Description
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Origin of Material
Greenstone belts are zones of variably metamorphosed mafic to ultramafic volcanic sequences with associate sedimentary rocks that occur within Archaean and Proterozoic cratons between granite and gneiss bodies. Greenstone belts are primarily formed of volcanic rocks, dominated by basalt, with minor sedimentary rocks inter-leaving the volcanic formations. The material comes from the Greenstone belt in Barberton.
Approximate Mineral and Chemical Composition
The mineral assemblages of the samples are rich in greenschists and associated minerals. Greenschists is a generic name of minerals formed by regional metamorphism of mafic igneous rocks under the relatively low temperatures and pressures. The name greenstone originates from commonly having an abundance of green minerals such as chlorite/chamosite, Actinolite/ and amphiboles and sheets-like minerals such as biotite/muscovite. The common minerals associated with greenschists include quartz, orthoclase, and calcite. The greenschists minerals are generally the pathfinders/ indicative of base metal sulphides and gold mineralisation.
Summary Statistics
Certified Concentrations
Au Pb Collection 1.19 0.095 g/t
C Combustion/LECO 2.02 0.036 %
S 4A_MICP 0.28 0.05 %
S Combustion/LECO 0.25 0.04 %
SG SG 2.86 0.17 Dimensionless
LOI LOI 8.60 0.17 %
Al 4A_MICP 6.01 0.38 %
As 4A_MICP 441 78 ppm
Be 4A_MICP 1 0.32 ppm
Bi 4A_MICP 0.7 0.09 ppm
Cd 4A_MICP 0.1 0.04 ppm
Ce 4A_MICP 34 6 ppm
Co 4A_MICP 38 3 ppm
Cs 4A_MICP 9 0.4 ppm
Cu 4A_MICP 79 5 ppm
Fe 4A_MICP 5.95 0.32 %
Ga 4A_MICP 15 2 ppm
Hf 4A_MICP 2 0.5 ppm
In 4A_MICP 0.05 0.02 ppm
K 4A_MICP 2.03 0.14 %
La 4A_MICP 18 2 ppm
Li 4A_MICP 33 6 ppm
Mg 4A_MICP 3.28 0.37 %
Mn 4A_MICP 1237 115 ppm
Mo 4A_MICP 3 0.8 ppm
Nb 4A_MICP 2 0.6 ppm
Ni 4A_MICP 327 37 ppm
P 4A_MICP 361 38 ppm
Pb 4A_MICP 17 5 ppm
Rb 4A_MICP 100 16 ppm
Sc 4A_MICP 17 2 ppm
Sn 4A_MICP 2 0.5 ppm
Sr 4A_MICP 96 14 ppm
Th 4A_MICP 5 0.3 ppm
Tl 4A_MICP 0.5 0.09 ppm
U 4A_MICP 1 0.1 ppm
V 4A_MICP 117 12 ppm
W 4A_MICP 3 0.8 ppm
Y 4A_MICP 8 1 ppm
Zn 4A_MICP 99 10 ppm
Major Oxides Certified Concentrations
Al2O3 XRF 11.27 0.32 %
CaO XRF 2.85 0.041 %
Cr2O3 XRF 0.31 0.01 %
Fe2O3 XRF 8.54 0.085 %
K2O XRF 2.42 0.049 %
MgO XRF 5.56 0.16 %
MnO XRF 0.16 0.01 %
Na2O XRF 1.09 0.016 %
P2O5 XRF 0.091 0.02 %
SiO2 XRF 58.25 1.1 %
TiO2 XRF 0.54 0.06 %
