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

Aarons, Sarah M.; Reimink, Jesse R.; Greber, Nicolas D.; Heard, Andy W.; Zhang, Zhe; Dauphas, Nicolas (2020). Titanium isotopes constrain a magmatic transition at the Hadean-Archean boundary in the Acasta Gneiss Complex. Science Advances, 6(50), pp. 1-8. American Association for the Advancement of Science 10.1126/sciadv.abc9959

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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 3.75billion years (Ga) in the Slave craton.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Institute of Geological Sciences

UniBE Contributor:

Greber, Nicolas

Subjects:

500 Science > 550 Earth sciences & geology

ISSN:

2375-2548

Publisher:

American Association for the Advancement of Science

Language:

English

Submitter:

Nicolas Greber

Date Deposited:

14 Jan 2021 10:55

Last Modified:

14 Jan 2021 10:55

Publisher DOI:

10.1126/sciadv.abc9959

PubMed ID:

33298445

BORIS DOI:

10.48350/149515

URI:

https://boris.unibe.ch/id/eprint/149515

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