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Modelling the hafnium-neodymium evolution of early Earth: a study from West Greenland

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DOI

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Modelling the hafnium-neodymium evolution of early Earth : a study from West Greenland. / Gardiner, Nicholas J.; Johnson, Tim E.; Kirkland, Christopher L.; Szilas, Kristoffer.

In: Journal of Petrology, Vol. 60, No. 1, 01.2019, p. 177-197.

Research output: Contribution to journalArticlepeer-review

Harvard

Gardiner, NJ, Johnson, TE, Kirkland, CL & Szilas, K 2019, 'Modelling the hafnium-neodymium evolution of early Earth: a study from West Greenland', Journal of Petrology, vol. 60, no. 1, pp. 177-197. https://doi.org/10.1093/petrology/egy110

APA

Gardiner, N. J., Johnson, T. E., Kirkland, C. L., & Szilas, K. (2019). Modelling the hafnium-neodymium evolution of early Earth: a study from West Greenland. Journal of Petrology, 60(1), 177-197. https://doi.org/10.1093/petrology/egy110

Vancouver

Gardiner NJ, Johnson TE, Kirkland CL, Szilas K. Modelling the hafnium-neodymium evolution of early Earth: a study from West Greenland. Journal of Petrology. 2019 Jan;60(1):177-197. https://doi.org/10.1093/petrology/egy110

Author

Gardiner, Nicholas J. ; Johnson, Tim E. ; Kirkland, Christopher L. ; Szilas, Kristoffer. / Modelling the hafnium-neodymium evolution of early Earth : a study from West Greenland. In: Journal of Petrology. 2019 ; Vol. 60, No. 1. pp. 177-197.

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@article{608afd873ee04dc3a0ca2cb9b4dcee18,
title = "Modelling the hafnium-neodymium evolution of early Earth: a study from West Greenland",
abstract = "The processes of partial melting and the segregation and migration of melt underpin the differentiation of the lithosphere. The Sm-Nd and Lu-Hf isotopic systems, which are sensitive to these processes, behave similarly during mantle-crust differentiation, leading to isotopically coupled primary (basaltic) and continental (tonalite-trondhjemite-granodiorite, TTG) crustal compositions that define a linear terrestrial fractionation array in eNd vs eHf space. However, Eoarchaean basalts and TTGs from West Greenland do not sit on this trend and are isotopically decoupled, which may reflect their extraction from a mantle with a non-chondritic composition. We explore the effects of source composition vs fractionation on the production and evolution of early Archaean crust. We use phase equilibria and trace element modelling to characterize the Hf-Nd isotopic evolution of a chain of melting from anhydrous mantle through hydrated basalt to TTG. We show that 20% decompression melting of anhydrous mantle with a superchondritic Sm/Nd but chondritic Lu/Hf composition at a mantle potential temperature appropriate to the early Archaean produces basaltic melts with an isotopic composition similar to those measured in Eoarchaean tholeiitic basalts from Isua, West Greenland. In turn, 5-30% melting of hydrated basalt produces TTG melts with Hf-Nd isotopic compositions similar to those measured in Eoarchaean TTGs from the Itsaq Gneiss Complex, West Greenland. Thus, we chart a chain of melting from an isotopically decoupled Hf-Nd mantle composition to isotopically decoupled mafic and felsic crust. Our modelling defines an overall Hf-Nd isotopic fractionation trend that is parallel to, but offset from, that defined by modern rocks with coupled compositions. Primitive mantle contamination by 5% recycled continental crust (TTG) requires a higher degree of mantle melting (30%) to produce basaltic melt with a Hf-Nd composition similar to the Isua basalts. A mantle composition with greater than 5% crustal contamination is more enriched than the Isua basalts, placing an upper limit on the amount of crustal contaminant. A non-chondritic mantle source composition in the early Archaean likely imposed a first order control on the subsequent production of crust with decoupled Hf-Nd compositions.",
keywords = "Archean Hadean, Hf Nd isotope, Itsaq Isua amphibolite, Mantle melting anatexis, TTG tonalite gneiss",
author = "Gardiner, {Nicholas J.} and Johnson, {Tim E.} and Kirkland, {Christopher L.} and Kristoffer Szilas",
note = "NJG acknowledges Curtin University and Australian Research Council grant FL160100168 for financial support. TEJ acknowledges additional support from the State Key Laboratory for Geological Processes and Mineral Resources, China University of Geosciences, Wuhan (Open Fund GPMR210704).",
year = "2019",
month = jan,
doi = "10.1093/petrology/egy110",
language = "English",
volume = "60",
pages = "177--197",
journal = "Journal of Petrology",
issn = "0022-3530",
publisher = "OXFORD UNIV PRESS",
number = "1",

}

RIS (suitable for import to EndNote) - Download

TY - JOUR

T1 - Modelling the hafnium-neodymium evolution of early Earth

T2 - a study from West Greenland

AU - Gardiner, Nicholas J.

AU - Johnson, Tim E.

AU - Kirkland, Christopher L.

AU - Szilas, Kristoffer

N1 - NJG acknowledges Curtin University and Australian Research Council grant FL160100168 for financial support. TEJ acknowledges additional support from the State Key Laboratory for Geological Processes and Mineral Resources, China University of Geosciences, Wuhan (Open Fund GPMR210704).

PY - 2019/1

Y1 - 2019/1

N2 - The processes of partial melting and the segregation and migration of melt underpin the differentiation of the lithosphere. The Sm-Nd and Lu-Hf isotopic systems, which are sensitive to these processes, behave similarly during mantle-crust differentiation, leading to isotopically coupled primary (basaltic) and continental (tonalite-trondhjemite-granodiorite, TTG) crustal compositions that define a linear terrestrial fractionation array in eNd vs eHf space. However, Eoarchaean basalts and TTGs from West Greenland do not sit on this trend and are isotopically decoupled, which may reflect their extraction from a mantle with a non-chondritic composition. We explore the effects of source composition vs fractionation on the production and evolution of early Archaean crust. We use phase equilibria and trace element modelling to characterize the Hf-Nd isotopic evolution of a chain of melting from anhydrous mantle through hydrated basalt to TTG. We show that 20% decompression melting of anhydrous mantle with a superchondritic Sm/Nd but chondritic Lu/Hf composition at a mantle potential temperature appropriate to the early Archaean produces basaltic melts with an isotopic composition similar to those measured in Eoarchaean tholeiitic basalts from Isua, West Greenland. In turn, 5-30% melting of hydrated basalt produces TTG melts with Hf-Nd isotopic compositions similar to those measured in Eoarchaean TTGs from the Itsaq Gneiss Complex, West Greenland. Thus, we chart a chain of melting from an isotopically decoupled Hf-Nd mantle composition to isotopically decoupled mafic and felsic crust. Our modelling defines an overall Hf-Nd isotopic fractionation trend that is parallel to, but offset from, that defined by modern rocks with coupled compositions. Primitive mantle contamination by 5% recycled continental crust (TTG) requires a higher degree of mantle melting (30%) to produce basaltic melt with a Hf-Nd composition similar to the Isua basalts. A mantle composition with greater than 5% crustal contamination is more enriched than the Isua basalts, placing an upper limit on the amount of crustal contaminant. A non-chondritic mantle source composition in the early Archaean likely imposed a first order control on the subsequent production of crust with decoupled Hf-Nd compositions.

AB - The processes of partial melting and the segregation and migration of melt underpin the differentiation of the lithosphere. The Sm-Nd and Lu-Hf isotopic systems, which are sensitive to these processes, behave similarly during mantle-crust differentiation, leading to isotopically coupled primary (basaltic) and continental (tonalite-trondhjemite-granodiorite, TTG) crustal compositions that define a linear terrestrial fractionation array in eNd vs eHf space. However, Eoarchaean basalts and TTGs from West Greenland do not sit on this trend and are isotopically decoupled, which may reflect their extraction from a mantle with a non-chondritic composition. We explore the effects of source composition vs fractionation on the production and evolution of early Archaean crust. We use phase equilibria and trace element modelling to characterize the Hf-Nd isotopic evolution of a chain of melting from anhydrous mantle through hydrated basalt to TTG. We show that 20% decompression melting of anhydrous mantle with a superchondritic Sm/Nd but chondritic Lu/Hf composition at a mantle potential temperature appropriate to the early Archaean produces basaltic melts with an isotopic composition similar to those measured in Eoarchaean tholeiitic basalts from Isua, West Greenland. In turn, 5-30% melting of hydrated basalt produces TTG melts with Hf-Nd isotopic compositions similar to those measured in Eoarchaean TTGs from the Itsaq Gneiss Complex, West Greenland. Thus, we chart a chain of melting from an isotopically decoupled Hf-Nd mantle composition to isotopically decoupled mafic and felsic crust. Our modelling defines an overall Hf-Nd isotopic fractionation trend that is parallel to, but offset from, that defined by modern rocks with coupled compositions. Primitive mantle contamination by 5% recycled continental crust (TTG) requires a higher degree of mantle melting (30%) to produce basaltic melt with a Hf-Nd composition similar to the Isua basalts. A mantle composition with greater than 5% crustal contamination is more enriched than the Isua basalts, placing an upper limit on the amount of crustal contaminant. A non-chondritic mantle source composition in the early Archaean likely imposed a first order control on the subsequent production of crust with decoupled Hf-Nd compositions.

KW - Archean Hadean

KW - Hf Nd isotope

KW - Itsaq Isua amphibolite

KW - Mantle melting anatexis

KW - TTG tonalite gneiss

U2 - 10.1093/petrology/egy110

DO - 10.1093/petrology/egy110

M3 - Article

AN - SCOPUS:85062108394

VL - 60

SP - 177

EP - 197

JO - Journal of Petrology

JF - Journal of Petrology

SN - 0022-3530

IS - 1

ER -

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