Unit 7: Zircon U-Pb isotope age of granit and related mineralization in the Suối Ngần - Quảng Ngần deposit, Vị Xuyên, Hà Giang
Trần Mỹ Dũng1, La Mai Sơn2, Vũ Quang Lân2,
Nguyễn Trọng Dũng2, Bùi Tiến Dũng2, Tạ Văn Thắng3,4,
Đinh Xuân Hà2, Trần Hải Nam2, Trương Quang Hải2
1General Department of Geology and Minerals of Vietnam, 6 Phạm Ngũ Lão, Hà Nội; 2 Northern Geological Mapping Division, Nguyễn Văn Cừ street, Long Biên district, Hà Nội city; 3 Intergeo Division, Phạm Văn Đồng street, Bắc Từ Liêm district, Hà Nội city; 4 Chinese Geological University (Wuhan)
Corresponding author: tmd.humg@gmail.com
Received: 26/7/2019
Accepted: 12/10/2019
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.