首页|Reconstructing seawater d(18)O and ?'O-17 values with solid Earth system evolution
Reconstructing seawater d(18)O and ?'O-17 values with solid Earth system evolution
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NSTL
Elsevier
There has been extensive debate about how to link sedimentary oxygen isotope records to changes in solid Earth and surface processes. We present a new model of coupled ocean-crust-mantle evolution to investigate the geological processes that are responsible for the evolution of seawater delta O-18 values. In our model, the rates of low-and high-temperature crustal alteration are constrained by mantle cooling and crustal evolution. This way, we were able to outline the possible path of solid Earth evolution that matches the observed seawater delta O-18 records. Our results suggest that marine delta O-18 values may have been as low as -10 parts per thousand to -5 parts per thousand in the late Archean. The corresponding delta'(17O) value may have been 0.015 parts per thousand +/- 0.01 parts per thousand in the late Archean and then decreased with time. The evolution of seawater delta O-18 is shown to be sufficiently sensitive to the history of continental formation, and our modeling suggests the presence of a considerable amount of continental crust in the early Archean. (C) 2022 Elsevier B.V. All rights reserved.
seawaterd(18)O and?' O-17crustal growthsolid Earth system evolutionOXYGEN ISOTOPIC COMPOSITIONGEOLOGICAL WATER CYCLECONTINENTAL-CRUSTTHERMAL EVOLUTIONGROWTHCONSTRAINTSPERSPECTIVEDELTA-O-18BARBERTONCREATION
Wostbrock, Jordan A. G.、Planavsky, Noah J.、Korenaga, Jun、Guo, Meng
NSTL
Elsevier
