In gold-endowed greenstone belts, ore bodies generally correspond to orogenic gold systems (OGS) formed during the main deformation stage that led craton stabilization (syntectonic period). Most OGS deposits postdate and locally overprint magmatic-hydrothermal systems, such as Au-Cu porphyry mostly magmatic (synvolcanic period) polymetallic intrusion-related (IRGS) of syntectonic period. Porphy...

We studied zircon from banded iron formations (BIFs) in the Kostomuksha greenstone belt (KGSB), Karelian Craton, for first time. Here, BIFs are associated with Mesoarchean basalt-komatiites – BIF-1 and felsic volcanics BIF-2, as well Neoarchean graywackes BIF-3. All contain accessory zircon. Analysis of its isotopic age shows presence 1-4 clusters each sample. There single grains detrital most ...

Introduction: The chemical and physical processes by which spherules form during the condensation of impact-produced rock vapor clouds are poorly understood. Although efforts have been made to model the processes of spherule formation, there is presently a paucity of field data to constrain the resulting theoretical models. The present study examines the vertical compositional variability in a ...

Archean banded iron formations (BIF) represent a major contributor to better constraining and assessing the paleogeography evolution of cratons. In this context, we conducted an exhaustive sampling analysis campaign BIF units in Congo Craton, covering several greenstone belts within Ivindo, Kelle-Mbomo, Chaillu blocks. The REE + Y patterns suggest: (1) Interaction seawater with Fe-oxyhydroxides...

Abstract The ~3033 Ma Stella layered intrusion is hosted by supracrustal rocks of the Kraaipan–Madibe greenstone terrane, South Africa. studied portion consists mainly magnetite leucogabbro and anorthosite, as well several massive layers. hosts a laterally continuous, ~60-m-thick, PGE mineralized interval, with total resources amounting to 108t Pt + Pd Au, constituting one oldest known reef-sty...