东天山某环状熔融岩体航空电磁场特征及深部找矿研究

doi:10.11720/wtyht.2022.1196

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Abstract

A ringed molten rock mass in eastern Tianshan, Xinjiang is closely related to Au-Pb-Zn mineralization. Since the mineralization occurs in the fault fracture zone near the outer contact zone between the rock mass and strata, it is necessary to find out the spatial distribution of the rock mass and the development of the fault structure. The processing and analysis of the 1∶25 000 high-resolution airborne transient electromagnetic and aeromagnetic data yielded the following airborne electromagnetic characteristics of the rock mass. The ringed molten rock mass displayed positive and negative alternating ringed aeromagnetic fields. There were four NWW-trending banded zones with strong electromagnetic responses along the ringed molten rock mass, with a time constant of generally 0.07~0.18 ms. Seven NWW-trending faults were inferred and interpreted using the high-value band of the electromagnetic response of the 23rd trace of the dB/dt X component and the aeromagnetic anomaly zone with amplitude of 5~10 nT. By combining the airborne electromagnetic characteristics and three-dimensional inversion results of magnetic vectors, the lithology and structures of the study area were inferred and interpreted again, roughly ascertaining the three-dimensional distribution characteristics of the diorites. Based on these results as well as the known metallogenic geological conditions and the airborne electromagnetic characteristics, two prospecting favorable areas were delineated in the areas with strong electromagnetic responses to the west and southwest of the ringed molten rock mass. This study provides important information on the deep prospecting of the rock mass.

Key words： ringed molten rock mass airborne transient electromagnetic aeromagnetic deep prospecting eastern Tianshan

Received: 08 April 2021 Published: 17 August 2022

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	Bo YANG
	Dong-Hua SUN

Cite this article:

Bo YANG,Dong-Hua SUN. Airborne electromagnetic characteristics and deep prospecting of a ringed molten rock mass in eastern Tianshan[J]. Geophysical and Geochemical Exploration, 2022, 46(4): 816-823.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2022.1196 OR https://www.wutanyuhuatan.com/EN/Y2022/V46/I4/816

Geological sketch of the study area and gold-lead-zinc mining area

Demonstration of sliding Tau algorithm to calculate Time Constants

X and Fraser filtered X (FFx) components for thin target

VTEM time constant (Tau) image of the study area

VTEM dB/dt z component channel 10 image

VTEM dB/dt X component fraser filtered channel 23 image

3D low resistivity voxels with survey line resistivity-depth sections

Reduced to pole total magnetici intensity (TMI) image

Magnetic first vertical derivative image

Inferred spatial distribution of rock mass with survey line magnetic susceptibility-depth sections

Inferred and interpreted lithological structure

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