STUDY ON THE CONCENTRATION REGULARITY AND METALLOGENIC MODEL OF PLACER GOLD DEPOSITS IN THE “GOLDEN TRIANGLE” AREA

The placer gold deposits of the "golden triangle" area are distributed mainly in the following positions:1) near the Mianxian-Pingwu deep-large fault zone;2) the intersection of NW-trending subsidiary fractural zone and the major deep-large fault zone;3) the transforming position of northwestern low-to-middle mountainous area to southeastern hills;4) the lower parts of the intersection of main stream and branches; and 5)the drainage near the developed area of quartz veins.The metallogenic model is as follow:high gold-containing geologic body→reformed by ectodynamic process, gold separated from its parent and occurred as fine grained gold partly transferred from micrograined to fine-grained→deposited in drainage→reformed and migrated to the present position, and formed placer gold deposit with certain scale at last.