Separation of geochemical anomalies using inverse distant weighting (IDW) and concentration-area (C-A) fractal modeling based on stream sediments data in Janja Region, SE Iran

Year 2018, Volume: 156 Issue: 156, 167 - 178, 27.06.2018

Marzieh Hosseininasab Ali Akbar Daya

https://doi.org/10.19111/bulletinofmre.351449

Abstract

In this study, the Inverse Distant Weighting (IDW) and the
Concentration –area (C-A) fractal methods were used for identifi cations of
geochemical anomalies in Janja region, SE Iran. Eight elements (Au, Cu, Mn, Zn,
Fe, As, Mo, and Pb) from 300 stream sediment samples were used. The studied
area was gridded by 250 m×250 m cells. Estimation of unsampled locations were
carried out by inverse distant squared weighting (IDWS) method. Geochemical
maps were generated. Log- log plots of cumulative frequency of elemental
concentrations versus related areas were constructed. Threshold values were
obtained by fi nding break points in the log-log plots. There were four
geochemical populations for As, Fe, Mo, Pb and Zn and fi ve geochemical
populations for Au, Cu, and Mn. The resulted geochemical anomaly maps obtained
from fractal modelling showed that Anomalies of Zn, Mo, Mn, Fe, Cu and As
located in southeastern part of study area. There was a good correlation
between faults and elementals anomalies. It can be concluded that
mineralization occurred along the faults. There was a correlation between
anomalies and sedimentary rocks (alluvium and recent alluvium sediments) in SE
part of study area. Gold anomalies were located in the NW parts of the studied
area. There was a strong relationship between the location of Au anomalies and
fault systems in the NW parts of the studied area. Iron concentrations were
sporadic and correspond to the sedimentary volcanic rock and turbidites.

Keywords

Geochemical anomalies, Stream sediments, Concentration-area fractal model, Janja, Sistan and Baluchestan

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