Projects per year
Abstract
The mechanisms and timing of long term chemical differentiation of the Earth are fundamental questions in the geosciences. We present detrital zircon U-Pb, O and Hf isotope data from Fennoscandia to assess how crustal growth can be reconciled with its known >1.5 billion year geological history. A broadly linear evolution (176Lu/177Hf = 0.0403), from chondritic mantle at the age of the oldest identified Fennoscandian crust, to present day MORB values (εHf(0 Ma) ≈ þ16), provides a good fit with the most radiogenic zircon and whole rock Hf isotope data from the region. This mantle reference gives crustal growth peaks that correlate with known regional orogenic events. In contrast, a conventional 4.5 Ga strongly depleted mantle generates growth peaks outside of known geologic activity. Applying the same approach to the East Pilbara Terrane and SW Greenland yields model age peaks that also align with known magmatic activity. We propose that more geologically relevant crust formation ages are obtained via referencing a mantle source defined by the most radiogenic zircons/samples in the studied region.
Original language | English |
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Pages (from-to) | 7-13 |
Number of pages | 7 |
Journal | Geochemical Perspectives Letters |
Volume | 32 |
Early online date | 16 Sept 2024 |
DOIs | |
Publication status | Published - 2024 |
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Dive into the research topics of 'Refining Hf crust formation ages in Precambrian terranes'. Together they form a unique fingerprint.Projects
- 2 Finished
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Expanding the frontiers of mass spectrometry: a laser ablation multiple split streaming (LAMSS) facility for Australia
Kemp, A. (Chief Investigator), McCulloch, M. (Chief Investigator), Fiorentini, M. (Chief Investigator), McCuaig, C. (Chief Investigator), Rate, A. (Chief Investigator), Rasmussen, B. (Chief Investigator), Evans, N. (Chief Investigator) & Clark, C. (Chief Investigator)
ARC Australian Research Council
1/01/15 → 31/12/15
Project: Research
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Advanced Facility for Climate & Environmental Change Research in Australias Indian Ocean Region
McCulloch, M. (Chief Investigator), Cawood, P. (Chief Investigator), Waite, A. (Chief Investigator), Lowe, R. (Chief Investigator), Kilburn, M. (Chief Investigator), Clode, P. (Chief Investigator), Falter, J. (Chief Investigator), Wyrwoll, K.-H. (Chief Investigator), Lynch, M. (Chief Investigator), Wasson, R. (Chief Investigator), Lavery, P. (Chief Investigator), Trotter, J. (Chief Investigator), McNaughton, N. (Chief Investigator) & Loneragan, N. (Chief Investigator)
ARC Australian Research Council
1/01/10 → 31/12/10
Project: Research