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Exploration in Bafq
Geochemical Exploration in Bafq (Bafq Sheet 1:00,000)
 
  Page 1
 
   By Alavi Naeini, Fazayeli, Alipour, Moshkani (2003)
   Bafq is located in western Esfordi and at longitude 55 - 55 30' W and latitude 31 30' - 32 N.
   Geological history of the study area: The oldest rocks are Early Precambrian in age and belong to Boneh Shour complex. During Infra-Cambrian, Rizu Series was formed. Then, Laloun- Zaygun formations were formed in the Cambrian period and sandstone, shale, and limestone were deposited during Late Devonian to Early Carboniferous. Other types of lithologic units include Jamal Limestone (Permian), Shemshak sandstone & shale, Badamu Limestone, conglomerates associated with Precambrian rock fragments, and early cretaceous marl, sandy limestone and shale. Paleogene is represented by volcanics and sedimentary volcanics, Neogene by conglomerates, marls and sandstones (decrease of volcanic activities) and finally the Quaternary period by alluvial deposits, conglomerates, and desert soils. The beginning of volcanism periods was marked by Precambrian and Infra-Cambrian volcanic activities which led to the formation of keratophyre, basalt, spilite, and serpentinite. Later volcanic activities produced gabbro dioritic sills and stocks, Narigan porphyry granite, and E-W microdiorite-trachyandesite and dioloritic dikes. Finally, the end of volcanism periods was represented by Paleogene volcanic activities.
   Angular unconformity with Precambrian- Cambrian sediments shows the beginning of the tectonic events in the study area (simultaneous with Assyntian orogeny). Also absence of Ordovician- Silurian and early Devonian sediments suggests early Paleozoic epeirogenesis and late Paleozoic progression.
   400 geochemical samples were collected and after related analysis and studies, some anomalous areas were introduced for further exploration.
    Statistical studies include mono-variable statistical analysis (calculating statistical parameters and drawing histograms and abundance diagrams of raw data, normalization), calculating correlation coefficients, and multi- variable statistical analysis.
   Promising areas were introduced based on 25 provided anomaly maps and field evidences, studies on previous determined areas and also Choghart mine.
   In the northwesternmost part of the study area (northwestern Darreh Anjir sheet 1:50000) strong copper anomaly and weak lead and zinc anomaly on red layers of sandstone and conglomerate (Neogene) and Quaternary deposits are found.
   Iron is found in two areas: 1- northwest of the study area- center of Chahdough sheet 1:500000- located on quaternary sediments and Infracambrian and Boneh Shour formations; 2- close to Choghart mine on Boneh Shour complex.
   The first area should be studied and surveyed more carefully because of closeness to argillite and argillite- limonite alterations.
   Apatite mineralization is seen in the center of Chahouk sheet 1:50000, but it is not first-order anomaly. It is mainly located on marbled limestone and lenticular sandstones (Cretaceous).
   Other anomalies in this sheet: 2 first-order cobalt anomalies, 2 first-order Chromite anomalies, 3 first-order lead anomalies, 5 first-order vanadium anomalies.
   Regarding large amounts of sensor data available for important elements such as silver, bismuth, cadmium, molybdenum, arsenic, antimony, tin and tungsten, reanalysis of these elements using a high-sensitivity analysis method seems necessary. Furthermore, analysis of these elements is essential due to the importance of rare earth elements in phosphor ore deposits and occurrence of alkaline igneous rocks with a carbonatitic trend in the study area.
 
 
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