CHARACTERISTICS OF MAJOR FAULT ZONES IN THE QIANJIA AREA AND ANALYSIS OF ROCK AND ORE CONTROL

The fault zones in the Qianjia area are mainly of NW, NE and N-S trends and geomechanically of tenso-shear and compresso-shear origin.They originated in the Yanshanian period. The N-S-trending fault zone has been most strongly deformed and altered and is characterized by strong enrichment in Mo, Ag, Pb, Zn, Au and Mo, a very strong capacity of element fractionation and concentration, a pronounced phenomenon of element zoning and relatively strong ore-controlling effect. In the NE-trending fault zone the element contents vary greatly, generally exhibiting zones of different element assemblages.For the NW-trending fault zone, its ore-controlling effect is relatively weak, the element contents show a small variation, the capacity of element concentration is relatively poor and the degree of element fractionation is low.