 | | Journal (article/letter/editorial) | | Leucite Hills, Wyoming and the Highwood and Bearpaw Mountains, Montana. Such statements are not supported...the Leucite Hills, Highwood, Bearpaw Mountains and the Smokey Butte regions of Montana; the Moon Canyon...conditions in the underthrust slab may be such that phlogopite breaks down (c.f. Modreski and Boettcher 1972...O 0 i d? o i O O O0 0 9 84 h >-200 (W USA) -1- rn 8 O o 0 ~- 6 ++ + ~ + [] • +...vs SiO2 diagram for high K rocks of the Western USA o Leucite Hills, Wyoming (Yagi and Matsumoto 1966; |  | | Journal (article/letter/editorial) | | 76(4), pp. 1005–1051 The Highwood Mountains potassic igneous province, Montana: mineral fractionation trends...mafic dykes and lavas from the Highwood Mountains Igneous Province, USA were studied by electron-microprobe...mixing, phase equilibria. Introduction THE Highwood Mountains potassic volcanic complex (Fig. 1) is part...part of a larger igneous province in Montana, USA, which was active during the Eocene period. The volcanic...contemporaneous nearby Bearpaw Mountains Complex. The Highwood Mountains Complex was first described by |  | | Journal (article/letter/editorial) | | lithospheric mantle: isotopic evidence from the Shonkin Sag sill (Montana) Received: 1 November 2001 / Accepted:...ages using Shonkin Sag data and published analyses for magmas of the Cenozoic Wyoming-Montana alkaline...resembles a subduction imprint on Cenozoic southwestern USA basalts (SWUSAB). However the latter give Proterozoic...also consistent with high d18O values for the Shonkin Sag. Low TiO2 in WYMAP may reflect a J.D. Greenough...investigation. Introduction Extension-related south-western USA basalts (SWUSAB) have a geochemical signature which |  | | Journal (article/letter/editorial) | | with the position of the Benioff Zone. Western USA Only two of the "best documented localities" referred...leucite from these rocks. The rocks of the Shonkin Sag Laccolith described by Nash and Wilkinson (1970) contain... the Shonkin Sag rocks should not be considered leucite-bearing rocks. In the Bearpaw Mountains Rattlesnake...the Rattlesnake Quadrangle Bearpaw Mountains Blaine County, Montana. US Geol Surv Bull 1181-B: 66pp Nash...Nash WP, Wilkinson JFG (1970) Shonkin Sag Laccolith, Montana, I. Mafic minerals and estimates of temperature |  | | Journal (article/letter/editorial) | | solubility of Ti in phlogopites. This suggests that phlogopite in high-K rocks may be a potential geothermometer...possibly a geobarometer. Abstract. Introduction Phlogopite is the only common mineral stable under mantle...Forbes and Flower 1974). This suggests that Ti-phlogopite may also be an important source of Ti in the...during breakdown of Tibearing phlogopite at mantle depths. Phlogopite compositions from megacrysts and...temperature, fO2, etc. in the solubility of Ti in the phlogopite as well as its modes of substitution is necessary |  | | Journal (article/letter/editorial) | | 1 mm in length, coexisting with diopside, Ti-phlogopite, K-richterite, leucite and priderite (Prider...microphenocrysts of diopside, phlogopite and leucite in the madupite and with diopside, phlogopite, K-richterite and...1974) but within the stability conditions of phlogopite (Modreski and Boettcher 1972). The present study... and hence provide a mineral, in addition to phlogopite, which might contain K under the proposed mantle...wadeite contains approximately twice as much K as phlogopite and large amounts of Zr (an uncommonly abundant |  | | Journal (article/letter/editorial) | | Montana Mineral Locality Index Downloaded by [University of Nebraska, Lincoln] at 20:00 09 April 2015...2015 K NOWN AS THE TREASURE STATE, Montana is rich in mineral and gemstone localities. The state motto...The middle third of the state is known as the Montana alkali province where the sediments have MICHAEL...Indian Queen mine ca. 1905 at Farlin, Beaverhead County. 208 ROCKS & MINERALS Downloaded by [University... the Rocky Mountains, and furthest to the northwest, the belt basin. The Rocky Mountains contain sedimentary |  | | Journal (article/letter/editorial) | | minerals. The calculated partition of fluorine in phlogopite agrees well with published results; the distribution...of fluorine and hydroxyl between apatite and phlogopite is temperature dependent and has been calculated...arise from late-stage exchange of the fluorine in phlogopite with an aqueous fluid, for which independent...detectable F , coexists with fluorine-rich (Cl-poor) phlogopite a n d a p a t i t e (Table 2) (Stormer a n d...cations Mg or A1, a n d the s t r u c t u r e of phlogopite or muscovite can be represented b y a central |  | | Journal (article/letter/editorial) | | in the lavas. Equilibrium fusion of a mantle phlogopite-bearing peridotite combined with subsequent fractionation...4), similar to the soda-syenite from the Shonkin Sag laccolith (Nash and Wilkinson, 1970, p. 244, Anal...resembles the trend of compositions from the Shonkin Sag laccolith and some of the Alban Hills lavas. 4) The...(Le Maitre, 1962), St. Helena (Baker, 1969), Shonkin Sag (Nash and Wilkinson, 1970), New South Wales leucitites...M x biotite xenocryst; Mg ground mass biotite-phlogopite; A x amphibole xenocryst; U ulv6spinel; I ilmenite |  | | Journal (article/letter/editorial) | | dash-dot line. Generalized trend of the Shonkin Sag laccolith (Hurlbut, 1939, table 2, p. 1071) by dotted...coexisting with forsterite, or forsterite and phlogopite, in the presence of an aqueous vapor phase, show...variation with the generalized trend of the Shonkin Sag laccolith, which can be confidently regarded as crystallized...HURLBUT, C. S., 1939. Igneous rocks of the Highwood Mountains, Montana. Part I. Bull. geol. Soc. Am. SO, 1043-1112 |  | | Journal (article/letter/editorial) | | provide information on phase relations involving phlogopite, potash feldspar, leucite, KAlSiO4, MgSiO3, forsterite...feldspar, orthorhombic enstatite, forsterite, and phlogopite. A vapor phase was present in all runs. The evidence...given in Figure 1, except An, anthophyllite; Ph, phlogopite; L, water-saturated liquid, and V, the aqueous... W. C. LUTH—SYSTEM KAlSiO4-Mg2SiO4-SiO2-H2O phlogopite were noted in the glass and are believed to represent...to Figs. 1 and 2. The anhydrous composition of phlogopite is also shown. determine the temperature precisely |  | | Journal (article/letter/editorial) | | fairly homogeneous and consist of diopside-salite, phlogopite, biotite, alkali-feldspar, aegirinic pyroxenes...Alkaline Subvoicanites t 79 salitic pyroxene ~ phlogopite -+ biotite plus aegirinic pyroxene -+ felsic...(diopside-salite, Mg-hastingsitic hornblende, ofivine, phlogopite and opaques). Table 1. ChemicalAnMyses of the...Nash and Wilkinson (1970), working on the Shonkin Sag laccolith, have shown that acmitic pyroxenes can crystallize... W. P., Wilkinson, J. F. G., 1970: Shonkin Sag Laccolith, Montana. I. Mafic minerals and estimates of |  | | Book | | ofIndonesia ........... Volcanic Fields of Highwood Mountains, Montana (USA) . . . . . . . . . . . . . . . . ...avaj o-Hopi Province (USA) . . .. Leucite-Bearing Rocks of Leucite Hills, Wyoming(USA) . . . . . . . . ....The System KAlSi04-Mg2Si04-Si02-H20 ...... 161 Phlogopite Stability ...................... 166 Potassic...Considerations for the Conversion of a Katungite to a Phlogopite Pyroxenite at High Pressures . . . . . . . ....Mafic and Ultramafic Magma by Partial Melting of Phlogopite-Bearing Ultramafic Upper Mantle ..... 224 18 |  | | Journal (article/letter/editorial) | | 8 wt.% ZrO2 in an arfvedsonite from the Shonkin Sag laccolith; Larsen (1976) reports 0.78 wt.% from an...that olivine reacted with the liquid to give phlogopite and clinopyroxene depending upon the exact starting...Forsterite + liquid > phlogopite + diopside + vapour Forsterite + liquid > phlogopite + vapour (5) (6) ... W.P. and Wilkinson, J.F.G. (1970) Shonkin Sag laccolith, Montana. I. Ma c minerals and estimates of |  | | Journal (article/letter/editorial) | | within the diorite body. It contains a reddish phlogopite as well as turbid apatite, o r t h o p y r o...Hamilton 1982). Thus, in plutonic rocks, biotite, phlogopite and alkali feldspar, not leucite, are the diagnostic...and Simpson 1984); HM, Shonkinite from Highwood Mountains, Montana (O'Brien et al. 1988); ML and CQ, metamorphic...felsic or mafic rocks. For example, the Shonkin Sag laccolith (Larsen 1940; Nash and Wilkinson 1970) is...plagioclase in association with clinopyroxene and phlogopite is unique to Group-III rocks, and the A1 contents |  | | Journal (article/letter/editorial) | | (5 analyses) Average analysis usingfluorian phlogopite as F standard (4 analyses) Uncertainty' Weight...Calculatedby Equation 3 (see text). synthetic fluorian phlogopite (9.01 wt0/oF, synthesizedby D. Wones and provided...amphibolite facies marbles in the Adirondack mountains of easternNew York (Valley et al., 1983).Valley...that include nepheline syenites in the Shonkin Sag laccolith, Montana (Nash and Wilkinson, 1970) and garnet-ijolite...zeolites, and nepheline at both localities. At Shonkin Sag, sanidine and arfvedsonite are part of the primary |  | | Journal (article/letter/editorial) | | AMERICAN MUSEUM OF NATURAL HISTORY, NEW YORK, NY 10024, USA RECEIVED MARCH 6, 2006; ACCEPTED OCTOBER 30, 2006;...wall pyroxenite. Among the differences are (1) phlogopite, K-feldspar, and quartz are ubiquitous and locally...clinopyroxene, and minor but variable amounts of phlogopite and other accessory phases. In several respects...chromite; qtz þ k-felds, quartz þ K-feldspar; phl, phlogopite. The scale on the left refers to metres below...occupying interstices around orthopyroxene. Third, phlogopite, K-feldspar, and quartz are ubiquitous in the |  | | Journal (article/letter/editorial) | | relatively broad but similar to literature values phlogopite,diopsidicclinopyroxene,and yellowish-green for...The requirementthat the secondphase,relativeto phlogopite, be poorer in SiOz, rich in Al2O3, and not drastically...however, nullify the proposition that a mixture of phlogopite and someother phyllosilicate exists on anything...wt.Vochlorite would have to be mixed with the phlogopite in order to produce the mean, not the lowest...these and other components that may enter the phlogopite at the time of its crystallization. That the |  | | Journal (article/letter/editorial) | | Seabrook Lake, TIO2=4.9-5.7%, Mitchell, 1972; Shonkin Sag, TIO2=1.3-3.3%, Nash and Wilkinson, 1970) but...replacing pyroxene have been described from Shonkin Sag (Nash and Wilkinson, 1970), Iron Hill (Nash,...schorlomite; And. andradite; Ant: annite; Phl: phlogopite; Mng : manganophyllite nepheline-bearing rocks... 261 9 POOHBAHLAKE 9 IRON HILL [] BORRALAN SHONKIN SAG 9 CROWSNESTPASS SCHORLOMtTE 30 . o\O ao/ ANDR...from alkaline rocks. Poohbah Lake (this work), Shonkin Sag (Nash and Wilkinson, 1970), Iron Hill (Nash, |  | | Journal (article/letter/editorial) | | differences are interpreted in terms of melting with phlogopite as a residual phase, with smal!er degrees of...95% confidence level. All analyses obtained on phlogopite separates. The separate from 265879 was a mixture...proportions of calcite, dolomite, olivine, diopside, phlogopite and magnetite, with accessory apatite, pargasitic...age determinations are by the K-Ar method on phlogopite separates. U M L ~ ultramafic lampr,aphyre (n)...megacrysts ofanorthoclase, phlogopite and green clinopyroxene, and phenocrysts of phlogopite, clinopyroxene, magnetite |  | | Journal (article/letter/editorial) | | Johns Hopkins University, Baltimore, MD 2 1218, USA (Received December 5, 1991;accepted in revisedform...all referred to compositional endmembers, e.g., phlogopite and annite. In minerals with variable octahedral...Hole OceanographicInstitution,Woods Hole, MA 02543, USA. 3435 C. Zhu and D. A. Sverjensky 3436 In this...Anorthite Biotite Garnet K-feldspar Muscovite Phlogopite An Bt CaAl$$Og K(~g,Fe~~~AlSi~Ol~lCF,c1,OH~~...1983). Review of F-OH exchange experiments in phlogopite, muscovite, and annite found that ideal mixing |  | | Journal (article/letter/editorial) | | rocks are generally formed by partial melting of phlogopite-bearing peridotites within the upper mantle....(1967), Stability of phlogopite at high pressures and possible presence of phlogopite in the earth's upper...and Buie, B.F. (1941), Igenous rocks of the Highwood Mountains. Geol. Soc. Am.Bull., 52, 1733— 1868. Mitchell-Thome...W.P. and Wilkinson, J.F.G. (1970), Shonkin Sag laccolith, Montana. I. Mafic minerals and estimates of... (1936), Pliocene volcanoes of the Navajo-Hopi county. Geol. Soc. Am. Bull., 47, 111-172. Wimmenauer |  | | Journal (article/letter/editorial) | | outcrops for the 140 miles from Pulaski County to Miller County. Representative samples of the clays used...occupied this area during Eocene time. TIIE SHONKIN SAG LACCOLITH REYISITED JUI,IAND. BARKSDALE University...the author that the gross layering in the Shonkin Sag laccolith is due to differentiation in place from...contacts between the various rock types in the laccolith are thought to be due to auto-injection caused...pyrite, marcasite, and KH2POa. CORUNDUM DEPOSITS OF MONTANA* STEPIIEN E. C]-ABAUGI{ University of Texas, Austin |  | | Journal (article/letter/editorial) | | outcrops for the 140 miles from Pulaski County to Miller County. Representative samples of the clays used...occupied this area during Eocene time. TIIE SHONKIN SAG LACCOLITH REYISITED JUI,IAND. BARKSDALE University...the author that the gross layering in the Shonkin Sag laccolith is due to differentiation in place from...contacts between the various rock types in the laccolith are thought to be due to auto-injection caused...pyrite, marcasite, and KH2POa. CORUNDUM DEPOSITS OF MONTANA* STEPIIEN E. C]-ABAUGI{ University of Texas, Austin |  | | Journal (article/letter/editorial) | | complexes are included for comparison. l=Shonkin Sag laccolith (Nash and Wilkinson, 1970), Z=Ilimaussaq...based on 22 Oxygens. 3Phl=nhloaooite. Ann=annite. Phlogopite and annite endmembers tion techni&ks as outlined... W.P. and Wilkinson, J.F.G., 1970. Shonkin Sag Laccolith, Montana. I. Matic minerals and estimates of |
|
