Page 76 - Geochemical Remote Sensing of The Sub-Surface

Geoelectrochemistry and stream dispersion 53

Ag,% A
1 "10 5
1"10 ~
Mo,%
1.10 ~
I "10 5
Sn,%
1-10 ~
2"10 5
Cu,%
1 "10 2
2 "10 3
I "10 "~
l.le j
Au,g/t
I "10 2
1 "lO j /
n.10" % Cu/C,As/C B
n-10 "~ % Ag/C A
n.10 "~ % Au/C //

rlyl /
-

21T-~ 16Oral
~ Y y Yy
3m

Fig. 2-33. Results obtained over quartz-poor sulphide ore zone by (A) lithogeochemical survey
and (B) by the MPF method: 1- unconsolidated overburden; 2- andesite-dacite porphyrites; 3- ore
zone (reproduced with permission from Abaturova and Shkarupa, 1981).

GEOELECTROCHEMICAL EXPLORATION

Physico-chemical basis

The methods of geoelectrochemical exploration are based on investigation of the
polarisation curve (voltammogram), which records the dependence of a current through
an electronic conductor on its electrode potential. The electrode potential of an electronic
conductor is its potential measured with respect to an auxiliary standard non-polarisable
electrode which is immersed in the host ionic conductor in direct contact with the surface
of the electronic conductor.
Two of these methods, the Contact Polarisation Curve (CPC) and the Contactless
Polarisation Curve (CLPC) are used to investigate ore bodies with electronic