TY - JOUR
T1 - Oxidation of Archean upper mantle caused by crustal recycling
AU - Gao, Lei
AU - Liu, Shuwen
AU - Cawood, Peter A.
AU - Hu, Fangyang
AU - Wang, Jintuan
AU - Sun, Guozheng
AU - Hu, Yalu
N1 - Funding Information:
We sincerely wish to thank C.J. Hawkesworth for constructive suggestions to this contribution. We also want to thank X.S. Li with the help on mathematical statistics and R language technology. This study was financially supported by the National Natural Science Foundation of China (41530207 and 41772188), the China University of Geosciences, Beijing (2-9-2021-023), the Postdoctoral 823 Program for Innovative Talents of Shandong Province (SDBX2021003) and the Australian Research Council (FL160100168).
Publisher Copyright:
© 2022, The Author(s).
PY - 2022/12
Y1 - 2022/12
N2 - The redox evolution of Archean upper mantle impacted mantle melting and the nature of chemical equilibrium between mantle, ocean and atmosphere of the early Earth. Yet, the origin of these variations in redox remain controversial. Here we show that a global compilation of ∼3.8-2.5 Ga basalts can be subdivided into group B-1, showing modern mid-ocean ridge basalt-like features ((Nb/La)PM ≥ 0.75), and B-2, which are similar to contemporary island arc-related basalts ((Nb/La)PM < 0.75). Our V-Ti redox proxy indicates a more reducing upper mantle, and the results of both ambient and modified mantle obtained from B-1 and B-2 samples, respectively, exhibit a ∼1.0 log unit increase in their temporal evolution for most cratons. Increases in mantle oxygen fugacity are coincident with the changes in basalt Th/Nb ratios and Nd isotope ratios, indicating that crustal recycling played a crucial role, and this likely occurred either via plate subduction or lithospheric drips.
AB - The redox evolution of Archean upper mantle impacted mantle melting and the nature of chemical equilibrium between mantle, ocean and atmosphere of the early Earth. Yet, the origin of these variations in redox remain controversial. Here we show that a global compilation of ∼3.8-2.5 Ga basalts can be subdivided into group B-1, showing modern mid-ocean ridge basalt-like features ((Nb/La)PM ≥ 0.75), and B-2, which are similar to contemporary island arc-related basalts ((Nb/La)PM < 0.75). Our V-Ti redox proxy indicates a more reducing upper mantle, and the results of both ambient and modified mantle obtained from B-1 and B-2 samples, respectively, exhibit a ∼1.0 log unit increase in their temporal evolution for most cratons. Increases in mantle oxygen fugacity are coincident with the changes in basalt Th/Nb ratios and Nd isotope ratios, indicating that crustal recycling played a crucial role, and this likely occurred either via plate subduction or lithospheric drips.
UR - http://www.scopus.com/inward/record.url?scp=85131499208&partnerID=8YFLogxK
U2 - 10.1038/s41467-022-30886-4
DO - 10.1038/s41467-022-30886-4
M3 - Article
C2 - 35672309
AN - SCOPUS:85131499208
SN - 2041-1723
VL - 13
JO - Nature Communications
JF - Nature Communications
IS - 1
M1 - 3283
ER -