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| submarine and subglacial eruption sites along the Reykjanes Ridge and Iceland, respectively, in order to evaluate...increases from 165 ppm at the southern end of the Reykjanes Ridge to between 620 and 920 ppm beneath Iceland...compositions increases northwards along the Reykjanes Ridge from V61‡N (650 km from the plume centre) towards... Keywords: Iceland; Reykjanes Ridge; subglacial basaltic glasses; volcanic glass; water content 1. Introduction...compared to elsewhere along the northern Mid-Atlantic Ridge. The presence of water lowers the solidus |
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| Ncthcrlands Helium and hydrogen isotopes in ocean-ridge basalts north and south of Iceland R. Poreda...measured in submarine basalt glasses from the Mid-A1lnn1ic Ridge between 52’ and 73’N and in recent volcnnic...length of the Rcykjnnes Ridge (R = 11-16.1 R,) nnd IO 70’N on 1he Kolbcinscy Ridge (R = 10.3-12 R,,). Thcsc...Thcsc IWO ridges urc unique among all mid-ocean ridge segments so for studied in possessing high “He/...ratio ol 16.1 R,., is present ncnr 60’N on the Reykjanes Ridge: norlh of 1his point, 1oward Iceland. lhe ra1io |
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| Late Quaternary sedimentation on the Mid-Atlantic Reykjanes Ridge: clay mineral assemblages and depositional... Abstract Sediment samples from the Mid-Atlantic Reykjanes Ridge (597N) were taken to get information...clay mineral assemblages in sediments of the Reykjanes Ridge reflect paleoceanographic changes during the...concentrations on the western flank of the Reykjanes Ridge indicate the action of bottomwater transport...source was proved by distinct amounts of basaltic glass in the coarse-grained sediment. At approximately |
 | Mertz, Dieter F., Devey, Colin W., Todt, Wolfgang, Stoffers, Peter, Hofmann, Albrecht W. (1991) Sr-Nd-Pb isotope evidence against plume-asthenosphere mixing north of Iceland. Earth and Planetary Science Letters, 107 (2) 243-255 doi:10.1016/0012-821x(91)90074-r | Journal (article/letter/editorial) |
| the mid-Atlantic spreading axis, between the Kolbelnsey Ridge to the north and the Reyklanes Ridge to...south Published geochemical data from the Reykjanes Ridge show evidence for mixing between a MORB component...Iceland plume Available data from the Kolbelnsey Ridge suggest that similar mixing may not be occurring...the Iceland plume and MORB along the Kolbelnsey Ridge, we have collected and analysed samples between...fracture zones (ca 67 °-69 ° N) The 16 Kolbelnsey Ridge samples show limited isotopic variation and are |
 | Peate, David W., Hawkesworth, Chris J., van Calsteren, Peter W., Taylor, Rex N., Murton, Bramley J. (2001) 238U–230Th constraints on mantle upwelling and plume–ridge interaction along the Reykjanes Ridge. Earth and Planetary Science Letters, 187 (3) 259-272 doi:10.1016/s0012-821x(01)00266-7 | Journal (article/letter/editorial) |
| on mantle upwelling and plume^ridge interaction along the Reykjanes Ridge David W. Peate a; *, Chris J...plume-influenced Reykjanes Ridge, and lavas from the Reykjanes Peninsula, Iceland. Southern Reykjanes Ridge samples...U/232 Th) equiline diagram. Within this 150 km ridge section, samples north of the weak segment boundary...sample from the northern, shallow part of the Reykjanes Ridge (61.93³N) also lies within this trend, with...post-glacial lavas on the Reykjanes Peninsula show broadly similar U/Th to the Reykjanes Ridge samples, but at |
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| on June 4, 2015 Depths and temperatures of mid-ocean-ridge magma chambers and the composition of their...submarine basalt glass and coexisting olivine from the Galapagos Rise and the Mid-Atlantic Ridge (60-63~ reveal...crystallized at the liquidus temperature of the host glass. The absence of chemical zoning of olivine indicates...settle out. There, many magmas that erupt at mid-ocean-ridge crests must ascend from their final reservoir...Galapagos Rise and Mid-Atlantic Ridge basalts these reservoirs are at 3-25 km beneath the ridge crust and in |
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| and Reykjanes Ridges, and a small number of basalts from further south on the Mid-Atlantic Ridge. Compared...plume that has incorporated recycled Palaeozoic ocean crust and unradiogenic He, probably from the deep...bulk of the melt to the Kolbeinsey and southern Reykjanes Ridges. However, an additional depleted mantle...mantle source is tapped by the northern Reykjanes Ridge, which with very negative ⌬207Pb and less positive...components is advected southward along the Reykjanes Ridge. Despite strong covariation with isotope ratios |
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| Experimental Investigation of Iceland and Reykjanes Ridge Tholeiites: I. Phase Relations M.R. Fisk*,...Tholeiite basalts from 60~ to 65~ on the Mid-Atlantic Ridge were melted and recrystallized at atmospheric...volcanic zone and the Reykjanes Peninsula of Iceland and nine are from the Reykjanes Ridge. The crystallization...crystallization sequence in both Iceland and Reykjanes Ridge basalts with (Total Fe as FeO)/(Total Fe as FeO+ MgO)...before plagioclase in one Iceland and one Reykjanes Ridge basalt with F / F + M less than 0.57. Chemical |
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| Neodymium and Strontium Isotopic Structure of Ocean Ridge Basalts by R. S. COHEN AND R. K. O'NIONS Department...samples of basaltic glass and altered substrates from spreading centres in the Atlantic, Indian and Pacific...but they are dominated by samples from the Mid-Atlantic Ridge. Whereas basaltic glasses from East Pacific...variability in Pb, Sr and Nd isotope compositions than Atlantic samples, seamount samples from the E. Pacific...similar range of Pb-isotope compositions as Mid-Atlantic Ridge glasses. Contamination of basaltic magmas |
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| variations in the mantle beneath the central North Atlantic Ocean M.D. Kurz and W.J. Jenkins Department of Chemistry...for a set of 35 basaltic glass samples dredged from the Mid-Atlantic Ridge between 28 ° and 53°N latitude...partitioning. The variations in 3He/4He ratio along the ridge therefore must be interpreted to be a result of...o p i c g r a d i e n t s that occur along Mid-Ocean Ridge segments near i s l a n d s [ 5 - 8 ] is m...variations along the Mid-Ocean Ridge. Published values of 3He/4He ratios for MidOcean Ridge basalt (MORB) glasses |
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| Netherlands I61 N e o n isotope variations in Mid-Atlantic Ridge basalts Robert Poreda 1 and Filippo Radicati...basalt glass from the Mid-Atlantic Ridge between 54 ° and 73 ° N. They include the Reykjanes, Kolbeinsey...Kolbeinsey, and M o h n s Ridge segments. Neon isotopic anomalies, relative to the atmospheric ratios, exist...of 7% was measured in two samples from the Reykjanes Ridge. Samples with lower 2°Ne excesses (six samples...samples with 82°Ne between 2 and 4%) from all three ridge segments, appear to result from mixing of a mantle |
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| tholeiites of the Faeroes (Paleocene-Eocene) and the Reykjanes Peninsula, Iceland (Recent) and confirm the Miocene...Miocene renaissance in northeast Atlantic plume activity previously suggested on geophysical grounds....Europe in Mesozoic times subsequently underwent ocean floor spreading in two main stages (Talwani & Eldholm...northwest direction. Spreading rates for the Reykjanes Ridge accelerated from a minimum of 0.7 cm/yr at...subvariolitic or flow banded. Interstitial patches of glass have rarely escaped some alteration. About 15% of |
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| Hydrothermal and Biological Segmentation of Mid-Ocean Ridges Geological Society Special Publications... Hydrothermal and Biological Segmentation of Mid-Ocean Ridges EDITED BY C. J. M A C L E O D University...C., WEST, B. P. & G~LI, L. The Southeast Indian Ridge between 127° and 132°40'E: contrasts in segmentation...accretion 1 BLONDEL, P. Segmentation of the Mid-Atlantic Ridge south of the Azores, based on acoustic classification...evolution of boundary wall faults along the Mid-Atlantic Ridge, 25-29°N 29 ALLERTON, S., SEARLE,R. C. |
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| A low-Li geochemical province in the NE Atlantic J. C. BAILEY & R. GWOZDZ L1THOS Bailey, J. C. & Gwozdz...1978: A low-Li geochemical province in the NE Atlantic. Lithos 11, 73-84. Oslo. ISSN 0024-4937. Lithium...basalts and related igneous rocks from the North Atlantic Tertiary-Recent province using activation analysis...oounting. Monotonous Li values of 5.5+2 ppm in NE Atlantic basalts define a low-Li geochemical province which...the increasing Li 2ontents of ocean-ridge tholeifites into the S Atlantic are believed to monitor Li heterogeneity |
 | Thirlwall, M.F., Gee, M.A.M., Lowry, D., Mattey, D.P., Murton, B.J., Taylor, R.N. (2006) Low δ18O in the Icelandic mantle and its origins: Evidence from Reykjanes Ridge and Icelandic lavas. Geochimica et Cosmochimica Acta, 70 (4) 993-1019 doi:10.1016/j.gca.2005.09.008 | Journal (article/letter/editorial) |
| Icelandic mantle and its origins: Evidence from Reykjanes Ridge and Icelandic lavas M.F. Thirlwall a,*, M.A...and bulk glasses from the Reykjanes Ridge and Iceland. d18O in Reykjanes Ridge olivines shows hyperbolic...to those of moderately enriched lavas on the Reykjanes Peninsula, Iceland. Samples with low d18O show...laterally along the ridge since fissure systems are strongly oblique to the ridge axis. It follows that...that Icelandic mantle advected along the ridge has low d18O. The hyperbolic 143Nd/144Nd–d18O correlation |
 | Wood, D. A., Joron, J. -L., Treuil, M., Norry, M., Tarney, J. (1979) Elemental and Sr isotope variations in basic lavas from Iceland and the surrounding ocean floor. Contributions to Mineralogy and Petrology, 70 (3) 319-339 doi:10.1007/bf00375360 | Journal (article/letter/editorial) |
| in Basic Lavas From Iceland and the Surrounding Ocean Floor The Nature of Mantle Source Inhomogeneities...erupted in the Iceland region of the North Atlantic Ocean. The ocean floor samples are those recovered by legs...occur together within single vertical sections and ocean floor drill holes. Although such variations can...range from 0.7028 in a tholeiite from the Reykjanes Ridge to 0.7034 in an alkali basalt from Iceland...erupted in this part of the North Atlantic Ocean from normal mid-ocean ridge basalt (N-type MORB) - although |
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| in MORB: the contrasting behaviour of the Mid-Atlantic Ridge and East Pacific Rise and implications for...Abstract We have analyzed MORB glasses from the Mid-Atlantic Ridge (64”N-20”s) and the East Pacific Rise (7-21”N)...the high 3He/4He samples, near 61”N on the Reykjanes Ridge (24X 10m2). The depletion factor for chlorine...by the ages of their exospheric reservoirs, the ocean and the continental crust. * Corresponding author...two major steps of geochemical relevance in the ridge environment: magma generation and hydrothermal interaction |
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| representative sample of magmatie helium, much like mid-ocean ridge basalts. The overall variations, high observed...in presenting a subaerial exposure of the Mid-Atlantic Ridge. However, the rift zones of Iceland differ...differ from the adjacent submerged ridge crest in having anomalous elevation, thicker crust, higher heat...source of Icelandic volcanoes and the adjacent mid-ocean ridge volcanism is clearly demonstrated by trace...gradients observed in dredged basalts from the Reykjanes Ridge [1,10,11]. Although the simple binary p l u |
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| Fracture Zone, North Atlantic Ocean E. A. Chernysheva and G. S. Kharin Atlantic Branch of the Shirshov...generated during the initial opening of the North Atlantic (southeastern margin of Greenland and the Vöring...The tectono–magmatic evolution of the Northern Atlantic in the Cenozoic was closely related to the Iceland...opening of the North Atlantic Ocean. The oceanic spreading axis of the Central Atlantic passed through the...develop as late as approximately 60 Ma. The Reykjanes Ridge, which was formed at about 52 Ma, separated |
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| Netherlands GEOCHEMICAL CHARACTERISTICS OF MID-OCEAN RIDGE BASALTS S H E N - S U S U N 1, R O B E R T... Ni, Co, Cr, V) data are presented on ten mid-ocean ridge basalts (MORB), together with a basalt sample...Trench and a basalt from the Tertiary ophiolite complex of eastern Taiwan. Rare earth element (REE) and...o g i cal f e a t u r e s o f m i d - o c e a n ridge basalts ( M O R B ) have 1 Present address: C.S...i o n [9], in w h i c h t h e m i d - o c e a n ridge is s u b d i v i d e d i n t o s e g m e n t s o |
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| (silica-undersaturated). Basalts produced at spreading mid-oceanic ridges have been recognized as being tholeiitic...(i.e., from depths > 1 0 0 kin) and that abyssal ridge basalts were generated by a large degree of partial...z38u/2onpb 30 _ - I 40 50 [ ] THOLEIITES from REYKJANES RIDGE / ~ & JAPANESE BASALTS ~ e OREGON BASALTS •...Tectonic regions Th/U References 1. Mid-oceanic ridges Mid-Atlantic East Pacific 0.9 - 3.3 0.65-2.8 ...clinopyroxene, crystallizing in equilibrium with glass formed by partial melting of the peridotite, has |
 | Poreda, R.J, Craig, H, Arnórsson, S, Welhan, J.A (1992) Helium isotopes in Icelandic geothermal systems: I. 3He, gas chemistry, and 13C relations. Geochimica et Cosmochimica Acta, 56 (12) 4221-4228 doi:10.1016/0016-7037(92)90262-h | Journal (article/letter/editorial) |
| the volcanic rocks erupted on Iceland and the mid-ocean ridges to the north and south has played an irn~~ant...between the mantle plume and the source for Mid-Ocean Ridge basalts. POLAK et al. ( 1976) identified Iceland...south along the Reykjanes Ridge, and - 500 km to the north along the Kolbeinsey Ridge ( POREDA et ai....3He/4He ratio plus the effects of mixing with mid-ocean ridge and Icelandic crustal sources ( CONDOMINES...are the product of complex interaction between a mantle plume, the midocean ridge, and an Icelandic crustal |
 | Moros, M., McManus, J.F., Rasmussen, T., Kuijpers, A., Dokken, T., Snowball, I., Nielsen, T., Jansen, E. (2004) Quartz content and the quartz-to-plagioclase ratio determined by X-ray diffraction: a proxy for ice rafting in the northern North Atlantic?. Earth and Planetary Science Letters, 218 (3) 389-401 doi:10.1016/s0012-821x(03)00675-7 | Journal (article/letter/editorial) |
| a proxy for ice rafting in the northern North Atlantic? M. Moros a; , J.F. McManus b , T. Rasmussen...paleoceanographic reconstructions of the glacial North Atlantic include estimates of iceberg discharge, which...in a study of 12 sediment cores from the North Atlantic. Bulk quartz content and the quartz-to-plagioclase...Elsevier B.V. All rights reserved. Keywords: North Atlantic; quartz; plagioclase; ice rafting; X-ray di¡raction...Moros). The last glacial period in the North Atlantic region was punctuated by enormous iceberg discharge |
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| Science Letters 129 (1995) 31-53 Carbon in Mid-Atlantic Ridge basalt glasses from 28”N to 63”N: Evidence...analyses of CO, in fresh, ‘macrovesicle-free’ Mid-Atlantic Ridge (MAR) basalt glasses from 48 dredge stations...of the MAR profile, along the so-called normal ridge segments, and lowest close to Iceland and over the...percentage fusion along the ridge are proportional to crustal thickness or excess ridge elevation. 1. Introduction...at the mid-ocean ridge spreading centers. Thus, the study of volatiles in fresh mid-ocean ridge basaltic |
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| - Printed m The Netherlands OLIVINE FROM REYKJANES RIDGE AND ICELAND THOLEIITES, AND ITS SIGNIFICANCE...received October 2, 1975 Ohvme crystals from Reykjanes Ridge tholeutes are generally homogeneous and represent...temperatures of ohvlne crystalhzatlon along the Reyklanes Ridge-median Neovolcanlc zone profile show similar V-shaped...fractxonated rocks than the ridge tholentes The major element chemistry of ridge tholentes can be accounted...Geochemical studies of basalts erupted along the Reykjanes Radge and ItS extension over Iceland (median Neovolcanlc |
