Mineralogical Magazine

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Crystal chemistry and intracrystalline relationships of orthopyroxene in a suite of high pressure ultramafic nodules from the ‘Newer Volcanics’ of Victoria, Australia
Mineralogical Magazine - Tập 58 Số 391 - Trang 325-332 - 1994
G. Molin, M. Stimpfl
AbstractA suite of orthopyroxenes from spinel Iherzolite xenoliths associated with basanites occurring in the Victorian (Australia) post-Pliocene ‘Newer Volcanics’ province was investigated by means of a crystal chemical methodology which provides accurate site occupancy and site configuration parameters.The M1 configuration is essentially constrained by AlVI rather than Fe2+. In addition, Fe3+, C... hiện toàn bộ
Crystal chemistry and significance of cation ordering in Mg-Al rich spinels from high-grade hornfels (Predazzo-Monzoni, NE Italy)
Mineralogical Magazine - Tập 63 Số 2 - Trang 257-262 - 1999
Francesco Princivalle, A. Della Giusta, Ângelo De Min, E. M. Piccirillo
AbstractTwo Mg-Al spinels (FAS1 and FAS2) in high-grade hornfels from the Toal de Mason skarn (Predazzo Monzoni, NE Italy) were investigated by means of single crystal X-ray diffraction and electron microprobe analysis in order to evaluate the last intra-crystalline closure temperature.The evidence provided by crystal chemical data from the investigated spinels, compared with that for two other sp... hiện toàn bộ
Pyrite-pyrrhotine redox reactions in nature
Mineralogical Magazine - Tập 50 Số 356 - Trang 223-229 - 1986
A. J. Hall
AbstractThe origin in rocks of the common iron sulphides, pyrrhotine, Fe1-xS and pyrite, FeS2 and their behaviour during geochemical processes is best considered using the simplified redox reaction: 2FeS ⇌ FeS2 + Fe2+ + 2e−.Thus pyrrhotine is more reduced than pyrite and is the stable iron sulphide formed from magmas except where relatively high oxygen fugacities result from falling pressure or hy... hiện toàn bộ
Trace Element Accessibility in Mid-Ocean Ridge and Ocean Island Basalt: An Experimental Approach
Mineralogical Magazine - Tập 58A Số 1 - Trang 329-330 - 1994
U. Giese
Oriented biotite inclusions in diamond coat
Mineralogical Magazine - Tập 56 Số 382 - Trang 108-111 - 1992
Jan Walmsley, A. R. Lang
On sub-micrometre inclusions in diamond coat: crystallography and composition of ankerites and related rhombohedral carbonates
Mineralogical Magazine - Tập 56 Số 385 - Trang 533-543 - 1992
Jan Walmsley, A. R. Lang
AbstractCrystallographic studies of micro-inclusions in diamond coat, carried out by analytical electron microscopic techniques, show that structures possessing rhombohedral symmetry form a significant fraction of the population of well-crystaUised particles. They are, however, less frequent than apatite or biotite, which were identified earlier by the same investigative methods. Thin-foil specime... hiện toàn bộ
Carbonatitic melts in cuboid diamonds from Udachnaya kimberlite pipe (Yakutia): evidence from vibrational spectroscopy
Mineralogical Magazine - Tập 68 Số 1 - Trang 61-73 - 2004
D. A. Zedgenizov, Hiroyuki Kagi, V. S. Shatsky, N. V. Sobolev
AbstractMicro-inclusions (1 –10 μm) in 55 diamonds of cubic habit from the Udachnaya kimberlite pipe have been studied using vibrational spectroscopy. This has revealed a multiphase assemblage in cuboid diamonds from the Udachnaya kimberlite pipe. This assemblage includes carbonates, olivine, apatite, graphite, water and silicate glasses. The micro-inclusions preserve the high internal pressure an... hiện toàn bộ
TheREE-and HFSE-bearing phases in the Itatiaia alkaline complex (Brazil) and geochemical evolution of feldspar-rich felsic melts
Mineralogical Magazine - Tập 81 Số 2 - Trang 217-250 - 2017
Leone Melluso, Vincenza Guarino, Michele Lustrino, Vincenzo Morra, Roberto dè Gennaro
AbstractThe Late Cretaceous Itatiaia complex is made up of nepheline syenite grading to peralkaline varieties, quartz syenite and granite, emplaced in the metamorphic rocks of the Serra do Mar, SE Brazil. The nepheline syenites are characterized by assemblages with alkali feldspar, nepheline, Fe-Ti oxides, clinopyroxene, amphibole, apatite and titanite, while the peralkaline nepheline syenites hav... hiện toàn bộ
Mineral replacement reactions: from macroscopic observations to microscopic mechanisms
Mineralogical Magazine - Tập 66 Số 5 - Trang 689-708 - 2002
Andrew Putnis
AbstractMineral replacement reactions take place primarily by dissolution-reprecipitation processes. Processes such as cation exchange, chemical weathering, deuteric alteration, leaching, pseudomorphism, metasomatism, diagenesis and metamorphism are all linked by common features in which one mineral or mineral assemblage is replaced by a more stable assemblage. The aim of this paper is to review s... hiện toàn bộ
The catalysis of mineral reactions by water and restrictions on the presence of aqueous fluid during metamorphism
Mineralogical Magazine - Tập 50 Số 357 - Trang 399-415 - 1986
D. C. Rubie
AbstractThe problems of characterizing inter-granular regions and of estimating rates of intergranular diffusion in metamorphic rocks are discussed. Inter-granular regions can be anhydrous, hydrated but under-saturated with H2O, or saturated with H2O, but only in the latter case can a free aqueous fluid phase be present. Estimates of intergranular diffusion coefficients (DIGR) at 550°C derived fro... hiện toàn bộ
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