Regolith Exploration Geochemistry in Tropical and Subtropical Terrains
Hardbound. The use of exploration geochemistry has increased enormously in the last decade. The present volume specifically addresses those geochemical exploration practices appropriate for tropical, sub-tropical and adjacent areas - in environments ranging from rainforest to desert. Practical recommendations are made for the optimization of sampling, and analytical and interpretational procedures for exploration according to the particular nature of tropically weathered terrains. The underlying theme is the recognition that regions between 35N and 35S in particular have a common history of deep chemical weathering and lateritization during the late Mesozoic and early Tertiary. This has had a profound and lasting effect, so that the surface geochemical expressions of mineralization throughout these regions have many similar features, with local modification due to more recent weathering under changed climates.The volume discusses the da
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Geochemical dispersion and exploration models
2 Chemical weathering
Development of a weathering profile
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acid alkaline anomalies areas arid base metal bedrock calcrete carbonate chalcopyrite Chapter chemical clay climate commonly composition concentrations contents cuirasse deep weathering deposits depth developed dispersion halo dispersion models drilling duricrust enrichment environments erosion exploration Fe oxides ferruginous formation fraction geochemical geochemical dispersion geochemical response geochemistry gibbsite goethite gold gossans grains groundwater heavy minerals hematite horizon humic humid hydromorphic ironstones kaolinite kimberlite lamproite lateritic lateritic profile leaching material mineralization mineralogy mobile mottled zone nodules occur orebody outcrop oxides pathfinder elements pedogenic pisoliths ppm ppm ppm precipitation present primary mineralization processes prospect pyrite quartz rainfall rainforest regions regolith residual result rocks sample media saprolite savanna secondary minerals semiarid silica slopes smectites soil samples soluble stone line sulphide supergene surface surveys Table terrains thick tion trace elements transported overburden truncated ultramafic upper water-table weathering profile Western Australia