GL5 Resources Essay2003 Prospecting Q4 MS Describe one geophysical and one geochemical technique use to prospect for mineral resources. In each case name.

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Presentation transcript:

GL5 Resources Essay2003 Prospecting Q4 MS Describe one geophysical and one geochemical technique use to prospect for mineral resources. In each case name a mineral for which the technique might be suitable and explain any limitations that the technique might have. [25]

GL5 Resources Essay2003 Prospecting Q4 MS Geophysical Named resource-e.g.oil / gas Techniques-e.g.seismic, magnetic, gravity Seismic-explosions/ land/ ship reflection record of 2-way time graphical representation to identify structures/ oil traps Magnetic-magnetometer land/ plane/ ship graphical representation of magnetic readings depends on changes in magnetic properties or distribution of rocks i.e. structures Gravity-gravimeter land/ plane/ ship changes in gravity/ changes in density of the underlying rocks reflects the structure(s) graphical representation (including labelled diagrams)

GL5 Resources Essay2003 Prospecting Q4 MS Geochemical Named resource-e.g.tin / copper / (name of mineral) Technique-stream sampling / water / sediment / soil (auger) /(vegetation) laboratory investigation / chemical analysis (atomic absorption) spectrometer laboratory and site for mineral/sediment identification plotted on map to locate (approx?) location of source / deposit Limitations :e.g.gravity requires sharp density contrast e.g.stream sampling / laboratory back-up