 | | Journal (article/letter/editorial) | | Engineering, University of Dar Es Salaam, Dar Es Salaam, Tanzania open system with carbonate–silicate immiscibility...Liquid immiscibility · Rift initiation · Hanang · Tanzania · East African Rift Introduction The East African...structural and magmatic features of the North Tanzania Rift. Volcanoes: B. Burko, Em. Embagai, Es. Essimingor... Oldoinyo Lengai, OS. Ol Donyo Sambu, P. Pello hill, Sd. Sadiman, S. Shira, Sh. Shombole, T. Tarosero...boundary extension, from the initiation of the rift (Tanzania, Manyara basin) to oceanic accretion (Afar Triple |  | | Journal (article/letter/editorial) | | phiogopites in coarse, depleted gantetqherzolite xenoliths from kimberlites. Most secondary-textured phlogbpites...result from inf'dtration of ldmberlite into peridotite xenoliths. A good correlation between P arid F in...and that wh/tlockite is not present in the source region. Mantle-derived mica and amphibole have such low...placed on the above three minerals in upper-mantle xenoliths and host kimberlites. A kaersutite megacryst in...ba~alt and kimberlite and their incorporated xenoliths. Colorimetric analyses of F, CI and I in Aft'lean |  | | Journal (article/letter/editorial) | | harzburgitic xenoliths of eastern Antarctica shows that the upper mantle of this region has been affected...Keywords: henrymeyerite, mantle metasomatism, xenoliths, eastern Antarctica. Sommaire D’après une étude...incompatible elements. Studies of xenoliths of upper-mantle peridotite and tectonically emplaced mantle...The interaction of such melts or fluids with peridotite wallrocks results in the formation of minerals...Labait volcano, Tanzania, in Ti- and Ba-containing metasomatized mantle-derived xenoliths. He described |  | | Journal (article/letter/editorial) | | (2006) CALCIOCARBONATITE DYKES AT OLDOINYO LENGAI, TANZANIA: THE FATE OF NATROCARBONATITE Jörg KELLER§ Institut...active natrocarbonatite volcano Oldoinyo Lengai, Tanzania. The dykes are fine grained, with a microporphyritic...magnetite (up to 10.2 wt.% MnO), REE- and Si-rich fluorapatite (up to 20.6 wt.% REE2O3 and 9.9 wt.% SiO2) and...mineralogy, chemical balance, stable isotopes, Tanzania. Sommaire Nous décrivons pour la première fois... magnétite riche en Mn (jusqu’à 10.2% MnO), fluorapatite riche en terres rares et Si (jusqu’à 20.6% d’oxydes |  | | Journal (article/letter/editorial) | | Evidence from spinel lherzolite and wehrlite xenoliths A.D. Beard a,⁎, H. Downes a , P.R.D. Mason b ...Abstract A suite of spinel lherzolite and wehrlite xenoliths from a Devonian kimberlite dyke near Kandalaksha...estimates and Fo content in the spinel lherzolite xenoliths reveal that the lithosphere beneath the Archaean–Proterozoic...pargasite, apatite and picroilmenite in the xenoliths. Wehrlite xenoliths are considered to represent localised...from 775 to 969 °C for the spinel lherzolite xenoliths and from 817 to 904 °C for the wehrlites. Laser |  | | Journal (article/letter/editorial) | | (1975) Mineral chemistry of peridotite xenoliths from the Lashaine volcano, Tanzania. In Physics urril C~z~~~~...Muntle, (editors Summersgill and Bradley). McGraw-Hill. WILSHIREM. G.. SCHWARZMAN E. G. and TRASHY N.... J. (1971) Distribution of ultramafic xenoliths at I? N. American sites. U.S. Dept. of the Inteyior Geol...individual minerals in nodules, ophiolite and alpine peridotite assemblages are available the relations of such...controlled by a minor quantity (-OS”/,) of refractory fluorapatite in mantle residues. In an apatite-bearing lherzolite |  | | Journal (article/letter/editorial) | | Petrology and mineralogy of granulite-facies mafic xenoliths (Sardinia, Italy): Evidence for KCl metasomatism...metagabbronorite xenoliths found in recent alkaline lavas from Western Sardinia, Italy. The xenoliths originated...mol%) + Fe–Ti oxides ± K-feldspar ± biotite ± fluorapatite ± Ti-biotite. Texturally, the K-feldspar occurs...in both K-feldspar-bearing and K-feldspar-free xenoliths. These K-feldspar textures suggest a likely metasomatic...of such fluids is supported by the fluorapatite in these xenoliths, which is enriched in Cl (Cl = 6–50% |  | | Journal (article/letter/editorial) | | material, or both. Amphiboleand apatite-rich xenoliths occur in several alkali-basalt provinces, and...produced by slight partial melting of garnet peridotite, might fractionate as it rises to the range of...Hygromagmatophile element patterns of clinopyroxenite xenoliths indicate that clinopyroxene fractionation could...amphiboleand apatite-rich materials now represented by xenoliths. During generation of later primary magma, apatite-rich...African MARID suite and amphibole and apatite-rich xenoliths from various alkali basalt provinces. Unusual |  | | Journal (article/letter/editorial) | | pressures higher than -22 kbar, near-solidus melts of peridotite + COZ + HZ0 are carbonatitic and may be able...moderate degrees of melting may remain in the source region at very low melt fractions ( 6 1 wt%). Apatite...and the occurrence of apatite in high-pressure xenoliths and megacrysts indicate that apatite is stable...carbonatitic liquids. At pressures 2 22 kbar along the peridotite + CO* + HZ0 solidus, these carbonate-rich liquids...expected in near-solidus melts from dolomite-peridotite (WYLLIE and HUANG, 1976; WALLACEand GREEN, 1988) |  | | Journal (article/letter/editorial) | | peridotites: new contributions from Hyblean peridotite xenoliths (southeastern Sicily) Fabio Carmelo Manuella...peridotites: new contributions from Hyblean peridotite xenoliths (southeastern Sicily), LITHOS (2016), doi:...serpentinization-related hydrothermal IP peridotite xenoliths (southeastern Sicily) T fluids in abyssal...fabiocarmelomanuella@gmail.com AC Keywords: fluid; peridotite; REE; serpentinite; Sr isotopes; sulphide. 1...ABSTRACT We studied a partially serpentinized peridotite xenolith, found in the diatreme tuff-breccia |  | | Journal (article/letter/editorial) | | the mantle wedge from adakitic glass in peridotite xenoliths...........................................from eclogite-facies rocks of the Usagaran belt, Tanzania.................................................microveins and inclusions within spinel peridotite xenoliths, La Gomera, Canary Islands. ..............ILDEFONSE, G. CALAS.– Native Cd+ in sedimentary fluorapatite....................................... 1087 |  | | Journal (article/letter/editorial) | | phlogopite–biotite INTRODUCTION The Kimberley region of northern Western Australia preserves an extended...phlogopite–biotite in associated metasomatized ultramafic xenoliths. An estimate of ascent duration for the Aries...Pidgeon et al., 1989), alkaline magmatism in the region falls into two major episodes: (1) an 800 Ma event...kimberlite–lamproite provinces in the Kimberley region of Western Australia. The outline of the Kimberley...related to Palaeoproterozoic subduction beneath the region (Gunn & Meixner, 1998); however, Griffin et al |  | Song, WenLei, Xu, Cheng, Chakhmouradian, Anton R., Kynicky, Jindrich, Huang, KangJun, Zhang, ZhenLiang (2017) Carbonatites of Tarim (NW China): First evidence of crustal contribution in carbonatites from a large igneous province. Lithos, 282. 1-9 doi:10.1016/j.lithos.2017.02.018 | Journal (article/letter/editorial) | | recycled sediments mixed with the ambient mantle peridotite. The enriched components in the Tarim plume could...ratios of carbonatite lavas in Oldoinyo Lengai, Tanzania, show considerable MA overlap with those for...rhyolitic volcanism (282-277 Ma). The Wajilitage region is located in the northwestern part of the Tarim...dolomite, barite, celestine, pyrite, magnetite, fluorapatite and REE minerals (some of the listed D silicate...aegirine, albite, barite, celestine, pyrite, fluorapatite and REE minerals. Monazite-(Ce) and/or parisite-(Ce) |  | | Report (issue) | | -----------------The bedrock structure of Covey Hill and vicinity, northern New York and southern Quebec...of Tertiary plutons in the Prince William Sound region, Alaska, by M. A. Lanphere____________ 190 195...Stratigraphy The Pennsylvanian and Permian rocks in the region are a thick sequence of dominantly clastic rocks...flank of the fold, but uplift raised the axial region of the anticline high enough to divide the streamflow...the series is much less calcareous than in the region to the northward. The rock lies rather in thin |  | | Journal (article/letter/editorial) | | Gd, Y, Lu, and Pb) have been measured between fluorapatite [Ca5(PO4)3F], chlorapatite [Ca5(PO4)3Cl], and...frequently been reported from metasomatized mantle xenoliths in a number of locations world-wide and, therefore...(chlorapatite), BS23 (hydroxylapatite), BS25 (fluorapatite). We observe only small differences between...experiments. The crystal structure of apatite Fluorapatite [Ca5(PO4)3F)], which is the most-common phosphate...clinopyroxenes (Wood and Blundy 1997; Blundy and Dalton 2000; Hill et al. 2000; Landwehr et al. 2001; Klemme 2001) |  | Guzmics, Tibor, Kodolányi, János, Kovács, István, Szabó, Csaba, Bali, Enikő, Ntaflos, Theodoros (2008) Primary carbonatite melt inclusions in apatite and in K-feldspar of clinopyroxene-rich mantle xenoliths hosted in lamprophyre dikes (Hungary) Mineralogy and Petrology, 94 (3) 225-242 doi:10.1007/s00710-008-0014-5 | Journal (article/letter/editorial) | | and in K-feldspar of clinopyroxene-rich mantle xenoliths hosted in lamprophyre dikes (Hungary) Tibor Guzmics...clinopyroxene–apatite–K-feldspar– phlogopite xenoliths (CAKP), collected from the Late Cretaceous lamprophyre...fraction << 1%) partial melting of either carbonated peridotite ± H2O 226 (e.g., Wyllie and Huang 1976; Eggler...major element compositions of phases in both the xenoliths and melt inclusions, and the bulk composition...genesis and evolution. Geological background Xenoliths were collected from the Late Cretaceous lamprophyre |  | Konzett, Jürgen, Krenn, Kurt, Rubatto, Daniela, Hauzenberger, Christoph, Stalder, Roland (2014) The formation of saline mantle fluids by open-system crystallization of hydrous silicate-rich vein assemblages – Evidence from fluid inclusions and their host phases in MARID xenoliths from the central Kaapvaal Craton, South Africa. Geochimica et Cosmochimica Acta, 147. 1-25 doi:10.1016/j.gca.2014.10.015 | Journal (article/letter/editorial) | | fluid inclusions and their host phases in MARID xenoliths from the central Kaapvaal Craton, South Africa...fluid inclusions and their host phases in MARID xenoliths from the central Kaapvaal Craton, South Africa...fluid inclusions and their host phases in MARID xenoliths from the central Kaapvaal Craton, South Africa...clinopyroxene and zircon from two MARID-type xenoliths (Dawson and Smith, 1977) sampled by Cretaceous... 1983). U-Pb ages of zircons from MARID-type xenoliths sampled by group-I kimberlites, however, show |  | | Journal (article/letter/editorial) | | xenocrysts, mantle vein fragments in xenoliths, as well as wehrlite xenoliths, which are remnants of metasomatized...series from pargasite –Mg-hastingsite in wehrlite xenoliths and xenocrysts to Mg-hastingsite–kaersutite end-members...1170–980 ◦ C) corresponding to the spinel facies of peridotite at different depths (73–21 km) in hydrous (6...metasomatized oceanic lithosphere; wehrlite; mantle xenoliths and xenocrysts; pargasitic amphibole; Ti-amphibole;...rocks (xenoliths kind for minerals from amphibole (Amp)-bearing volcanics and mantle rocks (xenoliths and |  | Zheng, Yong-Fei, Gong, Bing, Li, Yiliang, Wang, Zhengrong, Fu, Bin (2000) Carbon concentrations and isotopic ratios of eclogites from the Dabie and Sulu terranes in China. Chemical Geology, 168 (3) 291-305 doi:10.1016/s0009-2541(00)00199-6 | Journal (article/letter/editorial) | | end-members are hydroxylapatite, chlorapatite, fluorapatite, and carbonate-apatite. OH-, Fand Cl-bearing...Sedimentary apatites are francolite or carbonate fluorapatite, CO 2 in which has the same carbon and oxygen...CO 2 released from basalts and enclosed peridotite xenoliths Že.g., Deines, 1989, 1992.. The stepwise...above 6008C from some basalts and ultramafic xenoliths still shows a large range in d13 C and includes...of Cenozoic alkali basalts and enclosed peridotite xenoliths from East China have a mode distribution |  | | Journal (article/letter/editorial) | | bration of pyroxene in mantle xenoliths. Samplesare (l) garnet peridotite xenoliths from African kimberlites...temperaturesand pressurescalculated for some xenoliths may represent fossil or unrealized conditions...noted that few temperatures calculatedfor mantle xenoliths are below 800 "C and that temperaturescalculated...within the mantle and then quenched on eruption. Xenoliths were selected with calculated temperatures that...geothermometers.One group of samplesconsistsof garnet peridotite xenoliths from kimberlites on the Kaapvaal craton |  | | Journal (article/letter/editorial) | | Mineral-melt-fluid composition of carbonate-bearing cumulate xenoliths in Tertiary alkali basalts of southern Slovakia...cumulate xenoliths occur in alkali basalts of the northern part of the CarpathoPannonian region, Central...xenolith type, is composed of diopside, subordinate fluorapatite, interstitial Fe-Mg carbonates, and accessory...common mantle peridotite nodules, the Tertiary alkali basalts of the Carpatho-Pannonian region of central...central Europe contain xenoliths derived from magmatic reservoirs at various depths. The cogenetic igneous |  | Huraiová, Monika, Paquette, Jean-Louis, Konečný, Patrik, Gannoun, Abdel-Mouhcine, Hurai, Vratislav (2017) Geochemistry, mineralogy, and zircon U–Pb–Hf isotopes in peraluminous A-type granite xenoliths in Pliocene–Pleistocene basalts of northern Pannonian Basin (Slovakia) Contributions to Mineralogy and Petrology, 172 (8) doi:10.1007/s00410-017-1379-4 | Journal (article/letter/editorial) | | U–Pb–Hf isotopes in peraluminous A‑type granite xenoliths in Pliocene–Pleistocene basalts of northern Pannonian...GmbH Germany 2017 Abstract Anorogenic granite xenoliths occur in alkali basalts coeval with the Pliocene–Pleistocene...determined in calcic and calc-alkalic granite xenoliths correspond to a time interval between 5.7 and...Rb-enrichment, contrasting with Ba-enrichment in barren xenoliths. Incipient charnockitization, i.e. orthopyroxene...interstitial silicate melt, was observed in many granite xenoliths. Thermodynamic modeling using pseudosections showed |  | Zhang, Xiaobing, Guo, Feng, Zhang, Bo, Zhao, Liang, Wu, Yangming, Wang, Guoqing, Alemayehu, Melesse (2020) Magmatic evolution and post-crystallization hydrothermal activity in the early Cretaceous Pingtan intrusive complex, SE China: records from apatite geochemistry. Contributions to Mineralogy and Petrology, 175 (4) doi:10.1007/s00410-020-1675-2 | Journal (article/letter/editorial) | | Mesozoic granites and volcanic rocks in the coastal region of SE China (a, after Zhou et al. 2006), and Pingtan...laser ablation system (Resonetics). An X skimmer cone in the interface was utilized to improve the instrumental...those of core (Fig. 4a). Group 2 apatite is fluorapatite. Group 2A and Group 2B apatite have similar...ppm in U abundance. Group 3 apatite is mainly fluorapatite and has CaO of 54.3–57.0 wt% and P2O5 of 41...that observed in Patagonian and Kamchatka mantle xenoliths (Laurora et al. 2001; Patiño Douce et al. 2011) |  | | Journal (article/letter/editorial) | | version received August 21,1980 The solubility of fluorapatite in a wide variety of basic magmatic liquids...mantle P-T conditions (8-25 kbar, 1275-1350°C). Fluorapatite is stable over the entire range of conditions...confidently treated as an incompatible element in peridotite melting models. Such models, in combination with...capsules). Because igneous apatites are dominated by fluorapatite component [16], the only apatite used in the...fluorine is obviously an influential factor in fluorapatite crystallization, so an effort was made to determine |  | | Journal (article/letter/editorial) | | lava flows, and pyroclastic blankets. Incorporating cone sheets, ring dikes, radial dikes, and fenitisation-type...Cax)2–x(CO3)], known from Ol Doinyo Lengai volcano (Tanzania). A refinement to the IUGS chemical classification...low-degree partial melting of carbonated mantle peridotite below 70 km depth (Wyllie and Huang 1976a, 1976b;...natrocarbonatitic lavas from Ol Doinyo Lengai, Tanzania that contain 38–40 wt.% combined Na2O and K2O...Roberts 1984; Zaitsev et al. 2013); Kerimasi, Tanzania (Hay 1983; Zaitsev 2010; Guzmics et al. 2011); |
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