Abstract:

This paper introduces the effect of geophysical prospecting in a copper polymetallic ore exploration area in Gongbo’gyamda County，Tibet. Through IP intermediate gradient area measurement,a high-polarizability anomaly region was delineated in the study area，and the anomaly related to ore deposits was inferred combined with geological and physical data. On this basis,the sounding profiles were distributed in the abnormal concentrate center used symmetrical four-pole device to detect the distribution of orebodies and guide the borehole layout. The drilling results verified the above geophysical inferences and achieved good practical effect; this survey results provided an important instruction on the next-step geological prospecting in this area.Furthermore, the characteristics of anomaly detected by IP sounding method were analyzed and the technology of IP sounding method was summarized to prospect porphyry copper deposit in the study area. This study provides a valuable reference for the application of geophysical prospecting method to explore the deep porphyry copper polymetallic ore in Gangdise metallogenic belt and the similar areas.

Key words: IP intermediate gradient, symmetric four-pole sounding, porphyry copper deposit, Gandise metallogenic belt, Gongbo’gyamda County