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.