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See detailPluton construction and deformation in the Sveconorwegian crust of SW Norway: magnetic fabric and U-Pb geochronology of the Kleivan and Sjelset granitic complexes
Bolle, Olivier ULiege; Diot, Hervé; Vander Auwera, Jacqueline ULiege et al

in Precambrian Research (2018), 305

The Kleivan and Sjelset granitic complexes are two composite plutons, containing both orthopyroxene and biotite (± hornblende) facies, emplaced in the Sveconorwegian (Grenvillian) high-grade basement of ... [more ▼]

The Kleivan and Sjelset granitic complexes are two composite plutons, containing both orthopyroxene and biotite (± hornblende) facies, emplaced in the Sveconorwegian (Grenvillian) high-grade basement of SW Norway. A structural study of these two plutons, based on the anisotropy of magnetic susceptibility (AMS) technique and combined with high-precision U-Th-Pb zircon dating, is presented here. Geochronological data demonstrate a rapid emplacement of successive magmatic pulses in the Kleivan complex (from 936.94 ± 0.42 Ma to 935.62 ± 0.67 Ma) and, on the contrary, a non-negligible rest period (~3.2 Ma) in the construction of the Sjelset complex that was formed by two pulses emplaced, respectively, at 935.67 ± 0.37 Ma and 932.43 ± 0.75 Ma. Locally discordant magnetic fabrics in the latter pluton confirm this rather protracted construction time. Thermomagnetic and hysteresis measurements supporting the AMS data indicate a magnetic mineralogy dominated by a multidomain, Ti-poor titanomagnetite, except in samples having a very low magnetic susceptibility. The susceptibility magnitudes, paramagnetic to ferromagnetic in agreement with the rock magnetic data, rely on the petrographic rock-types and on the alteration degree. Image analysis confirms that the magnetic fabric is usually coaxial with the shape fabric in both complexes, supporting the use of AMS as a proxy for the petrofabric orientation. Combined with micro- and macrostructural data, the magnetic fabric demonstrates that the Kleivan and Sjelset granitic complexes have their internal fabrics largely dominated by tectonic strain. Models of synfolding emplacement coeval with the last stage of Sveconorwegian contraction recorded in the area are proposed for the two plutons. [less ▲]

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See detailSubsidence in the Sept Iles layered intrusion (Canada) revealed by anisotropy of magnetic susceptibility
Bolle, Olivier ULiege; Diot, Hervé; Fransen, William ULiege et al

Conference (2016, September 06)

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See detailMagma flow and feeder chamber location inferred from magnetic fabrics in jotunitic dykes (Rogaland anorthosite province, SW Norway)
Bolle, Olivier ULiege; Besse, Michal; Diot, Hervé

in Tectonophysics (2010), 493(1-2), 42-57

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See detailAnisotropy of magnetic susceptibility in the Farsund charnockite (Southern Norway) reveals late-Sveconorwegian strike-slip ductile shearing
Bolle, Olivier ULiege; Diot, Hervé

in AGC/GAC – AMC/MAC – SEG – SGA Abstract Volume (2008), 33

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See detailMagnetic fabrics in jotunite dykes from the Late-Proterozoic Rogaland anorthosite province (SW Norway)
Bolle, Olivier ULiege; Besse, Michal; Diot, Hervé

in Geophysical Research Abstracts (2005), 7

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See detailMagnetic fabrics in the Holum granite (Vest-Agder, southernmost Norway): implications for the late evolution of the Sveconorwegian (Grenvillian) orogen of SW Scandinavia
Bolle, Olivier ULiege; Diot, Hervé; Trindade, Ricardo I.F.

in Geophysical Research Abstracts (2003), 5

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See detailMagnetic fabrics in the Holum granite (Vest-Agder, southernmost Norway): implications for the late evolution of the Sveconorwegian (Grenvillian) orogen of SW Scandinavia
Bolle, Olivier ULiege; Diot, Hervé; Trindade, Ricardo I.F.

in Precambrian Research (2003), 121(3-4), 221-249

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See detailThe Tellnes ilmenite deposit (Rogaland, South Norway): magnetic and petrofabric evidence for emplacement of a Ti-enriched noritic crystal mush in a fracture zone
Diot, Hervé; Bolle, Olivier ULiege; Lambert, Jean-Marc et al

in Journal of Structural Geology (2003), 25(4), 481-501

The Tellnes ilmenite deposit, a world class titanium deposit, occurs in the Ana-Sira anorthosite (Rogaland anorthosite province, South Norway). It is mainly made up of an ilmenite-rich norite that has ... [more ▼]

The Tellnes ilmenite deposit, a world class titanium deposit, occurs in the Ana-Sira anorthosite (Rogaland anorthosite province, South Norway). It is mainly made up of an ilmenite-rich norite that has been previously interpreted as injected in a crystal mush state, in a weakness zone of the enclosing anorthosite. This emplacement mechanism has produced a faint orientation in the ore due to the flow of the mush. The internal flow structure of the orebody is studied here using the low-field anisotropy of magnetic susceptibility (AMS) method. Partial anhysteretic remanent magnetization (pAARM) indicates that coarse magnetite is the main mineral responsible for the magnetic fabric. Parallelism of the magnetic fabric with the shape-preferred orientation of the ore-forming minerals is checked using image analysis (IA) from oriented sections (intercept method). Interpretation of the AMS data verified by pAARM and IA, provides information on the magmatic foliation and lineation. Emplacement flow of the ilmenite norite crystal mush occurred in the direction of the orebody, parallel to its walls, and with an average SE 18degrees plunge. The feeder zone was likely situated below a network of veins on the SE end of the orebody. The sickle-shaped outcrop of the deposit suggests a transcurrent, dextral opening of a WNW-ESE-striking weakness zone across the anorthosite pluton. (C) 2002 Elsevier Science Ltd. All rights reserved. [less ▲]

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See detailImaging downward granitic magma transport in the Rogaland anorthosite province, SW Norway
Bolle, Olivier ULiege; Trindade, Ricardo I.F.; Diot, Hervé et al

Conference (2002)

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See detailEmplacement mechanism of the Tellnes ilmenite deposit (Rogaland, Norway) revealed by a combined magnetic and petrofabric study
Bolle, Olivier ULiege; Diot, Hervé; Lambert, Jean-Marc et al

in Korneliussen, (Ed.) Abstracts – GEODE field workshop 8-12th July 2001 on ilmenite deposits in the Rogaland anorthosite Province, S. Norway (2001)

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See detailGravity induced tectonics in charnockitic rocks: the Bjerkreim-Sokndal massif (Rogaland, Southwest Norway)
Bolle, Olivier ULiege; Diot, Hervé; Duchesne, Jean-Clair ULiege

in Journal of Conference Abstracts (1999), 4

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See detailGravity induced tectonics in the Rogaland anorthositic province, Southwest Norway
Bolle, Olivier ULiege; Diot, Hervé; Barnichon, Jean-Dominique et al

in Documents du BRGM (1999), 290

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