三维AMT正反演技术对贵州马坪含金刚石岩体探测的精细解释

doi:10.11720/wtyht.2022.1189

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Abstract

The "Dongfang No.1" rock mass in the Maping area, Zhenyuan County, Guizhou is the parent rock of a primary diamond-bearing deposit discovered in China for the first time. Studies have shown that the rock mass found in the Maping area is of the shallow facies of the kimberlite magmatic system, and large-scale concealed rock pipes or buckets may exist in the deep part. To reveal the spatial distribution of deep diamond-bearing concealed rock pipes or buckets in the Maping area, this study carried out the audio-magnetotelluric (AMT) data acquisition in the area using a high grid density of 80 m × 40 m. Then it simulated the pure terrain response in the study area using the 3D forward modeling and deducted the pure terrain response from the measured data. The obtained qualitative interpretation results restored the distribution morphology of AMT impedance phase invariants to some extent that was distorted by static effects. Afterward, this study performed the 3D inversion of the data using the AR-QN quasi-Newtonian inversion method. Based on the lithologic statistical results of the study area, the resistivity variation intervals of the underground units were set during the inversion, obtaining a reliable 3D electrical structure. Finally, this study carried out a fine interpretation of the geoelectric model of this area based on geological data such as rock tubes found on the surface and multiple dikes revealed by boreholes, outlining the morphology of concealed rock pipes or buckets. This study will provide a geophysical basis for the future prospecting and prediction of primary diamond deposits in this area.

Key words： concealed diamond tube audio-magnetotelluric (AMT) 3D forward modeling and inversion impedance phase invariant Maping area of Guizhou

Received: 08 April 2021 Published: 21 June 2022

ZTFLH:

P631

Corresponding Authors: YANG Bing-Nan E-mail: 307050903@qq.com;648417001@qq.com

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	Articles by authors
	Shuai HE
	Bing-Nan YANG
	Shuai RUAN
	Yong-Gang LI
	Yao-Fei HAN
	Da-Wei ZHU

Cite this article:

Shuai HE,Bing-Nan YANG,Shuai RUAN, et al. Fine Interpretation of the exploration results of diamond-bearing rock masses in Maping area, Guizhou using the 3D AMT forward modeling and inversion technologies[J]. Geophysical and Geochemical Exploration, 2022, 46(3): 618-627.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2022.1189 OR https://www.wutanyuhuatan.com/EN/Y2022/V46/I3/618

The geology background and location of AMT profile

Resistivity characteristics of rock (ore) in the study area

The resistivity structure map of study region

Coherence map between observed reference path and predicted value of AMT measuring point

The elevation map and location of AMT profile

Static displacement graph of measured data

Three-dimensional impedance phase invariant plan view of pure terrain background

Measured data 900 Hz impedance phase invariant correction before and after horizontal slices

Measured data 530 Hz impedance phase invariant correction before and after horizontal slices

Inversion resistivity and phase curve fitting diagram of sounding point

3D AMT inversion electrical structure diagram of the study area

3D inversion comprehensive interpretation slice map of measured data

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