 | | Journal (article/letter/editorial) | | The Petrology and Geochemistry of Vesteris Seamount, Greenland Basin—an Intraplate Alkaline Volcano of...typescript accepted 7 May 1993) ABSTRACT Vesteris Seamount is a solitary alkaline volcano in the Greenland...been active in Quaternary times. The lavas from Vesteris studied here consist of basanites, tephrites,...green cores to many clinopyroxene phenocrysts at Vesteris suggest a fractionation history beginning at high...high pressure in the mantle. Differences between Vesteris and Jan Mayen in the ratios of highly incompatible |  | Haase, K. M., Devey, Colin W., Mertz, Dieter F., Stoffers, Peter, Garbe-Schönberg, Dieter (1996) Geochemistry of lavas from Mohns Ridge, Norwegian-Greenland Sea: implications for melting conditions and magma sources near Jan Mayen. Contributions to Mineralogy and Petrology, 123 (3) 223-237 doi:10.1007/s004100050152 | Journal (article/letter/editorial) | | temperature of a “wet” mantle. Mohns MORB (mid ocean ridge basalt) and Jan Mayen area alkali basalts...and a spreading axis in this part of the North Atlantic. Introduction While the geophysical processes...more enriched than “normal” depleted MORB (mid ocean ridge basalt) is still debated and various processes...microlites, variol variolites) Sample no. Olivine Plagioclase Clinopyroxene 23275 23276-1 23288-3 23292-1...Lavas from Mohns Ridge are mainly olivine and plagioclase phyric and in most cases the crystals are smaller |  | | Journal (article/letter/editorial) | | contents of primitive melts of most Pacific and Atlantic intraplate lavas show a regular decrease with...1996 Elsevier Science B.V. All rights reserved Ocean stage and type 90 90 90 90 90 90 90 90 90 90 20...(0.8) (1.2) (0.9) (2.0) Average basal& and mid-ocean Crustal age at eruption (Ma) of orimitive oceanic...(III) Ascension (III) Sao Miguel, Azores (III) Atlantic Ocean 31 31 160 35 1 2 1 2 3 3 3 8 6 1 6 9 5 9 16...Guadelupe (III) Miller Seamount, NE Pacific (III) Welker Guyot, NE Pacific (III) Bowie Seamount, NE Pacific (III) |  | | Journal (article/letter/editorial) | | volcanism associated with the opening of the North Atlantic (Knox and Morton, 1988; Knox, 1998). Equivalents... to confirm the correlation between the North Atlantic and the Tethyan section for these late Palaeocene...1989), and makes fractionation of biotite or plagioclase in the primary source more unlikely. Additionally...similar to that of, e.g., rocks from the Vesteris seamount off East-Greenland Geochemistry of lower...to 20 k.y.), with water temperature in the deep ocean and high-latitude surface water rising by 4° to |  | Santos, Anderson C., Geraldes, Mauro C., Siebel, Wolfgang, Mendes, Julio, Bongiolo, Everton, Santos, Werlem H, Garrido, Thais C. V., Rodrigues, Sergio W. O. (2019) Pleistocene alkaline rocks of Martin Vaz volcano, South Atlantic: low-degree partial melts of a CO2-metasomatized mantle plume. International Geology Review, 61 (3) 296-313 doi:10.1080/00206814.2018.1425921 | Journal (article/letter/editorial) | | Pleistocene alkaline rocks of Martin Vaz volcano, South Atlantic: low-degree partial melts of a CO2metasomatized...Pleistocene alkaline rocks of Martin Vaz volcano, South Atlantic: low-degree partial melts of a CO2metasomatized...Pleistocene alkaline rocks of Martin Vaz volcano, South Atlantic: low-degree partial melts of a CO2-metasomatized...offshore, roughly parallel to ~20° S, through a seamount chain of the Vitoria-Trindade ridge. This paper...extend offshore, roughly parallel ~20° S, through a seamount chain of the Vitoria-Trindade ridge towards two |  | | Journal (article/letter/editorial) | | characterized by marked Nb-anomaly and normal mid-ocean ridge basalt (N-MORB) like HFSE distribution, b)...suite may have represented an oceanic island or seamount formed in an intra-plate setting with or without...number of tectonic settings, including mainly mid-ocean ridges, island arcs, and back-arcs (e.g. Bortolotti...Lithos 132-133 (2012) 113–126 armed Neotethys Ocean is relatively well-documented in west and north...northern Neotethyan ophiolites of the Ankara-Erzincan Ocean. The origin of a number of ophiolitic outcrops |  | Zhang, Zhaochong, Feng, Chengyou, Li, Zhaonai, Li, Shucai, Xin, Ying, Li, Zhaomu, Wang, Xianzheng (2002) Petrochemical study of the Jingpohu Holocene alkali basaltic rocks, northeastern China. GEOCHEMICAL JOURNAL, 36 (2) 133-153 doi:10.2343/geochemj.36.133 | Journal (article/letter/editorial) | | distinct geochemical signatures compared with mid-ocean ridge basalts (MORB), but exhibit many similarities...and augite, with subordinate Ti-magnetite and plagioclase. The phenocrysts are up to 10 mm across and augite...4 mm in diameter. The groundmass consists of plagioclase laths and clinopyroxene grains less than 0.1...and minor leucite. The groundmass consists of plagioclase, clinopyroxene, opaques and olivine, all smaller...either REE plots or mantle-normalized diagrams, plagioclase should not be considered a fractionating phase |  | | Journal (article/letter/editorial) | | are reported from PAP including anorthosite, plagioclase–peridotite and hercynitite among others (Babu...olivine–clinopyroxene (± plagioclase) and olivine–plagioclase set in a groundmass of plagioclase–clinopyroxene–olivine–...of euhedral olivine and plagioclase set in a groundmass composed of plagioclase–clinopyroxene–olivine–biotite–magnetite;...clinopyroxene phenocrysts set in a groundmass of plagioclase–clinopyroxene–magnetite. Note a few grains of...groundmass. Eutectic crystallization of olivine, plagioclase, clinopyroxene and orthopyroxene resulted in |  | Panter, Kurt S, Hart, Stanley R, Kyle, Philip, Blusztanjn, Jerzy, Wilch, Thom (2000) Geochemistry of Late Cenozoic basalts from the Crary Mountains: characterization of mantle sources in Marie Byrd Land, Antarctica. Chemical Geology, 165 (3) 215-241 doi:10.1016/s0009-2541(99)00171-0 | Journal (article/letter/editorial) | | micro-porphyritic containing small percentages of plagioclase, olivine, clinopyroxene and magnetite ŽTable...lithic-rich tuff; B, bomb. Phenocrysts — pl, plagioclase; ol, olivine; cpx, clinopyroxene; amp, amphibole;...coarser grained, holocrystalline, and have higher plagioclase contents relative to the glass-rich pyroclasts...regions. Phenocrysts of olivine, clinopyroxene, plagioclase and magnetite occur in all samples ŽTable 1....of clinopyroxene Ž12%–18%., olivine Ž9%–10%., plagioclase Ž8%–14%. and magnetite Ž1%–2%. to most closely |  | | Journal (article/letter/editorial) | | modeled by fractionation of diopside, olivine, plagioclase, titaniferous magnetite, nepheline and/or apatite...feldspathoid; Cpx, clinopyroxene; Ol, olivine; Plag, plagioclase; Ox, Fe–Ti oxides; Ap, apatite; Amp, alkali-amphibole;...core Ol, olivine; Cpx, clinopyroxene; Plag, plagioclase; Akf, alkali feldspar (anorthoclase); Timt, titanomagnetite...the ‰ notation relative to Vienna Standard Mean Ocean Water (VSMOW; Coplen, 1994). Analyses of quartz...element abundances similar to HIMU (high U/Pb)-type ocean island basalts (OIB). Mt Sidley basanites have lower |  | | Journal (article/letter/editorial) | | Greenland Bulletin 24 Keywords East Greenland, North Atlantic, rifted volcanic margin, large igneous province...Greenland margin and its setting within the North Atlantic region . . . .64 . The coastal flexure and its.... . . . . . . . . . .69 . Mechanisms of North Atlantic rifting . . . . . . . . . . . . . . . . . . ....Greenland Bulletin 24, 96 pp. The Palaeogene North Atlantic Igneous Province is among the largest igneous...(c. 73°N) to Shannon (c. 75°N). In addition, the Ocean Drilling Project penetrated basalt at five sites |  | | Report (issue) | | regions observed or predicted to be extending. Ocean island basalt-like geochemistry is evidence for...erupted ranges from trivial in the case of minor seamount chains to ~108 km3 for the proposed composite...emplacement, which is often poorly known. Although ocean island basalt–type geochemistry is generally agreed...discussed from the Atlantic and Pacific oceans, which show much commonality. Each ocean hosts a single,...volcanism rather than at their beginnings. Each ocean contains several melting anomalies on or near spreading |  | | Book (edition) | | Hochstein and Patrick R. L. Browne 643 Deep Ocean Hydrothermal Vents 857 David A. Butterfield 663...Ignimbrites and Block-and-Ash Flow Deposits Deep Ocean Hydrothermal Vents 857 Impacts of Eruptions on...University of Washington Seattle, Washington, USA Deep Ocean Hydrothermal Vents JON P. DAVIDSON University of...preparing for the first manned exploration of the Mid-Ocean Ridge during Project FAMOUS. This was a critical...main battlefields between the plates: the rifts or ocean ridges and the subduction zones. The most important |
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