SUMMARY
Zircon U-Pb isotope age of granit and related
mineralization
in the Suối Ngần - Quảng Ngần
deposit, Vị Xuyên, Hà Giang
Trần Mỹ Dũng, La Mai Sơn, Vũ
Quang Lân, Nguyễn Trọng Dũng,
Bùi Tiến Dũng, Tạ Văn Thắng,
Đinh Xuân Hà, Trần Hải Nam, Trương Quang Hải
A series of wolfram (sheelite) deposits on the Sông Chảy
structural zone were discovered by the Northern Geological Mapping Division.
Study of the characteristics of geology and mineralization, the alteration of
the country rocks indicated that the wolfram (sheelite) mineralization in Suối
Ngần - Quảng Ngần deposit, within the skarn alteration zones,
are the product of metasomatic process between two mica granite and metamorphic
carbonate sedimentary rocks of lower part of the Thác Bà Formation. The
emplacement age of the two mica granite, collected at LK.6 in the Suối Ngần
- Quảng Ngần deposit, was determined by zircon U-Pb isotope is
420.8±3.8 Ma. This result suggests that wolfram (sheelite) mineralization in
this deposit related to magmatism took place during the Late Silurian - Early
Devonian of Sông Chảy complex, which is an important magma premise for
searching wolfram (sheelite) in the Sông Chảy structural belt and the
Northwest of Vietnam.
Keywords: Sông Chảy complex, two mica
granite, skarn, zircon U-Pb isotope.