Abstract
The role of metamorphism on refractory sulfides is not well constrained. Although experiments have displayed the effectiveness of high grade metamorphism, namely granulite facies metamorphism, on sulfide anatexis, its role in the presence of other variables is still poorly understood. Rocks from the Bay Islands Accretionary Complex in Honduras and the Ildeus-Lucha Complex in Russia exhibit extensive metamorphism. Sulfide mineralization is prolific in these rocks suggesting that metamorphism has played an important role in re-concentrating these sulfides during amphibolite and granulite facies metamorphism.
Highlights
Magmatic Ni-Co-Cu sulfide deposits are typically associated with layered intrusions in continental rifts [1, 2]
Amphibolite-facies sulfide metamorphism and anatexis is well-documented in Pb-Zn-Cu-Ag ore at Broken Hill (Australia) and similar deposits [8,9,10], the importance of sulfide metamorphism and possible anatexis in refractory sulfide systems is very poorly understood
The Bay Islands Acretionary Complex (BIAC) is an exhumed, accretionary terrane, which is located along the tectonically active, sinistral transform fault known as the Swan Islands – Motagua Fault Zone
Summary
Magmatic Ni-Co-Cu sulfide deposits are typically associated with layered intrusions in continental rifts [1, 2]. They form in crustal magmatic conduits through multiple injections of metal-rich, mantle-derived mafic magma followed by advanced fractional crystallization and, in many cases, assimilation of sulfur-rich country rock [3,4,5,6]. New data are presented for Ni-Co-Cu-PGE sulfide mineralization in subductionrelated ultramafic rocks from northern Honduras and the Stanavoy mobile belt of Eastern Siberia. The role of post-magmatic transformation in these accretionary terranes and the mobility of refractory sulfides under these conditions form the main focus of this paper
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