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Explorations in Chahdashi
Report on the Systematic Geochemical Explorations in Chahdashi Sheet (1:100.000)
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بعديآخرين
   Exploration Project of Minerals in South of Khorasan
   February 2001
  
  
   This sheet is located in South Khorasan Province at longitudes 59?30' to 60?E and latitudes 31? to 31?30' N.
   In this region the igneous, metamorphic and sedimentary lithology units related to Precambrian to Neogene have outcropped. The oldest unit is the Precambrian unit (metamorphosed acidic volcanic rocks, mica schist and amphibole schist) that outcrops as a narrow zone in the west of the sheet. Schist, hornfels, sandstone, shale, limestone, phylite and sleet, pegmatite, granite and granodiorite of Jurassic, gabbro, diorite, granite, gneiss, serpentinite, shale, limestone and sandstone of Cretaceous, tuff and volcanic rocks, marl and limestone of Eocene, granite, andesite and basalt of Eocene-Oligocene, marl, sandstone and conglomerate of Oligo Miocene and Paleocene, alluvium, loess and basalt of Quaternary can be referred to as other outcropped rocks of the area.
   In this sheet, 652 geochemical samples were taken and analyzed for 21 elements of Co, Sc, Cd, Y, V, Cr, Ni, Mn, Sr, Ba, Au, As, Sb, Bi, Hg, Cu, Pb, Mo, Sn, Ag, Zn. In the statistical calculations, firstly statistical parameters related to raw data were calculated, after that lithology homogenized communities were separated and each one was normalized in proportion to the mean values of the same community for obtaining the values of elements' enrichment index for every sample. Then enrichment index data was normalized. By means of monovariable and multivariable statistical techniques like elements' correlation coefficient, cluster analysis and factor analysis, the data was analyzed and monovariable maps were drawn using network estimation technique. In addition, anomalous areas resulting from factor analysis method were specified.
   Heavy mineral sampling was done in the area of preliminary geochemical anomalies and then its data was processed and anomalous areas were indicated using the network estimation technique. Areas introduced in geochemical and heavy mineral methods as anomalous areas were merged and as a result 15 regions with an area of about 280.5 km2 were introduced as final anomalous areas. Finally based on the modeling of the anomalies four priorities were presented for this sheet. Forty map sheets have also been provided in this study.
  
   The following is the identified anomalies:
  
   1- Anomaly of Sinad mountain area with upstream rocks of phylite, garnet schist, sleet, granite, pegmatite and metamorphosed sandstone as well as the anomalies of Ba, Co, Zn, Cu, Sb, Bi, Ag and V.
   2- Anomaly of eastern area of Sinad mountain with upstream rocks of schist, hornfels, sandstone with lime lens, phylite, sleet and gabbro, hematitic, propylitic siliceous, kaolinitic and argillic alterations as well as the anomalous elements of Cd, Sr, Cu, As, Zn, Hg, Cr, Ni, W.
   3- Anomaly of southeast area of Sinad mountain sheet with upstream rocks of schist, metamorphosed sandstone, conglomerate, phylite, sleet, granodiorite, gabbro and propylitic and argillic alterations as well as the anomalies of Cd, Sb, Ba, Hg, Ag, Cu and Y.
   4- Anomaly of the centre of Janoob-e Sinad Mountain sheet with upstream rocks of granite, marl, nummulite limestone and conglomerate as well as the anomalous elements of Sb, Ba, W and Hg.
 
 
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