Skarns or tactites are coarse-grained metamorphic rocks that form by replacement of carbonate-bearing rocks during regional or contact metamorphism and metasomatism.

Skarn commonly forms around the edges of a magma body that intrudes a nearby rock mass. Rocks formed or altered by the interaction of magma, country rock, reactive fluids, and heat are known as skarn. Other environments of metasomatic activity are also known to produce skarn.

The skarn areas of Ginevro and Sassi Neri differ from all other Elbanean skarns. The amphibole (Fe-Pargasite) dominated skarns are characterized by veinlets (with bleached quartz-bearing rims and epidote minerals in the center), penetrating the surrounding Calamita Schists.

Apr 23, 2023 · Skarn is coarse-grained metamorphic rocks that forms by a metasomatism. Also called tactites. Skarn tend to be rich in calcium-magnesium-iron-manganese-aluminium silicate minerals that also regerred to calc-silicate minerals.

Several < facies:t or phases of skarn formation can be studied in a single hand specimen or thin section. They are generally coarse·grained and the minerals are strongly colored.

Nov 2, 2007 · Skarn mineralogy is mappable in the field and serves as the broader "alteration envelope" around a potential ore body. Because most skarn deposits are zoned, recognition of distal alteration features can be critically important in the early exploration stages.

Skarn, in geology, metamorphic zone developed in the contact area around igneous rock intrusions when carbonate sedimentary rocks are invaded by large amounts of silicon, aluminum, iron, and magnesium.

Oct 1, 2016 · The skarn has recently been recognised to comprise a more complex assemblage of minerals, including pyroxene, epidote and wollastonite together with garnet (Xu et al., 2016a). An orefield-scale zonation based upon variation in garnet colour is also suggested (Xu et al., 2014, Xu et al., 2016a).

Nov 21, 2022 · Compositions of accessory elements (wt.% oxides) in cassiterite grains from the chalcopyrite–scheelite (zone 1), sphalerite–magnetite (zone 2) and chalcopyrite–arsenopyrite (zone 3b) ore facies of the San Pietro skarn.

In the Oslo district Goldschmidt's (1911) classic account of contact metamorphism identified ten mineral assemblages in the high-temperature pyroxene hornfels facies, six of which involved calc-silicate minerals (Fig. 2).