Cardiff University | Prifysgol Caerdydd ORCA
Online Research @ Cardiff 
WelshClear Cookie - decide language by browser settings

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

Hastie, Alan, Kerr, Andrew Craig, McDonald, Iain, 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

Full text not available from this repository.

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 Ocean Sciences
Subjects: Q Science > QE Geology
Publisher: Geological Society of America
ISSN: 0091-7613
Last Modified: 04 Jun 2017 02:00
URI: http://orca.cf.ac.uk/id/eprint/7379

Citation Data

Cited 34 times in Scopus. View in Scopus. Powered By Scopus® Data

Actions (repository staff only)

Edit Item Edit Item