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.