U–Pb geochronology of the Sondalo gabbroic complex (Central Alps) and its position within the Permian post-Variscan extension

Petri, Benoît; Mohn, Geoffroy; Skrzypek, Etienne; Mateeva, Tsvetomila; Galster, Federico; Manatschal, Giänreto

doi:10.1007/s00531-017-1465-x

Cited by 35 publications

(41 citation statements)

References 105 publications

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“…Permian intrusives ages after Del Moro and Notarpietro (1987), Tribuzio et al (1999), Braga et al (2001 and Petri et al (2017). Legend: AD=Adula; TA=Tambo'; SU=Suretta; PL=Platta;…”

Section: Resultsmentioning

confidence: 99%

“…The TS consists of higher grade sillimanite-bearing gneisses and micaschists, garnet-and biotite-bearing amphibolites, marbles and pegmatites (Bonsignore and Ragni, 1966;Venzo et al, 1971;Gazzola et al, 2000;Spalla et al, 2005). Several post-Variscan acidic and basic intrusives (granitoids, diorites and minor gabbros) occur in both units (Knig, 1964;Ragni, 1966, 1968;Venzo et al, 1971;Del Moro et al, 1981;Bockemhl and Pfister, 1985;Tribuzio et al, 1999;Petri et al, 2017). The mineral ages of these igneous rocks span over two time intervals: the first ranges from 300 to 260 Ma (white mica and biotite Rb/Sr; plagioclase and amphibole Rb/Sr and Sm/Nd; zircon U/Pb) and has been interpreted as igneous cooling ages, and the second ranges from 125 to 78…”

Section: Nappe (Lcn) and Tonale Series (Ts) The Tonale Series Outcromentioning

confidence: 99%

“…The intrusion of the Sondalo gabbroic complex occurred initially at the mid-crustal level (0.5-0.6 GPa) and was progressively exhumed (<0.45 GPa), which generated partial melting of the host rock in the metamorphic aureole (Petri et al, 2016). The , 1989;Lardeaux and Spalla, 1991;Diella et al, 1992;Spalla et al, 1995;Handy et al, 1999;Schuster et al, 2001;Schuster and Stüwe, 2008;Marotta et al, 2009;Spalla et al, 2014;Marotta et al, 2018;Petri et al, 2017). Older Paleozoic ages (ca.…”

Section: Accepted M Manuscriptmentioning

confidence: 99%

“…In the Austroalpine crust of Central Alps, the lack of the strong Alpine eclogitisation that characterises the Western Austroalpine Domain (e.g., Polino et al, 1990;Spalla et al, 1996;Bousquet et al, 2004;Gerya and Stöckhert, 2006;Roda et al, 2012;Lardeaux, 2014;Regis et al, 2014) and the concurrent occurrence of widespread mafic to acid Permian intrusions (Gazzola et al, 2000;Zucali, 2001;Spalla et al, 2003;Gosso et al, 2004;Spalla and Zucali, 2004;Salvi et al, 2010;Petri et al, 2016Petri et al, , 2017 make this portion 4…”

Section: Introductionmentioning

confidence: 99%

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Pre-Alpine contrasting tectono-metamorphic evolutions within the Southern Steep Belt, Central Alps

Roda¹,

Zucali²,

Li³

et al. 2018

Preprint

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“…Permian intrusives ages after Del Moro and Notarpietro (1987), Tribuzio et al (1999), Braga et al (2001 and Petri et al (2017). Legend: AD=Adula; TA=Tambo'; SU=Suretta; PL=Platta;…”

Section: Resultsmentioning

confidence: 99%

Section: Nappe (Lcn) and Tonale Series (Ts) The Tonale Series Outcromentioning

confidence: 99%

Section: Accepted M Manuscriptmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Pre-Alpine contrasting tectono-metamorphic evolutions within the Southern Steep Belt, Central Alps

Roda¹,

Zucali²,

Li³

et al. 2018

Preprint

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“…One major characteristic feature of the Western European lithosphere is the existence of widespread magmatic intrusions and underplating of the continental crust (Figures c and d; Bois et al, ; Rey, ; Schuster & Stüwe, ), which occurred during late stages and after the orogenic collapse of the Variscan orogen (Petri et al, ). In contrast, the continental margins of Norway and Greenland do not show evidence for prerift underplating, and no significant postorogenic magmatic activity is recorded north of the Elbe lineament during Permian times (Figure c; Fossen et al, ; Meissner, ).…”

Section: Introductionmentioning

confidence: 99%

Impact of Mafic Underplating and Mantle Depletion on Subsequent Rifting: A Numerical Modeling Study

et al. 2019

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Orogenesis in the Variscan belt of Western Europe was followed by a major magmatic event during the Permian that formed a mafic lower crust by crystallizing pyroxenite and gabbros from mantle‐derived melts at the base of the continental crust. Partial melting of the asthenosphere left a significantly depleted mantle that was progressively incorporated into the subcontinental lithospheric mantle as the orogenic domain cooled. The potential impact of such large‐scale thermal and lithologic layering has never been taken into account in the study of the Alpine Tethys and North Atlantic rift systems that developed subsequently in Western Europe. Here we investigate via numerical modeling how a mafic heterogeneity within the lowermost part of a quartzo‐feldspathic continental crust and/or a zone of depleted mantle within the lithospheric mantle beneath a former orogenic domain could have influenced subsequent rifting. Our numerical modeling results indicate that, in a thermally equilibrated lithosphere, a mafic body within the lower continental crust or a zone of shallow depleted mantle prevents rifting of overlying weaknesses (e.g., faults and suture zones). We propose that the regional mafic lower crust beneath the Variscan orogenic domain may explain why the Tethyan and southern North‐Atlantic rift systems did not localize at former suture zones of the Western European orogenic lithosphere.

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Pre‐Alpine (Variscan) Inheritance: A Key for the Location of the Future Valaisan Basin (Western Alps)

2018

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The boundary between the Helvetic and the Penninic (=Briançonnais) Zones has long been recognized as a major fault (“Penninic Front”) in the Western Alps. A narrow oceanic domain has been postulated at least along part of this boundary (the Valaisan Basin). However, the information provided by the pre‐Triassic basement has not been fully exploited and will be discussed here in detail. The igneous and metamorphic history of the pre‐Triassic basement shows significant differences between the External Massifs from the Helvetic Zone, with abundant Late Carboniferous granites, and the basement of the Briançonnais Zone, including the Internal Massifs (Dora‐Maira, Gran Paradiso, and Monte Rosa), devoid of Carboniferous granites. A major coal‐bearing basin, the “Zone Houillère,” opened along this boundary. This limnic intramontane basin has never been properly investigated. The Zone Houillère is not comparable with the external, paralic, flexural, basins on both sides of the Variscan belt but shows similarities with the Saar‐Saale Basin. Like the latter, we interpret the Zone Houillère as a transtensional basin opened along a major, crustal‐scale, fault zone, namely, the East Variscan Shear Zone. The Permian magmatism and sedimentation displays contrasting distributions, being absent or very localized in the Helvetic Zone, and widespread in the Penninic Zone. The above data indicate that the structural inheritance from the Variscan belt plays a major role in defining the future location of the Valaisan Basin, that is, the boundary between the European paleomargin and the Briançonnais microcontinent.

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U–Pb geochronology of the Sondalo gabbroic complex (Central Alps) and its position within the Permian post-Variscan extension

Abstract: International audienc

Cited by 35 publications

References 105 publications

Pre-Alpine contrasting tectono-metamorphic evolutions within the Southern Steep Belt, Central Alps

Pre-Alpine contrasting tectono-metamorphic evolutions within the Southern Steep Belt, Central Alps

Impact of Mafic Underplating and Mantle Depletion on Subsequent Rifting: A Numerical Modeling Study

Pre‐Alpine (Variscan) Inheritance: A Key for the Location of the Future Valaisan Basin (Western Alps)

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