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. https://doi.org/10.1029/2024GL108715

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Official URL: http://dx.doi.org/10.1029/2024GL108715

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):	https://doi.org/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

Item Type:

Publication - Article

Digital Object Identifier (DOI):

https://doi.org/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