Magnetic Method Surveying and Its Application for the Concealed Ore-Bodies Prospecting of Laba Porphyry Molybdenum Ore Field in Shangri-La, Northwestern Yunnan Province, China

摘要: Recently, a number of large molybdenum (-copper) deposits have been discovered successively in the Laba area, Shangri-La county, northwestern Yunnan province. The investigation confirmed that there is a superlarge porphyry-skarn hydrothermal vein type molybdenum-polymetallic- metallogenic system with total prediction reservoir more than 150 mt molybdenum. The porphyry intrusions contributed to mineralization closely, superficial little (-copper, lead, silver) ore-bodies are usually located in faults and fractures, deep porphyry occurred the granodiorite porphyries, skarn contact zone intrused into Triassic limestone or Permian basalts. ore block new exploration area great prospecting potential. In order reduce the target guide further exploration work, magnetic method measurement about 3.3 square kilometres was carried out field. This paper presents an application analyzing horizontal vertical derivative, using Fast Fourier Transform (FFT) filter (FFT high-pass, low-pass, cosine roll-off, suscepbility), calculated spectra frequency energy predict the depth intensity apparent remanence magnetization source (Hilbert). results anomalous show the remanence anomaly caused by and Permian basalts small anomalies, located source not great. We identified positions three drilled well, the drilled result specify interpretation very high accuracy. magnetic method helpful identify mineralization, judge shape and depth concealed ore-bearing intrusive bodies under similar geological condition.