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  Semi-Detailed Mineral Exploration in Qaen, Geochemical and Geological Exploration in Vorezg Zone
Exploration in Vorezg
Geochemical and Geological Exploration in Vorezg Zone
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بعديآخرين
   Abstract
  
   Contract of semi-detailed mineral exploration in Qaen was signed between Industries and Mines Organization of South Khorasan and Zarnab Ekteshaf Consulting Engineers in 2005 (Contract No. 1031/85/2544). An important section of the contract was assigned to geochemical exploration and preparation of geological maps of 6 selected zones including Vorezg. Vorezg Exploration Zone about 24 km2 is located at 25km of E and SE of Qaen and divided into 3 northern, southern and central parts.
   Preparation of 1:5000-scale geological maps and geochemical exploration utilizing stream sediments, heavy minerals and mineralized samples were carried out.
   Vorezg zone is in the Flysch Zone of E Iran. Its main rock units dating back to Paleocene-Quaternary are
   - Intermediate-basic volcanic and pyroclastic rocks including andesite, andesitic basalt, trachybasalt, tuff and agglomerate. Volcanic rocks of the area date back to eruptions of the Paleocene.
   - Sedimentary rocks including shale, marl and conglomerate (Eocene)
   - Old and young (Quaternary) terraces
   In the eastern part of Qaen, there is Rud-e-Shur fault system. Its major faults trend N-S, but their interference with NW-Se and NE-SW trending faults make the system more complex. Vorezg zone is also located on Rud-e-Shur fault system. Its faults have four different trends. Their maximum apparent horizontal movement and maximum length are 100m and 3km respectively.
   In the western part of Qaen, there are some dikes trending NW-SE and NNW-SSE. They follow the trend of faults which indicate their tensional action. Chlorite and hematite alteration zones are confined to inter-fault zones. Contact zone of rock units is constrained to faults, so faulting has an important role in the location of alterations, dike intrusion and contact of units. Faulting dates back to Eocene-Quaternary.
  
    For preparing thin sections and petrographic studies, 13, 9 and 3 samples were collected from northern, central and southern parts respectively. 2, 1 and 2 samples were respectively taken from northern, central and southern parts for ICP analysis. Also, 2 samples were collected from the central part for mineralographic studies.
   Field evidences showed malachite mineralization in two units of megaporphyry andesitic basalt (PEmp2) and green andesite basalt (PEgab) in Northern Vorezg. Also, several Cu indexes associated with andesitic to andesi-basaltic lava were found in the eastern and western parts of Central Vorezg.
   Cu mineralization (dark color) was found in the andesitic basalt unit in the western part of Central Vorezg. Maximum amount of Cu mineralization and malachite occurrence was near the western contact zone of the andesitic basalt unit and Evsm & PEcvt units. Cu mineralization was seen as small veinlets and disseminated grains of natural copper, cholite, bornite, chalcocite, digenite and hematite. Under surface conditions, all primary elements were changed into malachite, so only malachite was found in hand specimen.
 
 
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