Provenance of upper Triassic sandstone, southwest Iberia (Alentejo and Algarve basins): tracing variability in the sources

Pereira, M. Francisco; Ribeiro, Carlos; Gama, Cristina; Drost, Kerstin; Chichorro, M.; Vilallonga, F.; Hofmann, Mandy; Linnemann, Ulf

doi:10.1007/s00531-016-1295-2

Cited by 17 publications

(21 citation statements)

References 63 publications

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“…The Triassic samples came from the basal units of the Silves Group (Conraria Formation in the Lusitanian Basin, AB1 and SC1 in Algarve and Alentejo basins), and comprise three samples from the Lusitanian Basin, one sample from the Alentejo Basin and two samples from the Algarve Basin. Pb detrital zircon data in this research complement and are discussed together with previously published detrital zircon data from coeval units, namely those reported for the Upper Pennsylvanian of the Buçaco Basin (Dinis et al, 2012) and the Triassic of the Lusitanian Basin (Pereira et al, 2016) and the Alentejo and Algarve basins (Pereira et al, 2017). Sample selection was undertaken so as to give a regional perspective on the paleogeographic conditions during the transition from Pangea amalgamation to fragmentation, encompassing: 1) the late Carboniferous and early Permian episodes of deformation associated with N-S and WNW-ESE shear zones and 2) the subsequent Triassic rifting in West and South Iberia.…”

Section: Sampled Sedimentary Rockssupporting

confidence: 79%

“…In this study we present new U-Pb detrital zircon age data from a set of sedimentary basins on Western and Southern Iberia that formed during the transition from the final stages of Pangea amalgamation (Pennsylvanian) to early fragmentation (Permian-Triassic) ( Table 1). These new geochronology results are coupled with recently published data for the Triassic sequences of the Lusitanian (Pereira et al, 2016), Alentejo and Algarve basins (Pereira et al, 2017), and the Pennsylvanian of the Buçaco Basin (Dinis et al, 2012) of western and southern Iberia (Fig. 2).…”

Section: Introductionsupporting

confidence: 80%

“…and the scale of the sedimentary transport systems during both rifting development and the subsequent transition to a passive margin (Sánchez Martínez et al, 2012;Dinis et al, 2016;Pereira et al, 2016Pereira et al, , 2017. In this study we present new U-Pb detrital zircon age data from a set of sedimentary basins on Western and Southern Iberia that formed during the transition from the final stages of Pangea amalgamation (Pennsylvanian) to early fragmentation (Permian-Triassic) ( Table 1).…”

Section: Introductionmentioning

confidence: 98%

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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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Section: Sampled Sedimentary Rockssupporting

confidence: 79%

Section: Introductionsupporting

confidence: 80%

Section: Introductionmentioning

confidence: 98%

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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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“…This seems consistent with small but significant amounts of detrital zircon present in several Neoproterozoic to Paleozoic rocks of Libya and Morocco, as well as from several peri-Gondwana terrains presently outcropping in southern Europe. Examples of the latter are Sardinia, the Pyrenees, southern Portugal, Central Iberia (Díez-Fernández et al, 2010;Avigad et al, 2012;Meinhold et al, 2013; A C C E P T E D M A N U S C R I P T Orejana et al, Margalef et al, 2016;Pereira et al, 2017;Henderson et al, 2016). The ultimate origin of the Mesoproterozoic to Tonian zircon from all these areas is generally attributed to source rocks located in central-eastern North Africa, i.e.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Proterozoic to Mesozoic evolution of North-West Africa and Peri-Gondwana microplates: Detrital zircon ages from Morocco and Canada

Marzoli

Davies

Youbi

et al. 2017

Lithos

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The complex history of assemblage and disruption of continental plates surrounding the Atlantic Ocean is in part recorded by the distribution of detrital zircon ages entrained in continental sedimentary strata from Morocco (Central High Atlas and Argana basins) and Canada (Grand Manan Island, New Brunswick). Here we investigate detrital zircon from the latest Triassic (ca. 202 Ma) sedimentary strata directly underlying lava flows of the Central Atlantic magmatic province or interlayered within them. SHRIMP (Sensitive High-Resolution Ion Microprobe) and LA-ICP-MS (Laser Ablation-Inductively Coupled Plasma-Mass Spectrometry) U-Pb ages for zircon range from Paleozoic to Archean with a dominant Neoproterozoic peak, and significant amounts of ca. 2 Ga zircon. These ages suggest a prevailing West African (Gondwanan) provenance at all sampling sites. Notably, the Paleoproterozoic zircon population is particularly abundant in central Morocco, north of the High Atlas chain, suggesting the presence of Eburnean-aged rocks in this part of the country, which is consistent with recent geochronologic data from outcropping rocks. Minor amounts of late Mesoproterozoic and early Neoproterozoic zircon (ca. 1.1-0.9 Ga) in Moroccan samples are more difficult to interpret. A provenance from Avalonia or Amazonia, as proposed by previous studies is not supported by the age distributions observed here. An involvement of more distal source regions, possibly located in northeastern Africa (Arabian Nubian Shield) would instead be possible. Paleozoic zircon ages are abundant in the Canadian sample, pointing to a significant contribution from Hercynian aged source rocks. Such a signal is nearly absent in the Moroccan samples, suggesting that zircon-bearing Hercynian granitic rocks of the Moroccan Meseta block were not yet outcropping at ca. 200

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“…In order to identify the potential sources of the late Triassic basins from the Central Atlantic Ocean realm, the configuration of the late Palaeozoic orogen, showing the probable spatial distribution of the distinct provenances of the Palaeozoic terranes, before Pangaea fragmentation, must be reconstructed. Terrestrial deposition was diachronous in Iberia (López-Gómez et al 2019), presenting Late Permian -Middle Triassic ages in eastern and southeastern basins (Pyrenees, Iberian Ranges and Betics;López-Gómez et al 2005;Sánchez Martínez et al 2012) and Late-Middle Triassic ages in western and southwestern ones (Lusitanian, Alentejo and Algarve basins: Palain, 1976;Azerêdo et al 2003;Alves et al 2006;Soares et al 2012;Pereira et al 2016bPereira et al , 2017cDinis et al 2018).…”

Section: Introductionmentioning

confidence: 99%

Detrital zircon provenance of Triassic sandstone of the Algarve Basin (SW Iberia): evidence of Gondwanan- and Laurussian-type sources of sediment

et al. 2020

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Detrital zircon populations from six samples of upper Triassic sandstone (Algarve Basin) were analysed, yielding mostly Precambrian ages. zircon age populations of the Triassic sandstone sampled from the western and central sectors of the basin are distinct, suggesting local recycling and/or lateral changes in their sources. Our findings and the available detrital zircon ages from the Palaeozoic terranes of SW Iberia, Nova Scotia and NW Morocco were jointly examined using the Kolmogorov–Smirnov test and multidimensional scaling diagrams. The obtained results enable direct discrimination of competing Laurussian-type and Gondwanan-type sediment sources, involving recycling and mixing relationships. The detrital zircon populations of the Algarve Triassic sandstone are very different from those of the lower–upper Carboniferous Mértola and Mira formations (South Portuguese Zone), upper Devonian – lower Carboniferous Horta da Torre, Represa and Santa Iria formations (Pulo do Lobo Zone), and the late Carboniferous Santa Susana and early Permian Viar basins, which are ruled out as potential sources. The detrital zircon populations of Triassic sandstone from the central sector and those from the Ossa–Morena Zone Ediacaran–Cambrian siliciclastic rocks, upper Devonian – Carboniferous Ronquillo, Tercenas, Phyllite-Quartzite and Brejeira formations (South Portuguese Zone), and Frasnian siliciclastic rocks of the Pulo do Lobo Zone are not statistically distinguishable. Thus, sedimentation in the central sector was influenced by Gondwanan- and Laurussian-type putative sources exposed in SW Iberia, in contrast to the western sector, where Meguma Terrane and Sehoul Block Cambrian siliciclastic rocks allegedly constituted the main (Laurussian-type) sources. These findings provide insights into the denudation of distinctive source terranes distributed along the late Palaeozoic suture zone that juxtaposed the Laurussian and Gondwanan margins.

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Provenance of upper Triassic sandstone, southwest Iberia (Alentejo and Algarve basins): tracing variability in the sources

Cited by 17 publications

References 63 publications

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

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

Proterozoic to Mesozoic evolution of North-West Africa and Peri-Gondwana microplates: Detrital zircon ages from Morocco and Canada

Detrital zircon provenance of Triassic sandstone of the Algarve Basin (SW Iberia): evidence of Gondwanan- and Laurussian-type sources of sediment

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