Geophysical exploration in the Xi-Cheng lead-zinc orefield, Gansu Province, China

Wanwu Guo; Mike Dentith; Yue Zhao

doi:10.1071/EG00243

ISSN: 0812-3985
E-ISSN: 1834-7533

Geophysical exploration in the Xi-Cheng lead-zinc orefield, Gansu Province, China
Authors Wanwu Guo^a, Mike Dentith^b and Yue Zhao^c
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^a Department of Geology and GeophysicsThe University of Western Australia, Nedlands, , WA, 6907, Phone: (08) 9380 1920, Facsimile: (08) 9380 1037, E-mail: [email protected] ^b Department of Geology and GeophysicsThe University of Western Australia, Nedlands, , WA, 6907, Phone: (08) 9380 2676, Facsimile: (08) 9380 1037, E-mail: [email protected] ^c Institute of Geomechanics Chinese Academy of Geological Sciences, 11 South Minzhuxueyuan Road, Haidian, , Beijing, 100081, China, Facsimile: (86 10) 4842 2326, E-mail: [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: Exploration Geophysics, Volume 31, Issue 1-2, Mar 2000, p. 243 - 247
DOI: https://doi.org/10.1071/EG00243
- Published online: 01 Mar 2000

Abstract

The Xi-Cheng lead-zinc orefield lies in Gansu Province in north-central China. The orefield consists of several separate deposits and more than 200 orebodies in Middle Devonian schist and limestone. Examples include the Changba (Zn+Pb >3.8 Mt), Lijiagou (Zn+Pb >3.2 Mt), Huangchang (Zn+Pb ~1.0 Mt), Dengjiashan (Zn+Pb ~1.0 Mt) and Bijiashan (Zn+Pb >1.0 Mt) deposits. The deposits occur as stratiform and/or tabular forms with ores mainly comprising massive and banded pyrite, sphalerite and galena. The ore contains >8.5% of Zn+Pb, plus associated Ag, Cd, Ga, and Ge. Self-potential, ground magnetic, induced polarisation, resistivity and mise-a-la-masse surveys were carried out in the early stages of exploration in the late 1960s to early 1970s. This paper presents some examples of such surveys over the Changba, Lijiagou and Huangchang deposits. This early geophysical practice showed that: (1) the self-potential method was cheap and effective in rapid reconnaissance for mineralisation below thin cover, but the interpretation of the results was sometimes complicated by the presence of graphite in the host limestone; (2) the ground magnetics was able to define small but recognisable anomalies over shallow concealed mineralisation that contains a small amount of pyrrhotite and/or magnetite, as is often the case; (3) induced polarisation was very useful for mapping mineralisation hosted in schist, but was less useful in areas of graphite-bearing limestone; (4) attempts to use resistivity surveys for mapping mineralisation were largely unsuccessful; (5) mise-ala- masse surveys were not only useful for determining the horizontal extent of intersected mineralisation in drillholes, but were also able to indicate the presence of other mineralisation in the vicinity of the intersected mineralisation.

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References

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Article Type: Research Article

Keyword(s): Gansu; ground magnetics; induced polarisation; lead-zinc; mise-a-la-masse; self-potential; Xi-Cheng

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Geophysical exploration in the Xi-Cheng lead-zinc orefield, Gansu Province, China

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