 | | Journal (article/letter/editorial) |
| 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 aāc...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 Ā± 0.5 for LZa, 2.0 Ā± 0.2 for LZbāc, 2...granophyres in LZaāc. The granophyres formed as the intrusion cooled through the minimum melt solidus in LZa |
 | | Journal (article/letter/editorial) |
| Mullite-corundum-spinel-cordierite-plagioclase xenoliths in the Skaergaard Marginal Border Group: multi-stage interaction...pyro-metamorphosed by the Tertiary Skaergaard Intrusion, East Greenland. In an initial stage of heating...event after being entrained as xenoliths into the Skaergaard Marginal Border Group, where they experienced...underwent bulk melting, but did not mix with the Skaergaard magma, presumably because of the high viscosity...corundum+mullite+sillimanite+ plagioclase+spinel+rutileĀ±tridymiteĀ±cordierite and they reacted with the surrounding |
 | | Journal (article/letter/editorial) |
| (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 |
 | | Journal (article/letter/editorial) |
| 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...disequilibrium partial melting in the adjacent Skaergaard ferrogabbros. Olivine, ferrobustamite, and magnetite...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 |
 | Veksler, Ilya V., Dorfman, Alexander M., Danyushevsky, Leonid V., Jakobsen, Jakob K., Dingwell, Donald B. (2006) Immiscible silicate liquid partition coefficients: implications for crystal-melt element partitioning and basalt petrogenesis. Contributions to Mineralogy and Petrology, 152 (6) 685-702 doi:10.1007/s00410-006-0127-y | Journal (article/letter/editorial) |
| important role in large gabbroic intrusions, such as Skaergaard, and during the generation of unusual lavas,...the debates about magma evolution in the Skaergaard intrusion (McBirney and Nakamura 1974; McBirney and...magmatic rocks, such as the Skaergaard intrusion of layered gabbros, East Greenland (Jakobsen et al. 2005)...melt, Lsi silicic melt, Lb boron-rich melt, tr tridymite, ol olivine, FeāTi oxide solid solutions (wuĢstite...silica-rich liquid Lsi, fayalitic olivine (Table 3), tridymite and FeāTi oxides. The borosilicate composition |
 | | Journal (article/letter/editorial) |
| CONCERNING INTENSIVE PARAMETERS IN THE SKAERGAARD INTRUSION S. A. MORSE*, D. H. LINDSLEY**, and R....used to estimate silica activity in the Skaergaard intrusion, which when plotted against 1 /T appears...analysis of intensive parameters in the Skaergaard intrusion, Williams (197lb) deduced a T-Ā£02 path running...estimation of oxygen fugacity in the Lower Zone of the intrusion. This discussion is directed primarily to systematics...Layered Intrusions Silica activities refer to tridymite as the form of silica. Oxygen fugacities are referred |
 | Wotzlaw, Jƶrn-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 JoĢrn-Frederik Wotzlaw a,n...studied intrusive bodies on Earthāthe 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 |
 | | Journal (article/letter/editorial) |
| 1371ā1376, 2009 Liquidus temperatures of the Skaergaard magma Peter thy,1,* Christian tegner,2 and Charles...abstraCt The liquidus temperatures of the Skaergaard intrusion can be estimated for the layered series...predicts a total crystallization interval for the intrusion of ~150 Ā°C. Plagioclase crystallized in the Hidden...chilled margin rocks and gabbros from the Skaergaard intrusion and liquid line of descent modeling. Our...high-pressure experimental data for the Kiglapait intrusion to Skaergaard emplacement conditions. Proposed variations |
 | Veksler, I. V., Dorfman, A. M., Borisov, A. A., Wirth, R., Dingwell, D. B. (2008) Liquid Immiscibility and Evolution of Basaltic Magma: Reply to S. A. Morse, A. R. McBirney and A. R. Philpotts. Journal of Petrology, 49 (12) 2177-2186 doi:10.1093/petrology/egn064 | Journal (article/letter/editorial) |
| unexpected melt inclusions in apatite from the Skaergaard intrusion (Jakobsen et al., 2005). These inclusions...that, surprisingly, some important features of Skaergaard rocks had been overlooked or dismissed by numerous...close collaboration with experts on the Skaergaard intrusion in Denmark and the UK (see the Acknowledgements)...that the idea of early immiscibility in the Skaergaard intrusion is at odds with broadly accepted views,...explain some conflicting facts about the Skaergaard intrusion that were briefly outlined in our original |
 | | Journal (article/letter/editorial) |
| 2008 Letter Toward a thermal model for the Skaergaard liquidus S.A. Morse* Department of Geosciences...1-atm study by McBirney and Naslund (1990), the Skaergaard liquidus temperature is linear from LZa to UZa...content as the corresponding point in the Kiglapait intrusion, studied at 5 kbar by Morse et al. (2004). This...temperature, 1203 Ā°C at 5 kbar, is transformed to the Skaergaard pressure at LZa/b to a value of 1173 Ā°C. From...fixed point, all other liquidus temperatures at Skaergaard are scaled to mean plagioclase core compositions |
 | | Journal (article/letter/editorial) |
| inclusions in native iron on Disco island, West Greenland, and in the Siberian trap province (Ryabov et...crystallisation of tridymite from homogenous melt at only 53.3 wt% SiO2. We interpret tridymite as metastable...segregation was incomplete, and small amounts of tridymite were still present. Nevertheless, centrifuge pool...composition from the Middle Zone of the Skaergaard intrusion previously constrained by static experiments...Our results imply that liquid immiscibility in Skaergaard is likely already at the transition from the |
 | | Journal (article/letter/editorial) |
| inclusions in native iron on Disco island, West Greenland, and in the Siberian trap province (Ryabov et...crystallisation of tridymite from homogenous melt at only 53.3 wt% SiO2. We interpret tridymite as metastable...segregation was incomplete, and small amounts of tridymite were still present. Nevertheless, centrifuge pool...composition from the Middle Zone of the Skaergaard intrusion previously constrained by static experiments...Our results imply that liquid immiscibility in Skaergaard is likely already at the transition from the |
 | | Journal (article/letter/editorial) |
| Isle of Skye, containing quartz paramorphs after tridymite. (With Plate XIII.) By L. R. WAGER, M.A., Sc.D...phenoerysts of tridymite, now inverted to quartz. In the Thulean Tertiary igneous province former tridymite is known...intrusive acid rocks. In addition to phenocrysts of tridymite inverted to quartz, there is present in the groundmass...unehilled granophyre a second generation of inverted tridymite crystals, surrounded by a final stage of quartz...basalts, the parallel, steep-sided margins of the intrusion dipping at 80 ~ to the ESE. (fig. 1, inset). The |
 | | Journal (article/letter/editorial) |
| the Marginal Border Group of the Skaergaard Intrusion, East Greenland M. A. KAYS and A. R. MCBIRNEY Department...picrite blocks in the margins of the Skaergaard intrusion, East Greenland are gabbro-contaminated xenoliths...undisturbed picrite or ultramafic rocks in the Skaergaard intrusion, and an extensive Hidden Zone is not supported...structurally below the northern margin of the intrusion. It is possible that the refractory precursors...precursors of picrite in the Skaergaard intrusion may have been ultramafic xenoliths and are not representative |
 | | Journal (article/letter/editorial) |
| (p- p") will arise from mixing. Il qlartz or tridymite had been chosen as the I We are concerned with...reaction is shown as the top curve in Figure 1. Tridymite is the stable silica mineral over the crystallization...but as the curve of the reaction silicaglass-tridymite virtually coincides with the silica-glass-quartz...the large tholeiitic layered intrusions (e.g., Skaergaard and Bushveld) is influenced by the silica activity...olivine (Wager and Brown, 1968). In the Skaergaard intrusion the pyroxenes are less iron-rich when pigeonite |
 | | Journal (article/letter/editorial) |
| simple crystallization differentiation of the Skaergaard-like magma is obtained and plotted in a FeCH-Fe203-MgO-Na20+K20... The condition of solidification of the Skaergaard intrusion was also examined [2] in terms of the forsterite-fayalite...independently. In the actual example of the Skaergaard intrusion, the sets of physical conditions obtained...rock can be observed as an outcrop. The Skaergaard intrusion is one of the rare examples in which the...belong to this group. The example of the Skaergaard intrusion may be used for 1). However, it is doubtful |
 | | Journal (article/letter/editorial) |
| contacts. One pair of liquids crystallized some tridymite, whereas the other compositions were clearly above...at the top of the Lower Zone of the Skaergaard layered intrusion. b Natural immiscible liquids in melt...from the Middle Zone of the Panzhihua layered intrusion, China (Wang et al. 2013). a drop of water and...some tridymite (Fig. 2), whereas the other compositions were clearly above the liquidus. Tridymite crystallization...magmatic microstructures in the Skaergaard Intrusion, East Greenland. Journal of Petrology, 52, 175ā222 |
 | | Journal (article/letter/editorial) |
| 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 |
 | | Journal (article/letter/editorial) |
| Late Stages of Fractionation of the Skaergaard Intrusion, East Greenland by G. M. BROWN and E. A. V I N C...PLATES INTRODUCTION I N the memoir on the Skaergaard intrusion, Wager & Deer (1939) showed that five augites...intrusions followed a similar trend, but that only the Skaergaard contained evidence for the trend characteristics...ferroaugites, and ferrohedenbergites from the Skaergaard layered series and, combining these with the...analysed by Deer, postulated a trend unique to this intrusion (op. cit.,fig.1). Six of these plotted points |
 | | Journal (article/letter/editorial) |
| Granophyres in the Marginal Border Group, Skaergaard Intrusion, East Greenland M.A. Kays, A.R. McBirney, and G...character of the Marginal Border Group of the Skaergaard intrusion. Precambrian gneisses were a major source...as xenoliths in the outermost part of the Skaergaard intrusion, the Marginal Border Group (MBG). The gneisses...geophysical data (Gettings 1976) probably floor the intrusion. Xenoliths of these rocks are of special interest...Precambrian rocks in the general area of the Skaergaard intrusion are dominantly banded migmatitic gneisses |
 | | Journal (article/letter/editorial) |
| mineralogy (plagioclase 49.1 volume %, pyroxene 48.9%, tridymite 0.72%. chromite 1.0%, troilite 0.24% and metallic...adcumulate formed in a terrestrial layered igneous intrusion. Its composition and texture most closely resemble...plagioclase (white) with minor chromite (black) and tridymite, troilite and metallic iron. Vesicular fusion...(grain size ~ 0.5 to I mm) and minor amounts of tridymite, chromite, troilite and metallic iron phase, Table...the Moama eucrite! Vol. % plagioclase pyroxene tridymite chromite troilite metal 49.1 48.9 0.72 1.0 0 |
 | | Journal (article/letter/editorial) |
| Senarmontite-Valentinite Rutile-Anatase-Brookite Quartz-Tridymite-Cristobalite Calcite-Aragonite Kyanite-Andalusite-Sillimanite...explanation was offered for the persistenceof tridymite and cristobaliteat low temperatures(Ruerger,1935...strengthened by the discovery of. a variety of tridymite, named christensenite, that contains abo'tt 5/6...that of the igneous rocks of the Skaergaard intrusive of eastern Greenland (Wager and Mitchell, 1943, 1951)...cautious in drawing generalizations, since the Skaergaard magma was somewhat unusual in composition, particularly |
 | | Journal (article/letter/editorial) |
| the Upper Layered Series Kap Edvard Holm, East Greenland R. ELSDON Department of Geology, The University...is a gradual enrichment in iron upwards in the intrusion although there is no measurable effect on the...the west side of Kangerdlugssuaq Fjord, East Greenland. From an analysis of the structure of the gabbros...refractive indices than those from, for example, the Skaergaard and Stillwater intrusions. There are small differences...augites of similar compositions from the Skaergaard intrusion lie well within the non-alkaline field (figs |
 | Thy, Peter, Lesher, Charles E., Nielsen, Troels F.D., Brooks, C. Kent (2008) On the Skaergaard intrusion and forward modeling of its liquid line of descent: A reply to āPrinciples of applied experimental igneous petrologyā by Morse, 2008, Lithos 105, pp. 395ā399. Lithos, 105 (3) 401-411 doi:10.1016/j.lithos.2008.04.007 | Journal (article/letter/editorial) |
| a t e / l i t h o s Discussion On the Skaergaard intrusion and forward modeling of its liquid line...CA 95616, USA Geological Survey of Denmark and Greenland, Ćster Voldgade 10, DK-1350 KĆøbenhavn K, Denmark...duplicated main features of the gabbros in the Skaergaard layered series [Thy, P., Lesher, C.E., Nielsen...Brooks, C.K. 2006. Experimental constraints on the Skaergaard liquid line of descent. Lithos 92, 154ā180.]...emplacement and crystallization conditions of the Skaergaard intrusion. The dike rocks used as starting materials |
 | | Journal (article/letter/editorial) |
| 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...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...Introduction Since the discovery of the Skaergaard Intrusion in 1930, numerous studies of the Layered |
