Origin of the intrusion-related Lang Vai gold-antimony district (Northeastern Vietnam): Constraints from fluid inclusions study and C O S Pb isotope systematics

The Lang Vai ore district, located in the central part of the Lo Gam domain in the Northeast Vietnam, contains at least three deposits: Khoun Puc, Lang Vai, and Lung Luong. The general paragenetic sequences for these deposits may be represented by the following mineral associations (from early to late): (i) arsenopyrite, pyrite, native gold, sphalerite; (ii) Bi-rich Pb-Sb sulfosalts; (iii) Bi-poor Pb-Sb sulfosalts; (iv) Sb sulfosalts; (v)...