Probing the Earth’s Deep Interior Through Geochemistry

White, William M.

doi:10.7185/geochempersp.4.2

Cited by 97 publications

(57 citation statements)

References 432 publications

(679 reference statements)

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“…NWHR and Hawaiian Island basalts form negative correlations in epsilon Nd and epsilon Hf versus 87 Sr/ 86 Sr plots and positive correlations between Hf and Nd isotopes, which is typical for oceanic basalts (White, 2015) (Figure 7). Most NWHR basalts overlap with Mauna Kea, West Maui, Hana Ridge, and Kīlauea isotopic compositions near the Kea end-member side of the Hawaiian arrays (Figures 7 and 8).…”

Section: Nd-sr-hf Isotopic Compositionsmentioning

confidence: 85%

The Size and Emergence of Geochemical Heterogeneities in the Hawaiian Mantle Plume Constrained by Sr‐Nd‐Hf Isotopic Variation Over ∼47 Million Years

Harrison

Weis

2018

Geochem Geophys Geosyst

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The Hawaiian‐Emperor chain is the ∼6,000 km long surface expression of the deeply sourced Hawaiian mantle plume active over the past ∼81 Myr. The Hawaiian Islands (<∼6.5 Ma) present two geographically and geochemically distinct trends, Kea and Loa, while the Emperor Seamounts (>81–47 Ma) show only Kea compositions. New Sr‐Nd‐Hf isotope, trace and major element data of 23 Northwest Hawaiian Ridge (∼47–6.5 Ma) shield‐stage tholeiitic basalts analyzed in this study fill a critical gap and show both Kea and Loa compositions. A logistic regression model fit to a high‐quality isotopic database of Hawaiian Island basalts is used to predict Loa‐type or Kea‐type affinity of new NWHR isotope analyses. Daikakuji, Mokumanamana, West Nīhoa, Nīhoa, and Middle Bank erupt Loa‐type compositions, a finding corroborated by their geochemical characteristics (e.g., low Th/La, CaO/Al2O3, and high Sr/Nb, Zr/Nb, SiO2). Participation of the Loa composition gradually increases toward the Hawaiian Islands with time and there is no evidence for the presence of the Lō‘ihi component along the NWHR or before ∼1 Myr. A new Hf‐Nd Hawaiian array is calculated based on an up‐to‐date extended Hawaiian Island basalt database (n = 403). The NWHR array is slightly steeper than the Hawaiian array, suggesting minimal participation of the high Hf isotopic source component present in Hawaiian Island volcanoes before ∼6.5 Ma. This study fills a significant geochemical data gap in the Hawaiian‐Emperor seamount chain, and shows that Hawaiian plume chemistry evolves significantly with time as the plume samples different deep mantle reservoirs.

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Section: Nd-sr-hf Isotopic Compositionsmentioning

confidence: 85%

The Size and Emergence of Geochemical Heterogeneities in the Hawaiian Mantle Plume Constrained by Sr‐Nd‐Hf Isotopic Variation Over ∼47 Million Years

Harrison

Weis

2018

Geochem Geophys Geosyst

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“…Geochemical research has unequivocally demonstrated through major, trace and long-lived radiogenic isotopes that intraplate and subduction-related volcanism taps a chemically heterogeneous mantle (e.g., Arculus and Powell 1986;Ellam and Hawkesworth, 1988;Hofmann, 1997;Hofmann and White, 1982;Jackson and Dasgupta, 2008;Stracke et al 2005;White, 2015;Weaver, 1991;Zindler and Hart, 1986). For example, the addition of sediment, sediment melts, metasomatically enriched mantle, recycled oceanic crust and fluids derived thereof have all been invoked to explain chemical heterogeneity in basaltic lavas.…”

Section: Introductionmentioning

confidence: 99%

Thallium elemental behavior and stable isotope fractionation during magmatic processes

et al. 2017

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Please cite this article as: Prytulak, J., Brett, A., Webb, M., Plank, T., Rehkämper, M., Savage, P.S., Woodhead, J., Thallium elemental behavior and stable isotope fractionation during magmatic processes, Chemical Geology (2016), doi: 10.1016/j.chemgeo. 2016.11.007 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT AbstractStable thallium (Tl) isotopes are an extremely sensitive tracer for the addition of small amounts of sediments or materials altered at low temperatures to the source(s) of mantle-derived melts. The ability of Tl to trace such materials is due to the large concentration contrast between the mantle (Tl < 2ng/g) and possible exotic inputs (Tl ~100ng/g to >g/g), which also often display fractionated Tl isotope compositions.However, the magnitude of Tl isotope fractionation induced by igneous processes alone has not been systematically assessed. Here, two suites of co-genetic magmas, spanning a large range of differentiation, from Hekla, Iceland, and Anatahan, in the Mariana arc, are used to assess the behavior of thallium and its stable isotope variations during magmatic processes. Thallium behaves as a near-perfectly incompatible lithophile element throughout magmatic evolution, mirroring elements such as Rb, Cs, and K. Lavas from Hekla have restricted Cs/Tl ratios and stable Tl isotope compositions, which overlap with mantle estimates. Lavas from subductionrelated Anatahan volcano also have a restricted range in Tl isotope composition, which overlaps with Hekla and MORB, demonstrating that fractional crystallisation and partial melting does not fractionate stable Tl isotopes. Subduction environments display variable Cs/Tl, indicating that the subduction process commonly fractionates these two elements. The immunity of thallium stable isotopes to fractionation by magmatic processes coupled with its extreme sensitivity for tracing pelagic sediments, FeMn crusts and low temperature altered oceanic crust highlight its value in elucidating the nature of mantle sources of both oceanic basalts and arc lavas.Critically, meaningful interpretation of thallium isotope compositions need not be restricted to primitive lavas.

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“…It is challenging to quantitatively explain the origin of CC and enriched mantle components by a unified process [White, 2015a]. Even using just ABS4 and OCR1, there are many variables that could be adjusted to improve the fit between the composition or age of subduction residues and the mantle sources of specific OIB suites.…”

Section: Formation Of the Solid Earth's Chemical Componentsmentioning

confidence: 99%

“…Although FOZO/C appears to be ubiquitous in plumes, it is neither uniform nor primitive. Instead, it is mostly a mixture of residual slab components stored in the mantle [Koppers et al, 2011;Stracke, 2012;Stracke et al, 2005;White, 2015b]. Both the residues and storage times differ between hemispheres.…”

Section: The Edr and C Or Fozomentioning

confidence: 99%

Origin of geochemical mantle components: Role of subduction filter

Kimura

Gill

Skora

et al. 2016

Geochem Geophys Geosyst

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We quantitatively explore element redistribution at subduction zones using numerical mass balance models to evaluate the roles of the subduction zone filter in the Earth's geochemical cycle. Our models of slab residues after arc magma genesis differ from previous ones by being internally consistent with geodynamic models of modern arcs that successfully explain arc magma genesis and include element fluxes from the dehydration/melting of each underlying slab component. We assume that the mantle potential temperature

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Probing the Earth’s Deep Interior Through Geochemistry

Cited by 97 publications

References 432 publications

The Size and Emergence of Geochemical Heterogeneities in the Hawaiian Mantle Plume Constrained by Sr‐Nd‐Hf Isotopic Variation Over ∼47 Million Years

The Size and Emergence of Geochemical Heterogeneities in the Hawaiian Mantle Plume Constrained by Sr‐Nd‐Hf Isotopic Variation Over ∼47 Million Years

Thallium elemental behavior and stable isotope fractionation during magmatic processes

Origin of geochemical mantle components: Role of subduction filter

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