地磁梯度测量及其在金属矿勘查中的试验——以拉依克勒克铜铁矿为例

doi:10.11720/wtyht.2019.0143

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Abstract

With the progress in the study of ultra-high sensitivity and high precision magnetometers, magnetic gradient measurement has become possible, and is currently widely used in the field of engineering geophysical explorations such as non-explosives detection. In order to understand the difference between the measured magnetic gradient and the calculated magnetic gradient and its application effect on the metal ore, the authors carried out a 1∶5 000 magnetic gradient measurement test in the Laikluck copper-iron deposit in East Junggar, Xinjiang, The authors compared the difference and similarity between the measured magnetic gradient and the calculated magnetic gradient. It is found that the macroscopic trend of the measured magnetic gradient and the calculated magnetic gradient are basically the same, but there are differences in the anomaly details; when the point distance and the line spacing are not equal, the calculation of the magnetic gradient line is effective. In a certain direction, the magnetic anomaly has a tendency of lengthening along the direction of the line; the difference between the calculated gradient and the measured gradient in different intensity anomalies is the largest, especially the vertical gradient. The measured magnetic gradient has a relatively obvious detection advantage for burial shallow anomalous geological bodies, and can obtain more geological body information. For low-relief anomalies, the distance between the probes is limited due to the topographical conditions, and the magnetic anomalies are weak. Combined with the analysis of the exploration results of the Laikluck magnetite, it is considered that the measured magnetic gradient is sensitive to local anomaly detection, and the surrounding rocks are magnetic deposit such as volcanic rock. The geomagnetic gradient measurement is beneficial to delineating the magnetic boundary. The two-dimensional and three-dimensional vector of the measured magnetic gradient can also distinguish the nature of the anomaly and provide an indication for the prospecting prediction.

Key words： magnetic exploration magnetic gradient measurement calculated magnetic gradient Layikeleke copper-iron mine

Received: 18 March 2019 Published: 28 November 2019

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Corresponding Authors: Jia-Yong YAN E-mail: yanjy@163.com

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	Hao WANG
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	Gui-Xiang MENG
	Qing-Tian LU
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Cite this article:

Hao WANG,Jia-Yong YAN,Gui-Xiang MENG, et al. Geomagnetic gradient exploration and its test in metal deposits: a case study of the Layikeleke copper-iron deposit[J]. Geophysical and Geochemical Exploration, 2019, 43(6): 1173-1181.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2019.0143 OR https://www.wutanyuhuatan.com/EN/Y2019/V43/I6/1173

21]
Q—Quaternary; D₂b¹—First lithologic member of Middle Devonian; D₂b²—Second lithologic member of Middle Devonian;

D 22

—Middle Devonian andesite;

D 21

—Middle Devonian basalt; D₁t—Tuorangekuduke formation of Lower Devonian System;

γ 42

—Hercynian monzonitic granite; γ

π 42

—Hercynian granite porphyry; δ

O 42

—Hercynian quartz diorite; γ

δ 42

—early Hercynian granodiorite; γ

ξ 32

—Caledonian tonalite; βμ—diabase dikes
">

Geological map of the Layikeleke ore district, Eastern Junggar^[21]
Q—Quaternary; D₂b¹—First lithologic member of Middle Devonian; D₂b²—Second lithologic member of Middle Devonian;

D 22

—Middle Devonian andesite;

D 21

—Middle Devonian basalt; D₁t—Tuorangekuduke formation of Lower Devonian System;

γ 42

—Hercynian monzonitic granite; γ

π 42

—Hercynian granite porphyry; δ

O 42

—Hercynian quartz diorite; γ

δ 42

—early Hercynian granodiorite; γ

ξ 32

—Caledonian tonalite; βμ—diabase dikes

G858 Cs optical-pumping magnetomete (a), base station magnetometer(b)

Comparison of magnetic gradient and calculated magnetic gradient in Layikeleke copper iron ore
a—east-west horizontal magnetic gradient calculated from the total field;b—east-west measured magnetic gradient;c—calculate the difference between the east-west magnetic gradient minus the measured magnetic gradient;d—the north-south horizontal magnetic gradient calculated from the total field;e—the north-south direction measured magnetic gradient;f—the north-south direction to calculate the magnetic gradient minus measuring the difference in magnetic gradient;g—the vertical gradient calculated from the total field;h—the vertical measured magnetic gradient;i—calculating the difference between the magnetic gradient minus the measured magnetic gradient in the vertical direction;ZK—drillings

Measuring the gradient analysis signal (a) and the analytical signal obtained by calculating the gradient (b)

Magnetic gradient 2D vector diagram (the base map is a contour map of the polarization magnetic anomaly)

Magnetic gradient 3D vector diagram(the base map is a contour map of the polarization magnetic anomaly)

Horizontal projection of ore body speculated based on gradient vector
(The base map is a contour map of the polarization magnetic anomaly,the black polygon is the projection of the horizontal boundary of the magnetite body on the surface)

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