Geochemical anomaly separation by multifractal modeling in Kahang (Gor Gor) porphyry system, Central Iran

Afzal, Peyman, Khakzad, Ahmad, Moarefvand, Parviz, Omran, N. Rashidnejad, Esfandiari, Bijan and Alghalandis, Younes Fadakar (2010) Geochemical anomaly separation by multifractal modeling in Kahang (Gor Gor) porphyry system, Central Iran. Journal of Geochemical Exploration, 104 1-2: 34-46. doi:10.1016/j.gexplo.2009.11.003

Author Afzal, Peyman
Khakzad, Ahmad
Moarefvand, Parviz
Omran, N. Rashidnejad
Esfandiari, Bijan
Alghalandis, Younes Fadakar
Title Geochemical anomaly separation by multifractal modeling in Kahang (Gor Gor) porphyry system, Central Iran
Journal name Journal of Geochemical Exploration   Check publisher's open access policy
ISSN 0375-6742
Publication date 2010-01-01
Year available 2009
Sub-type Article (original research)
DOI 10.1016/j.gexplo.2009.11.003
Volume 104
Issue 1-2
Start page 34
End page 46
Total pages 13
Place of publication Amsterdam, Netherlands
Publisher Elsevier BV
Language eng
Abstract Geochemical anomaly separation using the concentration-area (C-A) method at Kahang (Gor Gor) porphyry system in Central Iran is studied in this work. Lithogeochemical data sets were used in this geochemical survey which was conducted for the exploration for Cu mineralization in dioritic and andesitic units at Kahang Cu-Mo porphyry system. Similar surveys were also carried out for Mo and Au exploration in these rock units. The obtained results have been interpreted using rather extensive set of information available for each mineralized area, consists of detailed geological mapping, structural interpretation and alteration data. Anomalous threshold values for the mineralized zone were computed and compared with the statistical methods based on the data obtained from chemical analysis of samples for the lithological units. Several anomalies at a local scale were identified for Cu (224 ppm), Mo (63 ppm), and Au (31 ppb), and the obtained results suggests existence of local Cu anomalies whose magnitude generally is above 1000 ppm. The correlation between these threshold values and ore grades is clearly interpreted in this investigation. Also, the log-log plots show existence of three stages of Cu enrichment, and two enrichment stages for Mo and Au. The third and most important mineralization event is responsible for the presence of Cu at grades above 1995 ppm. The identified anomalies in Kahang porphyry system, and distribution of the rock types, are mainly monzodiorite and andesitic units, do have special correlation with Cu and monzonitic and dioritic rocks, especially monzodioritic type, which is of considerable emphasis. The threshold values obtained for each element are always lower than their mean content in the rocks. The study shows threshold values for Cu is clearly above the mean rock content, being a consequence of the occurrence of anomalous accumulations of phyllic, argillic and propyllitic alterations within the monzonitic and dioritic rocks especially in monzodioritic type. The obtained results were compared with fault distribution patterns which reveal a positive direct correlation between mineralization in anomalous areas and the faults present in the mineralized system. © 2009 Elsevier B.V.
Keyword Geochemical anomaly
Porphyry system
Concentration-area method
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Available online 26 November 2009. Erratum: Vol 105, Iss. 1-2, pp. 50.

Document type: Journal Article
Sub-type: Article (original research)
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Created: Sun, 21 Mar 2010, 10:05:23 EST