Geochemical Survey in the Iranshahr sheet of 1:100000
The study area is located in the Sistan and Baluchestan Province between 60 30' to 61 E and 27 to 27 30' N. It is within the 1:250000 quadrangle of Iranshahr and includes four 1:50000 sheets of Daman, Baghchah, Abtar and Iranshahr.
From geological viewpoint this zone is located in the Southeast Iran and Jazmurian subzone that contains siltstone, mudstone, conglomerate, sandstone, limestone, colored melange, diabase, gabbro, flysch and spilite. Faults are mainly longitudinal and concentrated in the eastern portion of the sheet where the Eocene flysch exist.
Stream sediment sampling network was designed on the base of weight center of drainage basins. We used topography maps and aerial photographs plus to other datasets for determination of sampling points. Finally 489 point was designed to be sampled in the 2500 Km2 area. Only 443 samples were taken because of accessibility and security problems. The samples were sieved by 80 mesh. 100 grams of samples selected and milled to 200-mesh; part of them was archived and the rest sent to the laboratory.
All samples were analyzed for 22 elements including Pb, Ni, Mo, Sn, Sg, Co, Cu, B, Zn, Cr, Bi, Ti, Mn, Se, Sr, Ba, Au, As, Sb, Be, Hg and W. Au was measured by atomic absorption and other elements by ICP Mass methods.
After obtaining the data, processing and interpretation, 16 anomalies were identified that should be checked in the field. We used heavy mineral sampling method. 62 heavy mineral samples were taken from the area. After compilation of available data, two zone were introduced as promising zones for further exploration.
Anomaly no 1:
It is located at west of Sursamdin river of Baghchah in the 1:50000 sheet of Baghchah. The litology of the area includes sandstone and conglomerate with anomalous elements of Co, Ti, Cr, Sn, Zn, Mo, Pb and Mn. The area contains heavy minerals such as rutile, anatase, apathite, martite, garnet, barite, zircon, corundum, leucoxene, gold and ilmenite. Hematitic and limonitic alterations also exit. It is suitable for placer type deposit.
Anomaly no 2:
At Makanshahi, north of the Kurchur river, there is exposure of the conglomerate and gabbro which shows anomaly of Co, Cu, Mo, Ti, Sr, Mn and Au. Heavy minerals include anatase, ilmenite, garnet, pyrite oxide, oligist, zircon, cinnabar, barite, sphene, martite, rutile, leucoxene, viterite, corundum and gold.