On the composition of ocean island basalts (OIB): The effects of lithospheric thickness variation and mantle metasomatism

Humphreys, E. R.; Niu, Yaoling

doi:10.1016/j.lithos.2009.04.038

Cited by 179 publications

(134 citation statements)

References 139 publications

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“…Thus, we also interpret the geochemical features of our samples from the perspective of OIBs. Humphreys and Niu (2009) and Niu et al (2011), evaluated the whole-rock geochemical compositions of OIBs for plate ages up to ca. 80 Ma, and determined a global trend for the systematic relationship between crustal thickness and geochemical compositions.…”

Section: Discussionmentioning

confidence: 99%

Enriched mid–ocean ridge basalt–type geochemistry of basalts and gabbros from the Nikoro Group, Tokoro Belt, Hokkaido, Japan

Yamasaki

Nanayama

2017

Journal of Mineralogical and Petrological Sciences

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The Tokoro Belt is a subduction complex located in eastern Hokkaido, Japan. The Nikoro Group, a constituent of the Tokoro Belt, is composed mainly of Late Jurassic to Early Cretaceous igneous rocks intercalated with bedded chert and limestone. These rocks have been regarded as fragments of seamounts. Here, we report new whole-rock geochemistry, clinopyroxene major and trace element compositions of the basalts and gabbros, and re-evaluate the origin and geodynamic setting of the Nikoro Group. The gabbros showed ophitic texture and contain fresh, large oikocrystic clinopyroxenes. Fe-Mg partitioning between the clinopyroxenes and wholerock (i.e., melt) can be regarded as in equilibrium. The trace element composition of the clinopyroxenes within the gabbros and the whole-rock geochemistry of the gabbroic rocks are almost identical to the basalts. This evidence suggests that the whole-rock compositions were not extensively modified and the gabbroic rocks represent the melt composition. Whole-rock trace elements indicated Enriched Mid-Ocean Ridge Basalt (E-MORB)-type patterns as well as 'garnet signatures' [e.g., (Sm/Yb) N > 1]. After correction of the gabbros and basalts for the fractionation effect to Mg# = 0.72, the whole-rock chemistry suggests a significantly shallow lithosphere-asthenosphere boundary depth of~0-km. Whole-rock (Sm/Yb) N ratios also confirm the same results. These geochemical results constrain the geodynamic setting of the Nikoro Group; the greenstone most likely originated from a plume-influenced ridge in the Pacific Ocean basin during the Middle Jurassic to Early Cretaceous.

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Section: Discussionmentioning

confidence: 99%

Enriched mid–ocean ridge basalt–type geochemistry of basalts and gabbros from the Nikoro Group, Tokoro Belt, Hokkaido, Japan

Yamasaki

Nanayama

2017

Journal of Mineralogical and Petrological Sciences

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“…Recent observations (Humphreys and Niu, 2009;Niu et al, 2011) demonstrate that on a global scale, the intra-plate ocean island basalts show compositional variation that is, in simple clarity, consistent with the lithosphere thickness variation, i.e., the lithosphere thickness controls the composition of the erupted basalts or the "lid effect" (Ellam, 1992;Niu et al, 2011). That is, the extent of melting is lower beneath the thicker lithosphere with the melt having higher abundances of incompatible elements and stronger garnet signature than beneath the thinner lithosphere.…”

Section: Lithosphere Thinning In West Nccmentioning

confidence: 98%

Lithosphere thinning beneath west North China Craton: Evidence from geochemical and Sr–Nd–Hf isotope compositions of Jining basalts

Guo

Niu

et al. 2014

Lithos

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This study shows lithosphere evolution history in the west North China Craton (NCC) from the early Cretaceous to Quaternary by studying the major element, trace element and Sr-Nd-Hf isotope compositions in Jining basalts of 119.6108.6 Ma, 23.521.9 Ma and 1.30.11 Ma.The early Cretaceous basalts (119.6108.6 Ma) display enriched characteristics with high contents of incompatible elements, high 87 Sr/ 86 Sr i , low ε Nd (t) and low ε Hf (t). These basalts resulted from partial melting of ancient metasomatized lithospheric mantle, and we consider the 119.6108.6 Ma magmatism as indicating lithosphere thinning in the west NCC. Although the Pacific slab seen seismically in the mantle transition zone beneath eastern China is no older than 60 Ma, there exists convincing evidence for the presence of the Paleo-Pacific slab in the transition-zone in the Mesozoic. Thus we propose that the water released from the transition-zone slab hydrated A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPTthe overlying lithosphere and further converted the base of the lithosphere into asthenosphere. This is the most likely mechanism responsible for the lithosphere thinning in the west NCC and the petrogenesis of the Jining 119.6108.6 Ma basalts. Sr i , high ε Nd (t) and high ε Hf (t). Upwelling and decompression melting of the eastward flowing asthenosphere from beneath western plateaus to beneath eastern hilly plains in the Cenozoic is the most plausible mechanism for the petrogenesis of Jining Cenozoic basalts (both of 23.521.9 Ma and 1.30.11 Ma), but the Jining 1.30.11 Ma basalts must have been produced beneath even thinner lithosphere.Taken together geophysical studies and our petrological and geochemical studies of all these three episodes of the Jining basalts, wepropose that the lithosphere in the west NCC has been thinning since the early Cretaceous and the thinning continues to the present.

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“…This source has been enriched from LREE and then melted to form the parent melts of Lut-Sistan alkali basalts (Pang et al, 2012). According to Pang et al (2012), such enrichment that occurred in eastern Iran can be seen in the western Lut region due to exodus of melts or volatile-rich fluids released from the seismic low velocity region (Niu, 2008;Humphreys and Niu, 2009) or from the subsolidus peridotite just before melting (Zou and Zindler, 1996) into the asthenosphere. (Boynton, 1984) rare earth elements patterns for basalts from the Gandom Beryan basanitic rocks.…”

Section: Strontium Neodymium and Lead Isotopesmentioning

confidence: 99%

Petrogenesis of Plio-Quaternary basanites in the Gandom Beryan area, Kerman,Iran: geochemical evidence for the low-degree partial melting of enriched mantle

Yousefi¹,

Moradian²,

Ahmadipour³

2017

Turkish J Earth Sci

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In the Gandom Beryan area, basanitic lava flows erupted from fractures in the Nayband fault zone and formed an area of about 300 km 2 of basanitic rocks in the western part of the Lut Block. Olivine and clinopyroxene are the major phenocrysts in a microlitic groundmass for these basanitic rocks. The geochemical data show that Gandom Beryan rocks are basanite in composition and belong to intercontinental rifts related to alkali basanites. These rocks have low Fe/Mg ratios (Fe 2 O 3t /MgO = 1.07-1.43) with low silica content (SiO 2 = 44.89-48.26 wt.%) and are high-Ti basanites. The investigated rocks are characterized by a significant enrichment of total REE and LREE relative to chondrite. Moreover, the REE patterns of these rocks are linear without any negative Eu anomalies. The low abundances of HREE in basanitic rocks and the REE modeling together reflect the relation between these elements and residual garnet in the partially melted mantle. The 207 Pb/ 204 Pb and 206 Pb/ 204 Pb ratios of the basanitic rocks fall near the field of enriched mantle II (EM-II). The Gandom Beryan volcanism, which was related to partial melting of mantle within an extensional setting, resulted from a left-step, pull-apart basin in the Nayband N-S trending strike-slip fault system. Although the fault system is older than Gandom Beryan volcanism, it seems that it has been reactivated during and after the volcanism.

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On the composition of ocean island basalts (OIB): The effects of lithospheric thickness variation and mantle metasomatism

Cited by 179 publications

References 139 publications

Enriched mid–ocean ridge basalt–type geochemistry of basalts and gabbros from the Nikoro Group, Tokoro Belt, Hokkaido, Japan

Enriched mid–ocean ridge basalt–type geochemistry of basalts and gabbros from the Nikoro Group, Tokoro Belt, Hokkaido, Japan

Lithosphere thinning beneath west North China Craton: Evidence from geochemical and Sr–Nd–Hf isotope compositions of Jining basalts

Petrogenesis of Plio-Quaternary basanites in the Gandom Beryan area, Kerman,Iran: geochemical evidence for the low-degree partial melting of enriched mantle

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