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| Abstract A calcite-rich block in nephelinitic agglomerate at Oldoinyo Lengai comprises Sr-calcite, apatite...slopes of the volcano. It was identified as a calcite carbonatite by the Tanganyika Geological Survey...roughly-equidimensional calcite patches up to l mm, but in other parts the calcite takes the form of laths...needles being up to 1 mm in length (Fig. 2) The calcite patches, laths and needles are not single crystals...crystals but consist of numerous tiny coalescing calcite grains. The individual lathes and needles are morphologically |
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| - K - C a carbonatite magmas which crystallize calcite cannot fractionate to nyerereite+gregoryite + liquid...inappropriately applied to other eruptive rocks with calcite phenocrysts, and the only known occurrence of gregoryite-bearing...aggregates in some nyerereite as inclusions of calcite. Nyerereite occurs as plates which appear euhedral...analysis of carbonates were: for CaO and CO2, calcite; for Na20, NazCO3 ; K20, K2CO3 ; SO3, anhydrite;...0.1 I 0.2 I 0.3 ) 0.4 f 05 / // / nyer+ calcite cotectic ,/ Cc Fig. 5. Projections of the compositions |
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| MINERALS AND PARAGENESES OF MINERALS Nyerereite from Calcite Carbonatite at the Kerimasi Volcano, Northern Tanzania...98. A few inclusions in magnetite also contain calcite, which is considered here to be a latestage, subsolidus...were originally alkaline rich and contained both calcite and nyerereite as primary minerals. DOI: 10.11...1997; Zaitsev et al., 2004; Sokolov et al., 2006). Calcite is a typical daughter mineral in fluid inclusions...contain only calcite as a carbonate mineral. During a mineralogical investigation of calcite car bonatite |
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| applied to a complex of related carbonate and silicate rocks in a magmatic or extrusive complex. Primary...kimberlite clans, with the latter best being termed calcite kimberlites. Each magma type and associated carbonatites...fractional crystallization or liquid immiscibility. Calcite kimberlites are smallvolume late-forming differentiates...manifestations préférablement appelées kimberlites à calcite. Chaque type de magma et les carbonatites associées...fractionnée ou immiscibilité liquide. Les kimberlites à calcite seraient des différenciés tardifs à volume limité |
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| wollastonite does occur as xenocrysts replaced by calcite in some caldera lavas; Peterson (1987, 1988) attributed...experiments with a perovskite ijolite from the Ice River Complex, British Columbia, showing the effect of crystallization...pyroxenites (jacupirangites) of the Ice River Complex, British Columbia (Currie 1975). Mitchell (1980)...of composition of clinopyroxenes from the Fen complex, Norway; the most primitive rock types there (damkjernites)...ijolites are also found at both the Ice River Complex and at Fen. Note that the A1 content of these pyroxenes |
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| composition. They consist of either shortite–northupite–calcite 2 ACCEPTED MANUSCRIPT assemblages or zoned aggregates...minerals of the Afrikanda ultramafic–alkaline complex (Zaitsev and Chakhmouradian, 2002). It was identified...Sokolov et al., 2006); (ii) calcite-rich carbonatites from the Oka carbonatite complex (Chen et al., 2013);... MA kimberlite field in the Yakutian diamond province (Siberian craton). The pipe has a composite structure...western) coupled bodies, which have undergone a complex history and consist of various kimberlite units |
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| individual chapters: i) the carbonatitic-alkaline province outcropping on the Kenya-Uganda border which have...Petrogenesis of the volcanic rocks of the Karoo Province edited by ERLANK (1984). In addition, a review...review paper related to this volcanic province appeared in the book devoted to the Flood Basalts Provinces...138 139 142 146 146 5 The Mesozoic Tholeiitic Province of Northwest Africa: A Volcanotectonic Record......................... 5.1 The Thghouaji Ring-Complex ...................... 5.2 Conclusion ........ |
