T
Tim E. Johnson
Researcher at Curtin University
Publications - 118
Citations - 5230
Tim E. Johnson is an academic researcher from Curtin University. The author has contributed to research in topics: Metamorphism & Zircon. The author has an hindex of 31, co-authored 99 publications receiving 3607 citations. Previous affiliations of Tim E. Johnson include University of Maryland, College Park & University of Manchester.
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New mineral activity-composition relations for thermodynamic calculations in metapelitic systems
TL;DR: In this paper, activity composition (a-x) relations for minerals commonly occurring in metapelites are presented for use with the internally consistent thermodynamic dataset of Holland & Powell (2011, Journal of Metamorphic Geology, 29, 333-383).
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Delamination and recycling of Archaean crust caused by gravitational instabilities
TL;DR: The volume of Archaean crust preserved at Earth's surface today is low. as mentioned in this paper showed that the thick, primary crust that would have formed on a much hotter Archaean Earth was denser than the underlying mantle, and would have therefore been recycled back into the mantle as drips.
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The effect of Mn on mineral stability in metapelites revisited: new a–x relations for manganese-bearing minerals
TL;DR: In this article, the a-x relations for metapelitic rocks in the MnO-Na2O-CaO-K 2O-FeO-MgO-Al2O3-SiO2-H2O -TiO2 O2-O22 (MnNCKFMASHTO) system were extended to include MnO.
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Secular change in metamorphism and the onset of global plate tectonics
Michael Brown,Tim E. Johnson +1 more
TL;DR: In this article, thermal gradients of metamorphic rocks were analyzed for 456 localities from the Eoarchean to Cenozoic Eras to test the null hypothesis that thermal gradient through time did not vary outside of the range expected for each of these distinct plate tectonic settings.
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Earth's first stable continents did not form by subduction
TL;DR: This protracted, multistage process for the production and stabilization of the first continents—coupled with the high geothermal gradients—is incompatible with modern-style plate tectonics, and favours instead the formation of TTGs near the base of thick, plateau-like basaltic crust.