A study of Quaternary structures in the Qom region, West Central Iran

Babaahmadi, A.; Safaei, Homayon; Yassaghi, Ali; Vafa, H.; Naeimi, Amir; Madanipour, Saeed; Ahmadi, Mahmood

doi:10.1016/j.jog.2010.04.006

Cited by 27 publications

(10 citation statements)

References 29 publications

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“…Location of seismic events in Text- fig. 11 Wakabayashi 2007; Morley et al 2009;Babaahmadi et al 2010;Nadimi and Konon 2012).…”

Section: Discussionmentioning

confidence: 99%

“…Stepovers associated with strike-slip faulting, where the folds are modified in a contractional overlap of faults, and the length-to-width ratios range from 2.5 to 3, were described e.g., along the San Andreas Fault (Sylvester 1988;Wakabayashi et al 2004;Wakabayashi 2007), along the northern margin of the Sanandaj-Sirjan Zone in the Zagros Orogen (Morley et al 2009;Babaahmadi et al 2010), and in the central part of this zone (Nadimi and Konon 2012).…”

Section: Discussionmentioning

confidence: 99%

“…Another example of active fault stepovers affecting the initiation of earthquakes is the overlap between the Indes and Qom faults and the Zefreh and Nain-Dehshir Faults forming en échelon arrays, where restraining stepover zones were recognized (Morley et al 2009;Babaahmadi et al 2010). The estimated total offsets along the Indes and the Qom-Zefreh faults are approximately 40-50 km (Allen et al 2011).…”

Section: Discussionmentioning

confidence: 99%

“…For example, one of the famous earthquakes, the M 7.9 1906 San Francisco, California earthquake is likely to have nucleated in a stepover structure (Zoback et al 1999;Oglesby 2005). Another example comes from the Indes-Qom stepover, where analysis of the earthquake focal mechanisms (for >Mw 5) revealed dextral oblique thrusting along the northern margin of the Sanandaj-Sirjan Zone within the restraining stepover zone (Morley et al 2009;Babaahmadi et al 2010).…”

Section: Introductionmentioning

confidence: 99%

“…Other structures useful for the precise identification of strike-slip movements in vertical cross-sections and on seismic profiles, as well as on geological maps and satellite images are: flower structures (e.g., Wilcox et al 1973), folds with a helicoidal geometry of the axial surfaces in restraining stepovers (Sylvester 1988;Babaahmadi et al 2010;Nadimi and Konon 2012), especially when they form an en échelon arrangement (Moody and Hill 1956;Jamison 1991;Woodcock and Schubert 1994), and vertical-axis rotated tectonic blocks bounded by major strike-slip faults (Woodcock and Fisher 1986;Mandl 1987;Sylvester 1988;Peacock et al 1998;Woodcock and Rickards 2003;Kim et al 2004;Konon 2007;Nadimi and Konon 2012). Apart from map-scale structures, identification of minor structures associated with major faults, such as slickensides observed within the near-surface parts of fault zones, horsetail splays, wing cracks or antithetic faults at the terminations of major faults, also demonstrate the presence of strike-slip movements.…”

Section: Introductionmentioning

confidence: 99%

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Mnin restraining stepover – evidence of significant Cretaceous–Cenozoic dextral strike-slip faulting along the Teisseyre-Tornquist Zone?

Konon¹,

Ostrowski²,

Rybak-Ostrowska³

et al. 2016

Acta Geologica Polonica

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ABSTRACT:Konon, A., Ostrowski, S., Rybak-Ostrowska, B., Ludwiniak, M., Śmigielski, M., Wyglądała, M., Uroda, J., Kowalczyk, S., Mieszkowski, R. and Kłopotowska, A. 2016. Mnin restraining stepover -evidence of significant Cretaceous-Cenozoic dextral strike-slip faulting along the Teisseyre-Tornquist Zone? Acta Geologica Polonica, 66 (3), 429-449. Warszawa.A newly recognized Mnin restraining stepover is identified in the Permo-Mesozoic cover of the western part of the Late Palaeozoic Holy Cross Mountains Fold Belt (Poland), within a fault pattern consisting of dextral strikeslip faults. The formation of a large contractional structure at the Late Cretaceous -Cenozoic transition displays the significant role of strike-slip faulting along the western border of the Teisseyre-Tornquist Zone, in the foreland of the Polish part of the Carpathian Orogen. Theoretical relationships between the maximum fault offsets/mean step length, as well as between the maximum fault offsets/mean step width allowed the estimation of the values of possible offsets along the Snochowice and Mieczyn faults forming the Mnin stepover. The estimated values suggest displacements of as much as several tens of kilometres. The observed offset along the Tokarnia Fault and theoretical calculations suggest that the strike-slip faults west of the Late Palaeozoic Holy Cross Mountains Fold Belt belong to a large strike-slip fault system.We postulate that the observed significant refraction of the faults forming the anastomosing fault pattern is related also to the interaction of the NW-SE-striking faults formed along the western border of the TeisseyreTornquist Zone and the reactivated WNW-ESE-striking faults belonging to the fault systems of the northern margin of the Tethys Ocean.

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“…Location of seismic events in Text- fig. 11 Wakabayashi 2007; Morley et al 2009;Babaahmadi et al 2010;Nadimi and Konon 2012).…”

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Mnin restraining stepover – evidence of significant Cretaceous–Cenozoic dextral strike-slip faulting along the Teisseyre-Tornquist Zone?

Konon¹,

Ostrowski²,

Rybak-Ostrowska³

et al. 2016

Acta Geologica Polonica

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Earth surface exchanges (ESEX) discussion of ‘Swelling and flow of expanding clays as a cause for nontectonic deformations in a glacial–interglacial environment: Holy Cross Mountains, Poland’ by E.Jurewicz, P.Karnkowski, A.Czarnecka‐Skwarek, E.Wójcik, I.Gawriuczenkow. Earth Surface Processes and Landforms2023: 1–16. https://doi.org/10.1002/esp.5609

Konon,

Domonik,

Ostrowski

et al. 2024

Earth Surf Processes Landf

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In a recently published report focused on the role of swelling of Triassic clays as the dominant process that led to the local steepening of competent Jurassic strata, its authors presented an opinion on the lack of evidence for the existence of the Gnieździska–Brzeziny strike‐slip fault along the contact between the Triassic and Jurassic rocks. This discussion presents the structural, geophysical, cartographic and geomechanical data indicating that the contact of Triassic and Jurassic rocks is defined by the vertical dextral strike‐slip Gnieździska–Brzeziny fault, which was formed after tilting of the beds in the Late Cretaceous. The presented evidence validates the tectonic deformation of Mesozoic rocks related to strike‐slip faulting. The dominant horizontal contraction across the fault planes within the restraining stepovers resulted in tilting of the beds, which is a well‐recognized phenomenon within the strike‐slip fault networks worldwide.

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Hydrogeochemistry study and groundwater quality assessment in the north of Isfahan, Iran

Rezaei

Hassani

2017

Environ Geochem Health

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This study presents the groundwater quality assessment in the north of Isfahan, Iran. In the study area, assessment and measurement of groundwater hydrochemical parameters such as pH, total dissolved solids (TDS), electrical conductivity (EC), sodium absorption ratio (SAR), total hardness, major cations (K, Na, Ca and Mg) and major anions (Cl, [Formula: see text] and [Formula: see text]) concentrations were performed. Accordingly, the 66 water samples from different locations were collected during April and May 2015. Water samples collected in the field were analyzed in the laboratory for cations and anions using the standard methods. In this research, the analytical results of physiochemical parameters of groundwater were compared with the standard guideline values as recommended by the world health organization (WHO) for drinking and public health purposes. The pH values of groundwater samples varied from 7.05 to 8.95 with a mean of 7.78, indicating a neutral to slightly alkaline water. TDS values showed that 14% of the samples exceeds the desirable limit given by WHO. EC values varied from 213 to 4320 µS/cm, while 23% of the samples were more than the standard limit. Gibbs diagram had shown that 90% of the samples in the study area fall in the rock weathering zone, and this means that chemical weathering of rock-forming minerals is the main factor controlling the water chemistry in the study area. Irrigation suitability and risk assessment of groundwater are evaluated by measuring EC, %Na, SAR and RSC. According to the dominant cations and anions, five types of water were identified in the water samples: Ca-HCO, Ca-SO, Na-Cl, Na-HCO and Na-SO. The results show that the majority of samples (30 samples, 45%) belongs to the mixed Na-SO water type. Correlation analysis and principal component analysis was used to identify the relationship between ions and physicochemical parameters. Results indicated that 18 stations of the study area had the best quality and can be used for irrigation and drinking purposes in the future.

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A study of Quaternary structures in the Qom region, West Central Iran

Cited by 27 publications

References 29 publications

Mnin restraining stepover – evidence of significant Cretaceous–Cenozoic dextral strike-slip faulting along the Teisseyre-Tornquist Zone?

Mnin restraining stepover – evidence of significant Cretaceous–Cenozoic dextral strike-slip faulting along the Teisseyre-Tornquist Zone?

Hydrogeochemistry study and groundwater quality assessment in the north of Isfahan, Iran

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