	Rudnick, Roberta L., McDonough, William F., Chappell, Bruce W. (1993) Carbonatite metasomatism in the northern Tanzanian mantle: Petrographic and geochemical characteristics. Earth and Planetary Science Letters, 114 (4) 463-475 doi:10.1016/0012-821x(93)90076-l	Journal (article/letter/editorial)
	1992 ABSTRACT Peridotite xenoliths from the Olmani cinder cone, northern Tanzania, possess distinctive...to result from interaction of ultra-refractory peridotite residues with carbonatite melts. Chief among...apatite in refractory harzburgite and wehrlite xenoliths, respectively. (3) LREE enrichment and strong...strong Ti depletion relative to Eu in all but one peridotite. Ca/AI ratios of the clinopyroxene-bearing dunites...illustrate that many LREE-enriched spinel peridotite xenoliths may have been affected by addition of very
	*(2008) Chapter 8 Regional comparisons, petrochemistry and petrogenesis. Geological Society, London, Memoirs, 33. Geological Society of London. 79-89 doi:10.1144/m33.8*	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
	Aulbach, Sonja, Rudnick, Roberta L. (2009) Origins of non-equilibrium lithium isotopic fractionation in xenolithic peridotite minerals: Examples from Tanzania. Chemical Geology, 258 (1) 17-27 doi:10.1016/j.chemgeo.2008.07.015	Journal (article/letter/editorial)
	fractionation in xenolithic peridotite minerals: Examples from Tanzania Sonja Aulbach ⁎, Roberta L. Rudnick...Li redistribution Metasomatism Magma residence Peridotite xenolith a b s t r a c t Olivine, clinopyroxene...orthopyroxene in variably metasomatised peridotite xenoliths from three lithospheric mantle sections...sections beneath the East African Rift in Tanzania (Lashaine, Olmani, Labait) show systematic differences in...diffusion-driven kinetic Li isotope fractionation in mantle xenoliths (1) Li diffusion from grain boundary melt into
	*Dawson, J.B. (2012) Nephelinite–melilitite–carbonatite relationships: Evidence from Pleistocene–recent volcanism in northern Tanzania. Lithos, 152. 3-10 doi:10.1016/j.lithos.2012.01.008*	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...evidence for which is found in Tanzanian mantle xenoliths. An integrated model involves carbonated olivine–nephelinite...asthenosphere by melting of carbonate-bearing peridotite. Small amounts of the melt migrate rapidly and...volcanism in northern Tanzania The Late Tertiary–Recent volcanic province of northern Tanzania is the most recently
	Dawson, J. B., Smith, J. V. (1988) Metasomatised and veined upper-mantle xenoliths from Pello Hill, Tanzania: evidence for anomalously-light mantle beneath the Tanzanian sector of the East African Rift Valley. Contributions to Mineralogy and Petrology, 100 (4) 510-527 doi:10.1007/bf00371380	Journal (article/letter/editorial)
	Metasomatised and veined upper-mantle xenoliths from Pello Hill, Tanzania: evidence for anomalously-light mantle...Abstract. Peridotite xenoliths from the Pello tuff cone in the Rift Valley of northern Tanzania, bear witness...previously depleted peridotite. Chemical and mineralogical gradients are present in the peridotite wall rocks...rocks, and hydrous phases developed in the peridotite are generally lower in Ti and Fe, but higher in Mg and...metasomatism has reduced the density of affected peridotite by up to 4.5%, supporting earlier geophysical
	*Beccaluva, Luigi, Bianchini, Gianluca, Wilson, Marjorie (2011) Volcanism and Evolution of the African Lithosphere. GSA Special Paper* 478. Geological Society of America doi:10.1130/2011.2478**	Report (issue)
	2011006982 Cover: (Top) Mount Meru (4566 m high), Tanzania, from the western side. Courtesy Philippe Nonnotte...Carbonatite lava at Oldoinyo Lengai volcano, northern Tanzania. Courtesy Alexander J. Teague. 10 9 8 7 6 5 4...Africa—New data from lower-crustal and mantle xenoliths from the Bayuda volcanic field, Sudan . . . ....low-velocity anomaly beneath Ethiopia, Kenya, and Tanzania: Constraints on the origin of the African superswell...Ian D. Bastow, Derek Keir, and Eve Daly 5. Peridotite xenoliths from Ethiopia: Inferences about mantle processes
	Burton, K.W., Schiano, P., Birck, J.-L., Allègre, C.J., Rehkämper, M., Halliday, A.N., Dawson, J.B. (2000) The distribution and behaviour of rhenium and osmium amongst mantle minerals and the age of the lithospheric mantle beneath Tanzania. Earth and Planetary Science Letters, 183 (1) 93-106 doi:10.1016/s0012-821x(00)00259-4	Journal (article/letter/editorial)
	and the age of the lithospheric mantle beneath Tanzania K.W. Burton a;b; , P. Schiano a;b , J.-L. Birck...of mantle rock types from xenoliths* in recent volcanics in northern Tanzania. Re and Os abundances for...00013) suggests a minimum age of 3.4 Gyr. Most xenoliths possess Os isotope compositions that are less...isotope ratios; mantle; Mozambique Belt; Tazania; xenoliths; melting; metasomatism; dunite 1. Introduction...isotopic data for coexisting minerals in mantle xenoliths should provide some insight into the behaviour
	Dalton, John A., Wood, Bernard J. (1993) The compositions of primary carbonate melts and their evolution through wallrock reaction in the mantle. Earth and Planetary Science Letters, 119 (4) 511-525 doi:10.1016/0012-821x(93)90059-i	Journal (article/letter/editorial)
	reaction at low pressures transforms the bulk peridotite composition from that of a harzburgite or lherzolite...erupting carbonatite volcano, Oldoinyo Lengai in Tanzania, has an alkali-rich composition dominated by sodium...complex, Malawi [3]) and volcanic (e.g., Kerimasi, Tanzania [4]) settings, and although they do occur in isolation...number of studies of the properties of carbonated peridotite at high pressures. At pressures greater than...kbar, free CO 2 cannot exist in equilibrium with peridotite but reacts with silicates through a series of
	Aulbach, Sonja, Rudnick, Roberta L., McDonough, William F. (2007) Li-Sr-Nd isotope signatures of the plume and cratonic lithospheric mantle beneath the margin of the rifted Tanzanian craton (Labait) Contributions to Mineralogy and Petrology, 155 (1) 79-92 doi:10.1007/s00410-007-0226-4	Journal (article/letter/editorial)
	clinopyroxene from peridotite xenoliths from the Quaternary Labait volcano, Tanzania, document the influence...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...et al. 2000), radiogenic Os isotopes in mantle xenoliths precipitated by rift magmas (Chesley et al. 1999)...unusually light Li in clinopyroxenes from mantle xenoliths from fareast Russia and SW Japan (Nishio et al
	*Bell, Keith, Simonetti, Antonio (2010) Source of parental melts to carbonatites–critical isotopic constraints. Mineralogy and Petrology, 98 (1) 77-89 doi:10.1007/s00710-009-0059-0*	Journal (article/letter/editorial)
	consequence of the phase relationships in the system peridotite-H2O-CO2 (Olafsson and Eggler 1983; Meen et al...current models, in part driven by data derived from xenoliths enclosed in kimberlites. The important features...emerge from the many detailed studies of such xenoliths are that the lithospheric mantle has been subjected...large portion of East Africa that includes Kenya, Tanzania and Uganda. In addition to the linear array shown...criteria used to assess whether carbonates in mantle xenoliths really fall under the definition of carbonatites
	*(2008) Chapter 7 The Neogene-Recent volcanic rocks. Geological Society, London, Memoirs, 33. Geological Society of London. 39-77 doi:10.1144/m33.7*	Report (chapter)
	have resulted from later regional mapping by the Tanzania Geological Survey, together with radiometric dating...half graben, and in the east, lavas from the Kilimanjaro massif filled the depression to the north of...Monduli and the Shira and Mawenzi centres of Kilimanjaro). Some of these basaltic volcanoes, Ngorongoro... 1972) but there is no equivalent in northern Tanzania of the earlier Kenyan flood phonolites, dated...at several centres, such as at the Kibo cone on Kilimanjaro, and at Tarosero, continued into the Pleistocene
	Kuo, Lung -Chuan, Essene, Eric J. (1986) Petrology of spinel harzburgite xenoliths from the Kishb Plateau, Saudi Arabia. Contributions to Mineralogy and Petrology, 93 (3) 335-346 doi:10.1007/bf00389392	Journal (article/letter/editorial)
	Springer-Verlag 1986 Petrology of spinel harzburgite xenoliths from the Kishb Plateau, Saudi Arabia Lung-Chuan...48109, USA Abstract. Two spinel harzburgite xenoliths from a Pleisto- cene alkali basalt unit erupted...associated with neoblasts of olivine, enstatite, and diopside. Sparse exsolution lamellae of high-Ca pyroxene...olivine, whereas zoning of A1 in enstatite and diopside indicates that chemical equilibrium was not attained...contain ultramafic xenoliths. Petrological studies have been made for the xenoliths from the Birk area
	Gibson, S. A., McMahon, S. C., Day, J. A., Dawson, J. B. (2013) Highly Refractory Lithospheric Mantle beneath the Tanzanian Craton: Evidence from Lashaine Pre-metasomatic Garnet-bearing Peridotites. Journal of Petrology, 54 (8) 1503-1546 doi:10.1093/petrology/egt020	Journal (article/letter/editorial)
	previously been identified in global suites of mantle xenoliths or diamond inclusions. They occur in certain harzburgite...xenolith suite from the Lashaine tuff cone, northern Tanzania. The Lashaine ultra-depleted garnets are...refractory mantle is recorded in the Lashaine xenoliths by an almost continuous variation from ultra-depleted...more gradual. KEY WORDS: Archean; metasomatism; peridotite; pyrope garnet; Tanzanian Craton I N T RO D...garnets, found in harzburgite and lherzolite xenoliths from near the eastern margin of the Tanzanian
	*Yaxley, G. M., Green, D. H., Kamenetsky, V. (1998) Carbonatite Metasomatism in the Southeastern Australian Lithosphere. Journal of Petrology, 39 (11) 1917-1930 doi:10.1093/petroj/39.11-12.1917*	Journal (article/letter/editorial)
	carbonate-bearing spinel wehrlite, lherzolite and harzburgite xenoliths from the Newer Volcanics, southeastern Australia...the reaction enstatite + dolomite = forsterite + diopside + CO2 at ~1·5–2·0 GPa, resulting in partial to...direct partial melts of carbonatebearing mantle peridotite (i.e. primary carbonatites; Wyllie & Huang, 1975;...primary carbonatites modified by interactions with peridotite wall-rock in the upper mantle (Wallace & Green...carbonate melts can exist in equilibrium with peridotite over a range of upper-mantle conditions of pressure
	BELL, K., SIMONETTI, A. (1996) Carbonatite Magmatism and Plume Activity: Implications from the Nd, Pb and Sr Isotope Systematics of Oldoinyo Lengai. Journal of Petrology, 37 (6) 1321-1339 doi:10.1093/petrology/37.6.1321	Journal (article/letter/editorial)
	alkaline silicate addition, recent studies of mantle xenoliths and highmagmas with distinct isotopic ratios....secondary other East African carbonatites, and mantle xenoliths, we pro- magmas; and (2) whether the silicate...African Rift Valley (Fig. 1) in northern Tanzania, the 2200 m cone of Oldoinyo Lengai is the youngest of...black dots. S, Shombole; E, Eledoi; L, Lashaine; O, Olmani; P, Pello. Dark grey area, basement; light grey...data from mantle xenoliths from cinder and tuff cones (Eledoi, Lashaine, Olmani, Pello Hill—Cohen et al.
	Lee, Cin-Ty, Rudnick, Roberta L., McDonough, William F., Horn, Ingo (2000) Petrologic and geochemical investigation of carbonates in peridotite xenoliths from northeastern Tanzania. Contributions to Mineralogy and Petrology, 139 (4) 470-484 doi:10.1007/s004100000144	Journal (article/letter/editorial)
	investigation of carbonates in peridotite xenoliths from northeastern Tanzania Received: 30 July 1999 / Accepted:...carbonates in peridotite xenoliths from the East African Rift in northeastern Tanzania occur as intergranular...microprobe analyses of mantle-derived carbonates (in xenoliths, xenocrysts, and megacrysts) reveals compositional...melts. Because most carbonate inclusions in peridotite xenoliths are calcitic, these authors are of the opinion...opinion that most, if not all, carbonates in mantle xenoliths are cumulates. Likewise, Ionov (1998) has argued
	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)
	in the sub-cratonic lithosphere beneath Labait, Tanzania Janne M. Koornneef a,⁎, Gareth R. Davies a, Sonja...April 2009 Available online 6 June 2009 Keywords: Tanzania Cratonic lithospheric mantle Xenolith Metasomatism...and Sm–Nd systematics of xenoliths from Labait volcano, north-central Tanzania, document multiple metasomatic...section of the Tanzanian craton. 1) Garnet and Cr-diopside in two depleted lherzolites record LREE enrichment...equilibrated peridotites contain phlogopite and Cr-diopside inferred to be introduced by a hydrous melt/ﬂuid
	Baudouin, Céline, Parat, Fleurice, Denis, Carole M. M., Mangasini, Fredrik (2016) Nephelinite lavas at early stage of rift initiation (Hanang volcano, North Tanzanian Divergence) Contributions to Mineralogy and Petrology, 171 (7) doi:10.1007/s00410-016-1273-5	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
	Jung, Seung Gi, Choi, Sung Hi, Ji, Kang Hyeun, Ryu, Jong-Sik, Lee, Der-Chuen (2019) Geochemistry of volcanic rocks from Oldoinyo Lengai, Tanzania: Implications for mantle source lithology. Lithos, 350. 105223 doi:10.1016/j.lithos.2019.105223	Journal (article/letter/editorial)
	Geochemistry of volcanic rocks from Oldoinyo Lengai, Tanzania: Implications for mantle source lithology Seung...Geochemistry of volcanic rocks from Oldoinyo Lengai, Tanzania: Implications for mantle source lithology, LITHOS...Geochemistry of volcanic rocks from Oldoinyo Lengai, Tanzania: 2 Implications for mantle source lithology...the East African Rift Valley in 23 northern Tanzania. The volcano is dominated by peralkaline silicate...relative to the compositions of modeled 37 garnet peridotite-derived melts, suggesting that they were derived
	Wilshire, H. G., McGuire, Anne V. (1996) Magmatic infiltration and melting in the lower crust and upper mantle beneath the Cima volcanic field, California. Contributions to Mineralogy and Petrology, 123 (4) 358-374 doi:10.1007/s004100050162	Journal (article/letter/editorial)
	June 1995 y Accepted: 13 December 1995 Abstract Xenoliths of lower crustal and upper mantle rocks from the...and volatile expulsion upon entrainment of the xenoliths. High silica melts ( .¥60% SiO2) may result by...crystallized minerals is common in crustal and mantle xenoliths in volcanic rocks the world over (e.g., Frey and...infiltrating fluid before entrainment of the xenoliths. The infiltrating melts are considered to represent...types unrelated to the host magmas containing the xenoliths, which requires an unrea- 359 sonable juxtaposition
	Lorand, Jean-Pierre, Delpech, Guillaume, Grégoire, Michel, Moine, Bertrand, O'Reilly, Suzanne Y, Cottin, Jean-Yves (2004) Platinum-group elements and the multistage metasomatic history of Kerguelen lithospheric mantle (South Indian Ocean) Chemical Geology, 208 (1) 195-215 doi:10.1016/j.chemgeo.2004.04.012	Journal (article/letter/editorial)
	siderophile trace elements in Kerguelen mantle xenoliths monitor a multistage melt-depletion/ metasomatic...sulfides) metasomatism in some Sierra Nevada mantle xenoliths (South Western USA) which can be accounted for...elements in supercritical aqueous fluids. Mantle xenoliths from the Kerguelen Islands are ideal rocks for...and Se). 2. Petrogenesis of Kerguelen mantle xenoliths The Kerguelen islands (Kerguelen Archipelago;...have provided the greatest diversity of mantle xenoliths ever observed in a within-plate oceanic setting
	*Shaw, Cliff S.J. (2009) Textural development of amphibole during breakdown reactions in a synthetic peridotite. Lithos, 110 (1) 215-228 doi:10.1016/j.lithos.2009.01.002*	Journal (article/letter/editorial)
	amphibole during breakdown reactions in a synthetic peridotite Cliff S.J. Shaw ⁎ Department of Geology, University...Glass Mantle metasomatism Decompression Mantle peridotite Experimental a b s t r a c t Amphibole in metasomatised...amphibole + glass + microlite assemblage in mantle xenoliths is an artefact of heating during transport rather...Introduction The origin of glass in mantle-derived xenoliths has been a contentious issue for more than a decade...have suggested that silicate glass in mantle xenoliths represents the variably modiﬁed quenched remnants
	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)
	(Garnet)-spinel peridotite xenoliths from Mega (Ethiopia): Evidence for rejuvenation...Massimo, De Astis, Gianﬁlippo, (Garnet)-spinel peridotite xenoliths from Mega (Ethiopia): Evidence for rejuvenation...pertain. ACCEPTED MANUSCRIPT (Garnet)-spinel peridotite xenoliths from Mega (Ethiopia): Evidence for rejuvenation...(garnet)-spinel peridotite and pyroxenite xenoliths in Quaternary alkali-basalts at Mega (Sidamo region, Ethiopia)...adiabatic decompression path of about 40 km. Peridotite chemical compositions plot in an off-craton trend
	Kepezhinskas, Pavel, Defant, Marc J., Drummond, Mark S. (1996) Progressive enrichment of island arc mantle by melt-peridotite interaction inferred from Kamchatka xenoliths. Geochimica et Cosmochimica Acta, 60 (7) 1217-1229 doi:10.1016/0016-7037(96)00001-4	Journal (article/letter/editorial)
	of island arc mantle by melt-peridotite inferred from Kamchatka xenoliths PAVEL ’ MARC KEPEZHINSKAS...segment of Kamchatka arc (Russia) host abundant xenoliths of spine1 peridotites and pyroxenites. Textural...through ion microprobe analysis suggest that the xenoliths have interacted with a siliceous (dacitic) melt...completely unlike the host basalt. The suite of xenoliths grade from examples that display little evidence...hot) subducted crust. Island arc metasomatism by peridotite-slab melt interaction is an important mantle
	Jones, A. P., Kostoula, T., Stoppa, F., Woolley, A. R. (2000) Petrography and mineral chemistry of mantle xenoliths in a carbonate-rich melilititic tuff from Mt. Vulture volcano, southern Italy. Mineralogical Magazine, 64 (4) 593-613 doi:10.1180/002646100549634	Journal (article/letter/editorial)
	Petrography and mineral chemistry of mantle xenoliths in a carbonate-rich melilititic tuff from Mt....petrographic and mineralogical data for 21 mantle xenoliths (12 lherzolites, 8 wehrlites and 1 composite)...Formation, Mt. Vulture volcano, southern Italy. The xenoliths are rounded, coarse- to porphyroclastic-textured...chrome-spinel (14 20% MgO, ~30 40% Cr2O3). Many xenoliths contain partial melt glasses and accessory sulphide...garnet (pyrope; Mg84). Secondary veins in several xenoliths contain carbonate with significant Sr levels (~0

Mindat.org is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization.
Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2024, except where stated. Most political location boundaries are © OpenStreetMap contributors. Mindat.org relies on the contributions of thousands of members and supporters. Founded in 2000 by Jolyon Ralph.
Privacy Policy - Terms & Conditions - Contact Us / DMCA issues - Report a bug/vulnerability Current server date and time: April 26, 2024 03:37:13

Go to top of page

Diopside from Peridotite xenoliths, Olmani Cinder Cone (Olmani Hill), Kilimanjaro Region, Tanzania

Diopside from
Peridotite xenoliths, Olmani Cinder Cone (Olmani Hill), Kilimanjaro Region, Tanzania