U–Pb geochronology and Hf isotope ratios of magmatic zircons from the Iberian Pyrite Belt

Rosa, Diogo R. N.; Finch, Adrian A.; Andersen, Tom; Inverno, Carlos

doi:10.1007/s00710-008-0022-5

Cited by 131 publications

(103 citation statements)

References 38 publications

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“…400-340 Ma. Part of this time spectrum coincides with the ages obtained for the magmatism of the South Portuguese Zone (Rosa et al 2009: Cercal ca. 369-374 Ma, Azinheira dos Barros ca.…”

Section: Discussionsupporting

confidence: 83%

Deciphering a Multipeak Event in a Noncomplex Set of Detrital Zircon U–Pb Ages

et al. 2014

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The determination of U-Pb ages from detrital zircons of sedimentary rocks using LA-ICP-MS has been widely used to develop studies of provenance analysis. A problem that frequently arises is to find a population that appears to be noncomplex despite several perceptible age peaks in their spectrum. These peaks are qualitatively defined through diagrams of relative probability (probability density function or PDF), but it is difficult to quantify their statistical significance relative to a zircon-forming multipeak event. Therefore, the question arises as to whether we can decipher and characterize a multipeak event in a noncomplex set of detrital zircon U-Pb ages. This work is an attempt to answer the above question by means of a statistical analysis. The objectives are: (1) to determine the most appropriate minimum number of zircon age populations (peaks); (2) to characterize each peak in terms of age and event duration; and (3) to compare results obtained for two datasets showing similar zircon ages. The process starts by using a cluster analysis to group zircon ages into a set of consistent clusters. A Gaussian kernel function is then fitted to each cluster and summed to obtain a theoretical PDF. At the end of the process, the best modelled PDF must coincide with the original PDF at C95 %, and the deciphered peaks can then be characterized.

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“…400-340 Ma. Part of this time spectrum coincides with the ages obtained for the magmatism of the South Portuguese Zone (Rosa et al 2009: Cercal ca. 369-374 Ma, Azinheira dos Barros ca.…”

Section: Discussionsupporting

confidence: 83%

Deciphering a Multipeak Event in a Noncomplex Set of Detrital Zircon U–Pb Ages

et al. 2014

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“…A proximal provenance is also supported by several features of the age spectra (Fig. 8), such as: (1) the abundance of Cryogenian to Ediacaran zircon ages, which are very abundant in basement metapelites (Pereira et al, 2012a(Pereira et al, , 2012bBraid et al, 2011;Talavera et al, 2012;Shaw et al, 2014;Pérez-Cáceres et al, 2017); (2) the coincidence of the Paleozoic zircon population with magmatic events in the surrounding areas (Fernández-Suárez et al, 2000;Jesus et al, 2007;Azor et al, 2008;Rosa et al, 2009) and the detrital record of the upper Paleozoic basement rocks (Braid et al, 2011;Dinis et al, 2012;Pereira et al, 2012b;Pérez-Cáceres et al, 2017).…”

Section: Triassic (Early Fragmentation)mentioning

confidence: 71%

The transition from Pangea amalgamation to fragmentation: Constraints from detrital zircon geochronology on West Iberia paleogeography and sediment sources

Dinis

Fernandes

Jorge

et al. 2018

Sedimentary Geology

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Detrital zircon U-Pb geochronology data from late Carboniferous to Triassic clastic sedimentary rocks in SW Iberia were used to investigate the regional paleogeography during the transition from Pangea amalgamation to breakup. The major U-Pb zircon age peaks are middle Devonian to Carboniferous (~390-300 Ma), CambrianOrdovician (~530-440 Ma), Cryogenian-Ediacaran (~750-540 Ma), Stenian-Tonian (~1.2-0.9 Ga) and Paleoproterozoic (~2.3-1.8 Ga). Rapid exhumation of Variscan crystalline rocks at the contact between the South Portuguese zone and Ossa Morena Zone, explains the abundance of late Paleozoic ages in the upper Carboniferous-lower Permian continental successions. The U-Pb zircon data constrain the maximum depositional age of the Santa Susana Basin to c. 304 Ma and the Viar Basin to c. 297 Ma. The Triassic sequences, despite being c. 100 Ma younger than the Variscan tectonothermal events, contain low proportions of late Paleozoic zircon. The major peaks in all zircon spectra closely resemble those found in the adjacent basement rocks, indicating small source areas, mainly located near the rift shoulders. Longer travelled fluvial systems are postulated for the eastern portions of the Algarve Basin, which was closer to the westward advancing Tethys Ocean than the rift basins of West Iberia. Sequences that contain significant proportions of~1.2-0.9 Ga zircon are probably recycled from post-collisional Carboniferous-Permian continental deposits that were more extensive than those found today.

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“…U-Pb dating analyses were performed using a Nu Plasma HR multicollector ICPMS at the Geological Survey of Finland in Espoo using a technique very similar to Rosa et al (2009) (Stacey and Kramers, 1975) correction was used when the analysis showed common lead contents above the detection limit. The calculations were done off-line, using an interactive spreadsheet program written in Microsoft Excel/ VBA by Tom Andersen (Rosa et al, 2009).…”

Section: Methodsmentioning

confidence: 99%

“…The calculations were done off-line, using an interactive spreadsheet program written in Microsoft Excel/ VBA by Tom Andersen (Rosa et al, 2009). To compensate for drift in instrument sensitivity and Faraday vs. electron multiplier gain during an analytical session, a correlation of signal vs. time was assumed for the reference zircons.…”

Section: Methodsmentioning

confidence: 99%

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The Salittu Formation in southwestern Finland, part I: Structure, age and stratigraphy

Nironen¹,

Mänttäri²,

Väisänen³

2016

Bull Geol Soc Finland

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Because of the relatively low metamorphic grade, low strain and well-preserved early structures in volcanic and volcaniclastic rocks, the Orijärvi triangle (in the center of the larger Orijärvi area) is one of the few locations in the Svecofennian orogen of southern Finland where lithostratigraphy has been determined. The geochemistry of the picriticbasaltic metavolcanic rocks of the Salittu Formation, located in the northeastern part of the Orijärvi area, has been characterized but otherwise the bedrock and structures have been barely touched. After remapping we give an interpretation of structural evolution, provide new age data to constrain duration of volcanism at Salittu, and refine the stratigraphy in the Orijärvi area.The original stratigraphy is visible at Salittu: metabasalt overlies migmatitic gneisses, and metapicrite is on top. The rocks were folded during early Svecofennian D 1 -D 2 deformations, and the large synformal structures developed as D 2 -D 5 interference structures formed during late Svecofennian D 5 deformation. The structural pattern at Salittu is much the same as in the Orijärvi triangle.The new age data, combined with earlier published data, constrains the Salittu volcanism at ca. 1875 Ma. The stratigraphy in the Orijärvi area consists of the early (1.90-1.89 Ga) volcanic Orijärvi Formation, overlain by the sedimentary Vetio Formation, the volcanic Kisko Formation, the volcanic-sedimentary Ahdisto Formation, the volcanic Toija Formation, and on top the Salittu Formation, all emplaced at 1.88-1.87 Ga. We propose a model in which the Orijärvi Formation represents magmatism at the margin of a microcontinent, and the overlying package represents sedimentation and magmatism above a subduction zone during an initial stage of microcontinental accretion. D 1 deformation occurred in an advanced stage of accretion, after emplacement of the volcanic rocks of the Salittu Formation.

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U–Pb geochronology and Hf isotope ratios of magmatic zircons from the Iberian Pyrite Belt

Cited by 131 publications

References 38 publications

Deciphering a Multipeak Event in a Noncomplex Set of Detrital Zircon U–Pb Ages

Deciphering a Multipeak Event in a Noncomplex Set of Detrital Zircon U–Pb Ages

The transition from Pangea amalgamation to fragmentation: Constraints from detrital zircon geochronology on West Iberia paleogeography and sediment sources

The Salittu Formation in southwestern Finland, part I: Structure, age and stratigraphy

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