Plume versus plate origin for the Shatsky Rise oceanic plateau (NW Pacific): Insights from Nd, Pb and Hf isotopes

Heydolph, Ken; Murphy, David T.; Geldmacher, Jörg; Романова, И. В.; Greene, Andrew R.; Hoernle, Kaj; Weis, Dominique; Mahoney, John J.

doi:10.1016/j.lithos.2014.03.031

Cited by 46 publications

(51 citation statements)

References 96 publications

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“…Mahoney et al, 1993), Hikurangi Plateau (Timm et al, 2011), the Caribbean-Columbian plateau (e.g. Hauff et al, 2000) and Shatsky Rise (e.g., Heydolph et al, 2014), which show little geochemical variation, have largely intermediate composition between MORB, HIMU and EM, and are similar to each other and similar to the assumed composition of the lower mantle (e.g. represented by FOZO, Hart et al 1992).…”

Section: Accepted M Manuscriptmentioning

confidence: 96%

“…The observation that Shatsky volcanism becomes geochemically more heterogeneous with time, decreasing eruption volume, and lower degrees of melting Heydolph et al 2014) may support the involvement of a plume (head). According to numerical plume head models (e.g., Farnetani and Richards, 1994;Farnetani et al, 2002), such geochemical evolution could reflect less effective stirring, mixing and progressively lower A C C E P T E D M A N U S C R I P T degrees of melting during the transition from a waning plume head (Tamu Massif) to a plume tail (Shirshov Massif and Papanin Ridge).…”

Section: Accepted M Manuscriptmentioning

confidence: 99%

“…Other observations have been interpreted as fitting the plume model as follows. Evidence for incompatible trace-element and isotopic enrichment of the high-Nb lavas Heydolph et al, 2014) and (lower than MORB) 3 He/ 4 He ratios of normal type lavas from Ori Massif (Hanyu et al, 2015) are interpreted as indication of recycled oceanic crust in the magma source. This interpretation favors a plume model if one assumes that recycled crust descended with a subducted plate into the deep mantle and returned to the surface with a plume .…”

Section: Plume and Plate?mentioning

confidence: 99%

“…Abnormal mantle conditions are shown by geochemistry and isotopic signatures, which imply deeper melting with higher degrees of partial melt and traces of recycled crust Prytulak et al, 2013;Husen et al, 2013;Heydolph et al, 2014;Hanyu et al, 2015).…”

Section: Plume and Plate?mentioning

confidence: 99%

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Formation and evolution of Shatsky Rise oceanic plateau: Insights from IODP Expedition 324 and recent geophysical cruises

Sager

Sano

Geldmacher

2016

Earth-Science Reviews

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Section: Accepted M Manuscriptmentioning

confidence: 96%

Section: Accepted M Manuscriptmentioning

confidence: 99%

Section: Plume and Plate?mentioning

confidence: 99%

Section: Plume and Plate?mentioning

confidence: 99%

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Formation and evolution of Shatsky Rise oceanic plateau: Insights from IODP Expedition 324 and recent geophysical cruises

Sager

Sano

Geldmacher

2016

Earth-Science Reviews

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“…Melting curves show model calculations of non-modal batch melting of source mantle. Primitive mantle (PM) depleted by the extraction of 1% continental crust (CC; PM-CC in A) is assumed for the OJP mantle source (Fitton and Godard, 2004;Tejada et al, 2004), and depleted mantle (DM in B) is assumed as the Shatsky Rise mantle source (Sano et al, 2012;Heydolph et al, 2014). Tick marks in the curves correspond to degrees of partial melting in wt.%.…”

Section: -300mentioning

confidence: 99%

Results of Basement Drilling on Oceanic LIPs

Sano

2017

Jour. Geol. Soc. Japan

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In the first decade of the st century, two oceanic large igneous provinces (LIPs), the Ontong Java Plateau (OJP) and the Shatsky Rise, were drilled to recover basement lavas. Coring data show that basement rocks comprise massive sheet flows, similar to continental flood basalts. The high effusion rate to generate the massive sheet flows cannot be explained by normal plate tectonic processes. Because the two LIPs are considered to have formed at plate boundaries, previous workers have suggested that thermal plume heads underlie plate boundaries, generating voluminous magmas. Ar-Ar data show that the duration of LIP magmatism exceeds that of the predictive model for plumes. Minor volcanic episodes between and Ma occurred in the OJP, with the major event occurring at ~ Ma. For the Shatsky Rise, a ~ Myr hiatus separates the final massive flows from main volcanism. Petrological data suggest the temperature of the magma source (potential temperature) was ~ °C , higher than the ambient mantle of the OJP, ~ -°C higher than the Shatsky Rise, and lower than that of the plume model (> °C ). Geochemical data show that lavas from the two LIPs are variably enriched relative to normal upper mantle, suggesting they were derived from a plume source. However, unequivocal plume signatures (e.g., lower-mantle geochemical signatures with high He/ He) have not been identified in the volcanic products of the LIPs. Similarly, some lava compositions suggest the contribution of subducted slab materials to their magmatic source. Furthermore, the amount of subsidence following emplacement of the LIPs is less than that predicted by the thermal plume model. Thus, our study shows that a simple thermal plume model does not account for the genesis of the LIPs, indicating that more complex (e.g., thermochemical) models should be developed. Recent oceanic crust drilling programs have improved our understanding of LIP magmatism, but further work is required to constrain its characteristics and source.

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Missing western half of the Pacific Plate: Geochemical nature of the Izanagi‐Pacific Ridge interaction with a stationary boundary between the Indian and Pacific mantles

Miyazaki

Kimura

Senda

et al. 2015

Geochem Geophys Geosyst

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The source mantle of the basaltic ocean crust on the western half of the Pacific Plate was examined using Pb-Nd-Hf isotopes. The results showed that the subducted Izanagi-Pacific Ridge (IPR) formed from both Pacific (180-80 Ma) and Indian (80-70 Ma) mantles. The western Pacific Plate becomes younger westward and is thought to have formed from the IPR. The ridge was subducted along the KurileJapan-Nankai-Ryukyu (KJNR) Trench at 60-55 Ma and leading edge of the Pacific Plate is currently stagnated in the mantle transition zone. Conversely, the entire eastern half of the Pacific Plate, formed from isotopically distinct Pacific mantle along the East Pacific Rise and the Juan de Fuca Ridge, largely remains on the seafloor. The subducted IPR is inaccessible; therefore, questions regarding which mantle might be responsible for the formation of the western half of the Pacific Plate remain controversial. Knowing the source of the IPR basalts provides insight into the Indian-Pacific mantle boundary before the Cenozoic. Isotopic compositions of the basalts from borehole cores (165-130 Ma) in the western Pacific show that the surface oceanic crust is of Pacific mantle origin. However, the accreted ocean floor basalts in the accretionary prism along the KJNR Trench have Indian mantle signatures. This indicates the younger western Pacific Plate of IPR origin formed partly from Indian mantle and that the Indian-Pacific mantle boundary has been stationary in the western Pacific at least since the Cretaceous.

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Plume versus plate origin for the Shatsky Rise oceanic plateau (NW Pacific): Insights from Nd, Pb and Hf isotopes

Cited by 46 publications

References 96 publications

Formation and evolution of Shatsky Rise oceanic plateau: Insights from IODP Expedition 324 and recent geophysical cruises

Formation and evolution of Shatsky Rise oceanic plateau: Insights from IODP Expedition 324 and recent geophysical cruises

Results of Basement Drilling on Oceanic LIPs

Missing western half of the Pacific Plate: Geochemical nature of the Izanagi‐Pacific Ridge interaction with a stationary boundary between the Indian and Pacific mantles

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