Abstract:

In this paper, we use regional geological metallogenic characteristics of Taihe area in Sichuan as the research background, the high-precision airborne magnetic data as the research foundation, supplements it with regional gravity data, then combines with the measured physical properties of rocks (minerals), to study and analyze the geophysical characteristics of known iron ores and their surrounding areas. Finally, we select 5 anomalies at M47, M47-1, M47-2, M47-3, and M47-4. These anomalies demonstrate typical geophysical characteristics, signifying potential mineralization. The magnetic anomaly presents as an elliptical local bulge with a positive magnetic anomaly, whereas the vertical second-order gravity derivative field resembles a nasally bulging elliptical positive anomaly. Notably, vanadium-titanium magnetite and gabbro (ore-bearing) exhibit the strongest magnetism and highest density, resulting in significant magnetic anomalies and strong anomalies, as corroborated by geophysical data. Through ground surveying, we established a correlation between the M47 magnetic anomaly and the known orebody, while interpreting M47-1 and M47-2 as concealed ore-bearing basal intrusive rocks. Utilizing 2.5-D inversion with the GeoProbe and GMVPS software, we estimated the M47-1 and M47-2 anomalies to represent an orebody with 469 million tons of resources, highlighting the massive potential for further exploration. The M47-3 and M47-4 anomalies suggest the possible presence of buried magnetic ore bodies at a certain depth, warranting further investigation to explore the potential of vanadium-titanium magnetite associated with mafic intrusive rocks.

Key words: vanadium titanium magnetite, gabbro, aeromagnetic anomaly, geophysical characteristics