 | | Book | | de Luxembourg With 106 Figures and 95 Tables =e in the text and on 8 Folders 1970 GEBRUDER BORNTRAEGER...character- ized, with scarce an exception, by vulcanism, and the yulcanological evolution, rock suites, geomorphological...intimate acquaintance with all the Atlantic islands, and there is every reason to believe this applies even...southern islands separate, for reasons given above, and no less to furnish a volume of reasonable magnitude...general, shown little interest, and indeed the American J.C. Branner and the Belgian, A. RENARD, are the |  | | Journal (article/letter/editorial) | | a m Geochemistry of Inaccessible Island volcanics R.A. ClifP, P.E. Baker b'~ and N.J. Mateer ~ ~Departmenl...30, 1989; revised and accepted April 8, 1991 ) ABSTRACT Clift; R.A., Baker, P.E. and Mateer, N.J., 1991...Geochemist~' of Inaccessible Island volcanics. ('hem. Geol., 92: 251-260. Inaccessible Island, part of the...the Tristan da Cunha group, is older than Tristan itself but younger than Nightingale. It comprises an...an alkali basalt-trachybasalt-phonolitic trachyte series which is similar to but less alkaline than that |  | | Journal (article/letter/editorial) | | Earth and Planetary Science Letters 462 (2017) 122–131 Contents lists available at ScienceDirect Earth...Earth and Planetary Science Letters www.elsevier.com/locate/epsl Hunting for the Tristan mantle plume...mantle tomography around the volcanic island of Tristan da Cunha Antje Schlömer a,∗ , Wolfram H. Geissler...Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Germany University of Bremen, Germany...mantle hotspot Tristan da Cunha a b s t r a c t The active volcanic island Tristan da Cunha, located at |  | | Journal (article/letter/editorial) | | Earth and Planetary Science Letters, 113 (1992) 343-364 Elsevier Science Publishers B.V., Amsterdam ...spot-plume systems: 1. Distribution of volcanism in time and space J o h n M. O ' C o n n o r a,1 a n d A n t...rocks dredged from seamounts and ridges distributed along the St. Helena and Gough volcanic chains suggests...activity of the St. Helena and Walvis hot spot-plume systems. The St. Helena and Walvis (referred to...to elsewhere as Tristan) hot spots probably consist of broad zones of diffuse volcanism (i.e. oceanic islands |  | | Journal (article/letter/editorial) | | 0022-3530/90 $3.00 Tristan da Cunha, South Atlantic: Geochemistry and Petrogenesis of a Basanite-Phonolite...Lava Series by ANTON P. LE ROEX 1 , R. A. CLIFF 2 AND B. J. I. ADAIR 1 1 Department of Geology, University...University of Leeds, Leeds, UK ABSTRACT The island of Tristan da Cunha, located at 37°S, 12°W in the South Atlantic...islands, the others being Nightingale and Inaccessible. Tristan da Cunha comprises a continuous series of...from ankaramitic basanite through phonotephrite and tephriphonolite to phonolite. Moderately porphyritic |  | Gibson, S.A., Thompson, R.N., Day, J.A., Humphris, S.E., Dickin, A.P. (2005) Melt-generation processes associated with the Tristan mantle plume: Constraints on the origin of EM-1. Earth and Planetary Science Letters, 237 (3) 744-767 doi:10.1016/j.epsl.2005.06.015 | Journal (article/letter/editorial) | | Earth and Planetary Science Letters 237 (2005) 744 – 767 www.elsevier.com/locate/epsl Melt-generation...Melt-generation processes associated with the Tristan mantle plume: Constraints on the origin of EM-1 S.A. Gibson...Road, Durham, DH1 3LE, UK c Department of Geology and Geophysics, Woods Hole Oceanographic Institution...(EM-1) component in ocean–island basalts (OIB, e.g., Kerguelen, Pitcairn and Walvis Ridge) has been attributed...alkali and tholeiitic basalts from the Walvis Ridge and Rio Grande Rise and b3 Ma basanites and basalts |  | Homrighausen, S., Hoernle, K., Hauff, F., Wartho, J.-A., van den Bogaard, P., Garbe-Schönberg, D. (2019) New age and geochemical data from the Walvis Ridge: The temporal and spatial diversity of South Atlantic intraplate volcanism and its possible origin. Geochimica et Cosmochimica Acta, 245. 16-34 doi:10.1016/j.gca.2018.09.002 | Journal (article/letter/editorial) | | Accepted Manuscript New age and geochemical data from the Walvis Ridge: The temporal and spatial diversity of...of South Atlantic intraplate volcanism and its possible origin S. Homrighausen, K. Hoernle, F. Hauff,...GarbeSchönberg, D., New age and geochemical data from the Walvis Ridge: The temporal and spatial diversity of...of South Atlantic intraplate volcanism and its possible origin, Geochimica et Cosmochimica Acta (2018)...manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published |  | | Journal (article/letter/editorial) | | Available online at www.sciencedirect.com Earth and Planetary Science Letters 265 (2008) 475 – 486 www...elsevier.com/locate/epsl Ce anomalies in Gough Island lavas — Trace element characteristics of a recycled...spectrometry and Sr–Nd isotope analyses are presented for mafic volcanic rocks from Gough Island, South Atlantic...argued that the negative Ce anomalies in Gough Island lavas are consistent with variable amounts of a...with negative Ce anomaly and mantle capable of giving rise to Gough Island magmas without Ce anomalies |  | | Journal (article/letter/editorial) | | com/locate/chemgeo Os isotope systematics in Fogo Island: Evidence for lower continental crust fragments...15 February 2005 Abstract Os and Nd isotopic ratios as well as major and trace element compositions have...Fogo Island, Cape Verde. These new data complement a previous archipelago-scale study (Southern and Northern...2003. Pb-Sr-He isotope and trace element geochemistry of the Cape Verde Archipelago. Geochim. Cosmochim...3717-3733], in which major, trace element contents and Sr–Pb–He isotopic compositions of lavas were determined |  | | Journal (article/letter/editorial) | | Geochronology of the Tristan da Cunha Group of Islands By I. G. GASS ABSTRACT A geological synopsis...islands of the Tristan da Cunha group is given and their rate of growth by volcanic processes, and their subsequent...These data, though few as yet, suggest that each island has a " life cycle " consisting of a brief constructional...scale of geological time is widely accepted (Menard and Ladd, 1963); however, in only a few cases has it...Upton, and Wadsworth, 1965; Fitch, Grasty, and Miller, 1965). In this regard, the Tristan da Cunha group |  | | Journal (article/letter/editorial) | | 87 Potassium-argon ages from Tristan da Cunha, South Atlantic IAN MCDOUGALL & C. D. OLLIER Summary.... mainly lavas, from Tristan da Cunha range from 0.21+0.01 to 0.01 ±0.02 Ma, and confirm the youthfulness...the Mid Atlantic Ridge. 1. Introduction The Tristan da Cunha group of volcanic islands is situated about...at longitude 12° 17' W, latitude 37° 05' S. The island group lies near the southwestern extremity of the...Ridge where it merges with the Mid Atlantic Ridge, and is built upon oceanic crust of age approximately |  | | Journal (article/letter/editorial) | | EPSL ELSEVIER Earth and Planetary Science Letters 141 (1996) 277-291 Isotope characteristics of the...constraints on the composition of the early Tristan plume and the origin of the EM 1 mantle component Simon...Rondebosch 7700, South Africa b Ministry of Mines and Energy, Geological Survey. P.O. Box 2168. Windhoek...August 1995; accepted 22 March 1996 Abstract Sr, Nd and Pb isotope data are presented for a variety of intrusive...age Okenyenya igneous complex, which is temporally and spatially associated with the Etendeka Group volcanic |  | Peate, D. W., Hawkesworth, C. J., Mantovani, M. M. S., Rogers, N. W., Turner, S. P. (1999) Petrogenesis and Stratigraphy of the High-Ti/Y Urubici Magma Type in the Parana Flood Basalt Province and Implications for the Nature of 'Dupal'-Type Mantle in the South Atlantic Region. Journal of Petrology, 40 (3) 451-473 doi:10.1093/petroj/40.3.451 | Journal (article/letter/editorial) | | Petrogenesis and Stratigraphy of the HighTi/Y Urubici Magma Type in the Paraná Flood Basalt Province and Implications...HAWKESWORTH2, MARTA M. S. MANTOVANI3, NICK W. ROGERS2 AND SIMON P. TURNER2 1 DANISH LITHOSPHERE CENTRE, ØSTER...considered as a single entity: Urubici flood basalts and Walvis Ridge Site 525A basalts have a relatively...within originally lithospheric mantle, whereas the Tristan plume is a deep mantle upwelling. The high-Ti/Y...spatial extent, near the southeast Brazilian coast and in the northern Etendeka (Namibia). Urubici flows |  | | Journal (article/letter/editorial) | | 2089^2120 2010 doi:10.1093/petrology/egq050 Shona and Discovery Aseismic Ridge Systems, South Atlantic:...ANTON LE ROEX1*, CORNELIA CLASS2, JOHN O’CONNOR3 AND WILFRIED JOKAT4 1 DEPARTMENT OF GEOLOGICAL SCIENCES...Ridge^Meteor Rise^Agulhas Ridge^Cape Rise seamounts) and the Discovery Rise to the north have been argued...to represent the surface expressions of the Shona and Discovery mantle plumes, based on enriched samples...Mid-Atlantic Ridge, a single sample from Discovery Rise and tectonic reconstructions. Leg PS69 ANT XXIII/5 of |  | | Journal (article/letter/editorial) | | EPSL ELSEVIER Earth and Planetary Science Letters 144 (1996) 75-92 The relationship between the age...lithosphere and the composition of oceanic magmas: Constraints on partial melting, mantle sources and the thermal...basis of different proportions and chemical compositions of shield and post-shield magmas, three types...SiO, contents of primitive melts of most Pacific and Atlantic intraplate lavas show a regular decrease...average ratios of (Ce/Yb)N(=,hondrite_norma,,zed) and (Tb/Yb), with increasing age of the lithosphere imply |  | Homrighausen, S., Hoernle, K., Geldmacher, J., Wartho, J.-A., Hauff, F., Portnyagin, M., Werner, R., van den Bogaard, P., Garbe-Schönberg, D. (2018) Unexpected HIMU-type late-stage volcanism on the Walvis Ridge. Earth and Planetary Science Letters, 492. 251-263 doi:10.1016/j.epsl.2018.03.049 | Journal (article/letter/editorial) | | Earth and Planetary Science Letters 492 (2018) 251–263 Contents lists available at ScienceDirect Earth...Earth and Planetary Science Letters www.elsevier.com/locate/epsl Unexpected HIMU-type late-stage volcanism...Germany V.I. Vernadsky Institute of Geochemistry and Analytical Chemistry, Kosygin St. 19, 119991 Moscow...Walvis Ridge late-stage volcanism trace elements and isotope geochemistry 40 Ar/39 Ar dating high 238...Volcanic activity at many oceanic volcanoes, ridges and plateaus often reawakens after hiatuses of up to |  | | Journal (article/letter/editorial) | | Earth and Planetary Science Letters, 116 (1993) 81-99 81 Elsevier Science Publishers B.V., Amsterdam...Geochemistry of the Pitcairn seamounts, I: source character and temporal trends Jon D. W o o d h e a d a a n d C...the central Pacific Ocean, southeast of Pitcairn Island, has revealed a number of large volcanic edifices...currently active. Here we document the first isotope and trace element data obtained for dredge samples from...of these lavas with end-members of extreme EM-I and isotopically more depleted type. Isotope-trace element |  | | Journal (article/letter/editorial) | | Low-Ti magma types (Gramado and Esmeralda) are distinguished within the flood basalt sequences of southern...abundances and ratios. Esmeralda magmas have lower Ce/Sm and ( 87Sr/X”Sr) i, and higher Ti/Zr and ?? Nd,than...contamination of an asthenosphere-derived melt with time, and instead it seems that the two magma types evolved...Gramado magmas are dominated by crustal assimilation and fractional crystallisation, geochemical features...magmas [low Ti/Y of < 300 and low Nb/La of <0.8, negative +,-values - - 3 and high (87Sr/8”Sr), 0.708-0 |  | | Book (volume) | | THE OCEAN BASINS AND MARGINS Volume | The South Atlantic THE OCEAN BASINS AND MARGINS Volume 1:...The North Atlantic Volume 3: The Gulf of Mexico and the Caribbean Volume 4: The Mediterranean Volume...Ocean ‘THE OCEAN BASINS AND MARGINS, A. Edited by-AlanjE. M. Nairn and Francis G. Stehli Department...de Geociéncias e Astronomia and Centro de Pesquisas Geocronolégicas da Universidade de Sao Paulo, Brazil...Instituto de Geociéncias e Astronomia and Centro de Pesquisas Geocronolégicas da Universidade de Sao Paulo, Brazil |  | Comin-Chiaramonit, P., Cundari, A., Piccirillo, E.M., Gomes, C.B., Castorina, F., Censi, P., De Min, A., Marzoli, A., Speziale, S., Velazquez, V.F. (1997) Potassic and Sodic Igneous Rocks from Eastern Paraguay: their Origin from the Lithospheric Mantle and Genetic Relationships with the Associated Parana flood tholeiites. Journal of Petrology, 38 (4) 495-528 doi:10.1093/petroj/38.4.495 | Journal (article/letter/editorial) | | Potassic and Sodic Igneous Rocks from Eastern Paraguay: their Origin from the Lithospheric Mantle and Genetic...P. CENSI6, A. DE MIN3, A. MARZOLI3, S. SPEZIALE6 AND V. F. VELÁZQUEZ4 1 DIPARTIMENTO DI INGEGNERIA CHIMICA...Triassic sodic intrusions and lavas; (2) Early Cretaceous potassic igneous rocks and very scarce sodic lavas;...eastern Paraguay: (1) widespread potassic magmatism and SGF tholeiites (Early Cretaceous); (2) Asunción...proposed, i.e. basanite to phonolite and alkali basalt to trachyte and their intrusive analogues. The sodic |  | | Journal (article/letter/editorial) | | Earth and Planetary Science Letters 305 (2011) 92–102 Contents lists available at ScienceDirect Earth...Earth and Planetary Science Letters j o u r n a l h o m e p a g e : w w w. e l s ev i e r. c o m / l o...e p s l South Atlantic DUPAL anomaly — Dynamic and compositional evidence against a recent shallow origin...volcanism associated with the Tristan– Gough, Discovery and Shona plumes, and along adjacent sections of...of the southern Mid-Atlantic Ridge, and has been variably attributed to either shallow continental or deep |  | | Journal (article/letter/editorial) | | Author(s): Dr. Macklin, Commander Worsley, H. R. Mill and Mr. Rowett Source: The Geographical Journal, Vol...that helps scholars, researchers, and students discover, use, and build upon a wide range of content... We use information technology and tools to increase productivity and facilitate new forms of scholarship...are collaborating with JSTOR to digitize, preserve and extend access to The Geographical Journal This content...resistant and stand up prominently, their cross-columnar structure being a special feature. The island is covered |  | | Journal (article/letter/editorial) | | 1998 Isotope and Trace Element Geochemistry of Cretaceous Damaraland Lamprophyres and Carbonatites,...Plume–Lithosphere Interactions ANTON P. LE ROEX∗ AND RUTH LANYON† DEPARTMENT OF GEOLOGICAL SCIENCES, UNIVERSITY...ACCEPTED DECEMBER 12, 1997 Major and trace element and radiogenic and stable isotope data are reported...reported for Cretaceous lamprophyres and carbonatites associated with alkaline igneous complexes in Damaraland...emplaced as late-stage dykes, stocks and diatremes, include both alkaline and ultramafic varieties. Many of |  | Doucelance, Régis, Escrig, Stéphane, Moreira, Manuel, Gariépy, Clément, Kurz, Mark D. (2003) Pb-Sr-He isotope and trace element geochemistry of the Cape Verde Archipelago. Geochimica et Cosmochimica Acta, 67 (19) 3717-3733 doi:10.1016/s0016-7037(03)00161-3 | Journal (article/letter/editorial) | | 3 Pb-Sr-He isotope and trace element geochemistry of the Cape Verde Archipelago RÉGIS DOUCELANCE,1...ESCRIG,1 MANUEL MOREIRA,3,† CLÉMENT GARIÉPY,2 and MARK D. KURZ3 1 Laboratoire de Géochimie et Cosmochimie...H3C 3P8, Canada 3 Department of Marine Chemistry and Geochemistry, Woods Hole Oceanographic Institution...February 17, 2003) Abstract—New lead, strontium and helium isotopic data, together with trace element...basalts from the Cape Verde archipelago (Central Atlantic). Isotopic and chemical variations are observed |  | | Book | | Natural Environment Series Editors: Andrew Goudie and Heather Viles This new Blackwell series aims to...of the physical and natural environment of the earth in the past and in the present, and of the processes...Process and Management K.]. Gregory and D.E. Walling Land Degradation Laurence A. Lewis and Douglas...Ecosystems Edward Maltby Arctic and Alpine Geomorphology Lewis A. Owen, DavidJ.Evans and Jim Hansom Humid Tropical...Reading, Andrew Millington and Russell Thompson Weathering W.B. Whalley, B.]. Smith and J.P. McGreevy Oceanic |
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