Systematic geochemical exploration in 1:100000 sheet of Sarchahshour
This sheet is located in Khorasan province, between 58? 30' to 59? eastern longitudes and 32? to 32?30' northern latitudes. Regional lithology includes limestone with sandstone and shale intercalations that covered by Upper Cretaceous phyllites and flysch zone volcanics and colored melange (serpentinized ultrabasics and listvenite), gabbro, diabase, shale, radiolarite, chert, Paleocene limestone, conglomerate, marl, Eocene dacite, basalt and breccia, and quaternary alluvial fans and deposits. The dominant trend is NW.
The project was conducted by analyzing 574 geochemical samples. Statistical processes include censored data processing, rock classification, fuzzy logic and cluster analysis. Finally 15 maps produced and anomalies were identified.
The anomalies ranked by credits:
(1) Credits more than 10%
(2) Credits between 5% and 10%
(3) Credits less than 5%
Among five anomalies, one area has high credits and valuable model. It is located at 1:50000 sheet of Hamoun and southeast of Hanich. Its model correlates with epithermal Sado-type gold deposit. Dominant rocks in the zone involve andesite, pyroxene andesite and dacite with silicis and hematitic alterations.
Other anomalies include:
Anomaly 2- located in southwest of Qa'emabad village, west of Hamoun sheet. Dominant rocks are amphibole schist, metagabbro, metadiabase, amphibolite and gneiss.
Anomaly 3- located in southwest of Sarchah village and southwest of Hamoun sheet. Existing rocks include metagabbro, metadiabase, amphibolites, gneiss and ultrabasic rocks with serpentinic alteration.
Anomaly 4- located in north of Chah Shamdan village and south of Sarchahshour sheet. Available rocks involve pyroxene andesite, sericite chlorite schist with aplitic veins.
Anomaly 5- located in north of Roud-e Karamali village, southeast of Sarchahshour sheet; the lithology includes pyroxene andesite and andesite porphyry.