Hydrated iron sulphate occurrences at Navarana fjord, Central North Greenland

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Abstract
Several occurrences of readily soluble hydrated sulphate minerals were found at Navarana Fjord in the northeastern part of Freuchen Land, central North Greenland. The sulphate minerals are copiapite, fibroferrite, gypsum, rozenite, melanterite and roemerite. In addition, limonite and pyrite are found. The mineralization occurs in faults and is found with the minerals in the above succession with a yellow crust of copiapite at the surface down to roemerite at a depth of 1.35 m. The generation of these sulphate minerals are considered to be a result of oxidation and hydration of pyrite. The sulphates, otherwise unstable at surface conditions, are preserved because of the very cold and dry climate in the arctic region of North Greenland.

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