Emeritus Professor Alan Cooper, Department of Geology, University of Otago
A carbonatite is a carbonate-rich rock of apparent magmatic descent, first proposed from igneous complexes in Scandinavia. Although an igneous origin was initially hotly disputed, experimental work and other natural occurrences have confirmed the concept. Now, carbonatite complexes are highly prospective as potential sources of REE.
Petrogenetically, carbonatites are believed to result by combinations of fractional crystallisation and liquid immiscibility from silicate parent magmas, although direct melting of carbonated mantle is capable of generating small volumes of highly mobile carbonatite magma.
This presentation will outline the field relationships and origin of carbonatite magmas in complexes that I have been directly involved with, including occurrences in New Zealand, East and West Africa and Antarctica.
|Date||Thursday, 10 May 2018|
|Time||1:00pm - 2:00pm|
|Location||Benson Common Room (Gn9), Geology Building, 360 Leith Street, Dunedin|