Hadean geodynamics inferred from time-varying 142Nd/144Nd in the early Earth rock record

Research output: Contribution to journal › Journal article › Research › peer-review

Standard

Hadean geodynamics inferred from time-varying 142Nd/144Nd in the early Earth rock record. / Saji, N.s.; Larsen, K.; Wielandt, D.; Schiller, M.; Costa, M.m.; Whitehouse, M.j.; Rosing, M.t.; Bizzarro, M.

In: Geochemical Perspectives Letters, Vol. 7, 2018, p. 43-48.

Research output: Contribution to journal › Journal article › Research › peer-review

Harvard

Saji, NS, Larsen, K, Wielandt, D, Schiller, M, Costa, MM, Whitehouse, MJ, Rosing, MT & Bizzarro, M 2018, 'Hadean geodynamics inferred from time-varying 142Nd/144Nd in the early Earth rock record', Geochemical Perspectives Letters, vol. 7, pp. 43-48. https://doi.org/10.7185/geochemlet.1818

APA

Saji, N. S., Larsen, K., Wielandt, D., Schiller, M., Costa, M. M., Whitehouse, M. J., Rosing, M. T., & Bizzarro, M. (2018). Hadean geodynamics inferred from time-varying 142Nd/144Nd in the early Earth rock record. Geochemical Perspectives Letters, 7, 43-48. https://doi.org/10.7185/geochemlet.1818

Vancouver

Saji NS, Larsen K, Wielandt D, Schiller M, Costa MM, Whitehouse MJ et al. Hadean geodynamics inferred from time-varying 142Nd/144Nd in the early Earth rock record. Geochemical Perspectives Letters. 2018;7:43-48. https://doi.org/10.7185/geochemlet.1818

Author

Saji, N.s. ; Larsen, K. ; Wielandt, D. ; Schiller, M. ; Costa, M.m. ; Whitehouse, M.j. ; Rosing, M.t. ; Bizzarro, M. / Hadean geodynamics inferred from time-varying 142Nd/144Nd in the early Earth rock record. In: Geochemical Perspectives Letters. 2018 ; Vol. 7. pp. 43-48.

Bibtex

@article{e382ad08d2a74a028207413bb2d69b29,
title = "Hadean geodynamics inferred from time-varying 142Nd/144Nd in the early Earth rock record",
abstract = "Tracking the secular evolution of 142Nd/144Nd anomalies is important towards understanding the crust-mantle dynamics in the early Earth. Excessive scatter in the published data, however, precludes identifying the fine structure of 142Nd/144Nd evolution as the expected variability is on the order of few parts per million. We report ultra-high precision 142Nd/144Nd data for Eoarchean and Palaeoarchean rocks from the Isua Supracrustal Belt (SW Greenland) that show a well-resolved 142Nd/144Nd temporal variability suggesting progressive convective homogenisation of the Hadean Isua depleted mantle. This temporally decreasing 142Nd/144Nd signal provides a direct measure of early mantle dynamics, defining a stirring timescale of <250 Myr consistent with vigorous convective stirring in the early mantle. The 142Nd/144Nd evolution suggests protracted crustal residence times of ~1000-2000 Myr, inconsistent with modern-style plate tectonics in the Archean. In contrast, a stagnant-lid regime punctuated by episodes of mantle overturns accounts for the long life-time estimated here for the Hadean proto-crust.",
author = "N.s. Saji and K. Larsen and D. Wielandt and M. Schiller and M.m. Costa and M.j. Whitehouse and M.t. Rosing and M. Bizzarro",
year = "2018",
doi = "10.7185/geochemlet.1818",
language = "English",
volume = "7",
pages = "43--48",
journal = "Geochemical Perspectives Letters",
issn = "2410-3403",
publisher = "European Association of Geochemistry",

}

RIS

TY - JOUR

T1 - Hadean geodynamics inferred from time-varying 142Nd/144Nd in the early Earth rock record

AU - Saji, N.s.

AU - Larsen, K.

AU - Wielandt, D.

AU - Schiller, M.

AU - Costa, M.m.

AU - Whitehouse, M.j.

AU - Rosing, M.t.

AU - Bizzarro, M.

PY - 2018

Y1 - 2018

N2 - Tracking the secular evolution of 142Nd/144Nd anomalies is important towards understanding the crust-mantle dynamics in the early Earth. Excessive scatter in the published data, however, precludes identifying the fine structure of 142Nd/144Nd evolution as the expected variability is on the order of few parts per million. We report ultra-high precision 142Nd/144Nd data for Eoarchean and Palaeoarchean rocks from the Isua Supracrustal Belt (SW Greenland) that show a well-resolved 142Nd/144Nd temporal variability suggesting progressive convective homogenisation of the Hadean Isua depleted mantle. This temporally decreasing 142Nd/144Nd signal provides a direct measure of early mantle dynamics, defining a stirring timescale of <250 Myr consistent with vigorous convective stirring in the early mantle. The 142Nd/144Nd evolution suggests protracted crustal residence times of ~1000-2000 Myr, inconsistent with modern-style plate tectonics in the Archean. In contrast, a stagnant-lid regime punctuated by episodes of mantle overturns accounts for the long life-time estimated here for the Hadean proto-crust.

AB - Tracking the secular evolution of 142Nd/144Nd anomalies is important towards understanding the crust-mantle dynamics in the early Earth. Excessive scatter in the published data, however, precludes identifying the fine structure of 142Nd/144Nd evolution as the expected variability is on the order of few parts per million. We report ultra-high precision 142Nd/144Nd data for Eoarchean and Palaeoarchean rocks from the Isua Supracrustal Belt (SW Greenland) that show a well-resolved 142Nd/144Nd temporal variability suggesting progressive convective homogenisation of the Hadean Isua depleted mantle. This temporally decreasing 142Nd/144Nd signal provides a direct measure of early mantle dynamics, defining a stirring timescale of <250 Myr consistent with vigorous convective stirring in the early mantle. The 142Nd/144Nd evolution suggests protracted crustal residence times of ~1000-2000 Myr, inconsistent with modern-style plate tectonics in the Archean. In contrast, a stagnant-lid regime punctuated by episodes of mantle overturns accounts for the long life-time estimated here for the Hadean proto-crust.

U2 - 10.7185/geochemlet.1818

DO - 10.7185/geochemlet.1818

M3 - Journal article

VL - 7

SP - 43

EP - 48

JO - Geochemical Perspectives Letters

JF - Geochemical Perspectives Letters

SN - 2410-3403

ER -

ID: 212301417