Do Cenozoic analogues support a plate tectonic origin for Earth's earliest continental crust?

Hastie, Alan, Kerr, Andrew Craig ORCID: https://orcid.org/0000-0001-5569-4730, McDonald, Iain ORCID: https://orcid.org/0000-0001-9066-7244, Mitchell, S. F., Pearce, Julian A., Wolstencroft, Martin and Millar, I. L. 2010. Do Cenozoic analogues support a plate tectonic origin for Earth's earliest continental crust? Geology 38 (6) , pp. 495-498. 10.1130/G30778.1

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Abstract

Archean continental crust largely comprises the trondhjemite, tonalite, and granodiorite/dacite (TTG/D) suite of igneous rocks. Formation of the earliest Archean (>3.5 Ga) TTG/Ds is controversial, being attributed to either subduction zone processes with active plate tectonics or thermochemical mantle convection with no plate tectonic processes. A suite of Cenozoic adakite-like lavas in Jamaica has geochemical compositions comparable to early Archean TTG/D. The data indicate that the adakites were generated by underthrusting (or subducting) and partial melting of oceanic plateau crust beneath Jamaica. This setting is analogous to proposed plate tectonic processes in the early Archean where hot, thick, and more buoyant Archean oceanic crust underthrusts adjacent plates. The new adakite data imply that earliest Archean TTG/D continental crust could have formed above primitive subduction zones.

Item Type:	Article
Status:	Published
Schools:	Advanced Research Computing @ Cardiff (ARCCA) Earth and Environmental Sciences
Subjects:	Q Science > QE Geology
Publisher:	Geological Society of America
ISSN:	0091-7613
Last Modified:	17 Oct 2022 10:13
URI:	https://orca.cardiff.ac.uk/id/eprint/7379

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