 | Vallier, T.L., Jenner, G.A., Frey, F.A., Gill, J.B., Davis, A.S., Volpe, A.M., Hawkins, J.W., Morris, J.D., Cawood, P.A., Morton, J.L., Scholl, D.W., Rautenschlein, M., White, W.M., Williams, R.W., Stevenson, A.J., White, L.D. (1991) Subalkaline andesite from Valu Fa Ridge, a back-arc spreading center in southern Lau Basin: petrogenesis, comparative chemistry, and tectonic implications. Chemical Geology, 91 (3) 227-256 doi:10.1016/0009-2541(91)90002-9 | Journal (article/letter/editorial) | | Subalkaline andesite from Valu Fa Ridge, a back-arc spreading center in southern Lau Basin: petrogenesis, comparative...Subalkaline andesite from Valu Fa Ridge, a back-arc spreading center in southern Lau Basin: petrogenesis, comparative...two sites on Valu Fa Ridge (VFR), a back-arc spreading center in Lau Basin. Valu Fa Ridge, at least 200...discontinuouslyfor about 100 km along the ridge axis, lie 3-4 km beneath the ridge. The mostly aphyric and glassy...the VFR lavas have both volcanic arc and back-arc basin affinities. The volcanic arc characteristics are: |  | | Journal (article/letter/editorial) | | formation of silicic Kermadec island arc and HavreāLau backarc magmas by fractional crystallisation K.M...relative contributions from hydrothermally altered basalt and sedimentary material. Andesitic to rhyolitic...island arc volcanoes and basalts to dacites from the Lau and Havre backarc rifts yield Ī“18O between 5.4 and...contributions of hydrous ļ¬uids from subducted altered basalt/serpentinite with little sediments. Ā© 2011 Elsevier...et al., 2009). Similarly, many volcanoes in the TongaāKermadec island arc erupt dacitic to rhyolitic lavas |  | | Report (issue) | | GLASS COMPOSITIONS FROM TWO SPREADING CENTERS IN LAU BASIN, SOUTH PACIFIC OCEAN by Alicd S. Davis, David...rocks ranging from basalt to andesite in composition were dredged from Lau Basin. Samples labeled L3-84-SP...Lee from two sites on Valu Fa Ridge, a spreading center in the southern Lau Basin. Samples designated SO35-2...24 sites in Lau Basin. Fifteen of these dredges were also located on, or near, Valu Fa Ridge, and ten dredges...were located on a spreading center north of Valu Fa Ridge. Location of the two areas studied are shown |  | PEATE, DAVID W., KOKFELT, THOMAS F., HAWKESWORTH, CHRIS J., VAN CALSTEREN, PETER W., HERGT, JANET M., PEARCE, JULIAN A. (2001) U-series Isotope Data on Lau Basin Glasses: the Role of Subduction-related Fluids during Melt Generation in Back-arc Basins. Journal of Petrology, 42 (8) 1449-1470 doi:10.1093/petrology/42.8.1449 | Journal (article/letter/editorial) | | PAGES 1449ā1470 2001 U-series Isotope Data on Lau Basin Glasses: the Role of Subduction-related Fluids...from active spreading centres in the back-arc Lau Basin (SW Pacific), together with additional inductively...element analyses and SrāNdāPb isotope data. Valu Fa Ridge samples, adjacent to the arc front, have high...fluid. The Valu Fa data can be combined with existing 230 Thā238U data for the Central Tonga arc to infer...transfer beneath the Valu Fa Ridge and beneath the arc itself suggest that the Valu Fa Ridge is propagating |  | Haase, Karsten M., Fretzdorff, Susanne, MĆ¼he, Richard, Garbe-Schƶnberg, D., Stoffers, Peter (2009) A geochemical study of off-axis seamount lavas at the Valu Fa Ridge: Constraints on magma genesis and slab contributions in the southern Tonga subduction zone. Lithos, 112 (1) 137-148 doi:10.1016/j.lithos.2009.05.041 | Journal (article/letter/editorial) | | at the Valu Fa Ridge: Constraints on magma genesis and slab contributions in the southern Tonga subduction...of the Valu Fa Ridge and from seamounts south of the propagating rift tip of the Valu Fa Ridge. Most seamount...andesitic to dacitic lavas from the adjacent Valu Fa Ridge. Slight differences in ļ¬uid-mobile element ratios...island arc magmas. Off-axis volcanoes near back-arc basin spreading centres thus resemble off-axis seamounts...compositions than the well-homogenized mid-ocean ridge basalts. The geochemical variations support a diapiric |  | | Journal (article/letter/editorial) | | central Lau Basin and Valu Fa Ridge: Evidence of crust/mantle interactions in a back-arc basin D. R. HILTON...analyses of fresh Lau Basin volcanic glasses from six sites within the central basin ( - 18āS), six localities...localities along the Valu Fa Ridge (2 lo-22.45)) and a single site from the northeastern basin ( - 1SOS). Central...Central basin basalts have 3He/4He ratios (R) between 8.2-8.5 RA ( RA = air 3He/4He), 40Ar/MAr ratios significantly...region. In contrast, evolved lavas from the Valu Fa Ridge all have R/R,, < MORB and show evidence of mixing |  | | Journal (article/letter/editorial) | | Ž1998. 177ā194 Oxygen isotope variations in Lau Basin lavas Colin G. Macpherson ) , David P. Mattey...volcanic glasses and phenocrysts from Lau and North Fiji Basin lavas. The low oxygen blank of the technique...propagating and dying rift tips in the Central Lau Basin display significant 18 O-enrichment with magmatic...isotope geochemistry and petrology of Central Lau Basin lavas constrain magmatic evolution to depths between...seafloor. A dacite from Valu Fa Ridge is slightly 18 O-enriched relative to Valu Fa basalts, consistent with |  | | Journal (article/letter/editorial) | | noble gases in volcanic glasses from the southern Lau Basin: origin from the subducting slab? Wolfgang...submarine volcanic glasses from the Valu Fa Ridge (VFR) in the southern Lau Basin. The samples are the least differentiated...published data from the Valu Fa Ridge and other spreading segments in the Lau Basin, our data show a systematic...gases; basalts; subduction zones; back-arc basins; Lau Basin 1. Introduction Old oceanic crust which is returned...in most back-arc basin basalts is slightly more radiogenic than in mid-ocean ridge basalts (MORB) has |  | | Report (chapter) | | Publications Geochemistry of Lau Basin volcanic rocks: influence of ridge segmentation and arc proximity...July 14, 2014 Geochemistry of Lau Basin volcanic rocks: influence of ridge segmentation and arc proximity...sonar imaging of the Central Lau Basin (SW Pacific) has revealed a Central Lau Spreading Centre (CLSC) propagating...expense of an Eastern Lau Spreading Centre (ELSC) with a small Intermediate Lau Spreading Centre (ILSC)...provide further evidence that, beneath the Central Lau Basin, the source composition changes progressively |  | Kendrick, Mark A., Arculus, Richard J., Danyushevsky, Leonid V., Kamenetsky, Vadim S., Woodhead, Jon D., Honda, Masahiko (2014) Subduction-related halogens (Cl, Br and I) and H2O in magmatic glasses from Southwest Pacific Backarc Basins. Earth and Planetary Science Letters, 400. 165-176 doi:10.1016/j.epsl.2014.05.021 | Journal (article/letter/editorial) | | halogens chlorine water subduction mantle backarc basin basalts a b s t r a c t Submarine magmatic glasses...and Lau backarc basins in the Southwest Paciļ¬c, and Volcano A on the volcanic front of the Tonga Arc...Arc adjacent to the Lau Basin, were investigated to characterise the Cl, Br and I elemental budgets in subduction...variability in the Br/Cl and I/Cl ratios of backarc basin basalts (BABB) and evaluate if these ratios could...glasses represent variably evolved melts of boninite, basalt, basaltic-andesite, dacite and rhyolite composition |  | | Journal (article/letter/editorial) | | of Re enrichment in arc magmas: evidence from Lau Basin basaltic glasses and primitive melt inclusions...olivine-hosted melt inclusions from the Valu Fa Ridge, the south tip of the Lau Basin, in the southwestern Pacific...the Lau Basin basaltic glasses changes systematically from compositions similar to MORB in the Lau Spreading...compositions in the Valu Fa Ridge, providing geochemical profiles both along the Lau Spreading Centers...(ridges) and across the Valu Fa Ridge. The east seamount samples of the Valu Fa Ridge have diagnostic trace |  | | Journal (article/letter/editorial) | | beneath the back-arc spreading centers along the Lau Basin Nicholas Harmon a,ā, Donna K. Blackman b a b ...August 2010 Accepted 4 August 2010 Keywords: Lau Basin Tonga subduction zone back-arc spreading mantle melting...back-arc spreading centers that extend along the Lau Basin exhibit trends in axial morphology, crustal thickness...of the Lau back-arcāTonga subduction system for each of three Lau spreading centersāValu Fa Ridge, the...the Eastern Lau, and the Central Lau. Our goal is to determine whether along-strike variability in the circulation |  | Kamenetsky, Vadim S., Crawford, Anthony J., Eggins, Stephen, MĆ¼he, Richard (1997) Phenocryst and melt inclusion chemistry of near-axis seamounts, Valu Fa Ridge, Lau Basin: insight into mantle wedge melting and the addition of subduction components. Earth and Planetary Science Letters, 151 (3) 205-223 doi:10.1016/s0012-821x(97)81849-3 | Journal (article/letter/editorial) | | inclusion chemistry of near-axis seamoonts, Valu Fa Ridge, Lau Basin: insight into mantle wedge melting and...erupted at near-axis seamounts on either side of Valu Fa Ridge provide a hitherto unprecedented insight into...complexity of magma generation in this back-arc basin tectonic setting. Two fundamentally different primitive...high-CaO (- 14 wt%), low-AlzO, (- 8 wt%) magnesian basalt. variants of which occur in both the eastern and...propose that southward propagation of the back-arc basin spreading center mantle provided heat necessary |  | Zhang, Haitao, Yan, Quanshu, Li, Chuanshun, Zhu, Zhiwei, Zhao, Renjie, Shi, Xuefa (2019) Geochemistry of diverse lava types from the Lau Basin (South West Pacific): Implications for complex backāarc mantle dynamics. Geological Journal, 54 (6) 3643-3659 doi:10.1002/gj.3354 | Journal (article/letter/editorial) | | Geochemistry of diverse lava types from the Lau Basin (South West Pacific): Implications for complex...geochemistry characteristics for the entire backāarc basin are helpful in gaining a better understanding of...compositions of Lau Basin lavas. This data set covered all of the major tectonic units of the basin, for example...example, the Eastern Lau spreading center (ELSC), the Valu Fa ridge (VFR), the Central Lau spreading center...(CLSC), the Northwestern Lau spreading center (NWLSC), the Northeastern Lau spreading center (NELSC) |  | Martinez, Fernando, Taylor, Brian, Baker, Edward T., Resing, Joseph A., Walker, Sharon L. (2006) Opposing trends in crustal thickness and spreading rate along the back-arc Eastern Lau Spreading Center: Implications for controls on ridge morphology, faulting, and hydrothermal activity. Earth and Planetary Science Letters, 245 (3) 655-672 doi:10.1016/j.epsl.2006.03.049 | Journal (article/letter/editorial) | | along the back-arc Eastern Lau Spreading Center: Implications for controls on ridge morphology, faulting,...especially well expressed by the ā¼ 400-km-long Eastern Lau Spreading Center (ELSC) where, approaching the arc...crustal thickness and spreading rate variations on ridge morphology, faulting, and hydrothermal activity...phase of RIDGE2000 Integrated Studies in the Lau back-arc basin. We used deep-towed side-scan sonar instruments...to reach levels higher than the global mid-ocean ridge trend with spreading rate. The observations indicate |  | | Journal (article/letter/editorial) | | chondrite, primitive mantle, normal mid-ocean ridge basalt (N-MORB), and continental crust. Their use in...examples in parentheses are ocean ridges (mid-Atlantic ridge); oceanic (Sunda) and continental (Cascades) magmatic...magmatic arcs; rifted arcs (Japan) and backarcs (Lau Basin); oceanic (Hawaii) and continental (Yellowstone)...the Late Archaean counterpart terranes of India, Southern Africa and Western Australia, might be considered...discriminated island arc, withinplate ocean-island basalt and ocean floor (MORB)dominated belts, based on |  | | Journal (article/letter/editorial) | | composition of hydrothermal precipitates from the Lau back-arc: implications for magmatic contributions...hydrothermal deposits at the Valu Fa Ridge back-arc spreading center in the southern Lau Basin has been investigated...from the White Church area at the northern Valu Fa Ridge have d34S values averaging +3.8& (n Ā 10) for...active Vai Lili hydrothermal Ā®eld at the central Valu Fa Ridge have much higher d34S ratios averaging +8.0&...samples from the Hine Hina area at the southern Valu Fa Ridge have d34S values that are considerably |  | | Report (chapter) | | lavas in light of modern geodynamic contexts in the Tonga and Fiji regions lead us to define three tectonic...active spreading centre of the West Philippine Basin, somewhere around 43-47 Ma. The presence of a mantle...wedge, residual from prior extraction of mid-ocean ridge basalts (MORB) (Crawford et al. 1989). However,...could originate from a refractory ocean island basalt (OIB) mantle source (Sharaskin et al. 1983a, b;...Castillo 1998; Hickey-Vargas 1989), the North Tonga Ridge (Fig. 2b) (Falloon et al. 1989; Falloon & Crawford |  | Kent, Adam J.R., Peate, David W., Newman, Sally, Stolper, Edward M., Pearce, Julian A. (2002) Chlorine in submarine glasses from the Lau Basin: seawater contamination and constraints on the composition of slab-derived fluids. Earth and Planetary Science Letters, 202 (2) 361-377 doi:10.1016/s0012-821x(02)00786-0 | Journal (article/letter/editorial) | | com/locate/epsl Chlorine in submarine glasses from the Lau Basin: seawater contamination and constraints on the...evolved lavas from active spreading centers in the Lau Basin back-arc system provide insight into the processes...mid-ocean ridge basalt. Chlorine contents are highest in fractionated lavas from propagating ridge tips and...recognized. Glasses from the Central Lau Spreading and Eastern Lau Spreading Center typically have low...components also characterizes the Woodlark Basin and North Fiji Basin back-arc systems. The second style of |  | Keith, Manuel, Haase, Karsten M., Klemd, Reiner, Schwarz-Schampera, Ulrich, Franke, Henrike (2017) Systematic variations in magmatic sulphide chemistry from mid-ocean ridges, back-arc basins and island arcs. Chemical Geology, 451. 67-77 doi:10.1016/j.chemgeo.2016.12.028 | Journal (article/letter/editorial) | | situ data of magmatic sulphides from mid-ocean ridge, back-arc and island arc magmatic systems. Iron-Ni-rich...subduction zone magmas opposed to more reduced mid-ocean ridge melts. Large Ni/Cu variations in mss from the same...enriched in S compared to their reduced mid-ocean ridge counterparts (Wallace and Carmichael, 1992; Wallace...liquids in the oceanic crust focused on mid-ocean ridge systems (e.g., Francis, 1990; Peach et al., 1990;...composition (Table 1) were studied from the southern Mid-Atlantic Ridge (SMAR) recovered a long a transect from |  | | Journal (article/letter/editorial) | | Influences of the Tonga Subduction Zone on Seafloor Massive Sulfide Deposits along the Eastern Lau Spreading...Spreading Center and Valu Fa Ridge Guy N. Evans, Margaret K. Tivey, Jeffrey S. Seewald, C. Geoff Wheat PII: DOI:...Influences of the Tonga Subduction Zone on Seafloor Massive Sulfide Deposits along the Eastern Lau Spreading...Spreading Center and Valu Fa Ridge, Geochimica et Cosmochimica Acta (2017), doi: http://dx.doi.org/10.1016/j.gca... Influences of the Tonga Subduction Zone on Seafloor Massive Sulfide Deposits along the Eastern Lau Spreading |  | Keith, Manuel, Haase, Karsten M., Klemd, Reiner, Smith, Daniel J., Schwarz-Schampera, Ulrich, Bach, Wolfgang (2018) Constraints on the source of Cu in a submarine magmatic-hydrothermal system, Brothers volcano, Kermadec island arc. Contributions to Mineralogy and Petrology, 173 (5) doi:10.1007/s00410-018-1470-5 | Journal (article/letter/editorial) | | 2016), as well as SuSu Knolls in the Manus back-arc basin (Craddock and Bach 2010; Craddock et al. 2010; Yeats...(up to 53 ppm) at PACMANUS and SuSu Knolls (Manus Basin; Moss and Scott 2001) have attracted attention for...volatiles (e.g., S and Cl) compared to mid-ocean ridge magmas (Wallace 2005; Richards 2011; Kelley and...basaltic andesite sample was recovered from Brothers Ridge, a young SW-NE striking mafic dyke beneath the Brothers... The natural glass standards VG-2 (basalt glass), VG-A99 (basalt glass) and VG-568 (rhyolite glass) of |  | | Journal (article/letter/editorial) | | successfully to demonstrate that the lavas of the arc-basin terrains of the SW Pacific are derived from two...fingerprinting to the back-arc basin basalts and boninites of the Lau and North Fiji Basins and the volcanic...volcanic arc lavas of the Kermadec, Tonga and Vanuatu arcs. Fingerprinting is facilitated by the observation...the trench which only entered the SW Pacific arc-basin system after the Ontong-Java Plateau collision removed...south-propagating ridges in the North Fiji and NW Lau Basins, undergoing progressive depletion until the |  | Fouquet, Yves, von Stackelberg, Ulrich, Charlou, Jean Luc, Erzinger, Joerg, Herzig, Peter M., Muehe, Richard, Wiedicke, Michael (1993) Metallogenesis in back-arc environments; the Lau Basin example. Economic Geology, 88 (8) 2154-2181 doi:10.2113/gsecongeo.88.8.2154 | Journal (article/letter/editorial) | | 2154-2181 Metallogenesis in Back-ArcEnvironments' The Lau BasinExample YVESFOUQUET, IFREMER, Centre de Brest...hydrothermal activityon a modernback-arcvolcanicridge,the Valu Fa Ridge.Three majorhydrothermalfields(Hine Hina,...the developmentof sulfidemounds. Vent fluidsat Valu Fa havemuchhighermetalcontentsthanthoseat midoceanridges...54-2854.00 2154 BACK-ARC ENVIRONMENTS: LA U BASIN 215 5 17Ćø30'S and 19Ćø20' S, locatedat the centralpart...there have been a number of Sand22Ćø50' S (ValuFa Ridge),located75 km closer investigations of hydrothermalprocesses |  | | Journal (article/letter/editorial) | | Miyashiro's thesis was that sub-alkalic mid-ocean ridge lavas all belong to the tholeiitic series, whereas...publications (e.g. Arculus, 2003). It shows that mid-ocean ridge lavas and calculated Skaergaard liquids follow steep...island arcs, which Miyashiro exempliļ¬ed by Tofua (Tonga arc) and Miyakejima (Izu arc), follow shallower...both SiO2 and FeO*/MgO (not shown) than mid-ocean ridge tholeiites. His SiO2 62 J.A. Pearce, P.T. Robinson...hypothesis. Miyashiro recognised that a marginal basin setting had to be considered as well as an island |
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