Crustal melting in the lower parts of island arcs: an example from the Bremanger Granitoid Complex, west Norwegian Caledonides

Hansen, Jógvan; Skjerlie, Kjell P.; Pedersen, Rolf B.; Rosa, J. de la

doi:10.1007/s00410-001-0342-5

Cited by 49 publications

(27 citation statements)

References 69 publications

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“…The coeval Bremanger tonalite and Gåsøy gabbronorite (Fig. 1) probably reflect associated arc magmatism (Hansen et al 2002) whereas a back-arc setting has been suggested for the Sulitjelma Igneous Complex ( Fig. 1; Pedersen et al 1991).…”

Section: Revised Interpretation Of the Magnetic Signature Of The Honnmentioning

confidence: 99%

“…Time scale is based on the most recent compilation (Gradstein et al 2004). Sources: (1) Krill et al 1993;(2) this study; (3) Corfu et al 2004;(4) Vaasjoki & Sipilä 2001;Andréasson et al 2003;(5) Tucker et al 1990; (6) Northrup 1997; (7) Pedersen et al 1991;(8) Nordgulen et al 2002;(9) Tucker et al 2004;(10) Dunning & Grenne 2000;(11) Nilsen et al 2003;(12) Wilson et al 1983;(13) Hansen et al 2002;(14) R. B. Pedersen, in Hansen et al 2002;(15) Dunning & Pedersen 1988;(16) Hartz et al 2002;F. Corfu, unpubl.…”

Section: Geological Settingmentioning

confidence: 99%

“…Thereafter, predominantly crustal processes accompanied the main collisional phase. In the Scandinavian Caledonides the events at the transition into the Silurian are recorded all along the orogen and formed such prominent rock suites as the Solund-Stavfjord ophiolite, the Røros volcanogenic massive sulphide deposit, the equally mineralized Sulitjelma and Råna layered intrusions and the Halti Igneous Complex, as well as felsic plutons such as the 447 AE 7 to 430 AE 7 Ma Bindal Batholith, the Hitra-Smøla and related intrusive rocks, the Bremanger Granitoid Complex, and the granites of Sunnhordland (Andersen & Jansen 1987;Dunning & Pedersen 1988;Fossen & Austrheim 1988;Nordgulen et al 1993;Hansen et al 2002;Andréasson et al 2003;Tucker et al 2004). With few potential exceptions (e.g.…”

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confidence: 99%

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Early Silurian mafic–ultramafic and granitic plutonism in contemporaneous flysch, Magerøy, northern Norway: U–Pb ages and regional significance

Corfú

Torsvik

Andersen

et al. 2006

JGS

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The Caledonian Magerøy sequence comprises Earliest Silurian clastic metasedimentary rocks, which underwent folding and regional metamorphism and were intruded by a mafic-ultramafic complex and various granitic plutons. U-Pb ages of 438.2 AE 0.7 Ma for gabbro in the Honningsvåg Igneous Complex, 438.4 AE 0.9 Ma for an associated granite and 437.7 AE 1.6 Ma for the Finnvik granite coincide within error with the age of deposition inferred from fossils demonstrating a very rapid geological evolution. Plutons of peraluminous affinity are somewhat younger at 436.0 AE 1.0 Ma (Skarsvåg granite) and 434.5 AE 1.5 Ma (a granitic dyke in the Skarsvåg Nappe). The association of flysch deposition, folding and mafic-felsic magmatism suggests formation at a trench-ridge intersection. These Early Silurian events are the expression of a period of major magmatism in a variety of settings all along the Caledonides, probably reflecting rapid convergence and subduction during closure of the Iapetus Ocean. Re-evaluation of the palaeomagnetic signature of the Honningsvåg Igneous Complex indicates that at the time of formation the suite was located in an equatorial position, probably close to the Laurentian margin, and was subsequently translated southward by some 1350 km prior to and during emplacement onto the Baltic margin.

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Section: Revised Interpretation Of the Magnetic Signature Of The Honnmentioning

confidence: 99%

Section: Geological Settingmentioning

confidence: 99%

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confidence: 99%

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Early Silurian mafic–ultramafic and granitic plutonism in contemporaneous flysch, Magerøy, northern Norway: U–Pb ages and regional significance

Corfú

Torsvik

Andersen

et al. 2006

JGS

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“…There are many models for andesite genesis in the subduction zone of Japan, including differentiation by fractional crystallization of mafic magmas (low-K tholeiite from Adatara volcano : Fujinawa 1988), magma mixing/ co-mingling between mafic and felsic end-members (low-K andesite: Toya et al 2005; medium-K andesite: Ban & Yamamoto 2002;Hirotani & Ban 2006; high-K andesite: Inoue & Ban 1996), assimilation and fractional crystallization (DePaolo 1985) or crustal contamination (Kobayashi & Nakamura 2001;Hirotani et al 2009), re-melting of lowercrustal hydrous mafic rocks (Takahashi 1986;Kimura et al 2001Kimura et al , 2002 and melting of the mantle wedge or slab (high-magnesian andesite and adakite: Hanyu et al 2006;Hoang et al 2009). Possible processes which could produce the felsic end-member of mixed magmas are: the fractional crystallization from mafic end-member magmas (Kanisawa & Yoshida 1989;Miyagi et al 2012); the melt extraction or re-melting of partially or fully crystallized precursory mafic magmas in the upper to middle crust (Hildreth & Wilson 2007;Hirotani et al 2009;Miyagi et al 2012); the partial re-melting of mafic end-member material solidified to become hornblende gabbro or amphibolite (Feeley et al 1998;Hansen et al 2002;Toya et al 2005); and the partial re-melting of crustal basement rocks (Shuto et al 2006(Shuto et al , 2008. All of these crustal processes forming calc-alkaline andesites work effectively in mature arcs on thick crust.…”

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confidence: 99%

Evolution of late Cenozoic magmatism and the crust–mantle structure in the NE Japan Arc

et al. 2013

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Abstract:We review the evolution of late Cenozoic magmatism in the NE Japan arc, and examine the relationship between the magmatism and the crust-mantle structure. Recent studies reveal secular changes in the mode of magmatic activity, the magma plumbing system, erupted volumes and magmatic composition associated with the evolution of crust-mantle structures related to the tectonic evolution of the arc. The evolution of Cenozoic magmatism in the arc can be divided into three periods: the continental margin (66-21 Ma), the back-arc basin (21-13.5 Ma) and the island-arc period (13.5-0 Ma). Magmatic evolution in the back-arc basin and the island-arc periods appears to be related to the 2D to 3D change in the convection pattern of the mantle wedge related to the asthenosphere upwelling and subsequent cooling of the mantle. Geodynamic changes in the mantle caused back-arc basin basalt eruptions during the back-arc basin opening (basalt phase) followed by crustal heating and re-melting, which generated many felsic plutons and calderas (rhyolite/granite phase) in the early stage of the island-arc period. This was followed by crustal cooling and strong compression, which ensured vent connections and mixing between deeper mafic and shallower felsic magmas, erupting large volumes of Quaternary andesites (andesite phase).Gold Open Access: This article is published under the terms of the CC-BY 3.0 license.The NE Japan arc is a typical island arc associated with a cold subduction zone. It is one of the most well-known island arcs on Earth and provides a useful model for our understanding of how subduction zones produce magmas, including andesites. The NE Japan arc is related to the westward

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“…The negative Ce anomalies for the host metasedimentary rocks (Fig. 10a) may imply that the host rocks contain biolithites which often show negative Ce anomalies on their REE N patterns (Hansen et al, 2002). The negative Ce anomalies for some of the CMG, HXG and IDG may result from inheritance to those of the host metasedimentary rocks and from somewhat weathering (oxidation) of the granitoids.…”

Section: Fig 10 Chondrite-normalized Ree Diagram For: (A) the Metasmentioning

confidence: 99%

Geochemical constraints on the petrogenesis of the Middle Miaoershan granitoids,South China

Min

Luo

Li³

et al. 2003

Geochem. J.

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The Middle Miaoershan batholith in South China is one of the best examples of a composite granitic complex, comprising coarse-grained, porphyritic, biotite monzogranites, quartz monzonites, and mediumand fine-grained two-mica granites, formed respectively during the Caledonian, Hercynian, Indosinian and Yanshanian tectonic activity. This is confirmed by radiometric (Rb-Sr, U-Pb, and K-Ar) isotopic ages of 368, 296, 214, and 120 Ma, respectively. Chondrite-normalized (N) rare earth element (REE) abundance patterns for the granitoids are heterogeneous with (La/Yb) N between 5.75 and 14.38, variably negative Eu anomalies (Eu/Eu* = 0.24-0.80), and overall patterns similar to those of the host metasedimentary rocks. With respect to the old intrusive unit (CMG), the three young intrusive units (HXG, IDG and YG) possess generally lower ∑REE and Zr abundances, and larger negative Eu anomalies, indicating that they may be partially derived from re-melting of the CMG; plagioclase, zircon, and LREE-bearing accessory phases remained in the source during this partial re-melting of the CMG. δ18 O values for all of the granitoids are relatively uniform at 10.12 to 12.99, with a mean of 11.36. The lead isotopes for K-feldspar from the granitoids have a limited variation both within and between massifs, and all of the sample points fall near the upper crust growth curve in a 207 Pb/ 204 Pb vs. 206 Pb/ 204 Pb plot, indicating derivation from supracrustal sources for rock lead and rock-forming material.The Caledonian Miaoershan granitoids (CMG), however, are proposed to have had a supracrustal metasedimentary source mixed with a minor component of infracrustal derivation, resulting in a relatively low initial ( 87 Sr/ 86 Sr) i value (0.70761) and ASI (<1.0). The presence of inherited zircon as ancient core relicts within young magmatic zircons in the CMG shows that partial melting of crustal material, dominantly of metasedimentary origin, combined with re-melting of the granitoids formed by previous partial melting episodes, may be the dominant processes in the genesis of the granitoids. Limited variations of their chemical compositions and Sr, Pb isotopes among different massifs are probably related to the provenance of their source materials.

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Crustal melting in the lower parts of island arcs: an example from the Bremanger Granitoid Complex, west Norwegian Caledonides

Cited by 49 publications

References 69 publications

Early Silurian mafic–ultramafic and granitic plutonism in contemporaneous flysch, Magerøy, northern Norway: U–Pb ages and regional significance

Early Silurian mafic–ultramafic and granitic plutonism in contemporaneous flysch, Magerøy, northern Norway: U–Pb ages and regional significance

Evolution of late Cenozoic magmatism and the crust–mantle structure in the NE Japan Arc

Geochemical constraints on the petrogenesis of the Middle Miaoershan granitoids,South China

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