Skarn
Skarns or tactites are coarse-grained
If a skarn has a respectable amount of ore mineralization that can be mined for a profit, it can be classified as a skarn deposit.[2][3][4]
Etymology
Skarn is an old Swedish mining term originally used to describe a type of silicate
Petrology
Skarns are composed of calcium-iron-magnesium-manganese-aluminum silicate minerals. Skarn deposits are economically valuable as sources of metals such as tin, tungsten, manganese, copper, gold, zinc, lead, nickel, molybdenum and iron.[5]
A skarn is formed by a variety of metasomatic processes during metamorphism between two adjacent lithologic units. Skarns can form in almost any rock type such as shale, granite, or basalt but the majority of skarns are found in carbonate rocks containing limestone or dolomite. It is common to find skarns near plutons, along faults and major shear zones, in shallow geothermal systems, and on the bottom of the sea floor.[4] The specific mineralogy of skarns are highly related to the mineralogy of the protolith.[7]
Skarn mineralogy is dominated by
Classification
Skarns can be subdivided depending on specific criteria. One way to classify a skarn is by its protolith. If the protolith is of sedimentary origin, it can be referred to as an exoskarn and if the protolith is igneous, it can be called an endoskarn.[3][4]
Further classification can be made based on the protolith by observing the skarn's dominant composition and the resulting alteration assemblage. If the skarn contains minerals such as
Rocks that contain garnet or pyroxene as major phases, and that are also fine-grained, lack iron, and have skarn-like appearances, are generally given the term "skarnoid". Skarnoid is therefore the intermediate stage of a fine-grained hornfels and a coarse-grained skarn.[3][4]
Skarn ore deposits
Metal ore deposits that have skarn as gangue are called skarn deposits and can form by any combination of closed metamorphism or open system metasomatism, although most skarn deposits are thought to be related to magmatic-hydrothermal systems.[1] Skarn deposits are classified by their dominant economic element, e.g., a copper (Cu) skarn deposit or a molybdenum (Mo) skarn deposit.[2][3][5]
Fe (Cu, Ag, Au) skarn deposits
The tectonic setting for calcic Fe skarns tends to be the oceanic island arcs. The host rocks tend to range from gabbro to syenite associated with intruding limestone layers. The tectonic setting for magnesium Fe skarns tends to be the continental margin. The host rocks tend to be granodiorite to granite associated with intruding dolomite and dolomitic sedimentary rocks. Magnetite is the principal ore in these types of skarn deposits which its grade yields from 40 to 60 %. Chalcopyrite, bornite and pyrite constitute minor ores.[9][10]
Cu (Au, Ag, Mo, W) skarn deposits
The tectonic setting for Cu deposits tends to be the Andean-type plutons intruding older continental-margin carbonate layers. The host rocks tend to be quartz diorite and granodiorite. Pyrite, chalcopyrite and magnetite are typically found in higher abundances.[9][10]
Formation
Generally, there are two types of skarns that form, exoskarns and endoskarns.[11]
Exoskarns are more common and form on the outside of an intrusive body that comes into contact with a reactive rock unit. They are formed when fluids left over from the crystallisation of the intrusion are ejected from the mass at the waning stages of emplacement, in a process called boiling. When these fluids come into contact with reactive rocks, usually carbonates such as limestone or dolomite, the fluids react with them, producing alteration (infiltration metasomatism).[4]
Endoskarns form within the intrusive body where fracturing, cooling joints, and stockworks have been produced, which results in a permeable area. This permeable area can be altered by fluids originally sourced from the intrusion itself, after interacting with surrounding rocks (protolith). Thus, both the composition and the textures of protoliths strongly play a role in the formation of the resulting skarn. Endoskarns are considered to be rare. [4]
Reaction skarns are formed from isochemical metamorphism occurring on thinly interlayered sedimentary units, via small-scale[a] metasomatic exchange between adjacent units.[4][12]
Skarnoids are calc-silicate rocks that are fine-grained and iron poor. Skarnoids tend to be found between hornfels and coarse-grained skarn.[13][14][15] Skarnoids commonly reflect the composition of the protolith.[4]
Most large skarn deposits experience a transition from early metamorphism—which forms
The skarn deposits that are considered economically important for containing valuable metals are a result of large-scale metasomatism, where the composition of fluid controls the skarn and its ore mineralogy. They are relatively coarser grained and do not strongly reflect the composition of protolith or surrounding rocks.[3][4]
Uncommon types of skarns are formed in contact with sulfidic or carbonaceous rocks such as black shales, graphite shales, banded iron formations and, occasionally, salt or
Ore deposits
The major economic metals that are sourced from skarn deposits are copper, tungsten, iron, tin, molybdenum, zinc-lead, and gold.[2][3][4][5] Other minor economic elements include uranium, silver, boron, fluorine, and rare-earth elements.[4]
Some examples of the major economic skarn deposits, both current and historical, are:
- Iron skarns: Dashkesan Mine, Azerbaijan
- Copper skarns: Bingham Canyon Mine, Utah, U.S.A
- Tungsten skarns: Sangdong mine, South Korea
- Gold-bearing skarns: Hedley Mascot Mine, British Columbia, Canada
- Zinc-lead skarns: Santa Eulalia, Chihuahua, Mexico
- Nickel skarns: Avebury Mine, Zeehan, Tasmania (Australia)
- Molybdenum skarns: Yangchiachangtze mine, China
See also
- Ore genesis – How the various types of mineral deposits form within the Earth's crust
Notes
- ^ (on the order of a few centimetres)
References
- ^ ISBN 978-1-9349-6953-3, retrieved 2023-07-14
- ^ .
- ^ a b c d e f g h i j Ray, G.E., and Webster, I.C.L. (1991): An Overview of Skarn Deposits; in Ore Deposits, Tectonics and Metallogeny in the Canadian Cordillera; McMillan, W.J., compiler, B. C. Ministry of Energy, Mines and Petroleum Resources, Paper 1991-4, pages 213-252.
- ^ a b c d e f g h i j k l m n o p Meinert, L.D., 1992. Skarns and Skarn Deposits; Geoscience Canada, Vol. 19, No. 4, p. 145-162.
- ^ a b c d e Hammarstrom, J.M., Kotlyar, B.B., Theodore, T.G., Elliott, J.E., John, D.A., Doebrich, J.L., Nash, J.T., Carlson, R.R., Lee, G.K., Livo, K.E., Klein, D.P., 1995. Cu, Au, and Zn-Pb Skarn Deposits, Chapter 12; United States Geological Survey: Preliminary Compilation of Descriptive Geoenvironmental Mineral Deposit Models: https://pubs.usgs.gov/of/1995/ofr-95-0831/CHAP12.pdf.
- ^ Burt, Donald M. (1977). "Mineralogy and petrology of skarn deposits" (PDF). Societa Italiana Mineralogia Petrolgia Rendiconti. 33 (2): 859–873.
- ISSN 0009-2541.
- ^ "Hydrothermal and Skarn Deposits". www.geol-amu.org. Retrieved 2018-03-29.
- ^ S2CID 128816207.
- ^ .
- ISSN 0022-3530.
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- ^ Korzhinskii, D.S. (1948). "Petrology of the Tur'insk skarn deposits of copper". 68 (10). Ser. Rundnykh Mestorozhdenii. Academy nauk SSSR: Institute of Geology Nauk Trudy: 147.
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