Peridotitic komatiites and the origin of ores (southeastern part of the Baltic Shield).

Abstract

The conformable bedding and interbedding of bodies of komatiites with pillow basalts and tuff horizons permit these rocks to be considered as peridotite komatiite lavas. Ni-Cu mineralization is orthomagmatic and associated with komatiite intrusives. The Ni potential seems to be inversely correlated with the appearance and size of island-arc basalts. In this sense the nearest analogues of the belts in the Baltic Shield are the Canadian greenstone belts, not the W Australian.-R.E.S.