Depositional model for banded iron formation host to gold in the Archean Rio das Velhas greenstone belt, Brazil, based on geochemistry and LA-ICP-MS magnetite analyses

2019 ◽  
Vol 94 ◽  
pp. 102205
Author(s):  
Joanna Chaves S. Araújo ◽  
Lydia M. Lobato
Keyword(s):  
Greenstone Belt ◽  
Iron Formation ◽  
Depositional Model ◽  
Banded Iron Formation ◽  
Icp Ms

The application of the mise-a-la-masse electrical technique in Greenstone belt gold exploration

1989 ◽  
Vol 20 (2) ◽  
pp. 113
Author(s):  
L.G.B.T. Polomé
Keyword(s):  
Greenstone Belt ◽  
Electrical Potential ◽  
Gold Deposits ◽  
Iron Formation ◽  
Banded Iron Formation ◽  
Current Electrode ◽  
Barberton Greenstone Belt ◽  
A Current ◽  
Ore Zones ◽  
Gold Bearing

Most of the gold deposits in the Barberton Greenstone belt of South Africa are relatively small and in structurally complex geological areas.The mise-a-la-masse electrical technique, where a current electrode is earthed in a mineralised zone, was used on one of our exploration projects consisting of a sulphides/gold-bearing carbonaceous banded iron formation within a succession of mafic, ultramafic and sedimentary rocks. The technique was successful in delineating individual mineralised units within a broad lithological sequence. During the survey, electrical potential measurements were recorded on surface, in underground drives and in twenty five boreholes. Measurements were also repeated by earthing the mineralised zone in a number of boreholes. Major discontinuities were recognised within the ore zones and used to interpret geological structures. These were then used to define specific units for ore reserve calculations and the application of selected mining techniques.

scholarly journals Petrography and Geochemistry of the Banded Iron Formation of the Gangfelum Area, Northeastern Nigeria

2017 ◽  
Vol 7 (1) ◽  
pp. 25
Author(s):  
Anthony Temidayo Bolarinwa
Keyword(s):  
Iron Oxide ◽  
Inductively Coupled Plasma ◽  
Optical Emission ◽  
Iron Formation ◽  
Icp Oes ◽  
Banded Iron Formation ◽  
Basement Complex ◽  
Inductively Coupled ◽  
Iron Precipitation ◽  
Icp Ms

The Gangfelum Banded Iron Formation (BIF) is located within the basement complex of northeastern Nigeria. It is characterized by alternate bands of iron oxide and quartz. Petrographic studies show that the BIF consist mainly of hematite, goethite subordinate magnetite and accessory minerals including rutile, apatite, tourmaline and zircon. Chemical data from inductively coupled plasma optical emission spectrometer (ICP-OES) and inductively coupled plasma mass spectrometer (ICP-MS) show that average Fe2O3(t) is 53.91 wt.%. The average values of Al2O3 and CaO are 1.41 and 0.05 wt.% respectively, TiO2 and MnO are less than 0.5 wt. % each. The data suggested that the BIF is the oxide facies type. Trace element concentrations of Ba (67-332 ppm), Ni (28-35 ppm), Sr (13-55 ppm) and Zr (16-25 ppm) in the Gangfelum BIF are low and similar to the Maru and Muro BIF in northern Nigeria and also the Algoma iron formation from North America, the Orissa iron oxide facies of India and the Itabirite from Minas Gerais in Brazil. The evolution of the Gangfelum BIF involved metamorphism of chemically precipitated or rhythmically deposited iron-rich sediments into hematite-quartz rocks. The banding of the BIF suggested a break in iron precipitation probably due to iron oxide deficiency. 

scholarly journals Gold Mineralization in Banded Iron Formation in the Amalia Greenstone Belt, South Africa: A Mineralogical and Sulfur Isotope Study

2013 ◽  
Vol 63 (2) ◽  
pp. 119-140 ◽  
Author(s):  
Kofi Adomako-Ansah ◽  
Toshio Mizuta ◽  
Napoleon Q. Hammond ◽  
Daizo Ishiyama ◽  
Takeyuki Ogata ◽  
...  
Keyword(s):  
South Africa ◽  
Greenstone Belt ◽  
Sulfur Isotope ◽  
Gold Mineralization ◽  
Iron Formation ◽  
Banded Iron Formation ◽  
Isotope Study
Sign in / Sign up

Export Citation Format

Share Document