Page 19 - Geochemical Remote Sensing of The Sub-Surface

XVIII Contents

Soil ....................................................................................................................... 223
Case histories ............................................................................................................ 225
Ordos Basin .......................................................................................................... 225
Lixian Depression ................................................................................................. 229
Conclusions ............................................................................................................... 231

Chapter 7. Aerospace detection of hydrocarbon-induced alteration ............................................ 233
H. Yang, F.D. Van der Meer and J. Zhang
Introduction ............................................................................................................... 233
Hydrocarbon microseepage .................................................................................. 233
Induced surface manifestations of microseepage .................................................. 234
Remote detection of induced surface manifestations ................................................ 235
Bleached red beds ................................................................................................. 236
Kaolinisation ......................................................................................................... 238
Carbonate enrichment ........................................................................................... 238
Vegetation stress ................................................................................................... 240
Other anomalies ................................................................................................... 244
Problems and future trends ........................................................................................ 244

PART III. REMOTE DISPERSION PATTERN OF POST-GENETIC PROVENANCE

Chapter 8. Sulphur gases ............................................................................................................. 249
M.E. Hinkle and J.S. Lovell
Introduction ............................................................................................................... 249
Chemistry and geochemistry of sulphur gases .......................................................... 250
Experimental techniques ........................................................................................... 256
Sample collection ................................................................................................. 256
Analysis by gas chromatography .......................................................................... 259
Other methods of analysis .................................................................................... 267
Reference materials .............................................................................................. 267
Sample storage and preparation for analysis ......................................................... 269
Degassing soils and molecular sieve adsorbents ................................................... 269
Injection of samples .............................................................................................. 270
Recording analytical results .................................................................................. 270
Case histories ............................................................................................................ 270
Johnson Camp, Arizona ........................................................................................ 271
North Silver Bell, Arizona .................................................................................... 283
Crandon, Wisconsin .............................................................................................. 285
Kazakhstan ........................................................................................................... 286
Ireland ................................................................................................................... 286
Discussion ................................................................................................................. 287
Conclusions ............................................................................................................... 288

Chapter 9. Sulphide anions and compounds ................................................................................ 291
X. Sun
Introduction ............................................................................................................... 291
Experimental investigations ...................................................................................... 291