In the Voisey’s Bay complex, sulfide-matrix breccias developed through the percolation of dense sulfide melt, leading to the displacement of the silicate melt within partially molten silicate-matrix breccias. In these sulfide matrix-breccias, hydrous silicate rims are commonly present at the interface between the sulfide matrix and the silicate framework. Multiple lines of evidence support a magmatic origin of these hornblende-biotite rims, which was largely coeval with the emplacement of the sulfide melt in the magmatic breccias. The formation of the hornblende-biotite rims required the addition of alkalis and water that could not have entirely been sourced from either the sulfide melt or the silicate framework. Through the integration of compositional maps with major and trace element analyses of the main accessory minerals, we propose that the critical components required for the development of the hydrous silicate rims in sulfide-matrix breccias originated from an immiscible Fe-Ti-P melt. Distinct textural and compositional features of apatite, hercynite, ilmenite and magnetite support the presence of small amounts of Fe-Ti-P melt in the sulfide melt. This Fe-Ti-P melt likely formed through melt immiscibility in the early stages of the development of the Voisey’s Bay complex, and was transported in the magma conduits together with the sulfide melt.

在 Voisey's Bay 杂岩体中，硫化物-基体角砾岩是通过致密硫化物熔体的渗流形成的，导致硅酸盐熔体在部分熔融的硅酸盐-基体角砾岩中发生位移。在这些硫化物基质角砾岩中，含水硅酸盐边缘通常存在于硫化物基质和硅酸盐框架之间的界面处。多条证据线支持这些角闪石-黑云母边缘的岩浆起源，这在很大程度上与硫化物熔体在岩浆角砾岩中的放置同时代。角闪石-黑云母边缘的形成需要添加碱和水，而这些碱和水不可能完全来自硫化物熔体或硅酸盐框架。通过将成分图与主要辅助矿物的主量和微量元素分析相结合，我们提出硫化物基体角砾岩中含水硅酸盐边缘发育所需的关键成分来自不混溶的 Fe-Ti-P 熔体。磷灰石、黑铁矿、钛铁矿和磁铁矿的独特质地和成分特征支持硫化物熔体中存在少量的 Fe-Ti-P 熔体。这种 Fe-Ti-P 熔体可能是在 Voisey's Bay 杂岩体开发的早期阶段通过熔体不混溶形成的，并与硫化物熔体一起在岩浆管道中运输。