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| sequence of the Upper Border Series of the Skaergaard Intrusion: revised subdivision and implications for...crystallization sequence of the Skaergaard Intrusion, east Greenland, remains in debate. In particular...(simultaneously), sulfides, apatite and finally ferrobustamite (now inverted to hedenbergite). This crystallization...plagioclase cores in the three series imply that the Skaergaard magma chamber solidified by in situ crystallization...homogenous, convecting magma body. Keywords Skaergaard Layered intrusion Crystallization sequence Magma |
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| contact aureole of the Basistoppen sill, East Greenland H.R. Naslund Department of Earth Sciences, Dartmouth...into the upper part of the Skaergaard complex shortly after the Skaergaard m a g m a had solidified. Heat...partial melting in the adjacent Skaergaard ferrogabbros. Olivine, ferrobustamite, and magnetite were selectively...are distinct from those found elsewhere in the intrusion. The extreme degree o f contact metamorphism adjacent...the Basistoppen sill is a consequence of the intrusion of the sill into host rocks that were already |
 | Wotzlaw, Jörn-Frederik, Bindeman, Ilya N., Schaltegger, Urs, Brooks, C. Kent, Naslund, H. Richard (2012) High-resolution insights into episodes of crystallization, hydrothermal alteration and remelting in the Skaergaard intrusive complex. Earth and Planetary Science Letters, 355. 199-212 doi:10.1016/j.epsl.2012.08.043 | Journal (article/letter/editorial) |
| hydrothermal alteration and remelting in the Skaergaard intrusive complex Jörn-Frederik Wotzlaw a,n...studied intrusive bodies on Earth—the Skaergaard intrusion in East Greenland. With analytical uncertainties...several important events during cooling of this intrusion. Initial cooling of the shallowly intruded 300...gabbroic pegmatite in the lower portion of the intrusion. Based on this zircon crystallization age and...emplacement to be 56.02 Ma. The last portions of Skaergaard appear to crystallize completely 100 ka after |
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| 1007/s00410-007-0245-1 ORIGINAL PAPER Plagioclase in the Skaergaard intrusion. Part 1: Core and rim compositions in the...12 rocks from the layered series of the Skaergaard intrusion has been studied by electron microprobe...Pupier e-mail: elsa.pupier@free.fr Keywords Skaergaard intrusion Magmatic processes Compositional convection...Plagioclase zoning Introduction The Skaergaard intrusion, East Greenland, is widely considered a case study...plutonism. Indeed, over the years, study of the Skaergaard has had a profound influence on our understanding |
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| from the Late Ferrodiorites of the Skaergaard Intrusion, East Greenland Yin Yin Nwe and P.A. Copley Department...from the Upper Zone (UZb and UZc) of the Skaergaard intrusion (Brown and Vincent, 1963) have been studied...from the Upper Zone (UZb and UZc) of the Skaergaard intrusion (Wager and Deer, 1939). They are, in ascending...the later stages of crystallisation of the Skaergaard intrusion, a pressure of 600_+ 100 bars, a temperature...Vincent, 1963) is such that it lies off the main Skaergaard ferroaugite-ferrohedenbergitetrend established |
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| Petrology of the Basistoppen Sill, East Greenland: A Calculated Magma Differentiation Trend by H. R....tholeiitic intrusion of Eocene age contained largely within the upper part of the Skaergaard igneous complex...a large xenolith of pre-Skaergaard country-rock which sank into the Skaergaard magma chamber (Wager &...to be a post-Skaergaard intrusion emplaced shortly after solidification of the Skaergaard magma (Douglas...differentiation sequences of any known tholeiitic intrusion. The degree of iron-enrichment developed in the |
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| PAPER Iron in plagioclase in the Bushveld and Skaergaard intrusions: implications for iron contents in...iron-rich rocks of the tholeiitic Bushveld and Skaergaard intrusions are similar in containing cumulus...liquid evolution of Skaergaard is presented. For plagioclase in the Upper Zone of Skaergaard it was previously...under slightly more oxidizing conditions than Skaergaard, differences in the partition coefficients cannot...of the subsequent cumulates. In contrast, the Skaergaard liquid contained more total FeO than the ensuing |
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| October 2008 Keywords: Experimental petrology Skaergaard Tholeiitic magma Liquid immiscibility Plutonic...for a classical example of the Skaergaard intrusion in East Greenland, where the trend of extreme Fe...seemingly conflicting results of experiments on Skaergaard natural cumulate rocks and model melt compositions...assumed that silicate liquid immiscibility in Skaergaard started not at the very end of crystallization...liquid line of descent for a well studied mafic intrusion. Unfortunately, things turn out to be much more |
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| The Skaergaard Intrusion of East Greenland: Paradigms, Problems and New Perspectives Marian B. Holness1...2138/gselements.13.6.391 T he Skaergaard Intrusion of East Greenland is the quintessential example of...expelled from solidifying crystal mushy zones. Skaergaard remains a cradle for new insights into igneous...immiscible liquids on magma evolution. Keywords : Skaergaard, cumulates, fractionation, gabbro INTRODUCTION...wide range of compositions observed in a single intrusion can be created internally by the progressive change |
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| and Mining in Greenland GEOLOGY AND ORE The mineral potential of the East Greenland Palaeogene intrusions...complex Wiedemann Fjord Lilloise intrusion Kangerlussuaq intrusion Flammefjeld Bl os se Sødalen...Sødalen Miki Fjord Skaergaard intrusion Kangerlussuaq Kap Edvard Holm Palaeogene basalt Nordre Aputiteq Cretaceous/Palaeogene...Major fault Iceland Map of the Palaeogene East Greenland igneous province. 2 16° I Major sill complexes...strike for hundreds of kilometres and represent intrusion from c. 60 to at least 35 Ma. The dyke swarms |
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| com/locate/lithos Postmagmatic sulphur loss in the Skaergaard Intrusion: Implications for the formation of the Platinova...stratabound Platinova Au–Pd Reef in the Skaergaard Intrusion is intimately linked to Cu–Fe sulphide minerals...silicate–sulphide liquid immiscibility in the Skaergaard magma. However, although the evidence is strong...shape, volume, and compositional relations of the Skaergaard lithologies allows for numerical modeling of...across the intrusion. © 2006 Elsevier B.V. All rights reserved. Keywords: Skaergaard Intrusion; Platinova |
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| Heat capacities of synthetic hedenbergite, ferrobustamite, and CaFeSi206 glass H. T. HASELTON, JR., R...measured for synthetic hedenbergite (9-647 K), ferrobustamite (5 746 K), and CaFeSisc)s.glass (6-380 K) by...antiferromagnetic ordering of the I@’ ions. Ferrobustamite has a bump in its heat-capacity curve at temperatures...for hedenbergite, ferrobustamite and CaFeSi,O, glass, respectively. Ferrobustamite is partially disordered...1.84604 x 106Tw2 and the heat capacity of ferrobustamite may be represented by Cs (J/m01 - K) = 403 |
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| COMMUNICATIONS A GOLD-BEARING HORIZON IN THE SKAERGAARD INTRUSION, EAST GREENLAND DENNIS K. BIRD, Department of Geology...Ford, 1981; Hoover,1989; McBirney,1989). The intrusion is characterized by three mappableunitstermedthe...Grouphorizon of the Middle zonein the Skaergaard intrusion,East Greenland. Theuppermost of theselayersisgoldrich...composition Oceanbasin(Brooksand Nielsen, 1982). Skaergaard fashionwith increasingstratigraphicheight in...plagioclasecompositions are nearlyconstantat An41 The Skaergaard intrusionwasformedby the em- to An49over '-•700 |
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| the solidification of the Skaergaard intrusion: Eruption of East Greenland flood basalts in less than...the cumulus stratigraphy of the Skaergaard intrusion, East Greenland. Samples from the Lower Zones a–c...granophyres record the pressure under which the Skaergaard intrusion crystallised. Pegmatitic granophyre from...Pressures, recalculated to the roof pendant of the intrusion, are 0.7 ± 0.5 for LZa, 2.0 ± 0.2 for LZb–c, 2...granophyres in LZa–c. The granophyres formed as the intrusion cooled through the minimum melt solidus in LZa |
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| space group can be explained best assuming ferrobustamite (with wollastonite structure) as a precursor...Above 970³C a two phase field exists between ferrobustamite and augite. The miscibility gap widens towards...found. Their compositions fit well into the ferrobustamite^augite two phase field above 1050³C. Very fast...controls the incomplete transformation from ferrobustamite to hedenbergite resulting in the observed P2/n...of PMHed is identical to the composition of ferrobustamite, a `3er Ketten' pyroxenoid with hedenbergitic |
 | Andersen, Jens C. Ø., Rollinson, Gavyn K., McDonald, Iain, Tegner, Christian, Lesher, Charles E. (2017) Platinum-group mineralization at the margin of the Skaergaard intrusion, East Greenland. Mineralium Deposita, 52 (6) 929-942 doi:10.1007/s00126-016-0707-3 | Journal (article/letter/editorial) |
| mineralization at the margin of the Skaergaard intrusion, East Greenland Jens C. Ø. Andersen 1 & Gavyn K...(PGEs) along the northern margin of the Skaergaard intrusion include a sulfide-bearing gabbro with slightly...that the occurrences are related to the Skaergaard intrusion. The Marginal Border Series locally displays...explained by sulfide-silicate immiscibility in the Skaergaard magma with R factors of 110– 220. Nickel depletion...chalcopyrite-bornite-digenite assemblage found in the Skaergaard Layered Series and Platinova Reef. These differences |
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| (1997) 645-658 40Ar/ 39Ardating of the Skaergaard intrusion Marc M. Hirschmann a3*, Paul R. Renne b*l...report the first 4oAr-39Ar data for the Skaergaard Intrusion, based on analyses of hornblende and biotite...from a gabbro from Lower Zone A (LZa) of the Skaergaard Layered Series indicates that the sample has...inherited from old crust and does not constrain the intrusion age, apart from indicating that it is less than...emplacement and final crystallization of the Skaergaard magma chamber to be at 55.75 + 0.30 Ma and 55 |
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| Naslund Major and trace element composition of Skaergaard plagioclase; geochemical evidence for changes...the ®nal stage of crystallization of the Skaergaard intrusion Received: 1 October 1999 / Accepted: 14...and Marginal Border Series (MBS) of the Skaergaard intrusion were analyzed to examine major and trace...major components of Skaergaard plagioclase during the dierentiation of the intrusion are observed. Trace...elements in plagioclase re¯ect changes in the Skaergaard magma and changes in plagioclase distribution |
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| org/10.1007/s00410-018-1466-1 ORIGINAL PAPER The Skaergaard trough layering: sedimentation in a convecting...parts of the floor cumulates of the Skaergaard Intrusion, East Greenland, contain abundant features known...from the nearby chamber walls. Keywords The Skaergaard intrusion · Trough layering · Texture analysis · EBSD...example of trough layering in the Skaergaard intrusion of East Greenland; a particularly contentious example...igneous system. Geological background The Skaergaard intrusion (Fig. 1) formed from the injection of a |
 | Jakobsen, Jakob K., Tegner, Christian, Brooks, C. Kent, Kent, Adam J. R., Lesher, Charles E., Nielsen, Troels F. D., Wiedenbeck, Michael (2010) Parental magma of the Skaergaard intrusion: constraints from melt inclusions in primitive troctolite blocks and FG-1 dykes. Contributions to Mineralogy and Petrology, 159 (1) 61-79 doi:10.1007/s00410-009-0416-3 | Journal (article/letter/editorial) |
| ORIGINAL PAPER Parental magma of the Skaergaard intrusion: constraints from melt inclusions in primitive...tholeiitic dyke cutting across the Skaergaard intrusion, East Greenland. Plagioclase in these blocks contains...succession (Milne Land Formation) of the regional East Greenland flood basalt province. New major- and trace element...FG-1 dyke swarm, previously taken to represent Skaergaard magmas, overlap with the entire range of the...succession and do not form a coherent suite of Skaergaard like melts. These dykes are therefore re-interpreted |
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| from the Upper Zone of the Kiglapait layered intrusion, Labrador, span the range from En73 to En0, disposed...external orthopyroxene to pigeonite in the Skaergaard intrusion. Exsolution of ilmenite in or near (100)... INTRODUCTION The large, 1.307 Ga Kiglapait intrusion on the coast of Labrador is a well-preserved example...2001). By contrast, apatite appears suddenly, intrusion-wide, at 94 PCS, furnishing a signal of a well-stirred...contrast with more silica-rich bodies such as the Skaergaard and Bushveld intrusions (e.g., Wager and Brown |
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| inova GoldandPalladium Reefsin theSkaergaard Intrusion: Stratigraphic andPetrographic Relations JENS...relations ofthePlatinova reefsin theSkaergaard intrusion. Thereefscomprise a strata-bound occurrence of...in a systematic wayacross the intrusion. Nearthe centerof the intrusion, the Au concentration occurs some60...which oxidized the iron-titanium oxides of the intrusion. This oxidation-desulfurization probably hadnooverall...mainpalladiumoccurrence Ltd.revealed thattheSkaergaard intrusion hosts apotentiallysourceestimatebut reachessi |
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| melt, LF), quartz, orthopyroxene, olivine, and ferrobustamite (a pyroxenoid). Minor phases are Mo–Fe oxides...Px orthopyroxene, Ol olivine, Qtz quartz, Fb ferrobustamite, Fa fayalite, Pho phosphate 123 260 Contrib...SiO2-poor melt, Px orthopyroxene, Ol olivine, Fb ferrobustamite, n number of analyses SiO2-poor melts. These...plane Fe2SiO4– CaSiO3–KS) are fayalite and ferrobustamite. By adding a small amount of CaO, Hoover and...metastable but reappears along the fayalite–ferrobustamite cotectic curve in the middle of the Fe2SiO4–Hd’– |
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| invariant point (D in Fig. 2) where a new phase, ferrobustamite, becomes stable (Fig. 3c). Assemblage liq...liq + an + aug + oI + bus (bus = ferrobustamite) This assemblage is restricted to a very narrow temperature...compositional variation of the coexisting augite and ferrobustamite is shown in Fig. 4. Assemblage liq + an +...t u r a l e n v i r o n m e n t of a basaltic intrusion. In n a t u r a l processes, some of the coexisting...the Upper Zone liquid track of the Kiglapait intrusion, similar variations in the aug and ol (the inversely |
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| The Skaergaard Layered Series: I. Structure and Average Compositions by ALEXANDER R. McBIRNEY Center...Oregon, 97403 ABSTRACT Re-examination of the Skaergaard Layered Series in the light of more extensive...that redistributed certain components after the intrusion reached advanced stages of solidification. INTRODUCTION...re-examine each of the major divisions of the Skaergaard Intrusion. H. R. Naslund (1984) has already reported...trace-elements, and isotopic geochemistry of the intrusion as a whole will be provided elsewhere. PRINCIPAL |
