Molybdenum and titanium isotopic signatures of arc-derived cumulates

Storck, Julian-Christopher; Greber, Nicolas D.; Duarte, Joana Filipa Vieira; Lanari, Pierre; Tiepolo, Massimo; Pettke, Thomas

doi:10.1016/j.chemgeo.2022.121260

Cited by 8 publications

(14 citation statements)

References 110 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“… Titanium isotope composition (δ 49 Ti) of analyzed samples relative to SiO 2 (Fonseca et al., 2017; Hohl et al., 2022; Kirchenbaur & Münker, 2015; Kirchenbaur et al., 2022; König et al., 2008, 2010; Kurzweil et al., 2019; Schuth et al., 2009), compared to previous studies (Deng et al., 2019; Greber et al., 2017; Millet et al., 2016; Storck et al., 2023). …”

Section: Resultsmentioning

confidence: 77%

“…Storck et al. (2023) studied arc‐related cumulates with distinctly light Ti isotope compositions, complementary to observed heavier isotope compositions in evolved magmas. Studying the effect of possible mantle heterogeneity or source depletion would thus require primitive samples as well as genetically related samples that originate from a more depleted source.…”

Section: Introductionmentioning

confidence: 95%

“…The observed dichotomy of Ti isotope compositions and SiO 2 content in subduction‐related rock suites and Ocean Island Basalts (OIB) is thus the result of a complex function of Ti coordination chemistry, redox state (influencing other mineral stabilities), melt structure, water content, and crystallizing mineral modes (Aarons et al., 2021; Deng et al., 2019; Hoare et al., 2020, 2022; Prytulak & Elliott, 2007): The typical coordination of Ti in silicate melts is on average V‐fold (Farges, Brown, & Rehr, 1996; Farges et al., 1996a, 1996b; Leitzke et al., 2016). Fractional crystallization of most silicate phases such as olivine, ortho‐ and clinopyroxene, as well as garnet, is thought to only marginally affect the Ti isotope composition of differentiating silicate melts (Johnson et al., 2019; Millet et al., 2016; Storck et al., 2023; Wang et al., 2020). Recent studies, however, observed preferential incorporation of lighter Ti isotopes in silicates such as titanite and amphibole (He et al., 2020; Mandl, 2019; Storck et al., 2023).…”

Section: Introductionmentioning

confidence: 99%

“…Fractional crystallization of most silicate phases such as olivine, ortho‐ and clinopyroxene, as well as garnet, is thought to only marginally affect the Ti isotope composition of differentiating silicate melts (Johnson et al., 2019; Millet et al., 2016; Storck et al., 2023; Wang et al., 2020). Recent studies, however, observed preferential incorporation of lighter Ti isotopes in silicates such as titanite and amphibole (He et al., 2020; Mandl, 2019; Storck et al., 2023). Additionally, Mandl (2019) found that biotite mineral separates to are isotopically lighter than their bulk rock they were separated from, whereas Nie et al.…”

Section: Introductionmentioning

confidence: 99%

“…(2021) and Storck et al. (2023) only acknowledge that amphibole has at least a part in influencing the Ti isotope budget without any quantification of that effect. Therefore, to study the effect of fractional crystallization of these minerals on the Ti isotopic composition, the required samples need to originate from a (relatively) closed magmatic system, where fractional crystallization of Ti oxides and amphibole has been observed.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Mineralogical Controls on the Ti Isotope Composition of Subduction Zone Magmas

Kommescher,

Kurzweil,

Fonseca

et al. 2023

Geochem Geophys Geosyst

View full text Add to dashboard Cite

The positive Ti isotope versus SiO2‐content correlation in igneous rocks reflects the fractional crystallization of Ti‐bearing oxide minerals. However, Ti isotope variations of subduction‐related igneous rocks indicate that the Ti isotope compositions of their mantle sources are heterogeneous and additional mineral phases may promote Ti isotope fractionation. We have determined the Ti isotope composition of well‐characterized subduction‐related basalts, andesites and boninites. Samples from the Solomon Islands, the Troodos ophiolite in Cyprus, and Cape Vogel in Papua New Guinea show small but resolvable variations that may be related to differences in their mantle sources. Specifically, the δ49Ti of boninites (+0.109‰ to +0.168‰) is slightly higher than that of tholeiites (−0.027‰ to +0.111‰) from the same localities (Troodos in Cyprus and Cape Vogel in Papua New Guinea). Modeling suggests the partial melting of progressively depleted mantle sources where residual Cr‐spinel plays a greater role in controlling the Ti budget during partial melting. More pronounced variations in δ49Ti are clearly linked to the fractional crystallization of Ti‐oxides: Samples from Rabaul Volcanic Complex (New Britain, Papua New Guinea) show increasing δ49Ti (up to +0.373‰) with increasing Ti/V and decreasing Dy/Yb. Fractional crystallization models suggest that oxide minerals and amphibole are needed to sufficiently increase the δ49Ti of these magmas. Our study highlights that the combination of diagnostic trace element patterns and Ti isotope compositions in subduction‐related igneous rocks can be a powerful tool to constrain petrogenetic processes and to discriminate between different crystallizing mineral phases.

show abstract