三江北段沱沱河地区斑岩体特征及含矿性

Characteristics of Porphyry and Ore-bearing Potential in Tuotuo River Area

近年来三江北段斑岩型多金属成矿带找矿研究引起了广大学者的重视,已发现玉龙斑岩铜矿带,含矿岩性主要为花岗斑岩及二长花岗斑岩等,多为SiO_2>63%的富碱斑岩,成矿时代大概为40 Ma,其西延已发现纳日贡玛大型斑岩型铜钼矿床,成矿时代为42 Ma。沱沱河地区由于受自然条件的制约,地质工作相对滞后,近几年的矿产勘查工作,发现了扎拉夏格涌等具有斑岩型成矿特点的矿区,玉龙斑岩Cu带有望进一步西延。

The northern segment of Sanjiang belt with Jinsha River suture zone as the boundary is generally divided into east and west porphyry-copper belt. The west belt includes Yulong porphyry copper belt,whose ore-bearing lithologies are characterised by granite porphyry,including monzonitic granite porphyry,ivernite,a small amount of syenite porphyry and alkali-rich porphyry（ SiO_2 63%）. We think the metallogenic epoch might have occurred at about 40 Ma. The super-large Narigongma Mo-Cu deposit has been found in its westward extension. Due to the restriction of natural conditions in Tuotuo River Area. The geological work goes relatively slow. During mineral exploration work in recent years,several mining areas with porphyry-type metallogenic characteristics like Zhalaxiageyong mining area have been found. Yulong porphyry copper belt is expected to extend westward.