Maps for Geology of the Fox orebody, northern Manitoba

Abstract: The Fox Mine is an Aphebian Cu-Zn massive sulphide deposit. This study documents the relationship between the ore body, its host metavolcanic rocks, its alteration zone and the metamorphic history of the area. The Fox Mine area can be divided into four blocks, separated by faults, which are essentially conformable with the stratigraphy and foliation. The rocks within the area are primarily metavolcanic, ranging from mafic to felsic. Minor amounts of metasedimentary rocks are also present. The metavolcanic and metasedimentary rocks of the area have been intruded by mafic and felsic intrusions of several ages, and have undergone medium-grade (amphilbolite) metamorphism. The ore body is massive, essentially stratiform and stratabound, and exhibits a strong copper-zinc zonation. Zinc is concentrated along the margins, with copper in the center. The ore body shows signs of metamorphism to a level equal to the surrounding silicate rocks... The Fox ore body is compared with other massive sulphide deposits considered to be of volcanogenic origin, and is compatible with this model assuming the deposit has been isoclinally folded. Evidence for this folding is found in the copper-zinc zonal patterns.

摘要：福克斯矿（Fox Mine）是一处古元古代（Aphebian）铜锌块状硫化物矿床（massive sulphide deposit）。本研究阐明了该矿床矿体、容矿变火山岩（host metavolcanic rocks）、蚀变带（alteration zone）与区域变质作用历史（metamorphic history）之间的内在关联。
福克斯矿区可划分为四个受断层（faults）分隔的地块，这些断层与地层（stratigraphy）及面理（foliation）基本产状一致。区内岩石以变火山岩为主，岩性跨度从基性（mafic）到酸性（felsic），同时伴生少量变沉积岩（metasedimentary rocks）。区内的变火山岩与变沉积岩受到多期次基性与酸性侵入体（intrusions）的侵入，并经历了中级（角闪岩相，amphibolite）变质作用（metamorphism）。
矿体呈块状，整体为层状（stratiform）且受地层控制（stratabound），呈现出显著的铜锌分带（copper-zinc zonation）特征：锌元素富集于矿体边缘，铜元素则集中于矿体中心。该矿体的变质程度与周边硅酸盐岩相当……
研究将福克斯矿体与其他被认为属火山成因（volcanogenic origin）的块状硫化物矿床进行对比，结果表明，若该矿床曾遭受等斜褶皱（isoclinally folded）作用，则其与该成因模型完全契合；而其铜锌分带特征即可作为该等斜褶皱作用的直接佐证。