 | Koornneef, Janne M., Davies, Gareth R., Döpp, Sonja P., Vukmanovic, Zoja, Nikogosian, Igor K., Mason, Paul R.D. (2009) Nature and timing of multiple metasomatic events in the sub-cratonic lithosphere beneath Labait, Tanzania. Lithos, 112. 896-912 doi:10.1016/j.lithos.2009.04.039 | Journal (article/letter/editorial) | | events in the sub-cratonic lithosphere beneath Labait, Tanzania Janne M. Koornneef a,⁎, Gareth R. Davies a...April 2009 Available online 6 June 2009 Keywords: Tanzania Cratonic lithospheric mantle Xenolith Metasomatism...Sm–Nd systematics of xenoliths from Labait volcano, north-central Tanzania, document multiple metasomatic...Generally, the rift-related metasomatism beneath Tanzania has caused formation of interstitial clinopyroxene...sub-continental lithospheric mantle (SCLM) beneath Tanzania has experienced multiple metasomatic events related |  | | Journal (article/letter/editorial) | | beneath the margin of the rifted Tanzanian craton (Labait) Sonja Aulbach Æ Roberta L. Rudnick Æ William F...peridotite xenoliths from the Quaternary Labait volcano, Tanzania, document the influence of rift-related...data collectively indicate that the plume beneath Labait has HIMU characteristics in Sr, Nd and Li isotope...Rift Plume Cratonic lithospheric mantle Tanzania Introduction Xenolithic peridotites carried in...in rift-related alkali basalts from Tanzania offer a unique opportunity to investigate the effects of |  | | Journal (article/letter/editorial) | | systematic study of mantle xenoliths from the Labait volcano, which lies within the East African Rift on...Tanzanian craton. The Re-Os systematics of the Labait xenoliths show that ancient, refractory lithosphere...range measured for metasomatic xenoliths and the Labait host melilitite (0.13 to 0.14). This range is taken...originally thicker than the ⬃140 km currently beneath Labait, then the lithosphere has been thinned, either...the eastern border of the Tanzanian craton. This region is an ideal place to carry out such a study because |  | | Journal (article/letter/editorial) | | a mantle plume: Insights from the Labait volcano xenoliths (Tanzania) Alain Vaucheza,T, Florence Dineura...The impact of a mantle plume at the base of the Tanzania craton has modified the composition and seismic...the lithospheric mantle. Lavas erupted by the Labait volcano have sampled the perturbed mantle from the...seismic anisotropy over the entire thickness of the Tanzania cratonic lithosphere. Our data thus provide new...preferred orientation; seismic anisotropy; Tanzania; Labait volcano T Corresponding author. Tel.: +33 467 |  | | Journal (article/letter/editorial) | | granulitefacies lower crustal xenoliths from the Labait Volcano on the eastern margin of the Tanzanian Craton...our data imply that the cratonic lithosphere in Tanzania formed ca. ∼ 2.7 Ga, in a convergent margin setting...accessory phases (e.g., apatite, monazite, zircon, rutile) from lower crustal xenoliths of the Kaapvaal Craton...such as monazite, titanite, zircon, apatite and rutile), or, if there is a spread in the Pb isotopic composition...domains: a low 238U/204Pb region retaining common Pb and a higher 238U/204Pb region with more radiogenic Pb |  | | Journal (article/letter/editorial) | | xenolithic peridotite minerals: Examples from Tanzania Sonja Aulbach ⁎, Roberta L. Rudnick Geochemistry...beneath the East African Rift in Tanzania (Lashaine, Olmani, Labait) show systematic differences in their...concentrations (N 2 ppm) and δ7Li (N4‰) in olivine from many Labait and Olmani samples are attributed to an older,...cooling, if the samples were erupted in lavas. In Tanzania, the peridotites experienced rift-related heating...minerals in peridotite xenoliths from the nearby Labait volcano (Aulbach et al., 2008) in order to determine |  | | Journal (article/letter/editorial) | | plumes and the nature of the core–mantle boundary region J. Korenaga . . . . . . . . . . . . . . . . . ...a mantle plume: Insights from the Labait volcano xenoliths (Tanzania) A. Vauchez, F. Dineur and R. Rudnick... . . . . . . . . . . . . . . . . Solubility of rutile in subduction zone fluids, as determined by experiments |  | | Journal (article/letter/editorial) | | Antarctica shows that the upper mantle of this region has been affected by very strong carbonate metasomatism...Cr–Ca–Zr–Nb-bearing armalcolite, zirconolite, Nb–Cr-bearing rutile (e.g., Haggerty 1987, Zaccarini et al. 2004), were...distribution of these minerals at the Labait volcano, Tanzania, in Ti- and Ba-containing metasomatized...supplied by the EMP manufacturer were applied. The region where the mantle xenoliths were collected, Oasis...melting in spinel peridotite xenoliths from Labait, Tanzania. Proc. Sixth Int. Kimberlite Conf. 1, 164-173 |  | | Journal (article/letter/editorial) | | A. Audétat, A. and Keppler, H., Solubility of rutile in subduction zone fluids, as determined by experiments...plumes and the nature of the core–mantle boundary region Korochantseva, E., see Buikin, A. Kossobokov, V...a mantle plume: Insights from the Labait volcano xenoliths (Tanzania) 232 (2005) 95 232 232 232 232 |  | | Journal (article/letter/editorial) | | carbonates in peridotite xenoliths from northeastern Tanzania Received: 30 July 1999 / Accepted: 5 February...xenoliths from the East African Rift in northeastern Tanzania occur as intergranular patches with accessory...MON5p Olivine phenocryst in basalt MON5r Host lava Labait LB58 Eledoi EL14 Carbonates Fig. 1A Interstitial...xenolith suites Carbonates of hydrothermal origin? Labait LB19 Fe-rich dunite Monomineralic interstitial...several xenolith localities in the East African Rift: Labait, Pello, Eledoi, and Monduli volcanoes (see Dawson |  | | Journal (article/letter/editorial) | | revised calibrations for the Ti-in-zircon and Zr-in-rutile thermometers J. M. Ferry Æ E. B. Watson Received:...controlling the Zr content of rutile coexisting with zircon is ZrSiO4 = ZrO2 (in rutile) + SiO2. The equilibrium...Ti substitutes for Si or Zr. The Zr content of rutile thus depends on the activity of SiO2 ðaSiO2 Þ as...confirm the predicted increase in the Zr content of rutile with decreasing aSiO2 ; and unequivocally demonstrate...proportional to ppm Zr in rutile and ppm Ti in zircon, [log(ppm Zr-in-rutile) + logaSiO2 ] = A1 + B1/T(K) |  | | Journal (article/letter/editorial) | | OF DAR ES SALAAM, PO BOX 35052, DAR ES SALAAM, TANZANIA RECEIVED AUGUST 12, 2013; ACCEPTED APRIL 11,...entrained within Quaternary rift basalts in northern Tanzania document the composition, equilibration conditions...beneath the eastern margin of the Tanzanian Craton (Labait) and the adjacent Mozambique Belt (Lashaine and...Menzies et al., 1993; Griffin et al., 1998). In Tanzania, Quaternary basalts are a consequence of active...volcanoes erupted through the crust of northern Tanzania (Jones et al., 1983a; Cohen et al., 1984; Lee |  | Casagli, Alessio, Frezzotti, Maria Luce, Peccerillo, Angelo, Tiepolo, Massimo, De Astis, Gianfilippo (2017) (Garnet)-spinel peridotite xenoliths from Mega (Ethiopia): Evidence for rejuvenation and dynamic thinning of the lithosphere beneath the southern Main Ethiopian Rift. Chemical Geology, 455. 231-248 doi:10.1016/j.chemgeo.2016.11.001 | Journal (article/letter/editorial) | | xenoliths in Quaternary alkali-basalts at Mega (Sidamo region, Ethiopia) provide evidence for refertilization...depression and the Anza Graben, the Kenya Rift, and Tanzania; Fig. 1a), revealed the presence of a chemically...only from the Anza Graben, the Kenya Rift, and Tanzania (Dawson and Smith, 1988; Henjes-Kunst and Altherr...from the southern MER, sampled at Mega (Sidamo region, Ethiopia; MA Fig. 1b), that contain spinel-pyroxene...Quaternary volcanoes at Mega in the Sidamo MA region (Fig. 1b). Here, some pre-existing extensional |  | | Report (chapter) | | have resulted from later regional mapping by the Tanzania Geological Survey, together with radiometric dating...Extrusive basaltic centres. The term ‘peralkaline volcano’ is used here to indicate that the structure is...(unpublished) state that the oldest lavas from this volcano are melanephelinites and melilitites of the Bast...Bast Hills and Birera, to the west of the main volcano. These, as with early lavas from some other centres... 1972) but there is no equivalent in northern Tanzania of the earlier Kenyan flood phonolites, dated |  | | Journal (article/letter/editorial) | | Thomas Crystallization thermometers for zircon and rutile Received: 29 August 2005 / Accepted: 18 January...2006 Springer-Verlag 2006 Abstract Zircon and rutile are common accessory minerals whose essential structural...experiments and analyses of natural zircons and rutile crystals that reveal systematic changes with temperature...temperature in the uptake of Ti in zircon and Zr in rutile. Detailed calibrations of the temperature dependencies...geothermometers—Ti content of zircon and Zr content of rutile—that may find wide application in crustal petrology |  | Ashchepkov, I.V., Vladykin, N.V., Ntaflos, T., Downes, H., Mitchell, R., Smelov, A.P., Alymova, N.V., Kostrovitsky, S.I., Rotman, A. Ya, Smarov, G.P., Makovchuk, I.V., Stegnitsky, Yu.B., Nigmatulina, E.N., Khmelnikova, O.S. (2013) Regularities and mechanism of formation of the mantle lithosphere structure beneath the Siberian Craton in comparison with other cratons. Gondwana Research, 23 (1) 4-24 doi:10.1016/j.gr.2012.03.009 | Journal (article/letter/editorial) | | found for clinopyroxenes from most studied Daldyn region. In Malo-Botuobinsky pipes, the mantle sequences...Udachnaya (Fig. 4) pipe and other pipes in North Daldyn region. They are sub-isobaric and seems to be are sub-horizontal...Karny tuffs from the north east part of the Anabar region (Fig. 8C) contain many low-Ca and low-Cr garnets...2011), The SCLM structure for the Malo-Botuobinsky region is not continuous. The mantle sequence beneath...0.55–0.8 (Ashchepkov et al., 2010b). For Alakit region (in the same Magan terrain) variable compositions |  | Nosova, A. A., Sazonova, L. V., Kargin, A. V., Smirnova, M. D., Lapin, A. V., Shcherbakov, V. D. (2018) Olivine in ultramafic lamprophyres: chemistry, crystallisation, and melt sources of Siberian Pre- and post-trap aillikites. Contributions to Mineralogy and Petrology, 173 (7) doi:10.1007/s00410-018-1480-3 | Journal (article/letter/editorial) | | Chadobets occurrence) ULMs located in the southwestern region of the Siberian craton.. On the basis of a detailed...Siberian craton (Fig. 1). Similar to the central region, the southwestern portion of the Siberian craton...phlogopite, Prv perovskite, Py pyrite, Qz quartz, Rt rutile, Scp scapolite group, Sdl sodalite, Ti-Mag titanomagnetite...edges of Ti-magnetite grains are often corroded by rutile and carbonate. Calcite (up to 2 mm) forms globular...fine grains of apatite, spinel, Ti-magnetite and rutile; and less common high-Ti garnet (Fig. 2). Mela-aillikites |  | | Journal (article/letter/editorial) | | carbonatites have been reported at the surface in the Tok region and no carbonates have been found in Tok xenoliths...peridotites is northern Tanzania, where about 75% of xenolith population at the Labait volcano are reported to...(1997) A view into the subsurface of Mauna Kea volcano, Hawaii: crystallization processes interpreted...HFSE residence and Nb–Ta ratios in metasomatised, rutile-bearing mantle peridotites. Earth Planet Sci Lett...geochemistry of peridotite xenoliths the Labait volcano, Tanzania. In: Gurney JJ, Gurney JL, Pascoe MD et |  | | Journal (article/letter/editorial) | | independently verifying geophysical interpretations of this region of the Earth. Moreover, under favorable circumstances...isochron plot for a suite of mantle xenoliths from Labait volcano, Tanzanian craton (Chesley et al., 1999). Os...Furthermore, unlike stable Archean cratons, this region has high heat flow and has experienced extensive...1203–1216. Davis, W. J., 1997, U-Pb zircon and rutile ages from granulite xenoliths in the Slave Province;...of cratonic rocks in the southern Death Valley region: Evidence for a substantial Archean source component |  | | Journal (article/letter/editorial) | | The Western Branch of the East African Rift is a region with classic occurrences of ultra-potassic magmatism...preferred source for alkaline magmatism in this region (Foley, 1992). Mantle xenoliths from the alkaline...Pello Hill volcano (Dawson and Smith, 1988), Lashaine volcano (Dawson, 2002), Labait volcano (Vauchez et...RI Mantle-derived xenoliths from the Marsabit volcano (Kenya rift) contains graphite in spinel SC peridotites...minerals, mainly titanomagnetite, picroilmenite and rutile (Fig. 5-1-c). Perovskite NU is present in the |  | Ferrando, S., Frezzotti, M. L., Neumann, E.-R., De Astis, G., Peccerillo, A., Dereje, A., Gezahegn, Y., Teklewold, A. (2008) Composition and thermal structure of the lithosphere beneath the Ethiopian plateau: evidence from mantle xenoliths in basanites, Injibara, Lake Tana Province. Mineralogy and Petrology, 93 (1) 47-78 doi:10.1007/s00710-007-0219-z | Journal (article/letter/editorial) | | volumes of flood basalts in the Ethiopia-Yemen region (30–31 Ma; Hoffman et al., 1997; Wolfenden et al...flood basalt province outcrops in the Ethiopian region, west of the rift valley (Fig. 1), and forms a...The NW edge of the plateau (i.e., the Lake Tana region and areas toward Sudan, Fig. 1) represents the...lavas from the plateau were generated from a broad region of upwelling mantle, that was thermally and compositionally...(Cl), periclase (Mg), native chromium (Cr), and rutile (Ti). At these operating conditions, values below |  | Fu, Bin, Page, F. Zeb, Cavosie, Aaron J., Fournelle, John, Kita, Noriko T., Lackey, Jade Star, Wilde, Simon A., Valley, John W. (2008) Ti-in-zircon thermometry: applications and limitations. Contributions to Mineralogy and Petrology, 156 (2) 197-215 doi:10.1007/s00410-008-0281-5 | Journal (article/letter/editorial) | | the substitution: TiO2 þ ZrSiO4 ¼ ZrTiO4 þ SiO2 rutile þ zircon ¼ TiIV zircon þ quartz ð1Þ The resulting...natural zircons in Watson et al. (2006) (but see the Labait harzburgite, Ferry and Watson 2007). While temperatures...respect to rutile would result in temperature estimates that are erroneously low. Since rutile is not reported...Watson 2006). Experimental results indicate that rutile activity in magma is not strongly dependent on...study contain ilmenite or titanite and some contain rutile. In certain cases (e.g., kimberlite megacrysts |  | | Journal (article/letter/editorial) | | a vertical distance of at least 150 km in this region, even during the Palaeoproterozoic. © 2013 Elsevier...Structural interpretation suggests that the Ataa region can be divided into a series of crustal blocks...geological map over the north-eastern Disko Bay region, showing the location of the island Qeqertaa in...average value of about 2500 ppm in the high Mg# region, decreasing to 2000 and then to 1600 ppm at the...Greenlandic garnet-bearing xenoliths (Sarfartoq–Maniitsoq region; Garrit, 2000) and from garnet-free, spinel-bearing |  | | Report (issue) | | 2011006982 Cover: (Top) Mount Meru (4566 m high), Tanzania, from the western side. Courtesy Philippe Nonnotte...(Bottom) Carbonatite lava at Oldoinyo Lengai volcano, northern Tanzania. Courtesy Alexander J. Teague. 10 9...low-velocity anomaly beneath Ethiopia, Kenya, and Tanzania: Constraints on the origin of the African superswell...lithospheric mantle beneath the East African Rift in Tanzania and its potential signatures in rift magmas ....geochemistry of alkaline lava series, Kilimanjaro, Tanzania: New constraints on petrogenetic processes . |  | Puelles, P., Gil Ibarguchi, J.I., García de Madinabeitia, S., Sarrionandia, F., Carracedo-Sánchez, M., Fernández-Armas, S. (2019) Granulite-facies gneisses and meta-igneous xenoliths from the Campo de Calatrava volcanic field (Spain): Implications for the tectonics of the Variscan lower crust. Lithos, 342. 114-134 doi:10.1016/j.lithos.2019.05.031 | Journal (article/letter/editorial) | | of deep-seated xenoliths from the La Encomienda volcano (Neogene Campo de Calatrava Volcanic Field) has...(oligoclase-andesine), quartz, sillimanite, garnet, rutile and biotite conform the mineral assemblage in the...U-Pb zircon and rutile dating The U-Th-Pb isotopic study carried out on zircon and rutile grains was conducted...and 238U masses were acquired both in zircon and rutile. The occurrence of common NU Pb in the samples...previous sample and prepare the next analysis. In rutile grains, small linear sample areas of 115 x 55 µm |
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