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  Report on geochemical exploration in 1:100000 sheet of Zahedan Geological Survey of Iran 2005
Geochemical explor. in Zahedan
Report on geochemical exploration in 1:100000 sheet of Zahedan
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بعديآخرين
   Abstract
  
  
   The study area is located in 29? to 29?30' eastern longitudes and 60?30' to 61? northern latitudes and includes 1:50000 topographic maps of Zahedan 1, Sefidsang, Hajibaran and Safarabad.
   Geologically, this area is part of the Southeastern zone of Iran and the Nehbandan-Khash subzone. This sheet contains ophiolitic rocks. Stratigraphy studies indicate that there are no older rocks than Eocene and most common rock units in area are tectonic melange of basic to ultrabasic rocks alongside with serpentinized ultrabasic blocks, metamorphic rocks, plutonic bodies like granodiorite, tonalite, granite, quartz monzonite and metasediments that are locally schistose, sedimentary clastic and chemical rocks and alluvial deposits. Almost all of faults and fractures strike to northeast (N70E) and main faults probably are thrust and reverse faults.
   For an area, about 2500 km2, 549 geochemical samples were taken that according to suitable lithological conditions in the area, 553 samples were set for analysis of 44 elements including La, Zn, Cr, Mn, Ba, Au, Na, S, Zr, Hg, Ag, B, As, Co, Cu Cd, Te, U, Mg, Be, K, V, P, Li, Ca, Sc, Al, Fe, Ti, Sr, Tl, Cs, Ce, Bi, Y, Th, Sn, Rb, Pb, Nb, Mo, Sb, W and Ni. For control of analysis accuracy, we use Thompson control chart and relative error calculation. For deletion of lithological effect of enrichment index calculation, each one of variables was normalized according to the average of same class (classes were defined based on lithological differences and similarities). Data network estimation, uni- and multi-variable statistical processes like the correlation coefficient calculation, cluster analysis, feature analysis, factor analysis and etc objected on enrichment index data and results were interpreted, through which paragenesis complexes of elements were identified. Also univariable, factor analysis, feature analysis, and P.N. maps drawn by application of network estimation for raw data and enrichment index; as a result seven geochemically anomalous areas introduced by application of mentioned maps compilation.
  
 
 
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