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Tectonic controls on groundwater geochemistry in Hormozgan Province, Southern Iran

  • Mehdi Masoodi
  • Mahsa Rahimzadeh
Original Paper

Abstract

Hormozgan Province with arid climate is an important source of energy resources for Iran. This study investigates the results of hydrogeochemical investigation and its tectonic control in Hormozgan Province, Southern Iran. The chemical analysis of 158 groundwater samples was evaluated to determine the hydrogeochemical processes and ion concentration background in the region. Several NW-SE trending and NE-dipping basement reverse faults have intersected the area and have divided it into four tectonic terranes. Huge extension of Hormuz Formation in Zagros Foredeep tectonic terrane has increased the cations, Cl and SO4 concentration in groundwaters. HCO3 concentration in Sanandaj-Sirjan Zone and High Zagros is the result of silicate weathering or carbonates. Eighty-three percent of samples have negative CAI values in High Zagros, Sanandaj-Sirjan Zone, and eastern Zagros Fold Thrust Belt. The dominant hydrochemical facies of groundwater are Na-Mg-Ca-Cl (25.3% of samples) and Na-Mg-Cl (20.9% of samples). They are confined to the west of Main Zagros Reverse Fault and east of High Zagros Fault, respectively. The salt content of the groundwater indicates samples with very high salinity—as a result of Hormuz Formation—are mainly limited to the west of High Zagros Fault while samples with high to medium salinity are mainly limited to the east of this fault. Eastward increment of rock weathering is controlled with thrust faults activity of the area and southwestward migration of deformation front. Westward increment of evaporites is compatible with Hormuz Formation/salt dome density through the area.

Keywords

Groundwater geochemistry Tectonic control Hormozgan Province Salt dome 

Notes

Acknowledgments

The authors express the gratitude to the research council of Hormozgan University of Medical Sciences, for the financial support and the Water Research Center at University of Hormozgan (WRC-UH), for the field supports.

Supplementary material

12517_2018_3478_MOESM1_ESM.pdf (103 kb)
Online Resource 1 Chemical composition of groundwaters in the Hormozgan province (PDF 102 kb)
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Online Resource 2

Spatial distribution of TDS of the groundwater from the study area based on WHO (GIF 93 kb)

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Spatial distribution of pH of the groundwater from the study area (GIF 91 kb)

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12517_2018_3478_Fig9_ESM.gif (93 kb)
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Spatial distribution of Hardness of the groundwater from the study area based on WHO (GIF 92 kb)

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Distribution of Water-types based on Wilcox diagram (Wilcox 1955) (GIF 95 kb)

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High Resolution (TIFF 4549 kb)
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Rock Source Deduction based on “Cl/Sum Anions”. For more details, see text (GIF 94 kb)

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Rock Source Deduction based on “TDS”. For more details, see text (GIF 95 kb)

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Rock Source Deduction based on “(Na+K-Cl)/(Na+K-Cl+Ca)”. For more details, see text (GIF 99 kb)

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12517_2018_3478_Fig14_ESM.gif (101 kb)
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Rock Source Deduction based on “Na/Na+Cl”. For more details, see text (GIF 101 kb)

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Rock Source Deduction based on “Ca/Ca+SO4)”. For more details, see text (GIF 99 kb)

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High Resolution (TIFF 4939 kb)

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Copyright information

© Saudi Society for Geosciences 2018

Authors and Affiliations

  1. 1.Department of Geology, Faculty of SciencesUniversity of HormozganBandar AbbasIran
  2. 2.Food Health Research CenterHormozgan University of Medical SciencesBandar AbbasIran
  3. 3.Department of Biochemistry, Faculty of MedicineHormozgan University of Medical SciencesBandar AbbasIran

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