Brian Upton on the Unique Rift Zone of South Greenland
Listen now
Between 1.3 and 1.1 billion years ago, magma from the Earth's mantle intruded into a continent during the assembly of the supercontinent called Nuna. Through good fortune, the dykes and central complexes that resulted have been preserved in near-pristine condition in what is now the south of Greenland. The dykes are extraordinarily thick, and the central complexes contain an order of magnitude more exotic minerals than otherwise similar complexes around the world. In the podcast, Brian Upton describes what he found during over 20 seasons of field work there and explains how extreme fractionation of the magma might be responsible for the one-of-a-kind central complexes. Brian Upton is Emeritus Professor of Geology at the University of Edinburgh.  During his long and prolific research career, he has conducted field studies in many parts of the world, concentrating especially on the Arctic.  But throughout his career he has continued to investigate the unique alkaline rocks of South Greenland.  As he explains in the podcast, these rocks contain an unrivalled number of exotic minerals, many of them not known to occur anywhere else. Web: Twitter: @geology_bites Insta: geologybites email: [email protected]
More Episodes
We know that most magma originates in the Earth’s mantle. As it pushes up through the many kilometers of lithosphere to the surface, it pauses in one or more magma chambers or partially melted mush zones for periods of up to a few millennia before erupting. But while we have seismic evidence and...
Published 05/06/24
Published 05/06/24
At roughly 15-25-million-year intervals since the Archean, huge volumes of lava have spewed onto the Earth’s surface. These form the large igneous provinces, which are called flood basalts when they occur on continents. As Richard Ernst explains in the podcast, the eruption of a large igneous...
Published 04/10/24