Trine-Lise Knudsen Gørbitz

• Andersen, Tom; Griffin, W.L.; Jackson, S.E.; Knudsen, Trine-Lise & Pearson, N.J. (2004). Mid-Proterozoic magmatic arc evolution at the southwest margin of the Baltic Shield. Lithos. ISSN 0024-4937. 73, s. 289–318. Fulltekst i vitenarkiv
• Andersen, Tom; Griffin, Wiiliam L.; Jackson, S.E.; Knudsen, Trine-Lise & Pearson, Norman J. (2004). Mid-Proterozoic magmatic arc evolution at the soutwest margin of the Baltic Shield. Lithos. ISSN 0024-4937. 73, s. 289–318. Fulltekst i vitenarkiv
• Johansen, Bjørn Vidar; Knudsen, Trine-Lise & Haugen, Synnøve (2004). Når gamle museer får ny skrud. Memento. ISSN 1503-8572. s. 28–30. Fulltekst i vitenarkiv
• Knudsen, Trine-Lise; Griffin, Wiiliam L.; Hartz, Ebbe Hvidegård; Andresen, Arild & Jackson, S.E. (2001). In-situ hafnium and lead isotope analyses of detrital zircons from the Devonian sedimentary basin of NE Greenland; a record of repeated crustal reworking. Contributions to Mineralogy and Petrology. ISSN 0010-7999. 141, s. 83–94. Fulltekst i vitenarkiv
• Knudsen, Trine-Lise (2001). Contrasting provenance of Triassic/Jurassic sediments in North Sea Rift: A single zircon (SIMS), Sm-Nd and trace element study. Chemical Geology. ISSN 0009-2541. 171, s. 273–293. Fulltekst i vitenarkiv Vis sammendrag

  An ion-microprobe (SIMS) U-Pb zircon study has been performed on a selection of five samples in order to identify the various provenances of sands/sandstones from the Lunde and Statfjord Formations, the Gullfaks Oilfield. The data are integrated with Sr element analyses and new and published Sm-Nd whole rock data, which give consistent and additional information in this geologically complex area. Previous work has shown that the upper parts of the Lunde Formation have relatively low Nd model ages (typically 1.5 to 1.6 Ga), reflecting stable tectonic conditions. The overlying Raude and Eirikson Members of the Statfjord Formation record interfingering units recording relatively low (1.5 Ga) and substantially higher Nd model ages. This may reflect an early stage of rifting in the Northern North Sea Rift Zone, while the upper Nansen Member represents a return to relatively low, uniform Nd ages and quiet tectonic conditions. The present data reveal a more complex interplay between sediment provenance terranes than previously assumed. The sample of the Lunde Fm is characterised by a high number of zircon age peaks at 0.39 to 1,75 Ga. It was transported from the South and has an (ultimate) provenance in the SW margin of Norway after the mid-Devonian. The Eirikson #1 sample with tDM of 2.4 Ga, represents the income of units with substantially higher Nd model ages. A prominent peak of Archaean zircons at 2.56 to 3.00 Ga, reflects a sediment source in Archaean gneisses which were located in the North. Smaller peaks at 0.38 to 0.54 Ga and 1.10 to 1.90 Ga represent a separate provenance component in the East Shetland Platform. The Raude and Eirikson #2 samples have tDM of 1.7 and 1.8 Ga and show a cumulative zircon peak at 0.38 to 0.46 Ga and a high number of small peaks in the age ranges 0.70 to 2.23 Ga and 2.40 to 3.00 Ga. These units where transported from the South, and have an ultimate provenance in the East Shetland Platform. The sample of the Nansen Fm records a peak of zircon ages at 1.58 to 1.74 Ga, was derived from the South and represents re-cycled Devonian sediments from SW Norway. The four samples derived from the South, may have experienced sediment- redeposition. Of these, the Nansen sample is the best example of a sediment sequence which has been preserved and transported as an isolated unit through erosion, sediment transport and re-deposition. There is a perfect match between the geochemistry of this sample and Devonian sediments from SW Norway, suggesting subordinate contamination from other provenance terranes during sedimentation and sediment re-deposition. This suggests that provenance studies of Devonian sediments from the North Sea area are important for an understanding of the ultimate source areas and processes of sediment re-deposition in the younger rift.

• Knudsen, Trine-Lise & Fossen, Haakon (2001). The Late Jurassic Bjorøy Formation: A provenance indicator for offshore sediments derived from SW Norway as based on single zircon (SIMS) data. Norsk Geologisk Tidsskrift. ISSN 0029-196X. 81, s. 283–292. Fulltekst i vitenarkiv Vis sammendrag

  The Late Jurassic Bjorøy Formation is located in a fracture zone in granodioritic gneisses of the Øygarden Complex in the Bergen area, SW Norway. An ion-microprobe (SIMS) U-Pb zircon study has been performed on a sand sample and the granitic basement, and the data are integrated with Nd and Sr whole rock isotopes in order to identify the provenance components to the Bjorøy Fm. The detrital zircons reflect a source area that was dominated by rocks with zircon ages in Caledonian (450 and 520 Ma), Sveconorwegian (900 to 1010 Ma) and mid-Proterozoic (ca. 1450 Ma) times. One Archaean zircon at ca. 2700 Ma is recorded. The sand sample has a relatively low Nd model age of 0.5 Ga, which can be connected to an important sediment source in Caledonian rocks of intermediate and mafic compositions. These were probably derived from units related to the Minor and Major Bergen Arcs. Thus, rocks of the Upper Allochthon of the Caledonides were probably important in the sediment source area together with Proterozoic gneisses and late-Proterozoic platform sediments, which appear as tectonically intercalated slivers in the upper allochthonous units. Ordovician sediments in the provenance may explain the elevated time-corrected Sr isotope composition of the Bjorøy Fm, but it cannot be excluded that this signature is a result of interaction with seawater and/or crustal fluids during and after sediment deposition. The Bjorøy sand gives a zircon age signature of SW Norway in Mesozoic times. This is important since offshore sands with distinctly different zircon age distributions have previously been connected to a source in SW Norway.

• Andersen, Tom & Knudsen, Trine-Lise (2000). Rifting of a composite continent: Radiogenic isotope characteristics of dominant crustal componnts in the Oslo Rift area, S. Norway (abstract). Geonytt. ISSN 0802-6173. 1, s. 29–29. Fulltekst i vitenarkiv
• Andersen, Tom & Knudsen, Trine-Lise (2000). Crustal contaminants in the Permian Oslo Rift, South Norway: Constraints from Precambrian geochemistry. Lithos. ISSN 0024-4937. 53, s. 247–264. Fulltekst i vitenarkiv
• Knudsen, Trine-Lise (2000). The provenance of Devonian sandstones from Shetland: a Sm-Nd and trace element study. Scottish Journal of Geology. ISSN 0036-9276. 36, s. 61–72. Fulltekst i vitenarkiv
• Knudsen, Trine-Lise & Andersen, Tom (1999). Petrology and geochemistry of the Tromøy gneiss complex, South Norway, an alleged example of Proterozoic depleted lower continental crust. Journal of Petrology. ISSN 0022-3530. s. 909–933. Fulltekst i vitenarkiv Vis sammendrag

  A granulite-facies Precambrian meta-igneous gneiss complex at Tromøy, South Norway, which was previously assumed to represent a fragment of strongly LILE-depleted lower continental crust, has been re-investigated using major and trace element data, radiogenic isotopes and SIMS U-Pb geochronology. The Tromøy gneiss complex consists of mafic and tonalitic gneisses (SiO2=60 to 70 wt%) which are intruded by trondhjemitic dykes (SiO2>70 wt%). The mafic and tonalitic members are metaluminous, low-K rocks which have characteristic negative spikes for niobium and positive spikes in lead, are moderately enriched in middle REE/LREE and have relatively flat middle to HREE patterns. Their compositions resemble evolved magmas in modern oceanic island arcs. The trondhjemites have major element compositions close to minimum melts in either mafic or tonalitic systems. They display low LILE and LREE contents, with high K/Rb (up to >13000), their REE patterns are concave in the middle to HREE and have a positive Eu anomaly. SIMS U-Pb analyses of zircons from the mafic gneiss, tonalite and one trondhjemite suggest three different episodes of zircon growth: (1) oscillatory zoned magmatic cores at 1198?13 Ma (2s); (2) metamorphic overgrowths at 1125?23 Ma (2s); and (3) later fluid-controlled embayments and paths of zircon reworking. The mafic gneisses and tonalites have indistinguishable magmatic ages. The trondhjemites originated as anatectic melts in the mafic-tonalitic rock complex during high-grade metamorphism at 1100 Ma, their most likely source was a leucogabbroic or dioritic facies within the igneous complex. Nd, Sr and Pb isotope data suggest involvement of mantle- and crustally derived source components in the petrogenesis of the gneiss protolith, most likely in a subduction-zone setting. The present data show that the Tromøy gneiss complex is not a typical example of "depleted lower continental crust", nor has it been highly metasomatized or severely depleted by metamorphic fluids.

• Knudsen, Trine-Lise; Andersen, Tom; Whitehouse, Martin & Vestin, Jessica (1997). Detrital zircon ages from southern Norway - implications for the Proterozoic evolution of the southwestern Baltic Shield. Contributions to Mineralogy and Petrology. ISSN 0010-7999. 130, s. 47–58. Fulltekst i vitenarkiv Vis sammendrag

  An ion-microprobe (SIMS) U-Pb zircon dating study on four samples of Precambrian metasediments from the high-grade Bamble Sector, southern Norway, gives the first information on the timing of discrete crust-forming events in the SW part of the Baltic Shield. Recent Nd and Pb studies have indicated that the sources of the clastic metasediments in this area have crustal histories extending back to 1.7 to 2.1 Ga, although there is no record of rocks older than 1.6 Ga in southern Norway. The analysed metasediments are from a sequence of intercalated, centimetre to 10-metre wide units of quartzites, semi-metapelites, metapelites and mafic granulites. The zircons can be grouped in two morphological populations: (1) long prismatic and (2) rounded, often flattened. BSE images reveal that both populations consist of oscillatory zoned, rounded and corroded cores (detrital grains of magmatic origin), surrounded by homogenous rims (metamorphic overgrowths). The detrital zircons have 207Pb/206Pb ages between 1367 and 1939 Ma, with frequency maxima in the range 1.85 to 1.70 Ga and 1.60 to 1.50 Ga. There is no correlation between crystal habit and age of the zircon. One resorbed, inner zircon core in a detrital grain is strongly discordant and gives a composite inner core- magmatic outer core 207Pb/206Pb age of 2383 Ma. Two discrete, unzoned zircons have 207Pb/206Pb ages of 1122 and 1133 Ma, representing zircon growth during the Sveconorwegian high-grade metamorphism. Also the mm wide overgrowths, embayments in the detrital cores and apparent "inner cores" which represent secondary metamorphic zircon growth in deep embayments in detrital grains, are of Sveconorwegian age. The composite detrital - metamorphic zircon analyses give generally discordant 206Pb/238U vs. 207Pb/235U ratios and maximum 207Pb/206Pb ages of 1438 Ma. These data demonstrate the existence of a protocrust of 1.7 to 2.0 Ga in the southwestern part of the Baltic Shield, implying a break in the overall westward younging trend of the Precambrian crust, inferred from the southeastern part of the Baltic Shield.

• Knudsen, Trine-Lise; Andersen, Tom; Maijer, Cees & Verschure, Rob (1997). Trace element characteristics and Pb-isotopic evolution of metasediments and associated Proterozoic rocks from the amphibolite to granulite facies Bamble Sector, southern Norway. Chemical Geology. ISSN 0009-2541. 143, s. 145–169. Fulltekst i vitenarkiv Vis sammendrag

  A study of trace-element distribution and Rb/Sr-, Sm/Nd- and Pb-isotopic compositions has been performed on amphibolite and granulite facies metasediments, mafic granulites, dioritic gneiss, intrusive enderbitic veins and calc-alkaline tonalitic gneisses from the Proterozoic Bamble Sector, southern Norway. The LILE-content of the granulite facies metapelites is similar to the average of the upper crust and post-Archaean average shales. The K/Rb-ratios of the amphibolite and granulite facies semipelites and impure quartzites are similar, and the K/Rb-ratios of the metapelites show overall similarities to the ratios of undepleted metapelites (<300). There is evidence of incomplete Sveconorwegian correlations in the Rb-Sr isotopic system, and a poor correlation in the Sm-Nd system. The calculated tDM model ages for the metasediments can represent crustal residence times of 1.67 to 2.05 Ga. The present-day lead isotopic data can be reproduced by a three-stage model of Pb-evolution in which (t0 = 4.57 Ga, t1 = 1.9 or 1.5 Ga, t2 = 1.1 Ga, m1 (238U/204Pb) = 7.9, k1 (232Th/238U) = 2.5, k2# 4.15), where t1 and t2 are related to separation from the mantle and the Sveconorwegian orogeny, respectively. The protolith of the metasediments, the dioritic gneiss and the mafic granulites evolved in high U/Pb environments prior to Sveconorwegian times (m2 = 16-32, 19 and 18-45, respectively). Most of these rock units experienced conditions of m2 > m3 and k2 < k3, suggesting a large-scale fractionation in the U-Th-Pb system connected to U- mobility during the medium to high grade metamorphism. There are no unambiguous differences in the Pb isotopic composition between the amphibolite and granulite facies rocks, but the mafic granulites from the classical "depleted granulite" area of Tromøy island evolved in overall lower m2 (238U/204Pb) environments , than similar rocks from the neigbouring Hisøy island. This suggest that the similar U-content of these rocks largely can be due to local pre-Sveconorwegian 238U/204Pb variations. Sveconorwegian intrusive enderbitic dykes and veins crystallized with low LILE and Nb consentrations at granulite facies P-T-aCO2 conditions. Pre-Sveconorwegian granulite facies tonalitic gneisses show a less depleted trace-element patterns and low Nb concentrations and the hornblende-free tonalitic gneisses have significantly lower U-content than their hornblende-bearing counterparts. The investigated metasediments have very low contents of the less mobile elements Nb, Sr, Cu and P2O5, which probably represent characteristics of the pre-sedimentary protolith.

• Knudsen, Trine-Lise & Andersen, Tom (1997). Fluid inclusions in granulite facies metasediments from the proterozoic lower crut in the Hisøy-Torungen area, Bamble sector, Southern Norway. Proceedings from Moninklijke Nederlandse Akademie van Wettenschappen, Amsterdam. 100(1-2), s. 79–101. Fulltekst i vitenarkiv Vis sammendrag

  Thermodynamic modelling, fluid inclusion microthermometry and Raman spectroscopy has been performed on metasediments from the granulite facies Bamble Sector, southern Norway. The calculations suggest that the metapelites were in equilibrium with a fluid with CO2/H2O/CH4 = 76/24/8@10-3 (mole%) during the granulite facies (M2) metamorphism. Local variations in fluid inclusion composition suggest a strict, local control on the fluid composition during the metamorphic evolution of the metasediments; Brine, brine + CO2 and CO2 are characteristic fluid inclusions in impure quartzites and semi-metapelites, metapelites and migmatitized metapelites, respectively. Channelized influx of CO2-bearing brine at high-grade conditions explains the observed local partial melting. A systematic increase of XN2 in the carbonic inclusions coupled with decreasing density, suggests increased availability of nitrogen at retrograde (M3 to M4) conditions. The fluid inclusion densities do not match granulite facies P-T conditions: The first stage of the retrograde P-T evolution involved relatively rapid uplift, which together with isoclinal folding of the rocks, caused decrepitation and mobilization of the fluids along secondary fluid inclusion trails, but without any significant change in fluid composition.

• Knudsen, Trine-Lise & Lidwin, Arne (1996). Magmatic CO2, brine and nitrogen inclusions in Sveconorwegian enderbitic dehydration veins and a gabbro from the Bamble sector, Southern Norway. European journal of mineralogy. ISSN 0935-1221. 8, s. 1–23. Fulltekst i vitenarkiv
• Knudsen, Trine-Lise (1996). Petrology and geothermobarometry of granulite-facies metapelites from the Hisøy-Torungen area, South Norway: New data on the Sveconorvegian p-T-t path of the Bamble sector. Journal of Metamorphic Geology. ISSN 0263-4929. 14, s. 267–287. Fulltekst i vitenarkiv Vis sammendrag

  The high-grade rocks (metapelite, quartzite, metagabbro) of the Hisøy-Torungen area represent the southwesternmost exposures of granulites in the Proterozoic Bamble sector, South Norway. The area is isoclinally folded and a metamorphic p-T-t path through four successive stages (M1 to M4) can be recognized. Petrological evidence for a prograde metamorphic event (M1) is obtained from relict staurolite + chlorite + albite, staurolite + hercynite + ilmenite, cordierite + sillimanite, fine-grained felsic material + quartz and hercynite + biotite ± sillimanite within metapelitic garnet. The phase relations are consistent with a pressure of 3.6 ± 0.5 kbar and temperatures up to 750 - 850 oC. M1 is connected to the thermal effect of the gabbroic intrusions prior to the main (M2) Sveconorwegian granulite-facies metamorphism. The main M2 granulite-facies mineral assemblages (quartz + plagioclase + K?feldspar + garnet + biotite ± sillimanite) are best preserved in the several metre wide Al-rich metapelites, which represent conditions of 5.9-9.1 kbar and 790-884 oC. These p-T conditions are consistent with a temperature increase of 80 - 100oC relative to the adjacent amphibolite-facies terrains. No accompanying pressure variations are recorded. Up to one mm wide fine-grained felsic veinlets appear in several units and represent remnants of a former melt formed by the reaction: Bt+Sil+Qtz=>Grt+lq. This dehydration-reaction together with the absence of large-scale migmatites in the area, suggests a very reduced water-activity in the rocks and XH2O = 0.25 in the C-O-H fluid system has been calculated for a metapelitic unit. A low but variable water-activity can best explain the presence or absence of fine-grained felsic material representing a former melt in the different granulitic metapelites. The strongly peraluminous composition of the felsic veinlets is due to the reaction: Grt+former melt±Sil =>Crd+Bt±Qtz±H2O which has given poorly crystalline cordierite aggregates intergrown with well-crystalline biotite. The cordierite- and biotite-producing reaction constrains a steep first-stage retrograde (relative to M2) uplift path. Decimetre to metre wide, strongly banded metapelites (quartz + plagioclase + biotite + garnet ± sillimanite) interlayered with quartzites are retrograded to (M3) amphibolite-facies assemblages. A pressure-temperature estimate of 1.7-5.6 kbar, 516-581 oC is obtained from geothermobarometry based on rim-rim analyses of garnet - biotite - plagioclase - sillimanite - quartz assemblages, and can be related to the isoclinal folding of the rocks. M4 greenschist-facies conditions are most extensively developed in millimeter wide chlorite-rich, calcite-bearing veins cutting the foliation.

Se alle arbeider i NVA

• Gørbitz, Trine-Lise Knudsen (2015). Hvordan lykkes i internasjonal rekruttering - suksesskriterier og fallgruver. Fulltekst i vitenarkiv
• Gørbitz, Trine-Lise Knudsen (2014). Fremragende! Fulltekst i vitenarkiv
• Knudsen, Trine-Lise & Johansen, Bjørn Vidar (2004). Stein og stil. En guidet vandring om valg av materiale og kunstnerisk utsmykning i Oslo Rådhus. Fulltekst i vitenarkiv
• Bjureke, Kristina & Knudsen, Trine-Lise (2004). Natur og kultur på Hovedøya. Fulltekst i vitenarkiv
• Knudsen, Trine-Lise (2003). Temasending om hva som skjer når jordskorpen sprekker. [Radio]. Alltid nyheter. Fulltekst i vitenarkiv
• Knudsen, Trine-Lise (2003). Hva skjer når jorda revner? Eksempler fra Oslo-riften. Fulltekst i vitenarkiv
• Knudsen, Trine-Lise (2003). Oslofeltet � Norges svar på den Østafrikanske Rift. Fulltekst i vitenarkiv
• Knudsen, Trine-Lise (2003). Fra brudd til bygg, en suksessrik historie om norsk bergverksindustri. Fulltekst i vitenarkiv
• Røyri, Vibeke & Knudsen, Trine-Lise (2003). Opptak langs Kolsås-profilet for en sending viet rifting av jordskorpa. [Radio]. NRK P2 �Verdt å Vite spesial� . Fulltekst i vitenarkiv
• Knudsen, Trine-Lise & Johansen, Bjørn Vidar (2003). Osloriften - Hva skjer når jorda revner? Fulltekst i vitenarkiv
• Knudsen, Trine-Lise (2003). Et pilotprosjekt av en ustilling. [Journal]. Østlandsposten. Fulltekst i vitenarkiv
• Knudsen, Trine-Lise (2003). Presentasjon av ny, permanent geologiutstilling ved Larvik museum. [Radio]. Vestfoldnytt. Fulltekst i vitenarkiv
• Knudsen, Trine-Lise (2003). �Berget det blå - en reise i larvikittens historie�. Fulltekst i vitenarkiv
• Knudsen, Trine-Lise (2003). Geologien i Kolsåsområdet. [Journal]. Asker og Bærum budstikke, helgebilag ved Espen Andersen. Fulltekst i vitenarkiv
• Knudsen, Trine-Lise (2003). Symbolkraft i stein. Om bruk av norsk bygningsstein gjennom tidene. Naturen. ISSN 0028-0887. 127(5), s. 208–214. Fulltekst i vitenarkiv
• Knudsen, Trine-Lise (2003). Genetic conditions and timing of agpaitic magmatism in the Langesund fjord area, the Oslo Rift (SE Norway). Fulltekst i vitenarkiv
• Knudsen, Trine-Lise (2003). Nytt museum om geologi i Larvik! Stein. ISSN 0802-9121. 30(4), s. 9–12. Fulltekst i vitenarkiv
• Knudsen, Trine-Lise (2003). Symbolkraft i stein. Om bruk av norsk bygningsstein gjennom tidene. Fulltekst i vitenarkiv
• Knudsen, Trine-Lise & Johansen, Bjørn Vidar (2003). Byvandring fra Slottet og ned Karl Johanns gate. Stein som bygningsmateriale ved etableringen av en hovedstad. Fulltekst i vitenarkiv
• Knudsen, Trine-Lise (2003). Oslofeltet. Fulltekst i vitenarkiv
• Knudsen, Trine-Lise (2003). Osloriften. Fulltekst i vitenarkiv
• Knudsen, Trine-Lise (2003). Oslofeltet � Norges svar på den Østafrikanske Rift. Fulltekst i vitenarkiv
• Knudsen, Trine-Lise (2003). Osloriften. Fulltekst i vitenarkiv
• Johansen, Bjørn Vidar & Knudsen, Trine-Lise (2003). Byvandring blant bygningsstein fra Kvadraturen til Akershus. Fulltekst i vitenarkiv
• Knudsen, Trine-Lise (2002). Hva skjer når jorda revner? Med Oslo-riften som eksempel. Naturen. ISSN 0028-0887. s. 171–176. Fulltekst i vitenarkiv Vis sammendrag

  Oslo-riften brukes som geologisk betegnelse på et området som er eksponert fra Tønsberg og Skien i sør, til Mjøsa i nord. Berggrunnen her består hovedsakelig av forsteinede sedimenter (kalk og skifer) og magmatiske dyp- og dagbergarter, deriblant larvikitter, lavaer og granitter. Utenfor rift-området finner man over en milliard år gamle, sterkt deformerte gneiser. Østgrensen for riften utgjør en sone der jordoverflaten engang revnet, slik at berggrunnen vest for bla. Ekebergskråningen i Oslo, Nesoddlandet og Moss, bikket to til tre km ned i dypet. Hvorfor revner jordskorpen og hva skjer i dypet av en rift? I over hundre år har forskere fra hele verden vært opptatt av å besvare disse spørsmålene og Oslo-riften er det perfekte sted for slike studier.

• Knudsen, Trine-Lise (2002). Farlige og ufarlige vulkaner. Fulltekst i vitenarkiv
• Knudsen, Trine-Lise (2002). Oslofeltet ¿ Norges svar på den Østafrikanske Rift. Fulltekst i vitenarkiv
• Knudsen, Trine-Lise (2002). Oslofeltet ¿ Norges svar på den Østafrikanske Rift. Fulltekst i vitenarkiv
• Knudsen, Trine-Lise (2002). W.C. Brøgger (1851-1940): Geolog og samfunnsbygger. Naturen. ISSN 0028-0887. s. 10–16. Fulltekst i vitenarkiv Vis sammendrag

  I november 2001 var det 150 år siden Waldemar Christopher Brøgger ble født, en betydelig forsker og den største norske kunnskapspolitikeren ved overgangen til nitten hundre tallet. Dette var en spennende brytningstid i Norge, løsrivelsen fra unionen med Sverige var på trappene, darwinismen var fortsatt kontroversiell i mange kretser og naturvitenskaplig kunnskap ble viktigere enn før. Brøgger hadde visjoner om hvordan en selvstendig, opplyst og sterk nasjon skulle bygges opp, og hadde evner og krefter til å gjennomføre mange av sine ideer. I sine mest optimistiske øyeblikk så han Norge som et kommende nytt Athen i Norden, en intellektuell stormakt i Europa.

• Knudsen, Trine-Lise (2002). Langesundfjordens pegmatittmineraler og W.C. Brøgger. Stein. ISSN 0802-9121. s. 8–12. Fulltekst i vitenarkiv Vis sammendrag

  Waldemar Christopher Brøgger var universitetets første rektor, og blant mye annet sterkt medvirkende til at byggingen av Zoologisk, Botanisk og Geologisk museum på Tøyen i Oslo ble finansiert, og han etablerte seg som professor ved Geologisk museum etter ferdigstillingen i 1917. 10. November 2001 var det 150 år siden Brøggers fødsel. Ved Geologisk museum markeres dette med en minneutstilling over hans livslange virke som mineralog, paleontolog, petrolog og kvartærgeolog. Brøggers detaljerte arbeide på pegmatittene i Langesundfjorden (1890) står imidlertid som et høydepunkt i hans forskning. Det er fortsatt standardreferansen på Langesundfjordens mineraler på grunn av hans undersøkelser av samtlige mineraler og deres dannelsesrekkefølge, knyttet opp mot kjemiske analyser av mineralene og bergartene. Brøgger beskrev i detalj over 70 mineraler fra Langesundfjorden, hvorav det er syv som i dag regnes som egne mineralspecies med typelokalitet i Langesundfjorden. I dag er over 170 forskjellige mineraler kjent fra dette rike området.

• Andersen, Tom; Griffin, Wiiliam L.; Jackson, S.E. & Knudsen, Trine-Lise (2001). Timing of mid-Proterozoic calcalkaline magmatism across the Oslo Rift: Implications for the evolution of the southwestern margin of the Baltic Shield. Fulltekst i vitenarkiv
• Knudsen, Trine-Lise (2001). Zirkon, mer enn bare et pent mineral. Stein. ISSN 0802-9121. s. 8–13. Fulltekst i vitenarkiv
• Knudsen, Trine-Lise (2001). På leting etter tapte landområder. GEO. s. 40–42. Fulltekst i vitenarkiv Vis sammendrag

  Dette er historien om en lang periode med strekninger i jordskorpen og påfølgende episoder med erosjon og avsetning av sedimenter. Dette er også historien om all den informasjonen som fins lagret i sand og sandsteiner om områder som ikke lenger fins. Utgangspunktet vårt er to kontinenter, det Baltiske skjold (som omfatter Norge, Sverige, de Baltiske stater og Russland) og Laurentia (inklusive Øst-Canada, Grønland og Skottland) som kolliderte, dannet den Himalaya-liknende kaledonske fjellkjeden og utgjorde et superkontinent gjennom flere hunder millioner år fra silur til tertiær tid. I sømmen mellom disse to kontinentene er sen-kaledonske sedimentbassenger av devonsk alder bevart. Gjentatte forsøk på oppsplitting av superkontinentet var ledsaget av bevegelser i jordskorpen som medførte hevning og erosjon av landområder. Dette gav avsetning av sand i Nordsjøbassenget i periodene trias, jura, kritt og sen paleocen. Her skal vi se at de devonske bassengene var kildeområde for flere av sandsteinssekvensene.

• Knudsen, Trine-Lise & Roaldset, Elen (2001). Jubileet for W.C. Brøgger. GEO. s. 9–9. Fulltekst i vitenarkiv
• Knudsen, Trine-Lise (2001). Det Gamle Røde Kontinentet - fragmenter av et tapt landområde. Naturen. ISSN 0028-0887. s. 73–77. Fulltekst i vitenarkiv Vis sammendrag

  Dette er historien om en urolig geologisk æra, med erosjon og sedimentasjon som en følge av strekninger i jordskorpen ved gjentatte forsøk på oppsplitting av et superkontinent (som omfattet Nord-Amerika, Skottland, Grønland og Nord-Europa inklusive Norge) fra devon tid. Devon (for 410 til 360 millioner år siden) representerer en viktig geologisk periode i utviklingshistorien. Ved inngangen til devon råder primitive urfisk (uten kjever og indre skjelett), senere opptrer panserhaier og benfisk, mens de første krypdyrene inntar landjorda ved utgangen av devon. Plantene erobrer landjorda i devon, først som primitive kråkefotplanter, senere ved et mangfold av karsporeplanter. Mot slutten av devon utgjør de store skoger som bla. er bevart som mektige kullag på Bjørnøya. Muligheter for variasjon ligger alltid tilstede i det biologisk arvemateriale, men store forandringer i livsbetingelsene i silur og devon, presset frem tilpasninger i dyre- og planteriket. De geologiske forholdene viser hvor godt levende organismer har tilpasset seg endringer i de naturgitte forhold. Informasjonskilden er alderen til zirkoner som fins sand og sandstener og stammer fra kildeområdet til sanden.

• Knudsen, Trine-Lise (2001). Brøggerutstilling på Geologisk museum. Stein. ISSN 0802-9121. s. 42–42. Fulltekst i vitenarkiv
• Andersen, Tom & Knudsen, Trine-Lise (2000). Rifting of a composite continent: Radiogenic isotope characteristics of dominant crustal componnts in the Oslo Rift area, S. Norway. Fulltekst i vitenarkiv
• Knudsen, Trine-Lise (2000). Å måle tid: om geologiske klokker. Naturen. ISSN 0028-0887. 6, s. 316–320. Fulltekst i vitenarkiv
• Knudsen, Trine-Lise (2000). Tromøy - et lite stykke eksotisk berggrunn i Sør-Norge. Naturen. ISSN 0028-0887. 4, s. 209–214. Fulltekst i vitenarkiv
• Knudsen, Trine-Lise (2000). En dynamisk og "levende" berggrunn: eksempel fra Sørlandet. Naturen. ISSN 0028-0887. 3, s. 137–144. Fulltekst i vitenarkiv
• Knudsen, Trine-Lise (2000). Rifting of a composite continent: Radiogenic isotope characteristics of dominant crustal components in the Oslo rift area, S.Norway. Fulltekst i vitenarkiv
• Knudsen, Trine-Lise (1999). Provenance of upper Triassic to lower Jurassic sediemnts from the North Sea (the Lunde and Statfjord Formations of the Gullfaks oilfield); An integrated SIMS U-Pb detrital zircon, trace element and Sm-Nd study. Fulltekst i vitenarkiv
• Knudsen, Trine-Lise (1999). Provenance of upper Triassic to lower Jurassic sediemnts from the North Sea (the Lunde and Statfjord Formations of the Gullfaks oilfield); An integrated SIMS U-Pb detrital zircon, trace element and Sm-Nd study. Fulltekst i vitenarkiv

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