Parallels in the origin of the geochemical signatures of island arc volcanics and continental potassic igneous rocks: The role of residual titanates

Foley, Stephen F.; Wheller, G.E.

doi:10.1016/0009-2541(90)90120-v

Cited by 203 publications

(54 citation statements)

References 44 publications

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“…It is now established on the grounds of experimental solubility measurements of rutile (Green and Pearson, 1986;Ryerson and Watson, 1987) and also from geochemical studies of island arc volcanics (Woodhead et al, 1993;Thirlwall et al, 1994), that rutile cannot coexist with basaltic melts arising from partial melting of peridotite in the mantle wedge. It may, however, be present during melting of the subducting oceanic crust (Ringwood, 1990) or of non-peridotitic parts of the mantle wedge (Foley and Wheller, 1990). The second hypothesis appeals to fluid loss by dehydration reactions in the subducting plate: this is consistent with thermal models for subduction zones which suggest that the melting points of subducted materials are not usually attained at relevant depths (Peacock, 1996;Poli and Schmidt, 1995).…”

Section: Introductionmentioning

confidence: 73%

“…Whereas high TiO 2 solubility in basaltic melts eliminates the possibility of titanate minerals as equilibrium phases in mantle peridotite, the possibility remains that they are present in pyroxene-rich veins in the mantle which originate by the influx of melts or fluids and their reaction with peridotite (Foley and Wheller, 1990;Ringwood, 1990). Titanate minerals may be stable in these circumstances.…”

mentioning

confidence: 99%

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Rutile/melt partition coefficients for trace elements and an assessment of the influence of rutile on the trace element characteristics of subduction zone magmas

Foley

Barth

Jenner

2000

Geochimica et Cosmochimica Acta

540

175

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Abstract-Fractionation of some or all of the high field strength elements (HFSE) Nb, Ta, Zr, Hf, and Ti relative to other trace elements occurs in igneous rocks from convergent margins and in the average continental crust, and is generally attributed to a process occurring during subduction. The experimental partitioning of an extensive array of trace elements between rutile/melt pairs is presented which enables the effect of rutile during melting in subduction zones to be directly assessed. D Nb and D Ta are in the range 100 -500, D Zr and D Hf are about 5, whereas all other trace elements analyzed have D rutile/melt less than 0.1. Published D patterns for Nb and Ta between rutile and water-rich fluids are similar to those for melt, whereas the values for Zr and Hf are significantly higher. D Nb and D Ta values for clinopyroxene and garnet are much lower than for rutile, and cannot cause the fractionation of HFSE from other elements seen in island arcs. The presence of rutile in the subducted slab residue during dehydration may be essential in the production of the geochemical signatures of arc magmas, whereas that of the continental crust, including higher Zr/Sm, may be produced by melting of eclogite.

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Section: Introductionmentioning

confidence: 73%

mentioning

confidence: 99%

Rutile/melt partition coefficients for trace elements and an assessment of the influence of rutile on the trace element characteristics of subduction zone magmas

Foley

Barth

Jenner

2000

Geochimica et Cosmochimica Acta

540

175

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show abstract

“…Both rutile and titanite have high partition coefficients for Nb, Ta, and Ti (Green, 1994;Foley et al, 2000;Green et al, 2000). Therefore, these phases retain HFSEs if they are present in the residue during partial melting, leading to strong depletion in these elements in the resultant magmas (Foley and Wheller, 1990;Sheppard and Taylor, 1992;Pearce and Parkinson, 1993;Pearce and Peate, 1994). Nb has a higher partition coefficient (136) than Ta (16.6) in rutile, whereas titanite shows the opposite (D Ta = 142, D Nb = 4.6; Guo et al, 2006).…”

Section: Ti-bearing Mineralmentioning

confidence: 99%

Cenozoic Mg-rich potassic rocks in the Tibetan Plateau: Geochemical variations, heterogeneity of subcontinental lithospheric mantle and tectonic implications

Chen

Wang

et al. 2012

Journal of Asian Earth Sciences

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“…Furthermore, quantitative comparison of the trace elements in granite through granodiorite, diorite, and gabbro exhibits considerable LILE enrichment (Ba, K, Rb, and Th) and HFSE depletion (Hf, Ti) relative to MORB; in addition, we identify the higher LREE enrichment than HREE relative to chondrite (Figures 10 and 11). Magmas with these geochemical characteristics are generally ascribed to subduction-related environments (e.g., Rogers and Hawkesworth, 1989;Foley and Wheeler, 1990;Sajona et al, 1996). High Th/Yb ratios are also correlated with continental arc magmas (Figure 15) (Condie, 1989).…”

Section: Petrogenetic Considerations and Origin Of The Parent Magmasmentioning

confidence: 99%

Geochemistry, zircon U-Pb age, and tectonic constraints on the Bazman granitoid complex, southeast Iran

Boomeri¹,

Bagheri²,

Ishiyama³

et al. 2016

Turkish J Earth Sci

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The Bazman granitoid complex (BGC), including a large zoned pluton, intrudes into the upper Paleozoic sedimentary cover of the Lut block. It crops out on the southern slope of the Bazman volcano in Baluchestan Province of Iran. The intrusive rocks range from gabbro to various metaluminous to weakly peraluminous granites, and they are classified as I-type magmatic series. They display geochemical characteristics of typical volcanic arc magmatism at continental margins. Major-and trace-element variation diagrams show that fractional crystallization was the major process and crustal contamination, a subordinate process during the evolution of the BGC. The decrease in CaO, MgO, Al 2 O 3 , Fe 2 O 3 , TiO 2 , P 2 O 5 , and Sr, as well as the increase of K 2 O and Rb with increasing silica, are possibly related to the fractionation of plagioclase, hornblende, apatite, and titanite, whereas the increasing K, Rb, Cs, Pb, and light rare earth elements (LREEs) can be explained by crustal contamination. The BGC rocks are enriched by large ion lithophile elements (e.g., Rb, K, Cs) and the LREEs with respect to the high field strength elements (e.g., Zr, Hf, Nb, Ta, Y) and heavy rare earth elements. New ID-TIMS U-Pb dating performed on zircon and titanite extracted from the granitic samples indicates that the BGC was emplaced during the late Cretaceous period at 83-72 Ma by subduction of the Neo-Tethyan oceanic crust beneath the Eurasian continent. Subsequently, the complex became part of the Lut block when it probably rotated counter-clockwise with respect to the Sanandaj-Sirjan zone and the Urumieh-Dokhtar volcano-plutonic belt.

show abstract

Parallels in the origin of the geochemical signatures of island arc volcanics and continental potassic igneous rocks: The role of residual titanates

Cited by 203 publications

References 44 publications

Rutile/melt partition coefficients for trace elements and an assessment of the influence of rutile on the trace element characteristics of subduction zone magmas

Rutile/melt partition coefficients for trace elements and an assessment of the influence of rutile on the trace element characteristics of subduction zone magmas

Cenozoic Mg-rich potassic rocks in the Tibetan Plateau: Geochemical variations, heterogeneity of subcontinental lithospheric mantle and tectonic implications

Geochemistry, zircon U-Pb age, and tectonic constraints on the Bazman granitoid complex, southeast Iran

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