Timing of crust formation and recycling in accretionary orogens: Insights learned from the western margin of South America

Bahlburg, Heinrich; Vervoort, Jeffrey D.; Frane, S. Andrew Du; Bock, Barbara; Augustsson, Carita; Reimann, Cornelia

doi:10.1016/j.earscirev.2009.10.006

Cited by 193 publications

(136 citation statements)

References 146 publications

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“…It is, however, also close to the ages of granites at Target Hill (Millar, Pankhurst & Fanning, 2002), about 350 km SSW of View Point. These few grains are the only representatives of post-Cambrian populations that are well represented in other South American basins (Augustsson et al 2006;Bahlburg et al 2009). This raises some doubts about the provenance of the matrix sediment and a need to consider possible alternative sources.…”

Section: Interpretation Of the Geochronology And Hf Isotope Geochemistrymentioning

confidence: 99%

“…(Data from Chernicoff et al 2010;Halpin et al 2005;Thomas et al 2010;Will et al 2010;Zeh, Gerdes & Barton, 2009. ) (Bahlburg et al 2009) but are relatively abundant in the upper parts of the Ellsworth Mountains succession ) and also from sediments and cobbles in Mesozoic sedimentary rocks from the southern Antarctic Peninsula . proposed these grains must have originated from southern Africa, but with respect to the View Point succession, it is entirely possible that detritus was first deposited in the Ellsworth-Whitmore Mountains block or a geologically similar crustal fragment and then recycled into the View Point basin in Late Carboniferous times.…”

Section: Interpretation Of the Geochronology And Hf Isotope Geochemistrymentioning

confidence: 99%

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Permo-Carboniferous conglomerates in the Trinity Peninsula Group at View Point, Antarctic Peninsula: sedimentology, geochronology and isotope evidence for provenance and tectonic setting in Gondwana

et al. 2011

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-Field observations from the Trinity Peninsula Group at View Point on the Antarctic Peninsula indicate that thick, southward-younging and overturned clastic sedimentary rocks, comprising unusually coarse conglomeratic lenses within a succession of fine-grained sandstonemudstone couplets, are the deposits of debris and turbidity flows on or at the foot of a submarine slope. Three detrital zircons from the sandstone-mudstone couplets date deposition at 302 ± 3 Ma, at or shortly after the Carboniferous-Permian boundary. Conglomerates predominantly consist of quartzite and granite and contain boulders exceeding 500 mm in diameter. Zircons from granitoid clasts and a silicic volcanic clast yield U-Pb ages of 466 ± 3 Ma, 373 ± 5 Ma and 487 ± 4 Ma, respectively and have corresponding average εHf t values between +0.3 and +7.6. A quartzite clast, conglomerate matrix and sandstone interbedded with the conglomerate units have broadly similar detrital zircon age distributions and Hf isotope compositions. The clast and detrital zircon ages match well with sources within Patagonia; however, the age of one granite clast and the εHf characteristics of some detrital zircons point to a lesser South Africa or Ellsworth Mountain-like contribution, and the quartzite and granite-dominated composition of the conglomerates is similar to upper Palaeozoic diamictites in the Ellsworth Mountains. Unlike detrital zircons, large conglomerate clasts limit possible transport distance, and suggest sedimentation took place on or near the edge of continental crust. Comparison with other upper Palaeozoic to Mesozoic sediments in the Antarctic Peninsula and Patagonia, including detrital zircon composition and the style of deformation, suggests deposition of the Trinity Peninsula Group in an upper plate basin on an active margin, rather than a subduction-related accretionary setting, with slow extension and rifting punctuated by short periods of compression.

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Section: Interpretation Of the Geochronology And Hf Isotope Geochemistrymentioning

confidence: 99%

Section: Interpretation Of the Geochronology And Hf Isotope Geochemistrymentioning

confidence: 99%

Permo-Carboniferous conglomerates in the Trinity Peninsula Group at View Point, Antarctic Peninsula: sedimentology, geochronology and isotope evidence for provenance and tectonic setting in Gondwana

et al. 2011

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“…Small rivers tapping limited drainage systems likely present only a partial record of the larger source area. Large, potentially continental-scale river systems like the Mississippi of North America or the Rhine River systems in Europe, in turn, are considered to reflect the continentwide crustal record (e.g., Rino et al 2008;Bahlburg et al 2009;Condie et al 2009). A similar, homogenized signal may be expected from marine sediments after redeposition and mixing.…”

Section: Introductionmentioning

confidence: 99%

Provenance of Pleistocene Rhine River Middle Terrace sands between the Swiss–German border and Cologne based on U–Pb detrital zircon ages

Krippner

Bahlburg

2012

Int J Earth Sci (Geol Rundsch)

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“…in the western margin of Gondwana are almost continuous during the Phanerozoic, although there is evidence for a time of relative quiescence during the Devonian and Early Mississippian (390 to 340 Ma) from northern Perú to southern Chile due to the development of a passive margin at those times (Bahlburg et al, 2009). In central to southern Chile this scenario is related to the prior collision of Chilenia (Willner et al, 2009).…”

Section: Geological Settingmentioning

confidence: 99%

“…The Pampean magmatism is restricted to the Eastern Cordillera (Cañani, La Quesera and Chañi units) (Omarini et al, 2008) and the Famatinian magmatism (Bahlburg et al, 2009) includes both the Faja Eruptiva de la Puna Occidental magmatic arc (Poma et al, 2004) and the Faja Eruptiva de la Puna Oriental back-arc magmatism (Coira, 2008;Zappettini, 2008).…”

Section: Geological Settingmentioning

confidence: 99%

Geoquímica, dataciones U-Pb SHRIMP sobre circón e isótopos de Hf del magmatismo gondwánico en el NW de Argentina: petrogénesis e implicancias geodinámicas.

Poma

Zappettini

Quenardelle

et al. 2014

Andgeo

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ABSTRACT.We have carried out zircon U-Pb SHRIMP dating and Hf isotope determinations as well as geochemical analyses on three plutonic units of Gondwanan magmatism that crop out in NW Argentina. Two episodes of different age and genesis have been identified. The older one includes gabbros and diorites (Río Grande Unit) of 267±3 Ma and granitoids (belonging to the Llullaillaco Unit) of 263±1 Ma (late Permian, Guadalupian); the parent magmas were generated in an intraplate environment and derived from an enriched mantle but were subsequently contaminated by crustal components. The younger rocks are granodiorites with arc signature (Chuculaqui Unit) and an age of 247±2 Ma (middle Triassic-Anisian). Hf isotope signature of the units indicates mantle sources as well as crustal components. Hf model ages obtained are consistent with the presence of crustal Mesoproterozoic (mainly Ectasian to Calymnian (T DM(c) =1.24 to 1.44 Ga-negative Hf (T) ) and juvenile Cryogenian sources (T DM =0.65 to 0.79 Ga-positive ɛ Hf (T) ), supporting the idea of a continuous, mostly Mesoproterozoic, basement under the Central Andes, as an extension of the ArequipaAntofalla massif. The tectonic setting and age of the Gondwanan magmatism in NW Argentina allow to differentiate: a. Permian intra-plate magmatism developed under similar conditions to the upper section of the Choiyoi magmatism exposed in the Frontal Cordillera and San Rafael Block, Argentina; b. Triassic magmatism belonging to a poorly known subduction-related magmatic arc segment of mostly NS trend with evidence of porphyry type mineralization in Chile, allowing to extend this metallotect into Argentina.

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Timing of crust formation and recycling in accretionary orogens: Insights learned from the western margin of South America

Cited by 193 publications

References 146 publications

Permo-Carboniferous conglomerates in the Trinity Peninsula Group at View Point, Antarctic Peninsula: sedimentology, geochronology and isotope evidence for provenance and tectonic setting in Gondwana

Permo-Carboniferous conglomerates in the Trinity Peninsula Group at View Point, Antarctic Peninsula: sedimentology, geochronology and isotope evidence for provenance and tectonic setting in Gondwana

Provenance of Pleistocene Rhine River Middle Terrace sands between the Swiss–German border and Cologne based on U–Pb detrital zircon ages

Geoquímica, dataciones U-Pb SHRIMP sobre circón e isótopos de Hf del magmatismo gondwánico en el NW de Argentina: petrogénesis e implicancias geodinámicas.

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