(Sharqonj Sheet 1:100,000)
Executive: Mohammad Taqi Kore'i, (2003)
Sharqonj, located in Khorasan, is at longitude 58°-58° 30' E and latitude 33°-33° 30 N.
Its main access road is Khor-Seghale'-Ferdows dirt road.
Here are Sharqonj lithologic units by age:
- Jurassic silty-sandy shale (Shemshak Formation), limestone (Badamou Formation), marl-marly shale (Baghamshah Formation), basaltic andesite porphyry, limestone (Esfandiar Formation), lime sandstone and conglomerate;
- Lower Eocene conglomerate (Kerman Formation) and dacite sill;
- Middle Eocene tuffs, basic volcanics, acidic tuffs and other pyroclastics;
- Oligo-Miocene andesite associated with dacite lava, ignimbrite and red clastic beds;
- Neogene andesite underlain by conglomerate,
- Quaternary clay and salt flats
138 heavy mineral and alluvial samples were collected and analyzed. Then, following activities were done: statistical analysis of raw data, separation of rock groups, study on the clarkes of exposed rocks in the region, calculation of enrichment index, normalization, correlation and multivariate analysis. After that, anomalous areas were identified and their maps were prepared (34 sheets). Anomalies were determined using network estimation, factor analysis, heavy mineral and mineralization analysis. Finally, promising areas were identified.
Anomaly scoring was done in mineralized, heavy minerals and geochemical samples decreasingly.
Based on statistical parameters and field evidences, 4 areas (total 7) were identified as promising areas:
Mirkhash anomaly is about 100km2 (Daqe Kojun Sheet 1:500000). It includes more 30 old mine workings and slag traces and 4 copper indices. Zeolites are seen as old workings which are intensely altered in fractures and faults. Malachite, native copper, chromite and Chrysocolla are also found in old carvings.
Cd, Zn, Pb, Cu, Au, Ag anomalies were identified here. Mineralized samples have high content of Cu. Rock units include basic shoshonitic volcanics, pyroxene andesites, tuff breccias, pyroclastics and acidic tuffs.
2- Mount Palangi:
Mount Palangi anomalous area is about 20km2 (Northwest of Daqe Kojun Sheet1:50000). Its index is 5 and its rock units are tuff breccias, andesitic & pyroclastic tuff breccias, dicite sills and acidic tuffs.
Cu, Pb, Zn, Cd, As, Bi anomalies were identified. Mineralized samples are enriched in Cu and Zn. Also, mineralized samples show higher level of Hg, As than other samples. Heavy mineral samples have 2 gold grains.
Malachite is seen in carvings along silicic andesitic dykes.