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| Modally-Graded Rhythmic Layering in the Skaergaard Intrusion by MARK E. CONRAD* AND H. R. NASLUNDf Department...ABSTRACT The origin of igneous layering in the Skaergaard and other intrusions is the subject of much debate...found in the Skaergaard. These layers occur only in the Layered Series of the intrusion, in which they...regular manner within the layers studied. The forsterite composition of olivine is consistently higher...of all of the types of layering found in the intrusion. INTRODUCTION Layering is a common feature of |
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| marized in Table 1. specimens 1-11 belong to the forsterite-fayalite series, the specimens 11-15 conform...1' and 17' 15, 16' specimens by only tephroite-forsterite series is represented (specimen 19), Data are...Figure 2, in which the spectraof the olivines forsterite,fayalite, tephroite,and monticelliteare comparedwith...with olivine composition. The spectra of the forsterite-fayalite series (except specimen8, which contains...spectrum of forsterite (specimen1). Most of the peaks could be traced across the forsterite-fayalite series |
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| OLIVINES FROM THE SKAERGAARD INTRUSION, KANGERDLUGSSUAK, EAST GREENLAND W. A. DBBn, Uniaersityof Manchester...separated from the rocks of the Skaergaard intrusion,l Kangerdlugssuak, East Greenland, have been analysed. The...The olivines occur in a layered. gabbro intrusion which shows continuous crystallisation-differentiation...important constituent of the earlier rocks of the intrusion and varies from Fsal in the lowest exposedrocks...crystals. olivine is not found throughout the intrusion being absent for 500 metres at about the middle |
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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...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 |
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| 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-£02 path running...based on reaction constants for the enstatite-forsterite-silica (EFS) equilibrium as revised by Morse...estimation of oxygen fugacity in the Lower Zone of the intrusion. This discussion is directed primarily to systematics |
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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 |
 | ARNASON, JOHN G., BIRD, DENNIS K., BERNSTEIN, STEFAN, ROSE, NICHOLAS M., MANNING, CRAIG E. (1997) Petrology and geochemistry of the Kruuse Fjord Gabbro Complex,
East Greenland. Geological Magazine, 134 (1) 67-89 doi:10.1017/s0016756897006389 | Journal (article/letter/editorial) |
| geochemistry of the Kruuse Fjord Gabbro Complex, East Greenland JOHN G. ARNASON*†, DENNIS K. BIRD*, STEFAN BERNSTEIN‡...The Kruuse Fjord Gabbro Complex is a composite intrusion of layered gabbro and troctolite with subordinate...continental crust of East Greenland during early Tertiary rifting of Greenland from Eurasia. The work to...that occur at intervals along the coast of East Greenland between 66°30« and 69° N (Fig. 1). Until recently...Geological map of the Kangerdlugssuaq region of East Greenland. The dashed ellipses enclose areas with basaltic |
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| range in Mg number (Mg# 1-59) from the Skaergaard Layered Intrusion. Olivine La and Lu concentrations vary... For example, Evans et al. (2008) found that forsterite REE partition coefficients decrease as melt SiO2...for olivine from seven samples of the Skaergaard Layered Intrusion to examine elemental partitioning in...AC CE PT ED MA NU The Skaergaard Layered Intrusion in East Greenland was chosen for this study because...wide range of olivine compositions, ranging from forsterite content (Fo) close to 70 in the Lower Zone to |
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| a monitor of the differentiation of the Skaergaard intrusion Received:13 May 1996 / Accepted:5 January...However, this does not appear to hold for the Skaergaard intrusion. New data from a 950 m long drill core...1994; Toplis and Carroll 1995, 1996). The Skaergaard intrusion is central to this discussion because it...during late-stage dierentiation of the Skaergaard intrusion (Table 1, Fig. 2). The validity of these...most evolved Skaergaard liquids. Drill core 90-22 The petrology of the Skaergaard intrusion (Fig. 1) presents |
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| 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 |
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| Macrodykes of the Kangerlussuaq region, East Greenland David A. Holwell & Thomas Abraham-James & Reid...2011 Abstract The Kangerlussuaq region of East Greenland hosts a variety of early Tertiary extrusive and...also present in the Platinova reefs in the Skaergaard Intrusion, indicate that early fractionation of olivine...globules . Skaergaard . Magmatic . Greenland Introduction The Kangerlussuaq region of East Greenland first...spectacularly layered gabbroic Skaergaard Intrusion was discovered. The Skaergaard Intrusion subsequently received |
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| THE I3RITISH EAST GREENLAND EXPEDITION 1935-36 LEADER: L. R. wAGER THE EAST GREENLAND GEOLOGICAL EXPEDITION...w. A. DEER GEOLOGICAL INVESTIGATIONS IN EAST GREENLAND PART X THE GABBRO CUMULATES OF THE KAP EDVARD...THE BRITISH EAST GREENLAND EXPEDITION 1935-36 LEADER: L.R.WAGER THE EAST GREENLAND GEOLOGICAL EXPEDITION...w. A. DEER GEOLOGICAL INVESTIGATIONS IN EAST GREENLAND PART X THE GABBRO CUMULATES OF THE KAP EDVARD...Kangerdlugssuaq, is one of the major units of the east Greenland Thulean igneous province. The ]argest part of |
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| layered gabbros of the Noe-Nygaard Intrusion, Southeast Greenland STEFAN BERNSTEIN*† & DENNIS K. BIRD‡...†Arctic Station, Box 504, DK-3953, Qeqertarsuaq, Greenland ‡Department of Geological and Environmental Sciences...11 October 1999) Abstract – The Noe-Nygaard Intrusion is a 4 × 2.5 km stock composed of layered gabbros...xenoliths signify a Tertiary age for the intrusion. The intrusion is characterized by alternating zones...characteristics, melts from which the Noe-Nygaard Intrusion crystallized are within the compositional range |
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| further determinations on olivine of the Skaergaard intrusion was being made, and it was necessaryto determinewhether...(1939) Olivines from the Skaergaard intrusion, Kangerdlugssuaq, East Greenland. Am. Mineral.24, 18-25....The r-ray powder determination showed only the forsterite pattern (Yoder and Sahama,1957).Chemicalanalysesalso...(Margrave, 1959) of the thermodynamic stability of forsterite in contact with graphite at MINERALOGICALNOTES...which might explain the intact boules. Since the forsterite-graphitereaction would yield quantities of gas |
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| Precambrian Sequence Bordering the Skaergaard Intrusion by M. A. KAYS, G. G. GOLES, AND T. W. GROVER...tonalitic-granodioritic orthogneisses bordering the Skaergaard Intrusion contain widespread boudins and lenses of...a broader study of basement rocks into which Skaergaard magma was emplaced (Fig. 1). Precambrian rocks...and Kangerdlugssuaq Fjord in this part of east Greenland. Wager identified the gray orthogneisses and a...ji V rj, ' J'i! ""l-f-Z •> rv- ^ INTRUSION -^, SKAERGAARD 02 Flo. 1. Geologic map of a part of |
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| precisely. In the reaction + Sio, : 2MgSioa {srSio+ Forsterite liquid Cliuomtatite (1) and in the absenceof...betu'een the sphene-perovskite curve and the forsterite-clinoenstatite curve as an upper limit. This...(Johannsen,1939) is to desilicatenormative diopside to forsterite and larnite (Fig. 1, u) before desilicating leucite...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 |
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| simple crystallization differentiation of the Skaergaard-like magma is obtained and plotted in a FeCH-Fe203-MgO-Na20+K20...solidification of the Skaergaard intrusion was also examined [2] in terms of the forsterite-fayalite ratio of...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 |
 | 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 |
 | Hepworth, Luke N., Kaufmann, Felix E. D., Hecht, Lutz, Gertisser, Ralf, O’Driscoll, Brian (2020) Braided peridotite sills and metasomatism in the Rum Layered Suite, Scotland. Contributions to Mineralogy and Petrology, 175 (2) doi:10.1007/s00410-019-1652-9 | Journal (article/letter/editorial) |
| Rum Eastern Layered Intrusion (ELI; Scotland) is an open-system layered intrusion constructed of 16 macro-rhythmic...similar mechanisms. Keywords Harrisite · Layered intrusion · Sill emplacement · Infiltration metasomatism...macro-rhythmic units that make up the Rum Eastern Layered Intrusion (ELI) in NW Scotland. The comparatively small...large- and small-scale features of a layered intrusion without some of the textural and chemical equilibration...implications for the formation of the layered intrusion. We present new field, petrographic, and mineral |
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| of the anorthite-Ca-Tschermakite (AnCaTs) and forsterite-enstatite reaction formulations gives a correct...second regional deformation phase, at the time of intrusion o f the gabbro (Senior and Otten, 1985). The second...Markgraaff, 1976), two trends for augite shown; dots - Skaergaard (Brown, 1957; Brown and Vincent, 1963), except...1982); horizontally hatched area - Gosse Pile intrusion (Moore, 1971); vertically hatched area - Lesser...(Fig. 4). Only the pyroxenes in the Gosse Pile intrusion, Australia (Moore, 1971) are comparable to the |
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| gabbros from the Kap Edvard Holm Complex, East Greenland, show no significant variation of temperature...temperature with structural height in the intrusion, while those of Skaergaard give temperatures which do not have...thermodynamic data for diopside, hedenbergite, forsterite and fayalite (b) values for wFeMg and (WFeAr--WMgA1)...~ cals/mole~ a b• cMs/mole ~ c• cals/mole Forsterite --520370 22.75 35.81 6.54 -- 8.52 Fayalite... Applications 1. Intrusions a) Skaergaard Intrusion, East Greenland Temperatures for the layered gabbros |
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| Black Jack teschenite sill, a differentiated intrusion possessing a diameter of one mile and a thickness...thickness of approximately 500 feet. The intrusion is situated about four miles south-west of the township...collected on five radial sections up the face of the intrusion (specimen numbers A to E) and on traverses across...olivine decreases with decreasing height in the intrusion. This study was carried out in the Department...indicated on a contoured geological map of the intrusion. VOL. xcm—NO. 6 37 442 /. F. G. Wilkinson— |
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| demonstrated particularly in the case of the Skaergaard layered intrusion (Wager and Deer, 1939; Wager and Brown...magmas” of igneous petrogenesis. In the case of the Skaergaard, Bushveld, Palisades sill, and other differentiated...reference to the Rhum intrusion (Brown, 1956). It was proposed that a layered intrusion could lie beneath...basalts (Roedder and Weiblen, 1971) and of the Skaergaard intrusion (McBirney, 1975); and from silicate-liquid...McBirney, A. R., Differentiation of the Skaergaard intrusion, Nature, 253, 691 — 694,1975. Nesbitt, R |
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| 10.1007/s00410-008-0361-6 ORIGINAL PAPER The Skaergaard liquid line of descent revisited Peter Thy Æ...between the suggestion that the iron content of Skaergaard liquids increases during Fe–Ti oxide fractionation...buffer (FMQ). A new petrographic study of average Skaergaard gabbros shows that the total modal content of...constraints, as well as experimental results on Skaergaard-related dikes, predicts that fractionation of...modal content of Fe–Ti oxides. Thus, evolved Skaergaard liquids are high in iron and contain a modest |
 | 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 “Principles of applied experimental igneous petrology” by Morse, 2008, Lithos 105, pp. 395−399. 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, Øster Voldgade 10, DK-1350 København 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, 154–180.]...emplacement and crystallization conditions of the Skaergaard intrusion. The dike rocks used as starting materials |
