Excess hafnium-176 in meteorites and the early Earth zircon record

Research output: Contribution to journalJournal articlepeer-review

Standard

Excess hafnium-176 in meteorites and the early Earth zircon record. / Bizzarro, Martin; Connelly, James; Thrane, Kristine; Borg, Lars E.

In: Geochemistry, Geophysics, Geosystems, Vol. 13, No. 3, Q03002, 01.03.2012.

Research output: Contribution to journalJournal articlepeer-review

Harvard

Bizzarro, M, Connelly, J, Thrane, K & Borg, LE 2012, 'Excess hafnium-176 in meteorites and the early Earth zircon record', Geochemistry, Geophysics, Geosystems, vol. 13, no. 3, Q03002. https://doi.org/10.1029/2011GC004003

APA

Bizzarro, M., Connelly, J., Thrane, K., & Borg, L. E. (2012). Excess hafnium-176 in meteorites and the early Earth zircon record. Geochemistry, Geophysics, Geosystems, 13(3), [Q03002]. https://doi.org/10.1029/2011GC004003

Vancouver

Bizzarro M, Connelly J, Thrane K, Borg LE. Excess hafnium-176 in meteorites and the early Earth zircon record. Geochemistry, Geophysics, Geosystems. 2012 Mar 1;13(3). Q03002. https://doi.org/10.1029/2011GC004003

Author

Bizzarro, Martin ; Connelly, James ; Thrane, Kristine ; Borg, Lars E. / Excess hafnium-176 in meteorites and the early Earth zircon record. In: Geochemistry, Geophysics, Geosystems. 2012 ; Vol. 13, No. 3.

Bibtex

@article{d48dacc879914ceaa622cfcffc340137,
title = "Excess hafnium-176 in meteorites and the early Earth zircon record",
abstract = "The long-lived Lu-to- Hf decay system is a powerful tool to understand ancient chemical fractionation events associated with planetary differentiation. Detrital Hadean zircons (>3.8 Gyr) from the Jack Hills metasedimentary belt of Western Australia record extremely enriched Hf-isotope signals suggesting early extraction of a continental crust (>4.5 Gyr) but fail to identify a prevalent complementary depleted mantle reservoir, suggesting that crust formation processes in the early Earth were fundamentally distinct from today. However, this conclusion assumes that the Hf-isotope composition of bulk chondrite meteorites can be used to estimate the composition of Earth prior to its differentiation into major silicate reservoirs, namely the bulk silicate Earth (BSE). We report a Lu- Hf internal mineral isochron age of 4869 34 Myr for the pristine SAH99555 angrite meteorite. This age is ~300 Myr older than the age of the Solar System, confirming the existence of an energetic process yielding excess Hf in affected early formed Solar System objects through the production of the Lu isomer (t ~3.9 hours). Thus, chondrite meteorites contain excess Hf and their present-day composition cannot be used to infer the Lu-Hf parameters of BSE. Using a revised BSE estimate based on the SAH99555 isochron, we show that Earth's oldest zircons preserve a record of coexisting enriched and depleted hafnium reservoirs as early as ~4.3 Gyr in Earth's history, with little evidence for the existence of continental crust prior to ~4.4 Gyr. This new view suggests continuous juvenile crustal growth and recycling throughout the Hadean and Archean eras, perhaps analogous to modern plate tectonics.",
author = "Martin Bizzarro and James Connelly and Kristine Thrane and Borg, {Lars E.}",
year = "2012",
month = mar,
day = "1",
doi = "10.1029/2011GC004003",
language = "English",
volume = "13",
journal = "Geochemistry, Geophysics, Geosystems",
issn = "1525-2027",
publisher = "AGU Publications",
number = "3",

}

RIS

TY - JOUR

T1 - Excess hafnium-176 in meteorites and the early Earth zircon record

AU - Bizzarro, Martin

AU - Connelly, James

AU - Thrane, Kristine

AU - Borg, Lars E.

PY - 2012/3/1

Y1 - 2012/3/1

N2 - The long-lived Lu-to- Hf decay system is a powerful tool to understand ancient chemical fractionation events associated with planetary differentiation. Detrital Hadean zircons (>3.8 Gyr) from the Jack Hills metasedimentary belt of Western Australia record extremely enriched Hf-isotope signals suggesting early extraction of a continental crust (>4.5 Gyr) but fail to identify a prevalent complementary depleted mantle reservoir, suggesting that crust formation processes in the early Earth were fundamentally distinct from today. However, this conclusion assumes that the Hf-isotope composition of bulk chondrite meteorites can be used to estimate the composition of Earth prior to its differentiation into major silicate reservoirs, namely the bulk silicate Earth (BSE). We report a Lu- Hf internal mineral isochron age of 4869 34 Myr for the pristine SAH99555 angrite meteorite. This age is ~300 Myr older than the age of the Solar System, confirming the existence of an energetic process yielding excess Hf in affected early formed Solar System objects through the production of the Lu isomer (t ~3.9 hours). Thus, chondrite meteorites contain excess Hf and their present-day composition cannot be used to infer the Lu-Hf parameters of BSE. Using a revised BSE estimate based on the SAH99555 isochron, we show that Earth's oldest zircons preserve a record of coexisting enriched and depleted hafnium reservoirs as early as ~4.3 Gyr in Earth's history, with little evidence for the existence of continental crust prior to ~4.4 Gyr. This new view suggests continuous juvenile crustal growth and recycling throughout the Hadean and Archean eras, perhaps analogous to modern plate tectonics.

AB - The long-lived Lu-to- Hf decay system is a powerful tool to understand ancient chemical fractionation events associated with planetary differentiation. Detrital Hadean zircons (>3.8 Gyr) from the Jack Hills metasedimentary belt of Western Australia record extremely enriched Hf-isotope signals suggesting early extraction of a continental crust (>4.5 Gyr) but fail to identify a prevalent complementary depleted mantle reservoir, suggesting that crust formation processes in the early Earth were fundamentally distinct from today. However, this conclusion assumes that the Hf-isotope composition of bulk chondrite meteorites can be used to estimate the composition of Earth prior to its differentiation into major silicate reservoirs, namely the bulk silicate Earth (BSE). We report a Lu- Hf internal mineral isochron age of 4869 34 Myr for the pristine SAH99555 angrite meteorite. This age is ~300 Myr older than the age of the Solar System, confirming the existence of an energetic process yielding excess Hf in affected early formed Solar System objects through the production of the Lu isomer (t ~3.9 hours). Thus, chondrite meteorites contain excess Hf and their present-day composition cannot be used to infer the Lu-Hf parameters of BSE. Using a revised BSE estimate based on the SAH99555 isochron, we show that Earth's oldest zircons preserve a record of coexisting enriched and depleted hafnium reservoirs as early as ~4.3 Gyr in Earth's history, with little evidence for the existence of continental crust prior to ~4.4 Gyr. This new view suggests continuous juvenile crustal growth and recycling throughout the Hadean and Archean eras, perhaps analogous to modern plate tectonics.

UR - http://www.scopus.com/inward/record.url?scp=84858013818&partnerID=8YFLogxK

U2 - 10.1029/2011GC004003

DO - 10.1029/2011GC004003

M3 - Journal article

AN - SCOPUS:84858013818

VL - 13

JO - Geochemistry, Geophysics, Geosystems

JF - Geochemistry, Geophysics, Geosystems

SN - 1525-2027

IS - 3

M1 - Q03002

ER -

ID: 45193013