Sveconorwegian massif-type anorthosites and related granitoids result from post-collisional melting of a continental arc root

Auwera, Jacqueline Vander; Bolle, Olivier; Bingen, Bernard; Liégeois, Jean-Paul; Bogaerts, Michel; Duchesne, Jean-Clair; Waele, Bert De; Longhi, J.

doi:10.1016/j.earscirev.2011.04.005

Cited by 96 publications

(56 citation statements)

References 116 publications

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“…The contribution from mantle and lower crust is consistent with both the back-arc and the extension-delamination hypothesis. It is also consistent with the isotope geochemical characteristics of the HBG suite (Andersen et al, 2009). Vander Auwera et al (2011, however, postulated a provenance of the more juvenile component by melting of underplated mafic crust.…”

Section: Discussionsupporting

confidence: 74%

“…Burial during this event caused the regional metamorphism, reaching locally granulitegrade conditions. The HBG suite is then interpreted as a function of the subsequent relaxation with gravitational collapse and upwelling of astenospheric mantle, the shorter-lived anorthosite-mangerite-charnockite plutonism indicating melting of dry and reduced lower crust whereas the HBG is attributed to melting of wet and oxidized lower crust (Vander Auwera et al, 2011). The contrasting view advanced by Slagstad et al (2013a) considers the SMB suite instead as a Cordilleran-type, subduction-related, plutonic complex.…”

Section: Discussionmentioning

confidence: 99%

“…Three main plutonic associations have been recognised: (1) the Sirdal Magmatic Belt (SMB), including the Feda-Fennefoss suite, formed between 1060 and 1020 Ma (Bingen et al, 2008(Bingen et al, , 2015Vander Auwera et al, 2011;Slagstad et al, 2013a;Coint et al, 2015); (2) the hornblende-biotitegranitoid suite (HBG), formed between 990 and 920 Ma (Bingen et al, 2008;Vander Auwera et al, 2011); and (3) the anorthosite-mangerite-charnockite suite formed between 950 and 920 Ma (Schärer et al, 1996;Vander Auwera et al, 2011). The SMB is a calc-alkaline, magnesian association whereas the HBG is more alkaline and ferroan (Slagstad et al, 2013a).…”

Section: Discussionmentioning

confidence: 99%

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The U–Pb age of the Finse batholith, a composite bimodal Sveconorwegian intrusion

Jensen¹,

Corfú²

2016

NJG

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The Sveconorwegian autochthonous basement in the Finse area, South Norway, comprises a c. 900 km 2 bimodal batholith, dominated by K-feldspar megacrystic granite. The granite is locally intermingling with gabbroic rocks, and cut by different generations of pegmatite and aplite dykes. Zircon U-Pb geochronological data obtained by ID-TIMS demonstrate that granite, granodiorite and gabbro are coeval, as they define a common upper intercept age of 985.6 ± 1.6 Ma, dating emplacement of the batholith. Titanite is variously disturbed by later Sveconorwegian events. Pegmatites cross-cutting all structures yield zircon and titanite ages of 976 ± 8 Ma, 939 ± 2, and possibly 958 ± 2 Ma, reflecting the latest stages of the evolution of the batholith. The Finse batholith is one of the earliest members of the widespread ferroan hornblende-biotite-granitoid (HBG) suite, in the western part of the Sveconorwegian orogen.

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Section: Discussionsupporting

confidence: 74%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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The U–Pb age of the Finse batholith, a composite bimodal Sveconorwegian intrusion

Jensen¹,

Corfú²

2016

NJG

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“…On the other hand, geological mapping of these granitic/granodioritic blocks is already partially based on the interpretation of the magnetic data. In any case, these magnetically anomalous granites are exposed at the surface in many places in South Norway where they have been well studied (e.g., Sylvester, 1998;Bolle et al, 2003;Van der Auwera et al, 2011). Based on the 3D magnetic modelling, these anomalous granitic blocks are characterised by almost N-S, regionally continuous, subvertical zones with increased magnetic susceptibility, varying from 0.03 SI to 0.06 SI on average.…”

Section: Figure 11 (A) Modelled Induced and Remanent Magnetic Anomalmentioning

confidence: 99%

Deep structure of the northern North Sea and southwestern Norway based on 3D density and magnetic modelling

Maystrenko¹,

Olesen²,

Ebbing³

et al. 2017

NJG

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The deep structure of the northern North Sea and the adjacent Norwegian mainland has been analysed by integrating all available structural data in combination with 3D density and magnetic modelling into a lithosphere-scale 3D structural model. The modelled configurations of the sedimentary cover and crystalline crust are consistent with the long-wavelength components of the observed gravity and magnetic fields over the study area. The first-order configurations of the top of the crystalline basement and the Moho topography have been obtained. According to the 3D density modelling, the low-density upper-crustal block beneath the Horda Platform has been shown to indicate a possible presence of metasedimentary and/or fractured granitic rocks. Possible remnants of island arc chains within the central part of the North Sea between the Laurentian and Baltican crustal domains are supported by the modelling. Moreover, based on the results of the 3D magnetic modelling, the 3D density/structural model has been differentiated into smaller crustal blocks with different magnetic properties, implying that these magnetically derived crustal blocks most likely differ lithologically from the rest of the initial density-based larger layers. Within the mainland, most of the crustal blocks with increased magnetic susceptibility are related to granitic and/or granodioritic rocks which are well mapped at the surface according to geological data. A prominent middle-upper crustal magmatic intrusion has been modelled within the northern part of the NorwegianDanish Basin. The local magnetic pattern supports a possible Permian age for this intrusion, whereas the regional magnetic pattern and known geology from the mainland indicate a Sveconorwegian origin as a more viable alternative. At the mantle level, a low-density lithospheric mantle has been modelled beneath NW Norway and adjacent offshore areas, reflecting the likely presence of an upper-mantle low-velocity zone there.

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“…However, most anorthosite provinces seem to be associated with major lineaments (Corrigan and Hanmer, 1997;Scoates and Chamberlain, 1997;Duchesne et al, 1999;Ryan, 2000;Bogdanova et al, 2004), and a consensus is emerging that anorthosites were emplaced in continental arc environments in a post-collisional regime Zhang et al, 2007;Vander Auwera et al, 2011;Bybee et al, 2014).…”

Section: Crystallization Conditions Of Anorthositesmentioning

confidence: 99%

Fe–Ti–V–P ore deposits associated with Proterozoic massif-type anorthosites and related rocks

Charlier

Namur

Bolle

et al. 2015

Earth-Science Reviews

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a b s t r a c t a r t i c l e i n f oMagmatic rocks containing economic concentrations of iron, titanium, vanadium and phosphorous are commonly associated with massif-type anorthosites and related rocks. This rock association is part of the anorthositemangerite-charnockite-(rapakivi-)granite suites that are restricted to the Proterozoic. Understanding the geochemistry and emplacement mechanisms of ilmenite, magnetite and apatite ore deposits is crucial for exploration, efficient mining operations and ore processing. This review discusses the controlling factors on the grade of an ore, its mineralogy, and its major and trace element distribution. We present petrogenetic models of currently mined deposits (Lac Tio, Tellnes, Damiao) and discuss the characteristics of minor ore bodies from anorthosite provinces worldwide (Grenville, North China Craton, East European Craton, Rogaland, Laramie). Models of formation of anorthosite and related rocks are presented, as well as the nature of the possible parental magmas of the suite. A mineralogical classification of Fe-Ti ores is proposed: (1) Gabbro-noritic ilmenite ore ± apatite ± magnetite; (2) Ti-magnetite-dominated ore; (3) Nelsonite (Fe-Ti oxides + apatite); and (4) Rutile-ilmenite ore. The stability of ilmenite and magnetite is then critically reviewed and the influence of various factors, particularly oxygen fugacity and crystallization pressure, is examined. We discuss liquidus compositions of Fe-Ti oxides and the behavior of important trace elements such as Cr and V, both of which are sensitive to fO 2 variations. Postcumulus evolution of both oxides can occur due to re-equilibration with trapped liquid, re-equilibration with ferromagnesian silicates, exsolution, oxidation, reaction between ilmenite and magnetite, and metamorphic overprinting. These various processes are described and their effects on the oxide geochemistry are emphasized. Several potential ore-forming processes have been invoked and can explain the formation of huge concentration of ilmenite, ±magnetite, ±apatite. Fractional crystallization can be combined with crystal sorting and plagioclase buoyancy to produce relative enrichment of dense ore minerals. Silicate liquid immiscibility can segregate conjugate Si-rich and Fe-rich melts, the latter being enriched in Fe-Ti-P. Magma mixing can produce hybrid magmas located in a single-phase field of the phase diagram and precipitate a pure ilmenite cumulate. Alternative processes are also described, such as ejection of Fe-Ti-enriched residual melts by filter-pressing and compaction, solidstate remobilization of ilmenite in veins, and hydrothermal transport of Fe and Ti from the host anorthosite followed by concentration in veins and lenticular ore bodies. The magnetic properties of Fe-Ti ore deposits present contrasting signatures, depending on whether the natural remanent magnetization is dominated by hemo-ilmenite or multi-domain magnetite. Micro-and macro-scale deformation features of ore rocks are intimately correlated with magma emplacement, and...

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Sveconorwegian massif-type anorthosites and related granitoids result from post-collisional melting of a continental arc root

Cited by 96 publications

References 116 publications

The U–Pb age of the Finse batholith, a composite bimodal Sveconorwegian intrusion

The U–Pb age of the Finse batholith, a composite bimodal Sveconorwegian intrusion

Deep structure of the northern North Sea and southwestern Norway based on 3D density and magnetic modelling

Fe–Ti–V–P ore deposits associated with Proterozoic massif-type anorthosites and related rocks

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