 | | Journal (article/letter/editorial) | | lavas at early stage of rift initiation (Hanang volcano, North Tanzanian Divergence) Céline Baudouin1 ·...Lengai and Kerimasi volcanoes. Hanang volcano is the southernmost volcano in the North Tanzanian Divergence...the earliest stage of rift initiation. Hanang volcano erupted silica-undersaturated alkaline lavas with...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 |  | | Report (chapter) | | structure of the crust and upper mantle of the Tanzania Craton and the Gregory Rift Valley The past three...Lithosphere Experiment; Yirgu et al. 2006). In northern Tanzania, in 1994, A. A. Nyblade and co-workers established...array of broadband receivers in northern Tanzania, the Tanzania Broadband Seismic Experiment, TBSE (Nyblade...insights into the present-day structure of the Tanzania Craton and the Mozambique belt. Although in many...following section to observations on the northern Tanzania and southern Kenya sectors of the Gregory Rift |  | 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) | | 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 |  | | 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) | | Antarctica shows that the upper mantle of this region has been affected by very strong carbonate metasomatism...distribution of these minerals at the Labait volcano, Tanzania, in Ti- and Ba-containing metasomatized...described harmotome, hydrosilicates rich in Ba, perovskite and high-Ti phlogopite containing up to 1.38...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 |  | Auzende, A.-L., Badro, J., Weber, P., Fallon, S.J., Ryerson, F.J. (2006) Element partitioning at ultra-high pressure: New insights on bulk lower-mantle geochemistry. Geochimica et Cosmochimica Acta, 70 (18) doi:10.1016/j.gca.2006.06.064 | Journal (article/letter/editorial) | | silicate melt-metasomatised xenoliths from the Labait volcano, which show correlations between Li, d7Li and...overall concentrations in the minerals. Magnesian perovskite (Mg,Fe)SiO3 (Mg-pv) and ferropericlase (Mg,Fe)O...304, 855–858. doi:10.1016/j.gca.2006.06.064 Mg-perovskite and |  | | Journal (article/letter/editorial) | | silicate melt-metasomatised xenoliths from the Labait volcano, which show correlations between Li, d7Li and...overall concentrations in the minerals. Magnesian perovskite (Mg,Fe)SiO3 (Mg-pv) and ferropericlase (Mg,Fe)O...304, 855–858. doi:10.1016/j.gca.2006.06.064 Mg-perovskite and |  | | 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) | | 1994 Quaternary kimberlitic volcanism on the Tanzania Craton J.B. Dawson Department of Geology and Geophysics...Hills are the youngest magmatic rocks on the Tanzania Craton. They consist of small xenoliths of ph...lherzolite in an olivine-calcite-dolomite-apatite-perovskite-spinel-serpentine matrix. Their mineralogy, major...Introduction Quaternary magmatism in northern Tanzania is mainly confined to the immediate vicinity of...kimberlite intrusion in the past (Dawson 1970), the Tanzania Craton is virtually devoid of Quaternary igneous |  | | Journal (article/letter/editorial) | | peridotites dredged from the MARK region of the mid-Atlantic Ridge. Fields: MARK region peridotites—black, Kaapvaal...of mantle xenoliths Number Kaapvaal Siberia Tanzania Slave Somerset MORB Cordillera harzburgite...Island, MORB peridotites dredged from the MARK region of the mid-Atlantic ridge, the harzburgite, and...sources as in Fig. 3). dredge hauls from the MARK region (Casey, 1997) of the mid-Atlantic ridge (Al2O3...recognition that cratonic mantle xenoliths from Tanzania (Chesley et al., 1999), Greenland (Bernstein et |  | | Journal (article/letter/editorial) | | clinopyroxene, phlogopite, Crspinel, titanomagnetite, perovskite and carbonates of xenoliths and their host lavas...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 |  | 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...sensitive highresolution ion microprobe analysis of perovskite samples (Chebotarev et al. 2017). Studied samples...Ntr natrolite, Ol olivine, Phl phlogopite, Prv perovskite, Py pyrite, Qz quartz, Rt rutile, Scp scapolite...present are fine laths of phlogopite, abundant perovskite, rare amphibole and clinopyroxene; fine grains |  | | Journal (article/letter/editorial) | | to locate kimberlite dykes on the property. A perovskite U–Pb age of 631.6 ±3.5 Ma has been obtained for...while accessory minerals (‘5% modal) include perovskite, spinel, and apatite, which have previously been...fine-grained matrix of phlogopite, monticellite, spinel, perovskite and apatite. A subset of Renard dyke samples...kimberlites differ from other kimberlites in the region in having lower iron and titanium than those of...may include olivine, monticellite, phlogopite, perovskite, spinel, apatite, carbonate and serpentine. In |  | | Journal (article/letter/editorial) | | East African rift system in Kenya, Uganda, and Tanzania. Although some of these were studied by earlier...area; the Kavirondo ridge; and the Natron-Engaruka region. The rock samples studied were collected by V.... The eroded cinder cone of the gigantic Elgon Volcano is as much as 85 km in diameter and 3.5 km in height...height. The eroded caldera of the Napak Volcano originally ex ceeded 50 km in diameter and 3.5 km in...in height [ 1 2 ] . The Kizingiri Volcano must once have had a cinder cone more than 50 km in diameter |  | | Journal (article/letter/editorial) | | moved from the back-arc to the fore-arc adjacent region, where CO2-rich saline fluid was trapped, by the...trench-parallel direction beneath the hydrated fore-arc region (Jung and Karato 2001; Katayama and Karato 2006)...in peridotite xenoliths obtained from Pinatubo volcano by applying three independent methods: LPO of peridotite...hydration of the mantle wedge beneath Pinatubo volcano. Similar hydration by saline-rich fluid derived...Western and Eastern Volcanic Chains. Pinatubo volcano is located at the Western Volcanic Chain in the |  | Kolesnichenko, Maria V., Zedgenizov, Dmitry A., Litasov, Konstantin D., Safonova, Inna Yu., Ragozin, Alexey L. (2017) Heterogeneous distribution of water in the mantle beneath the central Siberian Craton: Implications from the Udachnaya Kimberlite Pipe. Gondwana Research, 47. 249-266 doi:10.1016/j.gr.2016.09.011 | Journal (article/letter/editorial) | | Ordovician, Late Silurian, 206 Pb/238U zircon and perovskite ages SC R in the Yakutian kimberlite province...kimberlite pipe is located in the Daldyn-Alakit region of the Yakutian kimberlite province and is one...mineralogical, and chemical features. The U-Pb dating of perovskite and Ar-Ar dating of phlogopite from Udachnaya-East...illustrated in Fig. 9. The bands in the 3680-3710 cm-1 region can be assigned to microinclusions of hydrous minerals...amount and wave length of the bands in the hydroxyl region of infrared absorption spectra of mantle olivines |  | Chakhmouradian, A.R., Böhm, C.O., Demény, A., Reguir, E.P., Hegner, E., Creaser, R.A., Halden, N.M., Yang, P. (2009) “Kimberlite” from Wekusko Lake, Manitoba: Actually a diamond-indicator-bearing dolomite carbonatite. Lithos, 112. 347-357 doi:10.1016/j.lithos.2009.03.039 | Journal (article/letter/editorial) | | important implications for diamond exploration in the region. As we shall later show, it also bears on the interpretation...Al-depleted phlogopite, monticellite microphenocrysts, perovskite and Mg-poor ulvöspinelmagnetite compositions...mineralogy of kimberlites from the Arkhangelsk Region, NW Russia: evidence for transitional kimberlite...geochemistry of peridotite xenoliths from the Labait volcano, Tanzania. Proceedings of the VIIth International...in magnetite from the carbonatites of Kerimasi, Tanzania. Canadian Mineralogist 46, 879–900. Reguir, E |  | Doucet, L.S., Ionov, D.A., Golovin, A.V., Pokhilenko, N.P. (2012) Depth, degrees and tectonic settings of mantle melting during craton formation: inferences from major and trace element compositions of spinel harzburgite xenoliths from the Udachnaya kimberlite, central Siberia. Earth and Planetary Science Letters, 359. 206-218 doi:10.1016/j.epsl.2012.10.001 | Journal (article/letter/editorial) | | subduction-zone harzburgite xenoliths from the Avacha volcano in Kamchatka (empty circles: those with opx o 30%...preserved the HREE signatures of their mantle source region. To better assess the effects of contamination...5b and d) (Ionov et al., 2005b, 2005c) and from Tanzania (Lee and Rudnick, 1999). Other factors causing...subduction-zone harzburgite xenoliths from the Avacha volcano in Kamchatka (Ionov, 2010) (fields in (a), open...peridotite xenoliths from the andesitic Avacha volcano, Kamchatka. J. Petrol. 51, 327–361. Ionov, D.A |  | | 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 . |  | Becker, H., Horan, M.F., Walker, R.J., Gao, S., Lorand, J.-P., Rudnick, R.L. (2006) Highly siderophile element composition of the Earth’s primitive upper mantle: Constraints from new data on peridotite massifs and xenoliths. Geochimica et Cosmochimica Acta, 70 (17) 4528-4550 doi:10.1016/j.gca.2006.06.004 | Journal (article/letter/editorial) | | 2001) Archean continental lithospheric mantle Labait, Tanzania Matsoku, Lesotho Lh, Hz (x) Lh, Hz (x) (Chesley...(Arizona, US) UM-10 H San Quintin (Mexico) UM14 L Labait (Tanzania) LB-4 H LB14 H LB 45 L KAT-1 H Matsoku...Pyre 5 nean perid otite 4 s Troodos Lherz. Labait (TZ) Kilbourne H. (USA) Mt. Quincan (AUS) San Carlos...harzburgites from the Kane fracture zone (AP-6), Tanzania (KAT-1), and a depleted lherzolite from Matsoku...trends for some sample suites (Pyrenees, Hannuoba, Tanzania), reflecting long-term Re depletion resulting from |  | Bascou, Jérôme, Doucet, Luc S., Saumet, Sylvaine, Ionov, Dmitri A., Ashchepkov, Igor V., Golovin, Alexander V. (2011) Seismic velocities, anisotropy and deformation in Siberian cratonic mantle: EBSD data on xenoliths from the Udachnaya kimberlite. Earth and Planetary Science Letters, 304 (1) 71-84 doi:10.1016/j.epsl.2011.01.016 | Journal (article/letter/editorial) | | , 1997) UdachnayaEast kimberlite in the Daldyn region of central Siberia limited by major shear zones...randomization of a pre-existing CPO in the finest-grained region in a given rock could correspond to a change in...F., Spetsius, Z.V., 1997. SHRIMP UPb ages of perovskite from Yakutian kimberlites. Russian Geology and...a mantle plume: insights from the Labait volcano xenoliths (Tanzania). Earth and Planetary Science Letters |  | | Journal (article/letter/editorial) | | ultrahigh P garnet peridotites from the Dabie Sulu region form a distinctly low V Fig. 11. Covariation of...and mafic plutonics with basalts from the MARK region of the Mid-Atlantic Ridge. In: Karson, J.A., Cannat...alkali basalts from the Transdanubian volcanic region, west Hungary. J. Petrol. 30, 79 – 105. Ernst,...xenoliths from the Vitim volcanic field, Baikal region: the nature of the garnet – spinel peridotite transition...geochemistry of peridotite xenoliths from the Labait volcano, Tanzania. 7th International Kimberlite Conference |  | | Journal (article/letter/editorial) | | matrix consists of monticellite microphenocrysts, perovskite, zoned chromite, calcite, serpentine, and kinoshitalite...(Griffin et al., 2004), but in the central Slave region the Archean “ultradepleted” layer became underplated...geochemistry of peridotite xenoliths from the Labait Volcano, Tanzania. In: Gurney, J.J., et al. (Ed.), Proceedings...metamorphism in the northern Belomoridian belt, White Sea region: conclusions from U–Pb isotopic data and P–T evidence |  | | Journal (article/letter/editorial) | | (2007) Origin and temporal evolution of Koólau Volcano, Hawaii: inferences from isotope data on the Koólau...peridotite xenoliths from the andesitic Avacha volcano, Kamchatka. J Petrol 51(1–2):327–361. doi: 10....Brakhfogel FF, Spetsius ZV (1997) SHRIMP U-Pb ages of perovskite from Yakutian kimberlites. Geol Geofiz 38(1):91–99...geochemistry of peridotite xenoliths the Labait volcano, Tanzania. In: Gurney JJ, Gurney JL, Pascoe MD,...Late shield-stage silicic magmatism at Wai‘anae volcano: evidence for hydrous crustal melting in Hawaiian |
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