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Melting controls on the lutetium–hafnium evolution of Archaean crust

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Melting controls on the lutetium–hafnium evolution of Archaean crust. / Gardiner, Nicholas J.; Johnson, Tim E.; Kirkland, Christopher L.; Smithies, R. Hugh.

In: Precambrian Research, Vol. 305, 02.2018, p. 479-488.

Research output: Contribution to journalArticlepeer-review

Harvard

Gardiner, NJ, Johnson, TE, Kirkland, CL & Smithies, RH 2018, 'Melting controls on the lutetium–hafnium evolution of Archaean crust', Precambrian Research, vol. 305, pp. 479-488. https://doi.org/10.1016/j.precamres.2017.12.026

APA

Gardiner, N. J., Johnson, T. E., Kirkland, C. L., & Smithies, R. H. (2018). Melting controls on the lutetium–hafnium evolution of Archaean crust. Precambrian Research, 305, 479-488. https://doi.org/10.1016/j.precamres.2017.12.026

Vancouver

Gardiner NJ, Johnson TE, Kirkland CL, Smithies RH. Melting controls on the lutetium–hafnium evolution of Archaean crust. Precambrian Research. 2018 Feb;305:479-488. https://doi.org/10.1016/j.precamres.2017.12.026

Author

Gardiner, Nicholas J. ; Johnson, Tim E. ; Kirkland, Christopher L. ; Smithies, R. Hugh. / Melting controls on the lutetium–hafnium evolution of Archaean crust. In: Precambrian Research. 2018 ; Vol. 305. pp. 479-488.

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@article{c395e83b58a14db6b093032b684d3a3a,
title = "Melting controls on the lutetium–hafnium evolution of Archaean crust",
abstract = "The lutetium–hafnium (Lu–Hf) isotope record, typically measured in zircon crystals, provides a major tool for the study of crustal growth and differentiation. Interpretations of Hf isotope datasets use an evolution array defined by source 176Lu/177Hf. However, the very process that drives crustal differentiation to produce such arrays – partial melting – is precisely that which may modify the trajectory of the array due to variable degrees of anatexis allied with the differing compatibilities of Lu and Hf in residual minerals. Further, Lu/Hf estimates derived from the composition of present-day continental crust may be inappropriate for modelling Archaean crustal evolution, where different geodynamic styles and magmatic sources prevailed. Using an approach combining phase equilibria, and trace element and isotopic modelling, we quantify the effects of partial melting of both a modern (N-MORB) and Archaean (C-F2) mafic source on melt Lu/Hf. Melting N-MORB shows that the 176Lu/177Hf of the melt, which modelling predicts to be between 0.015 and 0.022, is sensitive to the degree of melting. This difference results in a variation of 4.5 epsilon units/billion years. By contrast, anatexis of C-F2 yields melts with 176Lu/177Hf ∼0.009 that are less affected by the degree of melting. Remelting TTG yields K-rich granitic melts (TTG + G) with 176Lu/177Hf ∼0.005. Thus, a partial melting event imposes a greater control on the resulting crustal reservoir Lu/Hf than the degree of melting. Archaean continental crust has a lower Lu/Hf than that of the average mid to upper continental crust, and therefore a lower 176Lu/177Hf (here 0.005–0.009) is appropriate to modelling its Hf isotopic evolution. There has been a secular change in average crustal Lu/Hf, with the median Lu/Hf of Proterozoic and Phanerozoic magmatic rocks being higher than that of Archaean TTG + G. We show that an enriched Archaean mafic source (C-F2) with a Lu/Hf ratio of ∼0.12 may produce TTG continental crust with a 176Lu/177Hf approaching that calculated in real rocks worldwide.",
keywords = "Archaean, Continental crust, Crustal evolution, Lu/Hf isotopes, Partial melting anatexis, TTG",
author = "Gardiner, {Nicholas J.} and Johnson, {Tim E.} and Kirkland, {Christopher L.} and Smithies, {R. Hugh}",
note = "NJG, TEJ and CLK acknowledges Curtin University for financial support.",
year = "2018",
month = feb,
doi = "10.1016/j.precamres.2017.12.026",
language = "English",
volume = "305",
pages = "479--488",
journal = "Precambrian Research",
issn = "0301-9268",
publisher = "Elsevier Science BV",

}

RIS (suitable for import to EndNote) - Download

TY - JOUR

T1 - Melting controls on the lutetium–hafnium evolution of Archaean crust

AU - Gardiner, Nicholas J.

AU - Johnson, Tim E.

AU - Kirkland, Christopher L.

AU - Smithies, R. Hugh

N1 - NJG, TEJ and CLK acknowledges Curtin University for financial support.

PY - 2018/2

Y1 - 2018/2

N2 - The lutetium–hafnium (Lu–Hf) isotope record, typically measured in zircon crystals, provides a major tool for the study of crustal growth and differentiation. Interpretations of Hf isotope datasets use an evolution array defined by source 176Lu/177Hf. However, the very process that drives crustal differentiation to produce such arrays – partial melting – is precisely that which may modify the trajectory of the array due to variable degrees of anatexis allied with the differing compatibilities of Lu and Hf in residual minerals. Further, Lu/Hf estimates derived from the composition of present-day continental crust may be inappropriate for modelling Archaean crustal evolution, where different geodynamic styles and magmatic sources prevailed. Using an approach combining phase equilibria, and trace element and isotopic modelling, we quantify the effects of partial melting of both a modern (N-MORB) and Archaean (C-F2) mafic source on melt Lu/Hf. Melting N-MORB shows that the 176Lu/177Hf of the melt, which modelling predicts to be between 0.015 and 0.022, is sensitive to the degree of melting. This difference results in a variation of 4.5 epsilon units/billion years. By contrast, anatexis of C-F2 yields melts with 176Lu/177Hf ∼0.009 that are less affected by the degree of melting. Remelting TTG yields K-rich granitic melts (TTG + G) with 176Lu/177Hf ∼0.005. Thus, a partial melting event imposes a greater control on the resulting crustal reservoir Lu/Hf than the degree of melting. Archaean continental crust has a lower Lu/Hf than that of the average mid to upper continental crust, and therefore a lower 176Lu/177Hf (here 0.005–0.009) is appropriate to modelling its Hf isotopic evolution. There has been a secular change in average crustal Lu/Hf, with the median Lu/Hf of Proterozoic and Phanerozoic magmatic rocks being higher than that of Archaean TTG + G. We show that an enriched Archaean mafic source (C-F2) with a Lu/Hf ratio of ∼0.12 may produce TTG continental crust with a 176Lu/177Hf approaching that calculated in real rocks worldwide.

AB - The lutetium–hafnium (Lu–Hf) isotope record, typically measured in zircon crystals, provides a major tool for the study of crustal growth and differentiation. Interpretations of Hf isotope datasets use an evolution array defined by source 176Lu/177Hf. However, the very process that drives crustal differentiation to produce such arrays – partial melting – is precisely that which may modify the trajectory of the array due to variable degrees of anatexis allied with the differing compatibilities of Lu and Hf in residual minerals. Further, Lu/Hf estimates derived from the composition of present-day continental crust may be inappropriate for modelling Archaean crustal evolution, where different geodynamic styles and magmatic sources prevailed. Using an approach combining phase equilibria, and trace element and isotopic modelling, we quantify the effects of partial melting of both a modern (N-MORB) and Archaean (C-F2) mafic source on melt Lu/Hf. Melting N-MORB shows that the 176Lu/177Hf of the melt, which modelling predicts to be between 0.015 and 0.022, is sensitive to the degree of melting. This difference results in a variation of 4.5 epsilon units/billion years. By contrast, anatexis of C-F2 yields melts with 176Lu/177Hf ∼0.009 that are less affected by the degree of melting. Remelting TTG yields K-rich granitic melts (TTG + G) with 176Lu/177Hf ∼0.005. Thus, a partial melting event imposes a greater control on the resulting crustal reservoir Lu/Hf than the degree of melting. Archaean continental crust has a lower Lu/Hf than that of the average mid to upper continental crust, and therefore a lower 176Lu/177Hf (here 0.005–0.009) is appropriate to modelling its Hf isotopic evolution. There has been a secular change in average crustal Lu/Hf, with the median Lu/Hf of Proterozoic and Phanerozoic magmatic rocks being higher than that of Archaean TTG + G. We show that an enriched Archaean mafic source (C-F2) with a Lu/Hf ratio of ∼0.12 may produce TTG continental crust with a 176Lu/177Hf approaching that calculated in real rocks worldwide.

KW - Archaean

KW - Continental crust

KW - Crustal evolution

KW - Lu/Hf isotopes

KW - Partial melting anatexis

KW - TTG

U2 - 10.1016/j.precamres.2017.12.026

DO - 10.1016/j.precamres.2017.12.026

M3 - Article

AN - SCOPUS:85040566361

VL - 305

SP - 479

EP - 488

JO - Precambrian Research

JF - Precambrian Research

SN - 0301-9268

ER -

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