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| 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...as evidence for inversion from an iron-rich wollastonite. Hess (1941), in considering pyroxenes from...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 |
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| ofprograde wollastonite and clinopyroxene that fills vesiclesand vugs in lavas 30-70 m from the intrusion. P...Parageneticallyequivalent phasesinclude fluorite, wollastonite, calcic clinopyroxene,prehnite, quarlz, and...grandite-bearing assemblages.The presenceof fluorite, wollastonite, quartz, and calcite with these garnets combined...MANNING AND BIRD: FLUORIAN GARNETS FROM THE SKAERGAARD INTRUSION cur in a restricted area ofthe pyroxene...assemblagein amygdule centers consists of prismatic wollastonite and magnesianhedenbergite. Fluorine-bearing |
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| crystallizing in the later stages of the Skaergaard intrusion. INTRODUCTION A LTHOUGH pyroxene-bearing...hedenbergite granophyre, E.G. 3047 from the Skaergaard intrusion, but the analyses of the rocks show that... (Mull Memoir, p. 20.) 4. Augite-granophyre, intrusion, S. 30° E. of Grigadale, Ardnamurchan. Anal.:...ferrohedenbergites from the Skaergaard intrusion, and with certain others. The Skaergaard pyroxene analyses 1-4...Deer, 1939, p. 240-248; Muir, 1951). In this intrusion, two distinct trend-lines for these late pyroxenes |
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| Element Variation of the Layered Series of the Skaergaard Intrusion and a Re-estimation of the Average Composition...with the further likely assumption that the Skaergaard intrusion is a closed system, at any rate for most...relative volumes of the different parts of the intrusion are tested to find the one best fitting the known...overall composition of the hidden part of the intrusion by subtracting the amounts of an element in the...general view of the changes in composition of the Skaergaard rocks from the early analyses by Dr. (now Professor) |
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| Element Variation of the Layered Series of the Skaergaard Intrusion and a Re-estimation of the Average Composition...with the further likely assumption that the Skaergaard intrusion is a closed system, at any rate for most...relative volumes of the different parts of the intrusion are tested to find the one best fitting the known...overall composition of the hidden part of the intrusion by subtracting the amounts of an element in the...general view of the changes in composition of the Skaergaard rocks from the early analyses by Dr. (now Professor) |
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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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| The clinopyroxenes of the Slcaergaard intrusion, eastern Greenland. By I. D. MWR, B.A., Ph.D., F.G.S. Department...on the analyses of two pyroxenes from the Skaergaard intrusion and both of these are now known to be somewhat...somewhat unusual types. The Skaergaard intrusion which is a strongly fractionated gabbroic complex is...twenty-three analyses of the pyroxenes from this intrusion are now available. Using nineteen of these, new...(fig. 1) for the Skaergaard clinopyroxenes. The Skaergaard intrusion of east Greenland, Tertiary in age |
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| Pyroxenes of the Bushveld Intrusion, South Africa by F. B. ATKINS Department of Geology and Mineralogy...inverted pigeonites from the Bushveld layered basic intrusion. The twenty-three analyses now available are believed...trends are remarkably similar to those of the Skaergaard pyroxene series, but the Bushveld sequence is...most complete known for a single fractionated intrusion. The compositional and other variations of the...accumulation from a slowly cooled and fractionated intrusion of tholeiitic basalt magma. The slight but significant |
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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...to subsolidus inversion of a ferriferous //-wollastonite (Woss) to ferrohedenbergite (Heds~) by previous |
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| activity for this reaction would fall above the wollastonite-larnite curve discussedbelow; this conclusion...(1966) survey of the mineralogy of carbonatites, wollastonite is reported as being "moderately common," but...falls below the curve defined by the larnite-wollastonite reaction (Fig. 1). SILICA ACTIVITY 255 IN...leucite-kalsilite. We have no knowledge of (iron-free) wollastonite precipitating in silica-poor liquids uncontaminated...kalsilite-leucite curve should plot above the wollastonite-larnite curve (Fig. 1). Corqcr,usroNs could |
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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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| in Rocks and Coexisting Minerals of the Skaergaard Intrusion, East Greenland1 by H. p. TAYLOR, JR., and...oxygen-isotopic studies to the Skaergaard intrusion of East Greenland because this intrusive appears...example of magmatic crystallization. The Skaergaard intrusion is a gravitationally layered gabbroic mass...the list of references. At present, the Skaergaard intrusion is one of the most thoroughly studied igneous...September 5, 2015 ABSTRACT The Skaergaard intrusion of East Greenland is a gravitationally stratified |
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| Nigeria, anal., 595; Tenerife, anal., opt., 805; Greenland, anal., 737 Aenigmatite, Nigeria, anal., relation...incompatibility with leucite, 377; Japan, anal., 421; Greenland, anal., 737 Albitite, Sinai, anal., petrogenesis...aluminian Amdrups Fjord, Kangerdlugssuaq, E. Greenland, lamprophyres, gabbros, clinopyroxene, kaersutite...concretes, 315 Anisotropicthermalexpansionof wollastonite, 649 Anorthosite, Nigeria, petr., significance...Island, New Zeaiatul, cymrite, 31 I Apatite, Greenland, anal., 737; Mt. Kenya and Mt Meru, anal., 61i |
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| Plagioclases from the basic tholeiitic plutons o f Skaergaard [3], Stillwater [1], and Somalia [4] show increasing...An29. Similar relationships have been found for Skaergaard plagioclases [3] (An65 - An30) and a plagioclase...coexisting minerals. The other major minerals in Skaergaard, Stillwater, and Somalia gabbros are olivine...possible that the same effect has operated for the Skaergaard, Stillwater, and Somalia gabbros whereby crystallisation...crystallising from them. Data published [3, 17] for Skaergaard clinopyroxenes show Sr from < 10 to 100 ppm while |
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| University, Montréal, QC, Canada H3A2T8 Skaergaard layered intrusion) do not cross the liquid–liquid immiscibility...liquids of ferrobasaltic compositions similar to Skaergaard magma with 5 and 10 wt% P2O5 added to the liquids...crystallization order similar to that observed at Skaergaard and none contained liquid immiscible textures...analogue of a possible parental liquid of the Skaergaard intrusion (Brooks and Nielsen 1978). The second composition...Al, orthoclase for Si and K, hematite for Fe, wollastonite for Ca, olivine for Mg, MnTiO3 for Ti, chlorapatite |
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| Evolution of Gabbroic Pegmatites in the Skaergaard Intrusion, East Greenland by RUNE B. LARSEN 1 * AND C. KENT...ABSTRACT The layered tholeiitic gabbros of the Skaergaard Intrusion contain a large variety of gabbroic pegmatites...intercumulus liquids which were derived from the Skaergaard parental melts. The pegmatitic melts were buoyant...essentially late magmatic products derived from the Skaergaard melt and, therefore, provide us with unique objects...LARSEN AND C. K. BROOKS GEOLOGIC SETTING The Skaergaard Intrusion is an integral part of a major igneous province |
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| IN THE EAST L. R. WAGER, No. 8 SKAERGAARD INTRUSION, GREENLAND E. A. VINCENT AND A. A. SMALES...ABSTRACT In the chilled marginal gabbro of the Skaergaard intrusion are small specksof chalcopyriteand bornire;...representativeof the amount in the 300 kma of original Skaergaard magma. In the layered rocks, up to the latest...sulphurcontent. INTRODUCTION TI-IESkaergaard intrusion is a layeredbasiccomplex in whichstrongcrystal...couldbe SULPHIDES IN SKAERGAARDINTRUSION, E. GREENLAND 857 detectedin hand specimens.Thesewere the |
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| distribution of zirconiumand hafnium in the intrusion, East G)reenland Ekaagwd C. KENT BROOKS* Department...of representative samples from the gkaergaard intrusion. These show that in the sucoessiveresidual liquids...their classic study of trace elements in the Skaergaard intrusion (of which the present work is an extension)...and Hf in the rocks and minerals of the Skaergaard intrusion, with a view to using these data, in comb~ation...adequate representation of the divisions of the intrusion. The Zr contents found are given in Table 1 while |
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| An X-ray study of exsolution phenomena in the Skaergaard pyroxenes. By M. G. Bowr M.A., Ph.D. Dept....have been applied to the pyroxenes of the Skaergaard intrusion. The results for about fifty pyroxene crystals...can in some cases extend our knowledge of the Skaergaard pyroxenes. H E fine-scale textures of pyroxenes...compositions and textures of the pyroxenes of the Skaergaard intrusion, originally described by Wager and Deer...(1957) found that the inverted pigeonites of the Skaergaard rocks do not often retain this orientation, but |
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| saturation in the PGE–Au mineralisation of the Skaergaard intrusion: evidence from melt inclusions Jonas M....Springer Nature 2020 Abstract The Skaergaard intrusion in East Greenland hosts mineralisation of platinum...from 165 to 320 ppm in the lower part of the intrusion, but increases to 349–512 ppm immediately below...and sulphides remains unknown. Keywords Skaergaard intrusion · Platinova Reef · Sulphide saturation ·...inclusions Introduction The Skaergaard intrusion in East Greenland hosts the Skaergaard PGE–Au mineralisation |
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| Tertiary acid glass and the late stages of the Skaergaard and Bushveld intrusions. Such pyroxenes also...olivine P1: Plagioclase, Titanomagnetite. wollastonite. Ferrhoendenbergites occur either associated...fractionation of the Skaergaard intrusion; by Atkins (1969) from the Bushveld intrusion; by McDougall (1961)...and crystallization trends of pyroxenes of the Skaergaard in trusion, British and Icelandic Tertiary acid...Miocene Chemical and in of volcanics, together Skaergaard rocks (OA). circles ferroaugite (2). A-1 |
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| the pyroxenes is compared with that in the Skaergaard intrusion (Muir, 1951). A pyroxene from the Tertiary...with the clinoproxene trend in the Skaergaard intrusion, east Greenland. 1, pyroxene (1) ; 2, pyroxene (17)...toward ferroaugite. 26 R. J. Murray— The Skaergaard. intrusion is of tholeiitic type (Tilley, 1950) and...crystallizing in the ferrogabbros of the Skaergaard intrusion. Paragenesis with Olivine. The olivines...MgO, FeO. Relevant trends from the saturated Skaergaard magma are added for comparison. The trend of |
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| inclusions from the Panzhihua gabbroic-layered intrusion associated with a giant Fe–Ti oxide deposit in...Abstract The ∼ 2-km-thick Panzhihua gabbroic-layered intrusion in SW China is unusual because it hosts a giant...apatite-bearing leucogabbro in the middle zone of the intrusion. The apatite-hosted melt inclusions are light...Si-rich, leucogabbro in the upper part of the intrusion. Keywords Magma unmixing · Crystal mush · Apatite-hosted...Apatite-hosted melt inclusion · Fe enrichment · Layered intrusion Introduction Communicated by Chris Ballhaus. |
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| com/locate/lithos Experimental constraints on the Skaergaard liquid line of descent P. Thy a,⁎, C.E. Lesher...CA 95616, USA Geological Survey of Denmark and Greenland, Øster Voldgade 10, DK-1350 København K, Denmark...modeling the liquid line of descent of the Skaergaard intrusion. A series of melting experiments on chilled...tholeiitic and ferrobasaltic dikes associated with the intrusion is, in combination with existing data, used to...constrained for the layered series of the Skaergaard intrusion. Fractionation of a LZa troctolitic assemblage |
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| the Upper Layered Series, Kap Edvard Holm, East Greenland R. ELSDON Department of Geology, University College...dissolution of magnetite. Higher levels in the intrusion equilibrated at lower temperatures than deeper...content of the magma within the walls of the intrusion. THE Upper Layered Series of the Kap Edvard H...dried at I R O N - T I T A N I U M OXIDES FROM GREENLAND 949 Io5 ~ A known quantity of oxides was fused...standards were used for Fe, V, Ti, Mn, Cr, and Ni; wollastonite was used for Ca, periclase for Mg, quartz for |
