What is this layer?
Geochemistry RECALC is an extract of the Geological Survey of Western Australia’s (GSWA) geochemistry database that includes recalculated geochemical data. Oxides are calculated from corresponding element values, or vice versa, depending on what data is available. The geochemistry RECALC layer was created to provide geochemical data in a more useable format, allowing data to be more easily incorporated into map layers and geochemical discrimination diagrams.
Description
Geochemistry RECALC contains multi-element geochemical data for rocks, unconsolidated surface material (regolith) and drillcore collected by GSWA. Samples have been analysed for a range of major element oxides, trace elements, rare earth elements (REE), and isotopes by a variety of analytical approaches at commercial, government and university laboratories. Analytical data for each element in each sample includes the unit of measurement, lower level of detection (LLD) of that element, and an indication of the analytical technique (usually specified as a laboratory-specific code). Element oxides and element values are calculated from corresponding data as per the table below.
Operation
The operations performed on the GSWA geochemistry database to generate Geochemistry RECALC are listed below:
|
Al_ppm |
Aluminium in parts per million (ppm) calculated using [Al2O3_pct * 5292] when Al_ppm < 0 and Al2O3_pct > 0 |
|---|---|
|
Al2O3_pct |
Aluminium as Al2O3 in weight percent (wt%) calculated using [Al_ppm * 0.00018895] when Al2O3_pct < 0 and Al_ppm > 0 |
|
Ca_ppm |
Calcium in parts per million (ppm) calculated using [CaO_pct * 7147] when Ca_ppm < 0 and CaO_pct > 0 |
|
CaO_pct |
Calcium as CaO in weight percent (wt%) calculated using [Ca_ppm * 0.00013992] when CaO_pct < 0 and Ca_ppm > 0 |
|
Fe_ppm |
Iron in parts per million (ppm). If Fe_ppm exists (i.e. >0), then Fe_ppm equals the reported laboratory value. If Fe_ppm does not exist (i.e. <0), then Fe_ppm = Fe2O3T_pct * 7776, after Fe2O3T _pct has been calculated |
|
Fe2O3_pct |
Iron as Fe2O3 in weight percent (wt%). If Fe2O3_pct exists (i.e. >0), then Fe2O3_pct equals the reported laboratory value. If Fe2O3_pct does not exist (i.e. <0), then Fe2O3_pct = Fe2O3T_pct - FeO_pct, once Fe2O3T_pct and Fe_ppm has been calculated |
|
Fe2O3T_pct |
Fe2O3Total in weight percent (wt%). If Fe2O3T_pct exists (i.e. >0), then Fe2O3T_pct equals the reported laboratory value. If Fe2O3T_pct does not exist (i.e. <0), then Fe2O3T_pct = FeO_pct (>0) + Fe2O3_pct (>0). After which, if Fe2O3T_pct < 0 and Fe_ppm > 0, then Fe2O3T_pct = Fe_ppm * 0.0001286, applying to samples that do not have calculated Fe2O3T_pct values |
|
FeO_pct |
Iron as FeO in weight percent (wt%). If FeO_pct exists (i.e. >0), then FeO_pct equals the reported laboratory value. If FeO_pct does not exist (i.e. <0), then FeO_pct = Fe2O3T_pct – Fe2O3_pct, once Fe2O3T_pct and Fe_ppm has been calculated |
|
K_ppm |
Potassium in parts per million (ppm) calculated using [K2O_pct * 8302] when K_ppm < 0 and K2O _pct > 0 |
|
K2O_pct |
Potassium as K2O in weight percent (wt%) calculated using [K_ppm * 0.00012046] when K2O _pct < 0 and K_ppm > 0 |
|
Mg_ppm |
Magnesium in parts per million (ppm) calculated using [MgO_pct * 6031] when Mg_ppm < 0 and MgO_pct > 0 |
|
MgO_pct |
Magnesium as MgO in weight percent (wt%) calculated using [Mg_ppm * 0.00016582] when MgO_pct < 0 and Mg_ppm > 0 |
|
Mn_ppm |
Manganese in parts per million (ppm) calculated using [MnO_pct * 7745] when Mn_ppm < 0 and MnO_pct > 0 |
|
MnO_pct |
Manganese as MnO in weight percent (wt%) calculated using [Mn_ppm * 0.00012912] when MnO_pct < 0 and Mn_ppm > 0 |
|
P_ppm |
Phosphorus in parts per million (ppm) calculated using [P2O5 * 4364] when P < 0 and P2O5 > 0 |
|
P2O5_pct |
Phosphorus as P2O5 in weight percent (wt%) calculated using [P * 0.00022916] when P2O5 < 0 and P > 0 |
|
S_pct |
Sulfur in weight percent (wt%) calculated using [SO3 * 0.4004] when S < 0 and SO3 > 0 |
|
SO3_pct |
Sulfur as SO3 in weight percent (wt%) calculated using [S * 2.4972] when SO3 < 0 and S > 0 |
|
Si_ppm |
Silicon in parts per million (ppm) calculated using [SiO2 * 4675] when Si < 0 and SiO2 > 0 |
|
SiO2_pct |
Silicon as SiO2 in weight percent (wt%) calculated using [SiO2 * 0.00021392] when SiO2 < 0 and Si > 0 |
|
Ti_ppm |
Titanium in parts per million (ppm) calculated using [TiO2 * 5995] when Ti < 0 and TiO2 > 0 |
|
TiO2_pct |
Titanium as TiO2 in weight percent (wt%) calculated using [Ti * 0.00016681] when TiO2 < 0 and Ti > 0 |