 | | 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 |  | 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) | | from Pleistocene–recent volcanism in northern Tanzania J.B. Dawson ⁎ Grant Institute of Geosciences,...canoes in the Gregory Rift Valley of northern Tanzania (termed the Younger Extrusives) comprise one of...volcanism in northern Tanzania The Late Tertiary–Recent volcanic province of northern Tanzania is the most recently...and northern Tanzania. Because of its relatively young age (b~6 Ma), the northern Tanzania province contains...producing basalt and trachyte later), and the oldest volcano in the province, Essimingor — dated at 5.9–5.8 |  | | Journal (article/letter/editorial) | | Antarctica shows that the upper mantle of this region has been affected by very strong carbonate metasomatism...S-bearing chlorapatite, high-Ba, high-Ti phlogopite, calcite, dolomite, Fe-rich magnesite and a mineral of the...contenant du soufre, phlogopite riche en Ba et en Ti, calcite, dolomite, magnésite riche en Fe, et un minéral...distribution of these minerals at the Labait volcano, Tanzania, in Ti- and Ba-containing metasomatized...S-bearing chlorapatite, high-Ba, high-Ti phlogopite, calcite and dolomite. These xenoliths also contain an assemblage |  | | 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...reveals compositional clusters near end member calcite, end member magnesite, and stoichiometric dolomite...carbonatitic lavas (Woolley and Kempe 1989). Crystalline calcite excludes most incompatible trace elements from...MON5r Host lava Labait LB58 Eledoi EL14 Carbonates Fig. 1A Interstitial calcite associated with tiny |  | | 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 |  | | Report (chapter) | | contemporaneous volcanism in southern Kenya and northern Tanzania, the differences taking place abruptly at a latitude...contemporary volcanism in south Kenya and north Tanzania Table 8.1 summarizes the volcanic stratigraphy...northern Tanzania, mainly from c. 8 Ma, i.e. the age of the oldest known activity in northern Tanzania at Essimingor...case of Essimingor, the oldest of the northern Tanzania volcanoes, are similar to the peralkaline volcanoes...basaltic rocks show some resemblances to those in Tanzania (Appendix 2, Dawson 2008) in terms of the dominance |  | | 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....nahcolite, and thaumasite in cavities " " " Calcite and dolomite with magnetite, apatite, phlogopite... 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 |  | | Journal (article/letter/editorial) | | 1994 Quaternary kimberlitic volcanism on the Tanzania Craton J.B. Dawson Department of Geology and Geophysics...magmatic rocks on the Tanzania Craton. They consist of small xenoliths of phlogopite-calcite-garnet lherzolite...lherzolite in an olivine-calcite-dolomite-apatite-perovskite-spinel-serpentine matrix. Their mineralogy, major...strong affinities with kimberlite, particularly the calcite-rich kimberlites of the Benfontein Sills, South...Introduction Quaternary magmatism in northern Tanzania is mainly confined to the immediate vicinity of |  | 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...olivine, clinopyroxene, phlogopite, Ti-magnetite and calcite (Fig. 2). Olivine phenocrysts (0.5–3 mm) occur...grains are often corroded by rutile and carbonate. Calcite (up to 2 mm) forms globular, lenticular, isometric...olivine, phlogopite, Ti-magnetite, perovskite, calcite, apatite, clinopyroxene; the Ilbokich aillikite |  | | 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...melt inclusion containing phlogopite, kalsilite, calcite and clinopyroxene was discovered in olivine phenocryst |  | | Journal (article/letter/editorial) | | kimberlites include olivine (variably serpentinized), calcite, dolomite, phlogopite, monticellite and ilmenite... Although both dolomite and calcite are present in all samples, calcite is typically dominant. The most...textures are observed in the Lynx dyke, where calcite occurs as millimeter scale oikocrysts that enclose...within the matrix (Supplementary Fig. 1H). Both calcite oikocrysts and dolomite rhombs also occur in fresh...kimberlites differ from other kimberlites in the region in having lower iron and titanium than those of |  | 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...products of olivine alteration. In kimberlites, calcite is the principal carbonate mineral present as (micro)phenocrysts...reaction rims and overgrowths on earliercrystallized calcite (Dawson and Hawthorne, 1973; Mel'nik et al., 1982;...samples developed at the expense of serpentine, calcite or any other precursor mineral. The trace-element...Lake (northern Manitoba) hosts coarse-grained calcite carbonatite (sövite) which is mineralogically and |  | | 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 . |  | Xiao, Yan, Zhang, Hong-Fu, Fan, Wei-Ming, Ying, Ji-Feng, Zhang, Jin, Zhao, Xin-Miao, Su, Ben-Xun (2010) Evolution of lithospheric mantle beneath the Tan-Lu fault zone, eastern North China Craton: Evidence from petrology and geochemistry of peridotite xenoliths. Lithos, 117 (1) 229-246 doi:10.1016/j.lithos.2010.02.017 | Journal (article/letter/editorial) | | evolution of the lithospheric mantle beneath this region. These xenoliths commonly have porphyroclastic...Archean cratonic mantle have not been found in this region. Therefore, the abundant cpx-rich lherzolites and...the lithosphere is inferred beneath the Jiaodong region during Phanerozoic times. © 2010 Elsevier B.V....the lithospheric mantle beneath the Tan-Lu fault region, and the processes involved in its evolution. Previously...metamorphic rock in eastern Shandong and the Wudi volcano in northwestern Shandong. Volcanoes in eastern |  | | Journal (article/letter/editorial) | | microphenocrysts, perovskite, zoned chromite, calcite, serpentine, and kinoshitalite mica. They also...(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) | | craton. of metasomatic origin, in particular, calcite (Cal), apatite (Ap), alkali-rich feldspars (Fsp)...wehrlite (d and e), and metasomatic minerals such as calcite (Cal; f), apatite (Ap; f), amphibole (Amp; g) and...metasomatic agent. In this study, the apatite and calcite often occurred in wehrlites. The conversion of...geochemistry of peridotite xenoliths the Labait volcano, Tanzania. In Proceedings of the Seventh International...from Late Cretaceous mafic rocks in the Jiaodong region, east-central China. Int. Geol. Rev. 53, 182–211 |  | Friend, C., Bennett, V., Nutman, A. (2002) Abyssal peridotites >3,800 Ma from southern West Greenland: field relationships, petrography, geochronology, whole-rock and mineral chemistry of dunite and harzburgite inclusions in the Itsaq Gneiss Complex. Contributions to Mineralogy and Petrology, 143 (1) 71-92 doi:10.1007/s00410-001-0332-7 | Journal (article/letter/editorial) | | Archaean Itsaq Gneiss Complex of the Godthåbsfjord region is dominated by 3,850–3,640 Ma tonalite–trondhjemite–granodiorite...1992; Komiya et al. 1999), felsic volcanic and volcano-sedimentary rocks, together with chemical sediments...occasionally small patches and veins of secondary calcite occur (Table 2). Peridotite affinity can be determined...Akilia association (ca. 3,800 m.y.), Ivisartoq region, inner Godthabsfjord, southern West Greenland....late Archaean terrane accretion in the Godthåb region, southern West Greenland. Nature 335:535–538 Friend |  | | Journal (article/letter/editorial) | | portion of the ‘‘plumbing system’’ of a single volcano; it is not uncommon that xenolith suites collected...Cenozoic basalts. b Location map for the Tariat region. Hatched areas are lava flows (mainly in topographic...beneath an area of at least 10 · 20 km in the Tariat region and provides new constraints on major element composition...continued until a few thousand years ago (the Horgo volcano) (Barry et al. 2003; Genshaft et al. 1990; Kepezhinskas...xenoliths in the pyroclastic deposits of the Horgo volcano and lavas along the rivers Narin-Gichigin and Sumein |  | van der Werf, Thomas, Chatzaras, Vasileios, Kriegsman, Leo Marcel, Kronenberg, Andreas, Tikoff, Basil, Drury, Martyn R. (2017) Constraints on the rheology of the lower crust in a strike-slip plate boundary: evidence from the San Quintín xenoliths, Baja California, Mexico. Solid Earth, 8 (6). 1211-1239 doi:10.5194/se-8-1211-2017 | Journal (article/letter/editorial) | | the strike-slip motion to the Gulf of California region led to continental separation of the Baja California...each sample in the 2800– 4000 cm−1 range. This region includes the stretching vibration wave numbers...properties of the mantle lid beneath the Mojave region in southern California, Earth Planet. Sc. Lett...and flow mechanics around porphyroclasts in a calcite marble ultramylonite by means of EBSD analysis...anisotropic structure beneath the Gulf of California region, Phys. Earth Planet. In., 182, 59–72, 2010. Solid |  | Bankole, Shereef, Stow, Dorrik, Smillie, Zeinab, Buckman, Jim, Lever, Helen (2021) Mudrock Microstructure: A Technique for Distinguishing between Deep-Water Fine-Grained Sediments. Minerals, 11 (6) 653 doi:10.3390/min11060653 | Journal (article/letter/editorial) | | contourites and hemipelagites, but still with a region of overlap (Figures 7–9). More significant are...contourites and hemipelagites, but still with a region of overlap (Figures 7–9). More significant are...a mantle plume: Insights from the Labait volcano xenoliths (Tanzania). Earth Planet. Sci. Lett. 2005,...alteration in modern and fossil brachiopod shell calcite: A multi-analytical screening approach (CL, FE-SEM |  | | Book | | Problems of Carbon Recycling. The Guaniamo diamond region, Bolivar state, Venezuela: a new kimberlite province...Upper Mantle Peridotite Xenoliths from Labait, Northcentral Tanzania, and contrasting Metasomatic styles...of Cretaceous Kimberlites from the Paranatinga Region, Central Brazil. 268 Lithosphere Structure and...492 495 Kimberlites and related rocks of Anabar region (Yakutia, Russia). 497 Morphology and Carbon Isotope... N.W. Russia. Kimberlites from the Archangelsk region - A rock type transitional between kimberlites |  | | Journal (article/letter/editorial) | | recharge processes in a coastal aquifer, South-East Tanzania Time-lapse Electrical Resistivity Tomography...recharge processes in a coastal aquifer south-east Tanzania, we analyzed major elements and environmental...Ireland Trace elemental concentrations in stalagmite calcite are a powerful palaeoclimatic tool when used on...interactions with the carbonate bedrock, and by prior calcite precipitation, which result in reduced concentrations...distribution of trace elements observed in stalagmite calcite in previous studies. This current research therefore |  | | Book | | kimberlites on the BHP/DIA MET Claims, Lac de Gras region, Northwest Territories, Canada...................evidence from mantle xenoliths from the Labait volcano, Northern Tanzania...............................124...series of kimberlite bodies from the Daldyn -Alakit region of Western Yakutia.167 Metasomatic reequilibration...alkali basalts from Hamar-Daban, Southern Baikal region, Russia.249 Experimenral investigation on the interaction...kimberlites, melilitites and basalts from the Arkhangelsk region, Russia 342 Epochs and cycles of diamond genesis |  | | Report (issue) | | vectors of the Tibetan Plateau and surrounding region; see Figures 4A and 29A, Chapter 10, “Tectonics:...and Carmichael’s (1964) study of the Thingmuli volcano in Iceland, are typical of the best studies of...core. Whether the partial melting (~10% of source region) to form eucrite liquids was extensive enough to...The differentiated nature of the basalt source region was explained. Indeed the curious Eu depletions...MARS Mars’ Tharsis ridge supports the largest volcano in the solar system: Olympus Mons. Orbital cbservations |
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