Page 16 - Geochemical Remote Sensing of The Sub-Surface
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XV
CONTENTS
Editor's foreword ............................................................................................................................. V
Preface .......................................................................................................................................... VII
List of contributors ......................................................................................................................... IX
PART I. GENETIC MODELS OF REMOTE DISPERSION PATTERNS
Chapter 1. Genesis, behaviour and detection of gases in the crust ................................................... 3
M. Hale
Introduction ................................................................................................................... 3
The geochemical background ........................................................................................ 4
The atmosphere ......................................................................................................... 4
The soil air ................................................................................................................ 6
Indicator and pathfinder gases for exploration .............................................................. 6
Gases contemporaneous with resource emplacement ............................................... 7
Gases of post-mineralisation provenance .................................................................. 7
Mechanisms of gas migration ........................................................................................ 8
Diffusion ................................................................................................................... 8
Mass flow ............................................................................................................... 11
Gas streaming ......................................................................................................... 12
Indicator and pathfinder gas data acquisition .............................................................. 13
Conclusions ................................................................................................................. 14
Chapter 2. Geoelectrochemistry and stream dispersion ................................................................. 17
O. F. Putikov and B. Wen
Introduction ................................................................................................................. 17
Geoelectrochemical prospecting ................................................................................. 17
Physico-chemical basis ........................................................................................... 17
Partial extraction of metals (CHIM) ....................................................................... 36
Diffusion extraction of metals (MDE) .................................................................... 46
Organometallic (MPF) and thermomagnetic (TMGM) patterns ............................. 49
Geoelectrochemical exploration .................................................................................. 53
Physico-chemical basis ........................................................................................... 53
Contact polarisation (CPC) ..................................................................................... 60
Contactless polarisation (CLPC) ............................................................................. 69
Polarographic logging (PL) ..................................................................................... 73
Discussion and conclusions ......................................................................................... 78
