SUMARRY

Characteristics of tungsten - tin ore of Bù Me, Thường Xuân, Thanh Hóa

Nguyễn Phương, Nguyễn Thị Thu Hằng,
Nguyễn Thị Cúc, Đỗ Văn Định, Nguyễn Phúc Tú

The Bù Me area is considered one of the promising areas of tungsten - tin ore in Vietnam, although it has been researched for a long time, but most of the research’s work are focused on research and investigation, evaluation and exploration of the surface corridors of the Đồi Tròn and Hồ Tôm area, the other areas have not been properly concerned. In order to have a basis for guiding the investigation, assessment and exploration activities in service of efficient and efficient exploitation and use of tungsten-tin minerals, the research and clarification of the characteristics of tungsten- tin in the area is very necessary. The results show that: Under the influence of magmatic activity of Bản Chiềng complex, the Formations of Đồng Trầu is strongly transformed; Notably, the process of quartz - muscovitization, horns developed overlap the greizenization zone. The ore is concentrated in the altered rock, quartz and keratinized alike, where it meets the skarn. Base ore with industrial value distributed mainly in Đồi Tròn area, the general rule is the thickness of ore body and the content of WO₃ and Sn in the ore bodies decreases as the distances of granite arch are greyzed by Đồi Tròn area. Industrial ore bodies are usually stocvovates and have few individual ore bodies. The ores are distributed in areas with different levels of erosion, so the level of ore occurrence in different zones is different; Đồi Tròn area was the most erosion and most visible, followed by Ho Tom area and finally Hồ Kín area. The ore composition is quite complex, the content of WO₃ in the Đồi Tròn and Hồ Kín area is higher than the Hồ Tôm area. In contrast, tin is concentrated in the Hồ Kín area, while in the Đồi Tôm and Hồ Tôm areas the content is very low, not significant independent. In essence, ore in the Bù Me area is tungsten ore, tin is the only element to go along. The ore was formed in two periods with five mineral forming phases; Phase 2 is the main stage of W-Sn formation, creating industrial ore bodies in the area. The ore is thermal translation source with high - medium temperature, top arch model containing the W-Sn.

Keywords: Tungsten - tin ore, Bù Me, Thanh Hóa.