample of the Lumsden Dam Formation show a range of ages similar to those displayed by the underlying Goldenville Group, including abundant Neoproterozoic zircon representing Avalonian or Pan-African sources, and a prominent group of peaks between 1.95 and 2.2 Ga, probably representing sources in West Africa. A sample from the Glen Brook Formation east of Halifax shows a similar distribution. In contrast to the correlative Welsh successions, no influx of Mesoproterozoic zircon is seen in Early Ordovician samples, suggesting that, if the two basins were in close proximity in the Cambrian, they had diverged by the Early Ordovician, possibly as a result of strike-slip motion along the margin of Gondwana.

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Section: Relationship To the Welsh Basinmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Stratigraphy, provenance and tectonic setting of the Lumsden Dam and Bluestone Quarry formations (Lower Ordovician), Halifax Group, Nova Scotia, Canada

Pothier¹,

Waldron

White

et al. 2015

atgeol

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“…We use the Nd isotope signature of peat to decipher between local and distal sources (such as in Le Roux et al, 2012). The observed eNd variability (À13 to À9) in Misten peat samples is interpreted as a mixing between dust sources (Table 3) from local (Early Cambrian shales = À11.3, André et al, 1986; Early Cambrian phyllades = À10.8 and mean Paleozoic shales = À12.2, Linnemann et al, 2012), regional soils (mean European crust = À10.8, Michard et al, 1985; mean European loess = À11.6, data from Gallet et al, 1998) and desert particles (mean Saharan airbornes = À12.9 -data from Goldstein et al, 1984;Grousset et al, 1988a,b;Colin, 1993;Henry et al, 1994;Rognon et al, 1996). The eNd variability is further compared with the humification degree to evaluate the local relative humidity conditions (Fig.…”

Section: Climate-related Dust Record In Misten Peat Bog Over the Histmentioning

confidence: 99%

Deciphering human–climate interactions in an ombrotrophic peat record: REE, Nd and Pb isotope signatures of dust supplies over the last 2500years (Misten bog, Belgium)

Fagel

Allan

Roux

et al. 2014

Geochimica et Cosmochimica Acta

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, et al.. Deciphering human-climate interactions in an ombrotrophic peat record: REE, Nd and Pb isotope signatures of dust supplies over the last 2500 years (Misten bog, Belgium). Geochimica et Cosmochimica Acta, Elsevier, 2014Elsevier, , vol. 135, pp. 288-306. 10.1016Elsevier, /j.gca.2014 To cite this Fagel, Nathalie and Allan, Mohammed and Le Roux, Gaël and Mattielli, Nadine and Piotrowska, Natalia and Sikorski, Jaroslaw AbstractA high-resolution peat record from Eastern Belgium reveals the chronology of dust deposition for the last 2500 years. REE and lithogenic elements in addition to Nd and Pb isotopes were measured in a 173 cm age-dated peat profile and provide a continuous chronology of dust source and intensity. Calculated dust flux show pronounced increases c. 300 BC, 600 AD, 1000 AD, 1200 AD and from 1700 AD, corresponding to local and regional human activities combined with climate change.The Industrial Revolution samples (1700-1950 AD) are characterised by a significant enrichment in Sc-normalised REE abundance (sum REE/Sc > 25) due to intensive coal combustion. For the pre-Industrial Revolution samples, the Sc-normalised REE abundance (10 < Sum REE/Sc < 25) and the eNd variability (À13 to À9) are interpreted by a mixing between dust particles from local soils and long-range transport of desert particles. Three periods characterised by dominant-distal sources (c. 320 AD, 1000 AD and 1700 AD) are consistent with local wetter-than-average intervals as indicated by a lower degree of peat humification. Local erosion prevails during the drier (higher humification) intervals (100 AD, 600 AD). On a global scale, more distal supplies are driven during colder periods, in particular during the Oort and Maunder minima, suggesting a potential link between dust deposition and global climate. Combining REE abundance, fractionation between Light REE and Heavy REE and Nd isotope data in ombrotrophic peat allows one to distinguish between dust flux changes related to human and climate forcings.

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“…This is in agreement with the fact that minerotrophic peat could receive lateral inputs. The erosion of rocks present in the Cambrian and Silurian formations in Belgium (Linnemann et al, 2012), with specific εNd vs. 147 Sm/ 144 Nd signature, influences the Nd isotopic compositions of the peat, as showed by the less negative εNd values (−8 to −5, Table 1). The abrupt changes in εNd at ∼ 6750 cal BP (2 points with εNd around −6) and ∼ 5050 cal BP (εNd around −5.5) can be due to mantlederived material such as long-range-transported volcanic material.…”

Section: Ombrotrophic Peatmentioning

confidence: 99%

“…7. REE average normalised to upper continental crust (UCC, Taylor and McLennan, 1985) and compared to those obtained from the western Sahara (Moreno et al, 2006), German snow profile (Black Forest, Aubert et al, 2006) and Belgian slate (Linnemann et al, 2012), Belgian shales (André et al, 1986), as well as to those obtained from plagioclase minerals collected in pan-African rocks (Laouni area, Cottin et al, 1998 haran aerosol). The minerotrophic peat samples (6700-7300 cal BP) are plotted between the La/Sm and La/Yb field defined for local sources (low in La/Sm and La/Yb ratios, Fig.…”

Section: Ombrotrophic Peatmentioning

confidence: 99%

Mid- and late Holocene dust deposition in western Europe: the Misten peat bog (Hautes Fagnes – Belgium)

et al. 2013

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Abstract. Dust deposition in southern Belgium is estimated from the geochemical signature of an ombrotrophic peatland. The rare earth elements (REE) and lithogenic elements concentrations, as well as Nd isotopes, were determined by HR-ICP-MS and MC-ICP-MS, respectively, along an ∼ 6 m peat section covering 5300 yr, from 2000 to 7300 cal BP, dated by the 14 C method. Changes in REE concentration in the peat correlate with those of Ti, Al, Sc and Zr that are lithogenic conservative elements, suggesting that REE are immobile in the studied peat bogs and can be used as tracers of dust deposition. Peat humification and testate amoebae were used to evaluate hydroclimatic conditions. The range of dust deposition varied from 0.03 to 4.0 g m −2 yr −1 . The highest dust fluxes were observed from 2750 to 2550 cal BP and from 5150 to 4750 cal BP, and correspond to cold periods. The εNd values show a large variability from −13 to −5, identifying three major sources of dusts: local soils, distal volcanic and desert particles.

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The Cambrian to Devonian odyssey of the Brabant Massif within Avalonia: A review with new zircon ages, geochemistry, Sm–Nd isotopes, stratigraphy and palaeogeography

Cited by 103 publications

References 66 publications

Stratigraphy, provenance and tectonic setting of the Lumsden Dam and Bluestone Quarry formations (Lower Ordovician), Halifax Group, Nova Scotia, Canada

Stratigraphy, provenance and tectonic setting of the Lumsden Dam and Bluestone Quarry formations (Lower Ordovician), Halifax Group, Nova Scotia, Canada

Deciphering human–climate interactions in an ombrotrophic peat record: REE, Nd and Pb isotope signatures of dust supplies over the last 2500years (Misten bog, Belgium)

Mid- and late Holocene dust deposition in western Europe: the Misten peat bog (Hautes Fagnes – Belgium)

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