Blar i Institutt for geovitenskap og petroleum på tittel
Viser treff 1394-1413 av 2583
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Machine learning: A useful tool in geomechanical studies, a case study from an offshore gas field
(Peer reviewed; Journal article, 2020)For a safe drilling operation with the of minimum borehole instability challenges, building a mechanical earth model (MEM) has proven to be extremely valuable. However, the natural complexity of reservoirs along with the ... -
Magma hybridization in the middle crust: Possible consequences for deep-crustal magma mixing
(Journal article; Peer reviewed, 2012)The 465 Ma Svarthopen pluton in north-central Norway was emplaced under middle-crustal conditions (∼700 MPa) into metasedimentary rocks of the Helgeland Nappe Complex. The pluton is characterized by zones of mingling and ... -
Magma-driven, high-grade metamorphism in the Sveconorwegian Province, southwest Norway, during the terminal stages of Fennoscandian Shield evolution
(Journal article; Peer reviewed, 2018)Recently it has been argued that the Sveconorwegian orogeny in southwest Fennoscandia comprised a series of accretionary events between 1140 and 920 Ma, behind a long-lived, active continental margin characterized by ... -
Magmatic evolution of the Gállojávri ultramafic intrusion, Norway: Implicaitons for the formation of magmatic sulphide deposits in the Karasjok Greenstone Belt
(Doctoral theses at NTNU;2023:75, Doctoral thesis, 2023) -
Magmatiske malmdannende prosesser i Reinfjord, Seiland magmatiske provins: En studie av kjemisk sammensetning av olivin i forbindelse med ultramafisk magmatisk aktivitet
(Master thesis, 2013)En systematisk petrografisk og geokjemisk analyse av olivin i Reinfjord (Troms) blir her gitt.Oppgaven har til hensikt å øke forståelsen geologien i Reinfjord og de ultramafiske bergartene spesielt. Det vil bli fokusert ... -
The Magnetic and Mineralogical Properties of the Stardalur Volcano, Iceland
(Master thesis, 2016)The Stardalur volcano is located 20 km northeast of Reykjavik on the Esja Peninsula, Iceland. The volcano consists of Quaternary lavas which have revealed a high magnetic anomaly in both ground- and aeromagnetic surveying, ... -
Magnetic anomalies of the mafic/ultramafic seiland igneous province
(Journal article; Peer reviewed, 2018)The Ediacaran Seiland Igneous Province (SIP) is the largest complex of mafic-ultramafic intrusions in northern Fennoscandia and one of the few examples of a well preserved deep-seated magmatic plumbing system. The major ... -
Magnetic mapping of fault zones in the Leka Ophiolite Complex, Norway
(Peer reviewed; Journal article, 2020)The island of Leka and surrounding skerries expose a complete suite of ophiolitic rocks, which are heavily faulted. Large areas consist of ultramafic rocks, which are locally hydrated and form serpentinites. Faults are ... -
Magnetic Mineralogy and Petrophysical Properties of Ultramafic Rocks: Consequences for Crustal Magnetism
(Journal article; Peer reviewed, 2019)Magnetic properties from the Reinfjord Ultramafic Complex, in northern Norway, which formed as part of a deep magmatic conduit system, have been investigated to determine the magnetic signature of ultramafic rocks now ... -
Magnetic petrology of the Devonian Achala Batholith, Argentina: titanohaematite as an indicator of highly oxidized magma during crystallization and cooling
(Journal article; Peer reviewed, 2008)Devonian magmatism in the Eastern Sierras Pampeanas (Córdoba, Argentina) is represented by elliptical, porphyritic, batholithic, late- to post-orogenic monzogranites emplaced in a metamorphic—plutonic basement. Two groups ... -
Magnetic phases in hemo-ilmenite: Insight from low-velocity and high-field Mössbauer spectroscopy
(Journal article; Peer reviewed, 2007)[1] We have studied natural samples of hemo‐ilmenite (ilmenite with hematite exsolution lamellae) by use of Mössbauer spectroscopy. The samples are from the Allard Lake intrusion in Quebec. The stoichiometric compositions ... -
Magnetic properties and potential field modeling of the Peculiar Knob metamorphosed iron formation, South Australia: An analog for the source of the intense Martian magnetic anomalies?
(Journal article; Peer reviewed, 2007)[1] Magnetic property measurements show that the strongly metamorphosed Peculiar Knob iron formation (IF), South Australia, is coarse‐grained, high‐grade hematite with variable amounts of magnetite and maghemite. This body ... -
Magnetic properties of anorthosites: A forgotten source for planetary magnetic anomalies?
(Journal article; Peer reviewed, 2008)[1] Anorthosites, igneous rocks very rich in plagioclase, rarely considered to be strongly magnetic, are common on Earth, and the Moon, and inferred to be on other planets. Magnetic properties of anorthosites could be ... -
Magnetic susceptibility of sedimentary rocks from Bjørnøya
(Master thesis, 2012)Magnetic susceptibility of sedimentary rocks from Bjørnøya -
Magnetism at Depth: A View from an Ancient Continental Subduction and Collision Zone
(Journal article; Peer reviewed, 2018)Recent sophisticated global data compilations and magnetic surveys have been used to investigate the nature of magnetization in the lower crust and upper mantle. Two approaches to constraining magnetizations are developed, ... -
Magnetization of exsolution intergrowths of hematite and ilmenite: Mineral chemistry, phase relations, and magnetic properties of hemo-ilmenite ores with micron- to nanometer-scale lamellae from Allard Lake, Quebec
(Journal article; Peer reviewed, 2007)[1] Hemo‐ilmenite ores from Allard Lake, Quebec, were first studied over 50 years ago. Interest was renewed in these coarsely exsolved oxides, based on the theory of lamellar magnetism as an explanation for the high and ... -
Main aspects of deformation and rock support in Norwegian road tunnels
(Journal article; Peer reviewed, 2019)The general geology of Norway makes most of its tunnels to be constructed mainly in strong rock intersected by weakness zones of different sizes and characteristics. The Norwegian support tradition is, to the largest degree ... -
Maintaining well integrity during slot recovery operations
(Master thesis, 2012)The temporary plug and abandonment (P&A) of old wells, and the following slot recovery, will be important for increasing the average rate of recovery from the Norwegian Continental Shelf (NCS). However, these operations ... -
Maintenance And Renewal Optimization Of Electric Power Supply In Railways
(Master thesis, 2010)This report is written for JBV (Norwegian Railway Administration). The motivation for this topic arose from deteriorating electric power converter station. The impact of failure is in terms of train cancelations and delays. ... -
Managed Pressure Cementing - Simulations of Pressure and Flow Dynamics During Cementing Using Applied Back-Pressure and Dual Gradient
(Master thesis, 2017)Cement operations in narrow pressure windows can be challenging, due to the increased hydrostatic pressure caused by heavy-weight cement. Through managed pressure control, downhole pressure fluctuations can be controlled, ...