西藏帮浦东段—笛给铅锌矿区CSAMT异常特征与深部找矿预测

doi:10.11720/wtyht.2021.1465

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Abstract

The shallow resources of lead-zinc deposits are gradually decreasing in eastern Bangpu of Tibet, and hence deep and side exploration is imperative. The authors used CSAMT to carry out deep exploration and make prospecting prediction of lead-zinc deposits in the Bangpu-Digei mining area. The geophysical profiles were deployed in accordance with the 100 m×40 m survey network, and 373 physical points were determined. CSAMT data processing was conducted for the magnetic field intensity so as to calculate the full-region apparent resistivity and obtain the full-region apparent resistivity data at 42 840 sites. Then, the CSAMT anomaly map of full-region apparent resistivity in the exploration area were compiled, and four abnormal areas of electrical conductivity were delineated, i.e., high resistivity abnormal areas R1, R2, R3 and low resistivity abnormal areas R4. Combined with previous exploration data, the authors carried out geological interpretation of CSAMT data and established corresponding prospecting prediction model. The further drilling verification results prove the reliability of CSAMT prediction results.

Key words： lead-zinc deposits in eastern Bangpu-Digei area CSAMT full-region apparent resistivity metallogenic models deep prospecting prediction

Received: 22 September 2020 Published: 29 April 2021

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	Xiao-Long CHEN
	Po GAO
	Shun-Da CHENG
	Xiao-Qing WANG
	Ke LUO

Cite this article:

Xiao-Long CHEN,Po GAO,Shun-Da CHENG, et al. A study of anomaly characteristics of CSAMT and deep prospecting prediction of the lead-zinc deposits in eastern Bangpu-Digei mining area of Tibet[J]. Geophysical and Geochemical Exploration, 2021, 45(2): 361-368.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2021.1465 OR https://www.wutanyuhuatan.com/EN/Y2021/V45/I2/361

Geological diagram of the lead-zinc deposits in eastern Bangpu—Digei
1—Quaternary broken plot and alluvial product; 2—Quaternary residual slope product; 3—Quaternary alluvial products; 4—the first lithologic section of the Dianzhong group: tuffite,volcanic breccia,andesite; 5—the second lithologic section of the Dianzhong group: andesite,volcanic breccia; 6—Upper Permian Pangna group: a small amount of quartzite schist; 7—Lower Permian Luobadui group: marble、tuffaceous slate、carbonaceous slate ; 8—dacite; 9—biotite monzonitic granite; 10—Early Himalayan medium-fine-grained diorite; 11—quartz porphyry; 12—ore body location and number; 13—geological boundaries; 14—infer fault location and number; 15—pick up the sample taken by location and number; 16—Digei mining area; 17—mining area in the east section of Bangpu; 18—the scope and measuring line of the work of CSAMT; 19—verification drilling

Rock and ore physical parameters characteristic table of the lead-zinc deposits in eastern bangpu—digei

Site photo of the buried electrode of the field source and the receiver tank

Resistivity inversion of H_y full-region apparent resistivity anomaly diagram

Schematic diagram of the deposit model

Profile inversion anomaly diagram of H_y full-region apparent resistivity of 210 line and 250 line

Line 210 profile inversion anomaly diagram of H_y full-region apparent resistivity and borehole verification diagram

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