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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 ULg; 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 ULg; 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 ULg; Trindade, Ricardo I.F.; Diot, Hervé et al

Conference (2002)

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See detailImaging downward granitic magma transport in the Rogaland Igneous Complex, SW norway
Bolle, Olivier ULg; Trindade, Ricardo I.F.; Bouchez, Jean-Luc et al

in Terra Nova (2002), 14(2), 87-92

Combining geological mapping and petrological, structural and geophysical (gravity and seismic) data already available for the late Proterozoic Rogaland Igneous Complex of Norway allows the 3D shape of ... [more ▼]

Combining geological mapping and petrological, structural and geophysical (gravity and seismic) data already available for the late Proterozoic Rogaland Igneous Complex of Norway allows the 3D shape of the Bjerkreim-Sokndal layered intrusion to be modelled as a thick cumulate series capped by massive granitic rocks. Using the latter data, along with the spectacular convergent linear flow pattern that covers both the cumulates and the felsic rocks of this chamber, evidence is presented to show that the granitic material was down-dragged through the sinking of its high-density mafic floor into lower density anorthosites and granulitic gneisses. This example illustrates that downward gravity-driven flows of rocks were active, in addition to upward flows, in the building of the early crust up to late-Proterozoic times, helping to explain the geochemical and structural complexities of the old crust. [less ▲]

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See detailThe Rogaland intrusive massifs: eastern part
Duchesne, Jean-Clair ULg; Demaiffe, Daniel; Bolle, Olivier ULg et al

in Duchesne, Jean-Clair (Ed.) The Rogaland intrusive massifs: an excursion guide (2001)

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See detailEmplacement mechanism of the Tellnes ilmenite deposit (Rogaland, Norway) revealed by a combined magnetic and petrofabric study
Bolle, Olivier ULg; 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 detailRemanence anisotropy: methodological analysis and examples from plutonic rocks
Trindade, Ricardo I.F.; Bolle, Olivier ULg; Bouchez, Jean-Luc

in Geophysical Research Abstracts (2001), 3

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See detailThe jotunitic and the acidic igneous rocks
Vander Auwera, Jacqueline ULg; Bolle, Olivier ULg; Duchesne, Jean-Clair ULg

in Duchesne, Jean-Clair (Ed.) The Rogaland Intrusive Massifs: an excursion guide (2001)

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See detailSecondary fabrics revealed by remanence anisotropy: methodological study and examples from plutonic rocks
Trindade, Ricardo I.F.; Bouchez, Jean-Luc; Bolle, Olivier ULg et al

in Geophysical Journal International (2001), 147(2), 310-318

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

in Journal of Conference Abstracts (1999), 4

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

in Documents du BRGM (1999), 290

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See detailMagmatic intrusion and mineralization along a strike-slip fault into the Åna-Sira anorthosite: the Tellnes case, Rogaland, Norway
Diot, Hervé; Lambert, Jean-Marc; Bolle, Olivier ULg et al

in Documents du BRGM (1999), 290

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See detailCharnockites: the lower crust connection
Duchesne, Jean Clair; Vander Auwera, Jacqueline ULg; Bolle, Olivier ULg

in Documents du BRGM (1999), 290

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See detailAnisotropy of Magnetic Susceptibility (AMS) study of deformation in the Bjerkreim-Sokndal layered intrusion (Rogaland, Southwest Norway)
Bolle, Olivier ULg; Diot, Hervé; Duchesne, Jean-Clair ULg

in Nordgulen, Øystein; Padget, Peter; Robinson, Peter (Eds.) et al COPENA conference at NGU, August 18-22, 1997: Abstract and Proceedings (1997)

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