Sources of constructional cross‐chain volcanism in the southern Havre Trough: New insights from HFSE and REE concentration and isotope systematics

Todd, Erin; Gill, James B.; Wysoczanski, Richard J.; Handler, Monica R.; Wright, I. C.; Gamble, J. A.

doi:10.1029/2009gc002888

Cited by 60 publications

(136 citation statements)

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“…Consistent with previous studies and with experimental observations indicating that high field strength and rare-earth elements (HFSE and REE) are relatively insoluble in hydrous fluids (Brenan, et al, 1995, Class, et al, 2000, these results indicate that Hf and Nd in Aleutian lavas are mobilized out of bulk sediment , Kay, 1980 or in a sediment-silicate melt component (Plank and Langmuir, 1993, Elliott, et al, 1997, Class, et al, 2000, Tollstrup and Gill, 2005. In turn, and consistent with other recent studies (Marini, et al, 2005, Carpentier, et al, 2009, Todd, et al, 2010, Tollstrup, et al, 2010, these results imply that Hf is effectively mobilized from the top of the subducting plate beneath the Aleutian arc, and that the Hf isotopic compositions of Aleutian lavas are therefore not a direct reflection of Hf compositions in sub-arc mantle wedge (i.e., Hf is not a 'conservative' element Pearce, et al, 1999).…”

Section: Introductionsupporting

confidence: 82%

“…These results clearly show that Hf and perhaps other HFSEs, do not exhibit conservative behavior in the Aleutian subduction zone as has been hypothesized for some other arc systems (Pearce, et al, 1999, Münker, et al, 2004. Combined with recent findings from other arcs, these data indicate that Hf is commonly mobilized out of the subducted sediment pile beneath a variety of island arc systems (Marini, et al, 2005, Tollstrup and Gill, 2005, Carpentier, et al, 2009, Todd, et al, 2010, Tollstrup, et al, 2010) (Marini, et al, 2005, Tollstrup and Gill, 2005, Carpentier, et al, 2009, Todd, et al, 2010, Tollstrup, et al, 2010.…”

Section: Along-arc Patterns Bulk Mixing and Sediment Contribution Essupporting

confidence: 59%

“…Experimental results indicating that water-saturated melting of sediment at 3-4 GPa will commence at 700-800°C (Schmidt, et al, 2004, Hermann andSpandler, 2008), are consistent with slab-surface temperature estimates from subduction zone thermal models that invoke temperature and stress-dependent viscosities in the mantle wedge (van Keken, et al, 2002, Kelemen, et al, 2003b, Conder, 2005. These combined experimental and modeling results indicate that melting of subducted sediment should be common in the Aleutians and in subduction zones worldwide, as predicted by various geochemical observations (Plank andLangmuir, 1993, Elliott, et al, 1997) including the Hf isotope data presented here and in other recent Hf-Nd isotope studies of island arc lavas (Tollstrup and Gill, 2005, Todd et al, 2010, Tollstrup et al, 2010.…”

Section: Nature Of the Sediment Componentmentioning

confidence: 53%

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Subduction controls of Hf and Nd isotopes in lavas of the Aleutian island arc

Yogodzinski

Vervoort

Brown

et al. 2010

Earth and Planetary Science Letters

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Section: Introductionsupporting

confidence: 82%

Section: Along-arc Patterns Bulk Mixing and Sediment Contribution Essupporting

confidence: 59%

Section: Nature Of the Sediment Componentmentioning

confidence: 53%

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Subduction controls of Hf and Nd isotopes in lavas of the Aleutian island arc

Yogodzinski

Vervoort

Brown

et al. 2010

Earth and Planetary Science Letters

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“…43). Previously, variations in trace element ratios and isotope compositions of rather conservative elements in southern Kermadec arc lavas were attributed to ambient mantle heterogeneity predating the geochemical imprint of the subducting slab 36 . Although ambient mantle wedge heterogeneities (and/or the involvement of deep crustal or lithospheric mantle fragments of rifted Gondwana continental material) could account for the observed isotopic Kermadec arc lava heterogeneities, the simultaneous increase in Pb and Sr but decrease in Nd isotope values, together with the aforementioned observations, plausibly argues for Hikurangi Plateau subduction-related processes causing the observed isotopic changes south of B32°S.…”

Section: Resultsmentioning

confidence: 99%

Subduction of the oceanic Hikurangi Plateau and its impact on the Kermadec arc

et al. 2014

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Large igneous province subduction is a rare process on Earth. A modern example is the subduction of the oceanic Hikurangi Plateau beneath the southern Kermadec arc, offshore New Zealand. This segment of the arc has the largest total lava volume erupted and the highest volcano density of the entire Kermadec arc. Here we show that Kermadec arc lavas south of B32°S have elevated Pb and Sr and low Nd isotope ratios, which argues, together with increasing seafloor depth, forearc retreat and crustal thinning, for initial Hikurangi Plateau-Kermadec arc collision B250 km north of its present position. The combined data set indicates that a much larger portion of the Hikurangi Plateau (the missing Ontong Java Nui piece) than previously believed has already been subducted. Oblique plate convergence caused southward migration of the thickened and buoyant oceanic plateau crust, creating a buoyant 'Hikurangi' mélange beneath the Moho that interacts with ascending arc melts.

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“…Such long-lived magmatism along narrow loci suggests lithospheric structural control. Cross-arc chains in the Kermadec arc such as Rumble V Ridge are likely to have a similar origin (Wright et al, 1996;Todd et al, 2010;Wysoczanski et al, 2010). However, there is thought to be no age progression along Rumble V Ridge in the Kermadec arc, with recently erupted lava observed along its length, and Wysoczanski et al (2010) concluded that the ridge represents the surface expression of a zone of dyke intrusion in the crust.…”

mentioning

confidence: 99%

Volcanic evolution of the South Sandwich volcanic arc, South Atlantic, from multibeam bathymetry

Leat

Day

Tate

et al. 2013

Journal of Volcanology and Geothermal Research

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New multibeam bathymetry data are presented for the South Sandwich intra-oceanic arc which occupies the small Sandwich plate in the South Atlantic, and is widely considered to be a simple end-member in the range of intra-oceanic arc types. The images show for the first time the distribution of submarine volcanic, tectonic and erosional-depositional features along the whole length of the 540 km long volcanic arc, allowing systematic investigation of along-arc variations. The data confirm that the volcanic arc has a simple structure composed of large volcanoes which form a well-defined volcanic front, but with three parallel crosscutting seamount chains extending 38-60 km from near the volcanic front into the rear-arc. There is no evidence for intra-arc rifting or extinct volcanic lines. Topographic evidence for faulting is generally absent, except near the northern and southern plate boundaries. Most of the volcanic arc appears to be built on ocean crust formed at the associated back-arc spreading centre, as previously proposed from magnetic data, but the southern part of the arc appears to be underlain by older arc or continental crust whose west-facing rifted margin facing the back-arc basin is defined by the new bathymetry. The new survey shows nine main volcanic edifices along the volcanic front and ca. 20 main seamounts. The main volcanoes form largely glaciated islands with summits 3.0-3.5 km above base levels which are 2500-3000 m deep in the north and shallower at 2000-2500 m deep in the south. Some of the component seamounts are interpreted to have been active since the last glacial maximum, and so are approximately contemporaneous with the volcanic front volcanism. Seven calderas, all either submarine or ice-filled, have been identified: Adventure volcano, a newly discovered submarine volcanic front caldera volcano is described for the first time. All but one of the calderas are situated on summits of large volcanoes in the southern part of the arc, and most are associated with current or historic volcanic or hydrothermal activity. Shallow shelves around the islands are generally 1-10 km wide. Submerged banks up to 1100 m deep are interpreted as subsided erosional surfaces. Seamounts and emergent volcanoes experienced a range of mass wasting processes including by landsliding and smaller mass flows. KeywordsVolcanic arc, subduction zone, caldera, seamount, submarine volcanism The importance of the South Sandwich volcanic arcThe South Sandwich volcanic arc, situated in the South Atlantic ( Fig. 1), is a tectonically simple, active, intra-oceanic arc, and is ideally suited to studies of volcanic arc crustal structure, geochemical investigation of mantle processes above a subduction zone, and sedimentation in an early stage of arc evolution. The active arc is built largely on oceanic crust of the small Sandwich plate which formed about 10 Ma at the back-arc East Scotia ridge spreading centre . The arc is forming in response to steeply inclined subduction of the South American plate beneath the Sand...

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Sources of constructional cross‐chain volcanism in the southern Havre Trough: New insights from HFSE and REE concentration and isotope systematics

Cited by 60 publications

References 103 publications

Subduction controls of Hf and Nd isotopes in lavas of the Aleutian island arc

Subduction controls of Hf and Nd isotopes in lavas of the Aleutian island arc

Subduction of the oceanic Hikurangi Plateau and its impact on the Kermadec arc

Volcanic evolution of the South Sandwich volcanic arc, South Atlantic, from multibeam bathymetry

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