Was the Precambrian Basement of Western Troms and Lofoten-Vesterålen in Northern Norway Linked to the Lewisian of Scotland? A Comparison of Crustal Components, Tectonic Evolution and Amalgamation History"

Bergh, Steffen G.; Corfú, Fernando; Myhre, Per Inge; Kullerud, Kåre; Armitage, Paul E.B.; Zwaan, K.B.; Ravna, Erling J. Krogh; Holdsworth, R. E.; Chattopadhya, A. K.

doi:10.5772/48257

Cited by 7 publications

(2 citation statements)

References 89 publications

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“…It is anticipated that the Lofoten offshore basement will also be metamorphic and tonalitegranodiorite dominated, as the onshore archipelago is dominated by Neoarchean-Paleoproterozoic gneisses and plutons of this composition (Wilson et al 2006;Bergh et al 2012). The plutons are charnokitic and the preservation of orthopyroxene formed due to the overprinting high-grade metamorphism is in some ways similar to the metatonalites at Lancaster.…”

Section: Basement Composition and Implications For Fracture Developmentmentioning

confidence: 99%

Fractured basement play development on the UK and Norwegian rifted margins

Trice¹,

Hiorth²,

Holdsworth³

2019

Geological Society, London, Special Publications

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Fractured crystalline basement reservoirs (basement) on the UK Continental Shelf (UKCS) and the Norwegian Continental Shelf (NCS) have been underexplored. Over the last 12 years, Hurricane Energy has deliberately set out to explore basement potential by exploring and appraising the Rona Ridge, West of Shetland; and the Rona Ridge Lancaster Field is now being progressed towards being the first UK basement field development. The Norwegian basement play is also recognized as a potentially material resource through serendipitous oil discoveries, with the 16/1-15 well, drilled in 2011, being the first successful full-scale basement test on the NCS. Building on this success, the 2018 Rolvsnes appraisal well (16/1-28 S) has demonstrated the significant basement potential of the extensive Utsira High and confirmed the materiality of a Norwegian basement play. The Rona Ridge and Utsira basement discoveries are used as a comparison with two other, yet to be evaluated, prospective basement plays on the NCS, with the objective of establishing technical subject areas where future UKCS and NCS collaboration would aid in accelerating understanding of the UKCS-NCS basement play.

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Section: Basement Composition and Implications For Fracture Developmentmentioning

confidence: 99%

Fractured basement play development on the UK and Norwegian rifted margins

Trice¹,

Hiorth²,

Holdsworth³

2019

Geological Society, London, Special Publications

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“…(a) Simplified regional geological map of South Norway (afterBergh et al, 2012) indicating the Modum complex(Jøsang, 1966) location (black star) within the Kongsberg-Modum region. (b) Hand-sample picture showing the magnesite-serpentine in light green and the magnetite in black.…”

mentioning

confidence: 99%

Multistep Parametric Inversion of Scanning Magnetic Microscopy Data for Modeling Magnetization of Multidomain Magnetite

Pastore

Church

McEnroe

2019

Geochem Geophys Geosyst

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Development in instrumentation and technology now allows for mapping of magnetic anomalies, caused by spatial variations in magnetization in the source material, from the mineral to the crustal anomalies scale. High‐resolution magnetic mapping techniques allow for accurate investigation of the magnetization in natural rock samples and particularly of their remanence carriers, which can record geologically meaningful information. Multidomain magnetic grains are expected to retain a remanence that is susceptible to change by exposure to magnetic fields or by changes in temperature. Although this makes multidomain grains less reliable remanence carriers for paleomagnetic studies, their magnetization contributes to rocks bulk magnetization and to induced anomalies in the Earth crust. Here, we investigate the fine‐scale magnetization of a sample that exhibits a multidomain behavior. We used a scanning magnetic microscope, equipped with a room temperature magnetic tunnel junction sensor, to map the magnetic field over a petrographic thin section of the sample containing large magnetite grains (>100 μm) surrounded by serpentine and carbonate. We modeled the fine‐scale remanent magnetization of the magnetite by inverting the magnetic scans data acquired in near‐field‐free conditions. We applied a multistep inversion, a priori tested on a synthetic model, with a controlled range on the intensity of the magnetization. Modeling results on the study sample suggest homogenously magnetized regions within the magnetite grains with variable remanent magnetization intensities and directions coherent with the multidomain behavior inferred from bulk measurements.

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The Scandinavian Caledonides: main features, conceptual advances and critical questions

2014

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Thirty years of research, and especially the refinements of many geological, geochemical and geophysical techniques, have uncovered many new facets of the geology of the Scandinavian Caledonides, also correcting some fundamental misconceptions. Our present understanding is that of a sequence of allochthons, some derived from Baltica, but others of probably exotic origin, in part from the Laurentian margin that collided with Baltica, but perhaps also from other parts of Rodinia. The present paper summarizes the main features of the Scandinavian Caledonides, proposing some rethinking of the traditional schemes, which were developed lacking a substantial amount of the information we have today, and discusses the main advances since the last major synthesis in 1985.

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Was the Precambrian Basement of Western Troms and Lofoten-Vesterålen in Northern Norway Linked to the Lewisian of Scotland? A Comparison of Crustal Components, Tectonic Evolution and Amalgamation History"

Cited by 7 publications

References 89 publications

Fractured basement play development on the UK and Norwegian rifted margins

Fractured basement play development on the UK and Norwegian rifted margins

Multistep Parametric Inversion of Scanning Magnetic Microscopy Data for Modeling Magnetization of Multidomain Magnetite

The Scandinavian Caledonides: main features, conceptual advances and critical questions

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