Ce and Nd isotope geochemistry on island arc volcanic rocks with negative Ce anomaly: existence of sources with concave REE patterns in the mantle beneath the Solomon and Bonin island arcs

Shimizu, Hiroshi; Sawatari, Hideyuki; Kawata, Y.; Dunkley, P. N.; Masuda, Akimasa

doi:10.1007/bf00310741

Cited by 50 publications

(25 citation statements)

References 41 publications

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“…= 38 ppm, n = 10). The analytical precision on natural samples is improved by a factor of about 4 in relation to previous studies on island arcs (Tanaka et al, 1987;Shimizu et al, 1992). The 138 Ce/ 142 Ce ratios of the two chondrites are identical within uncertainty and similar to previous determinations done on other meteorites; the average value is 0.0225654 ± 7 (2 s.d.…”

supporting

confidence: 64%

Ce isotope systematics of island arc lavas from the Lesser Antilles

Bellot

Boyet

Doucelance

et al. 2015

Geochimica et Cosmochimica Acta

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supporting

confidence: 64%

Ce isotope systematics of island arc lavas from the Lesser Antilles

Bellot

Boyet

Doucelance

et al. 2015

Geochimica et Cosmochimica Acta

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“…Small negative Ce anomalies are observed for these samples. It implies that some subducted pelagic sediments with negative Ce anomalies have been transported into arc magma source or alternatively there existed a sources with concave REE patterns in the mantle (Shimizu et al, 1992) beneath the study area during Meso-Neoproterozoic. Moreover, all REE patterns show negative Eu anomalies [Eu/Eu*] 0.76~0.93 (Table 1).…”

Section: Fig 3 Plot Of Zr/tio 2 -Nb/y For Mafic-ultramafic Rocks Frmentioning

confidence: 95%

Geochemistry of Meso- and Neoproterozoic mafic-ultramafic rocks from northern Guangxi, China: Arc or plume magmatism?

et al. 2004

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Meso-and Neoproterozoic mafic-ultramafic rocks from northern Guangxi show mainly calc-alkaline features. The mafic rocks have (Nb/La) pm 1) = 0.13~0.51, (Th/La) pm = 0.85~3.3, Ti/Ti* 2) = 0.29~0.79 and show negative Nb and Ti anomalies in primitive mantle normalized diagrams. The Mesoproterozoic mafic rocks have lower ε Nd (T) than those of Neoproterozoic, -1.99 ~ -5.13 vs. -0.74 ~ 2.4, respectively. They plot in the field of volcanic arc basalt in tectonic discrimination diagrams and display geochemical signatures of island arc volcanics. The mafic-ultramafic rocks are thought to be the products of magmatism of convergent plate boundary rather than derived from mantle plume. Therefore, they can not be regarded as an indicator of breakup of Rodinia supercontinent.

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“…Negative Ce-anomalies in sedimentary rocks can result either by prolonged sub-aquatic weathering (Küster and Liégeois, 2001) or by post-depositional alterations such as pervasive circulation of hydrothermal fluids (Abouchami et al, 1990). However, Ce-anomalies in sediments can also be inherited from their source rocks, in that case from magmatic rocks where they are common (Shimizu et al, 1992).…”

Section: Metagraywackesmentioning

confidence: 99%

Geochemistry of Paleoproterozoic metasedimentary rocks from the Birim diamondiferous field, southern Ghana: Implications for provenance and crustal evolution at the Archean-Proterozoic boundary

Asiedu¹,

Dampare²,

Sakyi³

et al. 2004

Geochem. J.

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Metagraywackes and metapelites from the Paleoproterozoic Birimian Supergroup in the Birim diamondiferous field, southern Ghana, were analyzed for their major and trace element contents. Compared to early Proterozoic crust, the metasedimentary rocks are enriched in ferromagnesian elements but depleted in rare earth elements (REE), high field strength elements (HFSE) (with exception of Zr), and Th. They show REE patterns similar to their Archean counterparts. The chemical data indicate that the sediments were derived from a local source of mixed felsic-mafic composition, with the latter dominating. The source rocks were the basaltic to dacitic volcanic rocks and granitoids within the Birimian greenstone belts. The chemical data further suggest their deposition in a tectonic setting comparable to modern island arcs, and that minimal old upper crust (i.e., pre-Birimian sources) was involved in their formation. The analyzed metasedimentary rocks have Eu-anomalies and Gd N /Yb N , Sm/Nd, Th/Sc, Cr/Sc and Cr/Th ratios that closely resemble those of their Archean counterparts, and therefore inconsistent with models suggesting abrupt compositional changes in upper crust at the Archean-Proterozoic boundary.

show abstract

Ce and Nd isotope geochemistry on island arc volcanic rocks with negative Ce anomaly: existence of sources with concave REE patterns in the mantle beneath the Solomon and Bonin island arcs

Cited by 50 publications

References 41 publications

Ce isotope systematics of island arc lavas from the Lesser Antilles

Ce isotope systematics of island arc lavas from the Lesser Antilles

Geochemistry of Meso- and Neoproterozoic mafic-ultramafic rocks from northern Guangxi, China: Arc or plume magmatism?

Geochemistry of Paleoproterozoic metasedimentary rocks from the Birim diamondiferous field, southern Ghana: Implications for provenance and crustal evolution at the Archean-Proterozoic boundary

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