nerc.ac.uk

Continental Crust Rejuvenation Across the Paleo‐Mesoarchean Transition Resulted From Elevated Mantle Geotherms

Lu, Gui‐Mei; Xu, Yi‐Gang; Wang, Wei; Spencer, Christopher J.; Huang, Guangyu; Roberts, Nick M.W.. 2024 Continental Crust Rejuvenation Across the Paleo‐Mesoarchean Transition Resulted From Elevated Mantle Geotherms. Geophysical Research Letters, 51 (8), e2024GL108715. 10.1029/2024GL108715

Before downloading, please read NORA policies.
[thumbnail of Open Access Paper]
Preview
Text (Open Access Paper)
Geophysical Research Letters - 2024 - Lu - Continental Crust Rejuvenation Across the Paleo‐Mesoarchean Transition Resulted.pdf - Published Version
Available under License Creative Commons Attribution Non-commercial No Derivatives 4.0.

Download (2MB) | Preview

Abstract/Summary

The increase in initial Hf isotopes identified in early Mesoarchean detrital zircon is commonly interpreted as a reflection of the geodynamic transition from stagnant-lid to mobile-lid tectonics. However, given the lack of petrogenetic context, interpreting detrital zircon may lead to spurious conclusions. In this contribution, we use zircon U-Pb-Hf-O isotopic and bulk rock compositions of newly identified 3.05–2.9 Ga granitoids from the SW Yangtze Block to posit petrogenesis within an isotopically juvenile magmatic system. A statistical analysis of these data with a global igneous zircon Lu-Hf isotopic compilation reveals an increase in average initial radiogenic Hf isotopes during the Paleoarchean to Mesoarchean transition. We posit that the Earth's continental crust underwent a global rejuvenation across the Paleo-Mesoarchean transition. This rejuvenation can be explained by an independently observed increase in mantle temperatures resulting from mantle thermal evolution and does not require a change in tectonic style.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1029/2024GL108715
ISSN: 0094-8276
Date made live: 26 Apr 2024 14:41 +0 (UTC)
URI: https://nora.nerc.ac.uk/id/eprint/537349

Actions (login required)

View Item View Item

Document Downloads

Downloads for past 30 days

Downloads per month over past year

More statistics for this item...