 | | Journal (article/letter/editorial) | | com/locate/epsl 40 Ar/39Ar chronology of the Leucite Hills, Wyoming: eruption rates, erosion rates, and an...48109-1063, USA Department of Geology and Geophysics, University of California, Berkeley, CA 94720, USA Received...1999 Abstract The lamproite lavas of the Leucite Hills, Wyoming comprise an isolated volcanic field of...years. Recent seismic studies indicate that the Leucite Hills volcanic field overlies an abrupt transition...Rise spreading ridge). The trigger for the Leucite Hills magmatism may be related, therefore, to the |  | | Book | | Group Name: Prairie Creek 3.2.2. Group Name: Leucite Hills 3.2.3. Group Name: Smoky Butte 3.2.4. Group...Group Name: Francis 3.2.5. Group Name: Hills Pond 3.2.6. Group Name: Sisimiut 3.2.7. Group Name: Yellow Water...Lamproite Type-Locality Magmatic Fields 4.4.1. Leucite Hills 4.4.2. West Kimberley 4.4.3. Murcia-Almeria...1. Phlogopite 6.1.1. Paragenesis 6.1.2. Leucite Hills, Wyoming 6.1.3. West Kimberley, West Australia 6...Kapamba, Zambia 6.1.9. Sisimiut, Greenland 6.1.10. Hills Pond-Rose Dome, Kansas 6.1.11. Bobi, Ivory Coast |  | Thompson, R. N., Velde, D., Leat, P. T., Morrison, M. A., Mitchell, J. G., Dickin, A. P., Gibson, S. A. (1997) Oligocene lamproite containing an Al-poor, Ti-rich biotite, Middle Park, northwest Colorado, USA. Mineralogical Magazine, 61 (407) 557-572 doi:10.1180/minmag.1997.061.407.08 | Journal (article/letter/editorial) | | containing an Al-poor, Ti-rich biotite, Middle Park, northwest Colorado, USA R. N. THOMPSON Department of Geological...midst of a 2 3 - 2 6 Ma basalt-rhyolite province in Middle Park, NW Colorado. It contains abundant phlogopite...fine-grained groundmass of analcime pseudomorphs after leucite, biotite, potassic fichterite, apatite, ilmenite...F <1.5%. Apart from those elements affected by leucite alteration, both the elemental and isotopic composition...the Leucite |]ills, Wyoming. Its Nd-isotopic model age (TDM = 1.6 Ga) is outside the Leucite Hills range |  | | Journal (article/letter/editorial) | | experimentally for three silica-rich lamproites: hyalo-leucite phlogopite lamproite (Oscar, West Kimberley); sanidine...phlogopite transitional madupitic lamproite (Middle Table Mountain, Wyoming). All samples have extended melting...near-liquidus phase at all pressures in the Middle Table Mountain lamproite. Near-solidus phase assemblages... phlogopite apatite K±Ti-silicate (Middle Table Mountain). In all compositions olivine is never found...two broad groups termed olivine lamproite and leucite lamproite (Mitchell and Bergman, 1991). The latter |  | | Book | | J. Wyllie, (California Institute of Technology, USA). Preface In this book the author attempts to...Physico-chemical constraints for the crystallization of leucite and melilite, their P-T stability together with...pseudoleucite and the problems related to survival of leucite beyond Tertiary due to analcitization are discussed...Incompatible relationship between the mineral pairs, leucite and sodic plagioclase and occurrence of the former...understood from the study of the systems leucite–albite and leucite–albite–anothite under atmospheric pressure |  | Chang, Linlin, Liu, Xi, Wu, Chunming, Liu, Xiaoyang, Li, Guowu (2015) Full and ideal mixing behavior between Zr–Wd (K2ZrSi3O9) and Ti–Wd (K2TiSi3O9): evidences from mineral chemistry, X-ray diffraction pattern and Raman spectrum. Physics and Chemistry of Minerals, 42 (3) 223-234 doi:10.1007/s00269-014-0713-x | Journal (article/letter/editorial) | | Zr–Wd and Ti–Wd in the lamproites from the Leucite Hills, Wyoming, may be due to a chemical composition change...silicate K2ZrSi3O9 was first found in a suite of leucite lamproites from the West Kimberley area of Australia...it was reported in the lamproites from Leucite Hills, Wyoming (Carmichael 1967; Mitchell and Steele 1992)...groundmass of the Middle Table Mountain madupitic lamproite from Leucite Hills, Wyoming (Mitchell and Steele...(Zr/(Ti + Zr) < 0.05), observed in the Middle Table Mountain madupitic lamproite (Mitchell and Steele |  | | Journal (article/letter/editorial) | | rocks, e.g. yakutite (Smyslov 1986), effusive leucite-bearing rocks (Orlova 1987) and a wide variety...% FeO and negligible MnO and MgO (<0.05 wet.%). Table 1 presents data for the extremes of the range of...tausonite crystal. REE-BEARING TAUSONITE 655 Table 1. Representative tausonite compositions. Wt.% oxides...compositions recognised in this work. Fig. 5 and Table 2 illustrate the compositional variation encountered...PEROVSK ITE I 0 / - - - ~ - - A . I0 I SOVER \ HILLS 50~,~ // Ce - S r "'\0o~ _~/~.//,' "~,~EROVSKITE~ |  | | Journal (article/letter/editorial) | | 1940; Mitchell 1985; Jaques et al. 1986), Leucite Hills, Wyoming (Carmichael 1967; Mitchell and Steele 1992)...crystals coexisting with Ti-phlogopite, K-richterite, leucite and priderite or as poikilitic groundmass crystals...the groundmass of the Middle Table Mountain madupitic lamproite (Leucite Hills), where it forms intergrowths...nearsolidus phases in melting experiments of Leucite Hills and Smoky Butte lamproite (Mitchell 1995b; Edgar...study are listed in Table 1 and their theoretical bulk compositions are reported in Table 2. The ®nal materials |  | | Book | | 3. Boshof District . . . 1.8.3.1. Roberts Victor 1.8.3.2. New Elands 1.8.4. Winburg District ... 1.8.5...Kroonstad District .. 1.8.6. Swartruggens District. 1.8.7. Dokolwayo .. 1.8.8. Prieska District 1.8.9. Summary...species) given as prefixes to the root name, e.g., leucite diopside lamproite. These compound names reflect...mineralogical features of the rocks are compared in Table 1.1, from which it is apparent that they differ...megacrystlmacrocryst and primary mineral assemblages. Table 1.1 is based upon previous mineralogical studies |  | | Journal (article/letter/editorial) | | carbonate (Table 1). The second one, L(S), corresponds 2 bearing phonolite and K-rich carbonate (Table 1). The...2-bearing phonolite melt from same (Table(Table 1). 1). Table 100%. Table 1. 1. Compositions Compositions...starting mixtures were prepared: L(S) + L(C) and L(S) (Table 1). Starting materials were prepared using reagent-grade...synthesized at 3 GPa (Table 2), which indicates their contamination with atmospheric water. Table 2. Summary of...starting mixtures, L(S) + L(C) and L(S), are given in Table 1. Experimental conditions and phase proportions |  | | Journal (article/letter/editorial) | | compositions of the studied systems are given in Table 1 in comparison with a range of the upper continental...their mole fractions (MFP) are PT summarized in Table 2. See also Tables S1 in Supplementary materials...balance calculations are given in Table S2 RI in mol% and Table S3 in wt%. SC In run no. D070, the...phase enriched in K2O, TiO2, and SiO2 (Fig. 3b, Table 2). The latter forms tiny grains (≤ 5 μm), which...wadeite-structured K2Si4O9. The measured AC composition (Table 2) is close to the K2TiSi3O9 wadeite synthesized |
|
