Major and trace element and Sr–Nd isotope signatures of lavas from the Central Lau Basin: Implications for the nature and influence of subduction components in the back-arc mantle

Tian, Liyan; Castillo, Paterno R.; Hawkins, James W.; Hilton, David R.; Hanan, B. B.; Pietruszka, A. J.

doi:10.1016/j.jvolgeores.2008.06.039

Cited by 81 publications

(86 citation statements)

References 53 publications

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“…The analytical methods used and precision and accuracy of the measurements are described in Tian et al (2008). Poreda and Craig (1992).…”

Section: Methodsmentioning

confidence: 99%

“…The Lau Basin has seen concerted research activities in recent years, aimed at understanding its geological, tectonic, geochemical, and hydrothermal evolution (e.g., Baker et al, 2006;Jacobs et al, 2007;Pearce et al, 2007;Tian et al, 2008;Bezos et al, 2009;Escrig et al, 2009). This stems, in part, from its selection as an Integrated Study Site (ISS) as part of the Ridge 2000 Program of the US National Science Foundation.…”

Section: Introductionmentioning

confidence: 99%

“…We utilize samples collected on three expeditions to the Lau Basin (see Section 2) thus gaining access to a broad coverage of various eruptive centers throughout the region. The same sample suite has already been utilized for complementary geochemical studies, e.g., major/trace elements and Sr-Nd isotopes, in the eastern Lau Basin (Tian et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

An overview of the volatile systematics of the Lau Basin – Resolving the effects of source variation, magmatic degassing and crustal contamination

Hahm

Hilton

Castillo

et al. 2012

Geochimica et Cosmochimica Acta

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“…The analytical methods used and precision and accuracy of the measurements are described in Tian et al (2008). Poreda and Craig (1992).…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

An overview of the volatile systematics of the Lau Basin – Resolving the effects of source variation, magmatic degassing and crustal contamination

Hahm

Hilton

Castillo

et al. 2012

Geochimica et Cosmochimica Acta

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“…Mongo dolerite compositions are very distinct from typical arc-type tholeiite as proposed by Jakeš and Gill [44], shown in Th-Hf-Ta [45] and Th-Tb-Ta diagrams [17]. Accordingly, the arc-type features [46,47] exhibited by some Mongo dolerites should be related to the addition of terrigenous sediments in mantle source, as proposed by Wayne [38] for Huronian low-Ti continental tholeiites.…”

Section: Nature Of the Mantle Sourcementioning

confidence: 64%

“…High Ba/Nb (31-74) and Th/Ta (2-5) evidence an orogenic context [46,47], also shown in the Th-Tb-Ta diagram ( [17], Figure 6A). Incompatible elements (Table 1 and Figure 7A) exhibit negative anomalies in Nb and Ta and differ from positive anomalies in Initial Rift Tholeiite (IRT, [25]), thus preventing a relationship with a rifting environment (Figure 11).…”

Section: Geodynamic Implicationmentioning

confidence: 83%

The dolerite dyke swarm of Mongo, Guéra Massif (Chad, Central Africa): Geological setting, petrography and geochemistry

et al. 2017

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Dolerite dykes are widespread in the Mongo area within the granitic Guéra Massif (Chad, Central Africa). Dykes are several hundred metres to several kilometres long, a metre to decametre thick, and vertical, crosscutting the Pan-African granitic basement rocks. They are controlled by major Pan-African NNE-SSW, NE-SW and ENE-WSW faults. Rocks constituting the dykes exhibit typical doleritic textures (i.e. intergranular, ophitic or subophitic). They are mainly composed of phenocrysts, microcrysts and microlites of clinopyroxene, amphibole, plagioclase, alkali feldspar and Fe-Ti oxides. Mongo dolerites are classified into two groups: Group 1 of basalt and trachybasalt and Group 2 of basaltic trachyandesite, which follow a trend with continental tholeiite affinities, and are differentiated through fractional crystallization. Trace element enrichment and REE contents show the high melting degree at shallow depths of enriched sub-continental lithospheric mantle, whose composition is intermediate between OIB and MORB, contaminated by small amounts of sediment during older subduction. Mongo dolerites are interpreted as imprints of either the final stage of stabilization of ancient continental crust, or the initiation of tectonic activity related to Pan-African mobile belts.

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Evidence for a broadly distributed Samoan-plume signature in the northern Lau and North Fiji Basins

Price

Jackson

Blichert‐Toft

et al. 2014

Geochem. Geophys. Geosyst.

104

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Geochemical enrichment of lavas in the northern Lau Basin may reflect the influx of Samoanplume mantle into the region. We report major and trace element abundances and He-Sr-Nd-Hf-Pbisotopic measurements for 23 submarine volcanic glasses covering 10 locations in the northern Lau and North Fiji Basins, and for three samples from Wallis Island, which lies between Samoa and the Lau Basin. These data extend the western limit of geochemical observations in the Basins and improve the resolution of North-South variations in isotopic ratios. The Samoan hot spot track runs along the length of the northern trace of the Lau and North Fiji Basins. We find evidence for a Samoan-plume component in lavas as far West as South Pandora Ridge (SPR), North Fiji Basin. Isotopic signatures in SPR samples are similar to those found in Samoan Upolu shield lavas, but show a slight shift toward MORB-like compositions. We explain the origin of the enriched signatures by a model in which Samoan-plume material and ambient depleted mantle undergo decompression melting during upwelling after transiting from beneath the thick Pacific lithosphere to beneath the thin lithosphere in the northern Lau and North Fiji Basins. Other lavas found in the region with highly depleted isotopic signatures may represent isolated pockets of depleted mantle in the basins that evaded this enrichment process. We further find that mixing between the two components in our model, a variably degassed high-3 He/ 4He Samoan component and depleted MORB, can explain the diversity among geochemical data from the northern Lau Basin.

show abstract

Major and trace element and Sr–Nd isotope signatures of lavas from the Central Lau Basin: Implications for the nature and influence of subduction components in the back-arc mantle

Cited by 81 publications

References 53 publications

An overview of the volatile systematics of the Lau Basin – Resolving the effects of source variation, magmatic degassing and crustal contamination

An overview of the volatile systematics of the Lau Basin – Resolving the effects of source variation, magmatic degassing and crustal contamination

The dolerite dyke swarm of Mongo, Guéra Massif (Chad, Central Africa): Geological setting, petrography and geochemistry

Evidence for a broadly distributed Samoan-plume signature in the northern Lau and North Fiji Basins

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