• الصفحة الرئيسية
  • Application of C-A fractal model and exploratory data analysis (EDA) to delineate geochemical anomalies in the: Takab 1:25,000 geochemical sheet, NW Iran

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عنوان URL للمقالة


رقم المقالة : IJES-1610-1054 (R2) زيارة : 91 الصفحة: 173 - 180

نوع المخطوط: ابحاث

Application of C-A fractal model and exploratory data analysis (EDA) to delineate geochemical anomalies in the: Takab 1:25,000 geochemical sheet, NW Iran

الموضوعات :

Ahad Nazarpour 1 (Department of Geology, Ahvan Branch, Islamic Azad University, Ahvaz, Iran)

تاريخ الإرسال : 04 الجمعة , صفر, 1438 تاريخ التأكيد : 03 الإثنين , صفر, 1439 تاريخ الإصدار : 21 الإثنين , محرم, 1440

الکلمات المفتاحية: Takab, Fractal, Concentration-Area, Geochemical Anomaly, Iran,

ملخص المقالة :

Most conventional statistical methods aiming at defining geochemical concentration thresholds for separating anomalies from background have limited effectiveness in areas with complex geological settings and variable lithology. In this paper, median+2MAD as a method of exploratory data analysis (EDA) and concentration-area (C-A) fractal model as two effective approaches in separation geochemical anomalies, are used to identify geochemical anomalies in the Takab 1:25000 geochemical data sheet by using stream sediment geochemical data and lithogeochemical samples. We compared the anomalous area created using thresholds from various methods on the same data against known deposits and lithogeochemical samples. Results indicated that EDA methods are more impressible by lithology and could not well identify the geochemical anomalies in the areas with variable lithology. On the other hand, the C-A model based on the distinct anisotropic scaling properties, was better in revealing local geochemical anomalies, because it considered the spatial characteristics of geochemical variables.

المصادر:


  1.  Afzal P, Khakzad A, Moarefvand P, Omran NR, Esfandiari B, Alghalandis YF (2010) Geochemical anomaly separation by multifractal modeling in Kahang (Gor Gor) porphyry system, Central Iran, Journal of Geochemical Exploration 104:34-46.
    2.
  2. Agard P, Omrani J, Jolivet L, Mouthereau F (2005) Convergence history across Zagros (Iran): constraints from collisional and earlier deformation, International journal of earth sciences 94:401-419.
    3.
  3. Agterberg F (1995) Multifractal modeling of the sizes and grades of giant and supergiant deposits, International Geology Review 37:1-8.
    4.
  4. Agterberg F, Cheng Q, Wright D Fractal modeling of mineral deposits. In: 24th APCOM symposium proceeding, Montreal, Canada, 1993. pp 43-53
    5.
  5. Ali K, Cheng Q, Chen Z (2007) Multifractal power spectrum and singularity analysis for modelling stream sediment geochemical distribution patterns to identify anomalies related to gold mineralization in Yunnan Province, South China, Geochemistry: Exploration, Environment, Analysis 7:293-301.
    6.
  6. Bai J, Porwal A, Hart C, Ford A, Yu L (2010) Mapping geochemical singularity using multifractal analysis: Application to anomaly definition on stream sediments data from Funin Sheet, Yunnan, China, Journal of Geochemical Exploration 104:1-11.
    7.
  7. Carranza EJM (2008) Geochemical anomaly and mineral prospectivity mapping in GIS vol 11. Elsevier,
    8.
  8. Carranza EJM (2010) Mapping of anomalies in continuous and discrete fields of stream sediment geochemical landscapes, Geochemistry: Exploration, Environment, Analysis 10:171-187.
    9.
  9. Cheng Q (1999) Spatial and scaling modelling for geochemical anomaly separation, Journal of Geochemical exploration 65:175-194.
    10.
  10. Cheng Q (2004) A new model for quantifying anisotropic scale invariance and for decomposition of mixing patterns, Mathematical Geology 36:345-360.
    11.
  11. Cheng Q (2007) Mapping singularities with stream sediment geochemical data for prediction of undiscovered mineral deposits in Gejiu, Yunnan Province, China, Ore Geology Reviews 32:314-324.
    12.
  12. Cheng Q, Agterberg F, Ballantyne S (1994) The separation of geochemical anomalies from background by fractal methods, Journal of Geochemical Exploration 51:109-130.
    13.
  13. Cheng Q, Agterberg FP, Bonham-Carter GF (1996) A spatial analysis method for geochemical anomaly separation, Journal of Geochemical Exploration 56:183-195.
    14.
  14. Cheng Q, Xu Y, Grunsky E (2000) Integrated spatial and spectrum method for geochemical anomaly separation, Natural Resources Research 9:43-52.
    15.
  15. Deng J, Wang Q, Yang L, Wang Y, Gong Q, Liu H (2010) Delineation and explanation of geochemical anomalies using fractal models in the Heqing area, Yunnan Province, China, Journal of Geochemical Exploration 105:95-105.
    16.
  16. Ghasemi A, Talbot C (2006) A new tectonic scenario for the Sanandaj–Sirjan Zone (Iran), Journal of Asian Earth Sciences 26:683-693.
    17.
  17. Ghorbani M (2002) An introduction to economic geology of Iran, National Geosciences Database of Iran (NGDIR)
    18.
  18. Govett G, Goodfellow W, Chapman R, Chork C (1975) Exploration geochemistry—distribution of elements and recognition of anomalies, Journal of the International Association for Mathematical Geology 7:415-446.
    19.
  19. Harris J, Wilkinson L, Grunsky E, Heather K, Ayer J (1999) Techniques for analysis and visualization of lithogeochemical data with applications to the Swayze greenstone belt, Ontario, Journal of Geochemical Exploration 67:301-334.
    20.
  20. Hawkes HE, Webb JS (1962) Geochemistry in mineral exploration,
    21.
  21. Karimzadeh Somarin A (2005) Petrology and geochemistry of Early Tertiary volcanism of the Mendejin area, Iran, and implications for magma genesis and tectonomagmatic setting, Geodinamica Acta 18:343-362.
    22.
  22. Kürzl H (1988) Exploratory data analysis: recent advances for the interpretation of geochemical data, Journal of Geochemical Exploration 30:309-322.
    23.
  23. Li C, Ma T, Shi J (2003) Application of a fractal method relating concentrations and distances for separation of geochemical anomalies from background, Journal of Geochemical Exploration 77:167-175.
    24.
  24. Mandelbrot BB (1983) The fractal geometry of nature vol 173. Macmillan,
    25.
  25. Miesch A (1981) Estimation of the geochemical threshold and its statistical significance, Journal of Geochemical Exploration 16:49-76.
    26.
  26. Mohajjel M, Fergusson CL (2000) Dextral transpression in Late Cretaceous continental collision, Sanandaj–Sirjan zone, western Iran, Journal of Structural geology 22:1125-1139.
    27.
  27. Nabavi M (1976) An introduction to the geology of Iran, Geological survey of Iran 109
    28.
  28. Nazarpour A, Omran NR, Paydar GR (2013) Application of multifractal models to identify geochemical anomalies in Zarshuran Au deposit, NW Iran, Arabian Journal of Geosciences:1-13.
    29.
  29. Nazarpour A, Rashidnejad Omran N, Rostami Paydar Gh, Sadeghi B, Matroud F,  Mehrabinejad A (2015) Application of classical statistics, logratio transformation andmultifractal approaches to delineate geochemical anomalies in the Zarshuran gold district, NW Iran. Chemie der Erde 75: 117-132.
    30.
  30. Nazarpour A, Paydar G R,  Carranza EJM (2016) Stepwise regression for recognition of geochemical anomalies: Case study in Takab area, NW Iran. Journal of Geochemical Exploration 168: 150-162.
    31.
  31. Qiuming C (2000) Multifractal theory and geochemical element distribution pattern, Earth Science-Journal of China University of Geosciences 25:311-318.
    32.
  32. Rajabzadeh MA, Yazdani S, Nazarpour A, Ahmadi A (2015) Application Of Fractal Concentration-Area Method In Identification Of Geochemical Anomalies In Stream Sediments From Mazayejan Area, Suorian 1: 100000 Sheet, Fars Province. Geochemisry12:0-67.
    33.
  33. Sim B, Agterberg FP, Beaudry C (1999) Determining the cutoff between background and relative base metal smelter contamination levels using multifractal methods, Computers & Geosciences 25:1023-1041.
    34.
  34. Sinclair A (1991) A fundamental approach to threshold estimation in exploration geochemistry: probability plots revisited, Journal of Geochemical Exploration 41:1-22.
    35.
  35. Sinclair A (1974) Selection of threshold values in geochemical data using probability graphs, Journal of Geochemical Exploration 3:129-149.
    36.
  36. Sinclair AJ (1976) Applications of probability graphs in mineral exploration. Association of Exploration Geochemists, 4:123-136.
    37.
  37. Stanley CR, Sinclair AJ (1989) Comparison of probability plots and the gap statistic in the selection of thresholds for exploration geochemistry data, Journal of Geochemical Exploration 32:355-357.
    38.
  38. Tukey JW (1976) Exploratory data analysis. 1977, Massachusetts: Addison-Wesley
    39.
  39. Turcotte DL (1986) A fractal approach to the relationship between ore grade and tonnage, Economic Geology 81:1528-1532.
    40.
  40. Wang Q, Deng J, Liu H, Yang L, Wan L, Zhang R (2010) Fractal models for ore reserve estimation, Ore Geology Reviews 37:2-14.
    41.
  41. Wei B, Yang L (2010) A review of heavy metal contaminations in urban soils, urban road dusts and agricultural soils from China, Microchemical Journal 94:99-107.
    42.
  42. Xu Y, Cheng Q (2001) A fractal filtering technique for processing regional geochemical maps for mineral exploration, Geochemistry: Exploration, environment, analysis 1:147-156.
    43.
  43. Zheng Y et al. (2014) Analysis of stream sediment data for exploring the Zhunuo porphyry Cu deposit, southern Tibet, Journal of Geochemical Exploration 143:19-30.
    44.
  44.  Zuo R, Xia Q, Wang H (2013) Compositional data analysis in the study of integrated geochemical anomalies associated with mineralization, Applied Geochemistry 28:202-211.
    45.

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