Chemical heterogeneity in the Hawaiian mantle plume from the alteration and dehydration of recycled oceanic crust

Pietruszka, A. J.; Norman, Marc D.; Garcia, Michael O.; Marske, J. P.; Burns, Dale H.

doi:10.1016/j.epsl.2012.10.030

Cited by 78 publications

(52 citation statements)

References 76 publications

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“…However, there is growing petrologic and geochemical evidence, especially at Hawaii, for the presence of eclogite in the magma source region (Hauri, 1996;Farnetani and Samuel, 2005;Sobolev et al, 2005Sobolev et al, , 2007Herzberg, 2011;Jackson et al, 2012;Pietruszka et al, 2013), thought to originate from subducted oceanic crust and to be entrained by upwelling flow in the lower mantle (e.g., Deschamps et al, 2011). Because eclogite is denser than peridotite throughout the upper mantle and most of the lower mantle (Hirose, 2002;Aoki and Takahashi, 2004), the ascent of plumes containing both peridotite and eclogite will be influenced by a competition between non-diffusive, negative chemical buoyancy and diffusive, positive thermal buoyancy (e.g., Davaille, 1999).…”

Section: E-mail Address: Ballmer@hawaiiedu (Md Ballmer)mentioning

confidence: 99%

Double layering of a thermochemical plume in the upper mantle beneath Hawaii

Ballmer

Ito

Wolfe

et al. 2013

Earth and Planetary Science Letters

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Section: E-mail Address: Ballmer@hawaiiedu (Md Ballmer)mentioning

confidence: 99%

Double layering of a thermochemical plume in the upper mantle beneath Hawaii

Ballmer

Ito

Wolfe

et al. 2013

Earth and Planetary Science Letters

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“…The same as Fig. The velocity perturbation scale is shown on the right amount, type and extent of dehydration of the ancient recycled oceanic crust(Pietruszka et al 2013). (Modified from Zhao 2007) P-wave velocitythe residual slab.…”

mentioning

confidence: 99%

Multiscale Seismic Tomography

Zhao

2015

100

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“…Variation in Ti/Gd versus Sm/Yb for the Longhai basalts, their various source components, and invoked mixing relations. We have calculated the composition of the recycled oceanic crust for different degrees of dehydration (from 0% to 15%, red line), following the method of Pietruszka et al []. Melting models were calculated for fractional melting of garnet peridotite, carbonated peridotite, eclogite, and carbonated eclogite.…”

Section: Discussionmentioning

confidence: 99%

Magma‐magma interaction in the mantle beneath eastern China

Zeng

Chen

et al. 2017

JGR Solid Earth

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In addition to magma‐rock and rock‐rock reaction, magma‐magma interaction at mantle depth has recently been proposed as an alternative mechanism to produce the compositional diversity of intraplate basalts. However, up to now no compelling geochemical evidence supports this novel hypothesis. Here we present geochemistry for the Longhai basalts from Fujian Province, southeastern China, which demonstrates the interaction between two types of magma at mantle depth. At Longhai, the basalts form two groups, low‐Ti basalts (TiO2/MgO < 0.25) and high‐Ti basalts (TiO2/MgO > 0.25). Calculated primary compositions of the low‐Ti basalts have compositions close to L + Opx + Cpx + Grt cotectic, and they also have low CaO contents (7.1–8.1 wt %), suggesting a mainly pyroxenite source. Correlations of Ti/Gd and Zr/Hf with the Sm/Yb ratios, however, record binary mixing between the pyroxenite‐derived melt and a second, subordinate source‐derived melt. Melts from this second source component have low Ti/Gd and high Zr/Hf and Ca/Al ratios, thus likely representing a carbonated component. The Sr, Nd, Hf, and Pb isotopic compositions of the high‐Ti basalts are close to the low‐Ti basalts. The Sm/Yb ratio of the high‐Ti basalts, however, is markedly elevated and characterized by crossing rare earth element patterns at Ho, suggesting that they have source components comparable to the low‐Ti basalts, but that they have experienced garnet and clinopyroxene fractionation. We posit that mingling of SiO2‐saturated tholeiitic magma with SiO2‐undersaturated alkaline magma might trigger such fractionation. Therefore, the model of magma‐magma interaction and associated deep evolution of magma in the mantle is proposed to explain the formation of Longhai basalts. It may, moreover, serve as a conceptual model for the formation of tholeiitic to alkaline intraplate basalts worldwide.

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Chemical heterogeneity in the Hawaiian mantle plume from the alteration and dehydration of recycled oceanic crust

Cited by 78 publications

References 76 publications

Double layering of a thermochemical plume in the upper mantle beneath Hawaii

Double layering of a thermochemical plume in the upper mantle beneath Hawaii

Multiscale Seismic Tomography

Magma‐magma interaction in the mantle beneath eastern China

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