copper ores in the Tri Năng area, Lang Chánh District,
Thanh Hóa Province
Hồ Văn Tú
The Tri Năng area, Lang Chánh District, situated in the western
mountainous zone of the
The copper mineralization in Trí Năng is of hydrothermal origin, distributed along cataclastic zones in gabbro, or in the contact boundary between gabbro and sediments of the Đồng Trầu Formation. Copper ore bodies have the main mineral composition (%) of: pyrite = 0.1-10; chalcopyrite <0.1-7; pyrrhotine = 1-10; covelline <0.1; galenite = 0.1-5; sphalerite = 0.1-0.4; besides, there still are melnicovite, goethite, magnetite; rare minerals are chlorite, siderite, sphene, garnet and calcite (vein minerals). Content of Cu: 0.232-4.21%.
Hydrothermal alteration processes accompanying the copper mineralization strongly and complicatedly occurred, consisting of quartzification, sulphidization, carbonatization and skarnization.
Người biên tập: Trần Đình Sâm.