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  Geological Survey of Iran
Geochemical Explora. in Arak
Report on geochemical exploration in 1:100000 sheet of Arak
 
  Page 1
 
   Report on geochemical exploration in 1:100000 sheet of Arak
  
   ?Abstract
   The 1:100000 sheet of Arak is located in the Markazi province between 49?30' to 50? eastern longitudes and 34? to 34?30' northern latitudes. According to the structural divisions of Iran, the study area belongs to the Sanandaj-Sirjan (south and west) and Central Iran zones.
   Oldest rock units of area are Jurassic shale and sandstone that are covered by clay limestone of Cretaceous, Qom and Upper Red formations, Oligo-Miocene andesite, basalt and volcanic rocks and Pliocene volcanic conglomerate. There are three small intrusive bodies in the area, granodiorite-diorite in composition. Regional metamorphism of Sanandaj-Sirjan is evident in metadolomites and schists of the area. The Main structural trend is NW-SE including Talkhab and Tabrateh faults.
   In this survey 448 stream sediment samples were taken and analyzed for 44 elements. Data processing includes separation of rock classes, determination of background, threshold and anomaly values, processing censored data and cluster analysis, network estimation and calculation of enrichment index etc. As the result these anomalies were identified: three Co anomalies, sic Pb anomalies, six Zn anomalies, seven Ti anomalies, 10 V anomalies, three Ag (3.5 Km away from east of Moradabad, 1 Km away from north of Jahak mountain and 1.5 Km away from northeast of Anjirak), two Bi anomalies, two Au anomalies (south of Dayen village and 2 Km away from east of Mehrabad village) and 6 Hg anomalies. Also there are other anomalies for Be, S, Sb, Sn, Sr, Te, Th, Tl, V, W, La, Mo, Co, Ce, Cd, Ba and As.
   In the project these maps were prepared: geochemical map of factor score distribution, occurrences probability cross total number of samples, and enrichment index map. In addition 55 heavy mineral and 24 mineralized samples were taken from the area that contain rutile, pyroxene, pyrite, limonite, barite, pyrolusite, ilmenite, hematite, oligist and zircon. Mineralized samples show evidence of tourmaline, gold, tungsten, copper and tin. Based on above data, these variables were defined:
   1- First group: assemblage of barite, zircon, rutile, hematite, ilmenite, pyroxene and oligist
   2- Second group: include limonite and pyrolusite
  
   Following processing of data, of six anomalous zones, four one were modeled.
  
    Priority I
   Anomaly no 2: this anomaly is located in the eastern part of 1:50000 sheet of Shahveh. This zone has found a score of 13.3% for Pb-Zn skarn deposits.
  
   Priority II
   Anomaly no 3: This anomaly is located in 1:50000 sheet of Arak, west of Arak county. It found a score of 9.5% for Fe skarn deposit.
   Anomaly no 4: this anomaly is located in 1:50000 sheet of Arak, south and southeast of Kouhroud village. Sedimentary manganese gained the score 5.5% for this anomaly.
  
   Priority III
   Anomaly no 6: This anomaly is located in 1:50000 sheet of Arak, near Hazaveh village. First model of this zone is replacement-type manganese deposit with 4.9% points.
   The final report of project also includes an environmental and agricultural assessment of geochemical data. The result of this assessment can be summarized here:
   Al enrichment is evident in south of Shahveh, northwest of Arak and west of Mashhad-Alkoubeh sheets.
   Ca enrichment was seen in east of Shahveh and center of Mashhad-Alkoubeh sheets.
   Fe enrichment in north of Davoodabad sheet.
   K enrichment in east of Arak and north of Mashhad-Alkoubeh sheets
   Mg enrichment in center of Shahveh sheet
   Na enrichment in center and east of Davoodabad, north of Shahveh and east of Mashhad-Alkoubeh sheets
   P enrichment in center of Shahveh, northeast of Arak and south of Mashhad-Alkoubeh sheets
   S enrichment in north of Shahveh sheet
  
 
 
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