Abstract

Geochemical characteristics of molybdenum in granitoid at Ngọc Tụ area are quite complicated from bedrock to alteration zones and mineralization one as well. Molybdenum in the bed rock expresses lithophil character (Mo-Ta, Mo-Nb). In the alteration and mineralization zones, molybdenum is of strong siderophil character (Mo-Cu-Cr-Co) but still having lithophil (Mo-La) one. Concetration level of molybdenum in the granitoid is relatively high (Ktt = 4.73), at the same time its mobility is very high at the Ngọc Tụ area (V = 92, 88%); there is strong alteration of content in the space, high content of volatile matters is appeared, etc). On the basis of element zonation in vertical (upwardly Be Co Cd Zn V Sn Cu Mo W Bi As Cr Pb Ba), and in lateral (There is a shift of Mo into ore-forming solution when granitoid altered and molybdenite appeared, etc), distribution characteristics of geochemical anomalies (Mo, Bi, Cu) and geological characteristics (appearance of unexposed small-sized granitoid massifs), Ba Na granitoid is belonging to molybdenum metallogenic field and geochemical type favourable for this mineralization, which indicates that the deep metallogenic possibility of molybdenum might be existed.