Article: Titanium isotopes constrain a magmatic transition at the Hadean-Archean boundary in the Acasta Gneiss Complex

Plate subduction greatly influences the physical and chemical characteristics of Earth's surface and deep interior, yet the timing of its initiation is debated because of the paucity of exposed rocks from Earth's early history. We show that the titanium isotopic composition of orthogneisses from the Acasta Gneiss Complex spanning the Hadean to Eoarchean transition falls on two distinct magmatic differentiation trends. Hadean tonalitic gneisses show titanium isotopic compositions comparable to modern evolved tholeiitic magmas, formed by differentiation of dry parental magmas in plume settings. Younger Eoarchean granitoid gneisses have titanium isotopic compositions comparable to modern calc-alkaline magmas produced in convergent arcs. Our data therefore document a shift from tholeiitic- to calc-alkaline-style magmatism between 4.02 and 3.75 billion years (Ga) in the Slave craton.

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References

1.

Klaver M, Carey S, Nomikou P, Smet I, Godelitsas A, Vroon P . A distinct source and differentiation history for Kolumbo submarine volcano, Santorini volcanic field, Aegean arc. Geochem Geophys Geosyst. 2016; 17(8):3254-3273. PMC: 5114867. DOI: 10.1002/2016GC006398. View

2.

Greber N, Dauphas N, Bekker A, Ptacek M, Bindeman I, Hofmann A . Titanium isotopic evidence for felsic crust and plate tectonics 3.5 billion years ago. Science. 2017; 357(6357):1271-1274. DOI: 10.1126/science.aan8086. View

3.

Kelley K, Cottrell E . Water and the oxidation state of subduction zone magmas. Science. 2009; 325(5940):605-7. DOI: 10.1126/science.1174156. View

4.

Gerya T, Stern R, Baes M, Sobolev S, Whattam S . Plate tectonics on the Earth triggered by plume-induced subduction initiation. Nature. 2015; 527(7577):221-5. DOI: 10.1038/nature15752. View

5.

Komiya , Maruyama , Masuda , Nohda , Hayashi , Okamoto . Plate Tectonics at 3.8-3.7 Ga: Field Evidence from the Isua Accretionary Complex, Southern West Greenland. J Geol. 1999; 107(5):515-554. DOI: 10.1086/314371. View

6.

Dauphas N, Janney P, Mendybaev R, Wadhwa M, Richter F, Davis A . Chromatographic separation and multicollection-ICPMS analysis of iron. Investigating mass-dependent and -independent isotope effects. Anal Chem. 2004; 76(19):5855-63. DOI: 10.1021/ac0497095. View

7.

Escrig S, Capmas F, Dupre B, Allegre C . Osmium isotopic constraints on the nature of the DUPAL anomaly from Indian mid-ocean-ridge basalts. Nature. 2004; 431(7004):59-63. DOI: 10.1038/nature02904. View

8.

Rozel A, Golabek G, Jain C, Tackley P, Gerya T . Continental crust formation on early Earth controlled by intrusive magmatism. Nature. 2017; 545(7654):332-335. DOI: 10.1038/nature22042. View

9.

Hopkins M, Harrison T, Manning C . Low heat flow inferred from >4 Gyr zircons suggests Hadean plate boundary interactions. Nature. 2008; 456(7221):493-6. DOI: 10.1038/nature07465. View

10.

Silver P, Behn M . Intermittent plate tectonics?. Science. 2008; 319(5859):85-8. DOI: 10.1126/science.1148397. View

11.

Deng Z, Chaussidon M, Savage P, Robert F, Pik R, Moynier F . Titanium isotopes as a tracer for the plume or island arc affinity of felsic rocks. Proc Natl Acad Sci U S A. 2019; 116(4):1132-1135. PMC: 6347677. DOI: 10.1073/pnas.1809164116. View

Titanium Isotopes Constrain a Magmatic Transition at the Hadean-Archean Boundary in the Acasta Gneiss Complex