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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...combining field observations, petrography and anorthite contents of plagioclase with bulk rock Ti, V,...plagioclase core anorthite contents. The mirror images of the crystallization sequences and the anorthite contents...plagioclase cores in the three series imply that the Skaergaard magma chamber solidified by in situ crystallization |
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| on experimental plagioclase equilibria and the Skaergaard liquidus temperature Peter Thy,1,* Charles E...that previous data for understanding the Skaergaard intrusion potentially suffered from the analytical...melt. Application of the results to modeling the Skaergaard requires only minor adjustments to the previously...Plagioclase, melting experiments, equilibrium, Skaergaard intrusion, liquidus temperature Introduction Plagioclase...melting experiments involving ferrobasalts with Skaergaard affinities (e.g., Biggar 1974; Hoover 1989; Juster |
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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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| plagioclases in layered gabbros of the Skaergaard intrusion, east Greenland. By J. M. CAI~R,M.A., D.PnIL., F...to the main layered series of the Skaergaard intrusion, east Greenland (Wager and Deer, 1939). The work...4~ ~ § ~ o'. ~1 ZONED I~LAGIOCLASES,SKAERGAARD,GREENLAND 369 representing the bulk felspar composition...composition of no more than six or seven parts anorthite. Of the three gabbros from which felspars have...in a compositional range of about 7 parts of anorthite. The innermost parts of tile crystals are An59 |
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| 1371–1376, 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 °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 |
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| 1007/s00410-007-0245-1 ORIGINAL PAPER Plagioclase in the Skaergaard intrusion. Part 1: Core and rim compositions in the...September 2007 Ó Springer-Verlag 2007 Abstract The anorthite content of plagioclase grains (XAn) in 12 rocks...rocks from the layered series of the Skaergaard intrusion has been studied by electron microprobe (typically...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 |
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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 Upper Layered Series, Kap Edvard Holm, East Greenland by R. E L S D O N Department of Geology, The...Kangerdlugssuaq Fjord, East Greenland, approximately 10 miles south-west of the Skaergaard intrusion. It consists of...Middle Layered Series and other intrusions such as Skaergaard, Stillwater, and Bushveld, where initial subdivision... UPPER LAYERED SERIES, KAP EDVARD HOLM, EAST GREENLAND 501 1. gentle, continuous, thermal currents,...exhibited by the gabbro cumulates of the Skaergaard intrusion. In the latter case it has been postulated |
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| intrusions, including the Skaergaard Intrusion (East Greenland) and the Kiglapait Intrusion (Labrador, Canada)...contamination, Kiglapait, isotopic zonation of individual Skaergaard, Rum plagioclase crystals has also been identified...identified from intrusions such as the Rum Intrusion (Scotland) INTRODUCTION and the Bushveld Igneous Complex...classic layered intrusions: the Kiglapait and Skaergaard intrusions. timescales. This lack of equilibration...plagioclase ranges from the pure Ca limit 1553 [anorthite (An), CaAl2 Si2O8 ] to the pure Na limit [albite |
 | Holness, M. B., Stripp, G., Humphreys, M. C. S., Veksler, I. V., Nielsen, T. F. D., Tegner, Christian (2011) Silicate Liquid Immiscibility within the Crystal Mush: Late-stage Magmatic Microstructures in the Skaergaard Intrusion, East Greenland. Journal of Petrology, 52 (1) 175-222 doi:10.1093/petrology/egq077 | Journal (article/letter/editorial) |
| Magmatic Microstructures in the Skaergaard Intrusion, East Greenland 1 DEPARTMENT OF EARTH SCIENCES...GERMANY 4 GEOLOGICAL SURVEY OF DENMARK AND GREENLAND, STER VOLDGADE 10, DK-1350 COPENHAGEN K, DENMARK...the last stages of solidification of the Skaergaard intrusion comprise a wide array of reactive and non-reactive...the bulk liquid. KEY WORDS: immiscibility; Skaergaard; crystal mush I N T RO D U C T I O N Solidification...symplectitic intergrowths of orthopyroxene þ anorthite (with local, replacive amphibole) between primocrysts |
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| The concept that rocks of the Skaergaard Layered Intrusion, East Greenland, consist of precipitate and...layered intrusions but particularly those from the Skaergaard and Rhum intrusions. They suggested that when...to apply the method to two rocks from the Skaergaard intrusion. The results obtained are in agreement with...relationship between plagioclase modal proportion and anorthite content of the plagioclase, it is to be expected...expected that plagioclases of relatively low anorthite content would be a result of fast and not slow crystal |
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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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| T. Rosing 9 C. Kent Brooks Evolution of the Skaergaard magma: evidence from crystallized melt inclusions...plagioclase grains in the Middle Zone of the Ska~rgaard intrusion. The chemistry of the minerals in the aggregates...of the contemporaneous melt of the Sk~ergaard intrusion. Through mass balance calculations a quantitative...of the melt composition for this level in the intrusion can be obtained, and this estimate confirms that...described by Wager and Deer (1939), the Ska~rgaard intrusion has been regarded as a type example of extreme |
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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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| from QFM to QFM –2, and Upper Zone a of the Skaergaard intrusion from QFM –1 to QFM –1.5. Editorial responsibility:...Comparison of measured liquid temperature (a), anorthite content of plagioclase (b), and FeOT of plagioclase...exceed ±75 C in liquid temperature, ±0.1 in anorthite content, and ±70% in FeOT in plagioclase ([FeOTmeas...between plagioclase and liquid as a function of anorthite content in plagioclase for (a) tholeiite and FeTi-tholeiite...calc-alkaline and (c) alkaline liquid compositions. The anorthite content is the atomic ratio Ca/(Ca+Na+K). Shown |
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| M I N E R A L S O F T H E S K A E R G A A R D INTRUSION E.A. VINCENT and G. NIGHTINGALE Department of...1974. Gallium in rocks and minerals of the Skaergaard intrusion. Chem. Geol., 14: 63--73. Gallium has been...analysis in a suite of 26 rocks from the Skaergaard intrusion and in the separated cumulus minerals of...elements in the rocks and minerals o f the Skaergaard intrusion was s u m m a r i s e d b y Wager and B...o f gallium in the rocks and minerals o f the intrusion was d e t e r m i n e d b y the early w o r k |
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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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| Processes in Mafic Magma Chambers: I. The Kiglapait Intrusion, Labrador by DONALD J. DEPAOLO Department of...cumulate rocks and minerals of the Kiglapait intrusion are pertinent as indicators of the processes that...indicates that the crystallization age of the intrusion is 1305 ±22 million years. The initial em values...5-6 in the Upper Zone and correlate with the anorthite content of plagioclase. The initial 87Sr/86Sr...monotonically up-section (decreasing plagioclase anorthite content) to 0-7068 in the Upper Zone. These variations |
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| and Sr/Ca ratio in plagioclases with decreasing anorthite content does not necessarily imply either increasing...Plagioclases from the basic tholeiitic plutons o f Skaergaard [3], Stillwater [1], and Somalia [4] show increasing...increasing Sr and Sr/Ca ratios with decreasing anorthite (An) contents. The usual interpretation o f this...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 |
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| 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 |
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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...Pyroxene-granophyre A Quartz Orthoclase Albite Anorthite Diopside Hypers thene Magnetite llmenite Apatite... (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 |
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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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| post-solidification history of the Skaergaard Intrusion, East Greenland☆ Marian B. Holness a,⁎, Chris Richardson...Cumulate Layered intrusion a b s t r a c t The Skaergaard Intrusion of East Greenland is cut by several...have intruded shortly after solidification of the Skaergaard. Two ~6 m wide doleritic dykes from the earliest...in the campsite area near Homestead Bay of the Skaergaard Peninsula. One of the dykes (the Campsite Dyke)...Campsite Dyke is the older of the two, intruding the Skaergaard when it had cooled to 920–970 °C. The Plagioclase-phyric |
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| of rocks in the upper zones of the Skaergaard intrusion (Greenland), the Am phenomenon may be seen to...rocks consist mainly of plagioclase (70 - 95 wt.% anorthite, CaA12Si2Os). Sr, Ba and Eu are concentrated in...and (b) of the upper layers of the Skaergaard intrusion (Greenland). Abundances for the Am stars are normalized...for the Moon - to C1 chondrites, for the Skaergaard intrusion - to the composition of the original magma...(SHR) representing the uppermost layer of the intrusion are considered to have resulted from crystallization |
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| plagioclase in the gabbro. No combination of the anorthite-Ca-Tschermakite (AnCaTs) and forsterite-enstatite...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 |
