David Cavell

David Cavell

School of Geography, Earth and Environmental Sciences
Doctoral Researcher

Contact details

Address
School of Geography, Earth and Environmental Sciences
University of Birmingham
Edgbaston
Birmingham
B15 2TT
UK

David is undertaking doctoral research into the geochemistry of rocks of the Northern Volcanic Zone of the Andes in Colombia and related rocks in the Panama isthmus as possible analogues for the Earth’s first stable continents. 

How and why the first continents formed on Earth is an open question in geoscience. The majority of continental crust preserved from early Earth history (4.0 – 3.0 Ga) is composed of a suite of rocks known as trondjhemites, tonalities and granodiorites (TTG). 

The geological setting for generation of this material remains controversial. Though some workers favour remelting of basalt at the base of thickened crust, most workers view a subduction setting as more likely. This is partly based on the fact that the TTG suite has a distinct chemical composition similar to rare modern arc lavas known as adakites. 

Recent work in Jamaica has described a sub-type of adakites derived from underplating of arc crust by oceanic plateau. Underplating or subduction of oceanic plateau is increasingly seen as a likely mechanism for generation of the earliest (4.0 – 3.6 Ga) continental crust. As the Caribbean plate is largely composed of oceanic plateau, material with a similar origin and geochemistry could exist elsewhere in the Caribbean and the margin of South America. This could provide a possible large scale analogue for production of the earliest TTG, and therefore the first stable continents. 

David has conducted extensive fieldwork in both Panama and Colombia as part of this research.

Qualifications

MGeol Geology

Biography

David obtained his MGeol Geology at the University of Leicester, with an MGeol thesis on the relationship between rear-arc and volcanic front geochemistry in the Scotia arc, and its bearing on sub-arc mantle flow. This was supervised by Dr Phil Leat, Professor Andy Saunders and Dr Tiffany Barry.

Doctoral research

PhD title
Investigating the role of oceanic plateaus in early continental growth
Supervisors
Dr Alan Hastie and Dr Sebastian Watt

Research

Research interests

  • Subduction zone magmatism
  • Igneous geochemistry
  • Volcanology