| Entwisle, D, Lee, K A, and Lawley, R S. 2015. User guide for ‘BGS Civils’ - a suite of engineering properties datasets. British Geological Survey Internal Report, OR/15/065.
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Primary classification of sulfate/sulfide as used in the GIS
| Primary Class
|
Description
|
| 0
|
Sulfate/sulfide not generally present.
|
| 1
|
Primary calcium sulfate present.
|
| 2
|
Iron sulfide and calcium carbonate present. The iron sulfide will or might oxidise to form sulfuric acid and react with calcium carbonate to form secondary gypsum.
|
| 3
|
Units that contain sulfides that might oxidise to form acid ground conditions.
|
| 4
|
Mixed, contains beds with iron pyrites and calcium carbonate and beds with iron pyrites and little or no calcium carbonate.
|
| 5
|
Contains beds of anhydrite or gypsum, and sulfides that might oxidise and react with calcium carbonate.
|
| 6
|
Unknown, lithologies not known.
|
| 7
|
Areas of mapped water – not applicable.
|
Secondary classification of sulfate/sulfide as used in the GIS
| SUL_CLSS
|
SUL_DESC
|
| 0A
|
Sulfate or sulfide that will oxidise are not normally present.
|
| 1A
|
Major sulfate bed. The sulfate might be leached from the near-surface zone, the thickness depends on local conditions.
|
| 1B
|
Sulfate common throughout as beds, nodules and veins. The sulfate might be leached from the near-surface zone, the thickness depends on local conditions.
|
| 1C
|
Sulfate beds, nodules and veins are present at certain levels. The sulfate might be leached from the near-surface zone; the thickness depends on local conditions.
|
| 1D
|
Sulfate beds, veins and nodules are present locally at certain levels. The sulfate might be leached from the near-surface zone; the thickness depends on local conditions.
|
| 1E
|
Minor sulfate: in beds present locally at certain levels or as dispersed nodules. The sulfate might be leached in the near surface zone; the thickness depends on local conditions.
|
| 2A
|
Sulfide oxidises in weathering zone or when disturbed and reacts with calcium carbonate to form secondary gypsum.
|
| 2B
|
Sulfide likely to oxidise in weathering zone or when disturbed and reacts with calcium carbonate to form secondary gypsum.
|
| 2C
|
Sulfide might be present and oxidise in weathering zone or when disturbed and react with calcium carbonate to form secondary gypsum.
|
| 2D
|
Sulfide and calcium carbonate might be present, unlikely to form secondary gypsum unless reworked.
|
| 2E
|
Sulfide and calcium carbonate might be present, unlikely to form secondary gypsum.
|
| 3A
|
Sulfide likely to oxidise in weathering zone or when disturbed to form acidic conditions.
|
| 3B
|
Sulfide likely to oxidise when disturbed to form acidic conditions.
|
| 3C
|
Sulfide present locally and might oxidise when disturbed to form acidic conditions.
|
| 3D
|
Sulfide might be present in some beds that will only oxidise when disturbed to form acidic conditions.
|
| 3E
|
Sulfide might be locally present in some beds and might oxidize when disturbed to produce acidic conditions.
|
| 4A
|
Mixed lithologies, with beds containing sulfide, sometimes with calcium carbonate. Sulfide oxidises when weathered.
|
| 4B
|
Mixed lithologies, with beds containing sulfide, sometimes with calcium carbonate. Sulfate might oxidize under some conditions (e.g. reworking).
|
| 4C
|
Mixed lithologies, sulfide beds occasionally present sometimes with calcium carbonate. Sulfide might oxidize under some conditions (e.g. reworking).
|
| 5A
|
Minor sulfate and sulfide and calcium carbonate beds present locally. Sulfate might be leached in the near surface zone, depth depends on zone local conditions. Sulfide might oxidise.
|
| 5B
|
Contains minor beds of sulfate and sulfides that might oxidise under unusual conditions such as mining operations or reworking.
|
| 6
|
Sulfate/sulfide content unknown (geology unknown).
|
| 7
|
No hazard (water body).
|