Scientific Quarterly Journal of Geosciences

The Hired gold mineralization is located 140 km South of Birjand, Southern Khorasan, and north of Lut Block. In the area, the Jurassic and Cretaceous units are covered by Tertiary volcano-sedimentary sequences. Granite, granodiorite-quartzdiorite and gabbronorite bodies have ... Read More The Hired gold mineralization is located 140 km South of Birjand, Southern Khorasan, and north of Lut Block. In the area, the Jurassic and Cretaceous units are covered by Tertiary volcano-sedimentary sequences. Granite, granodiorite-quartzdiorite and gabbronorite bodies have intruded Tertiary sequences, and mineralization occurs within or at periphery of a subvolcanic granodiorite-quartzdiorite stock with porphyry texture. The existence of ilmenite within subvolcanic granodiorite-quartzdiorite bodies which the lack of magnetite and low magnetic susceptibility (1.5×10-4 SI Units) as well as low ratio of Fe2O3/FeO (<0.5), they are classified as ilmenite or reduced (low fO2) granitoid rocks. Mineralization in Hired area is divided into three main zones based on the distance from the stock. The mineralized zones are as follow: intrusion-hosted mineralization, proximal mineralization and distal mineralization. These three zones are different in host rock, mineralogy, alteration, structure, texture and metal assemblage. In the intrusion-hosted mineralization, the ore-bearing unit is subvolcanic granodiorite-quartzdiorite stock. Three types of major vein-veinlets observed within the stock, including vein-veinlets of tourmaline-quartz-sericite and sulfide (TQSS), quartz-calcite and sulfides (QCS) and quartz-calcite with rare sulfide (QC). The vein-veinlets include sheeted and stockwork arrays. The proximal mineralization occurs in volcano-sedimentary sequences. These sequences include tuff, andesite and conglomerate components. The sulfides occur as disseminated, vein-veinlet and massive textures. Stockwork and rarely sheeted vein-veinlets in this type of mineralization contain quartz, calcite and sulfides. Sericitization, silicification and carbonatization are the principal alterations associated with mineralization zone. The distal mineralization occurs in faults with low angle dips, trending NE-SW and NW-SE. These faults are filled with silica and carbonates, with iron oxides and hydroxides at the surface. The comparison of the most important characteristics of Hired mineralization (including tectonic setting, host rock, mineralogy, mineral paragenesis, ore content, structure, texture and alteration) with the characteristics of different types of gold mineralization suggests that the Hired gold mineralization shows most similarity with the gold mineralization related to reduced granitoid intrusion. This type of mineralization is reported for the first time from Iran.

Recognition of Original Carbonate Mineralogy and Determination of Ore Genesis in Robat Mine (Khomein-Arak) Carbonates

M.H. Adabi; M. Jamalian

Volume 17, Issue 66 , February 2008, , Pages 2-23

https://doi.org/10.22071/gsj.2008.57629

Abstract

The studied area is located at the middle structural zone of Sanandaj-Sirjan in Malayer-Esfahan axis. Lower Cretaceous sequence disconformably overlay the Triassic-Jurassic sequences. The sediments have been folded during Middle Cimerian (Bajocian-Batonian) and Laramian (Upper ... Read More

Hydrogeological and Hydrochemical Studies of Basaltic and Karstic Aquifers in Maku Area in Relation to Geological Formations

A. Asghari Moghaddam; E. Fijani

Volume 17, Issue 67 , February 2008, , Pages 2-13

https://doi.org/10.22071/gsj.2009.57748

Abstract

Maku area is located in the north of West Azarbaijan, northwest of Iran. In this area, groundwater supplies main water demands for different purposes such as drinking, agriculture and industry. The aim of this research is to study the groundwater hydrochemistry, hydrogeological relation between karstic ... Read More

Feasibility Study on Electrical Separator Efficiency Increment for Kahnooj Titanium Mineral Processing Pilot Plant

S. M. Javad Koleini; M. Abdollahy; M. Nasrabadi

Volume 17, Issue 68 , February 2008, , Pages 2-14

https://doi.org/10.22071/gsj.2009.57834

Abstract

In this paper, a study on efficiency increment (operation efficiency) of Kahnooj titanium pilot plant electrical roll separator with optimization of variable and effective parameters (crona voltage intensity, feed temperature and size distribution, rolls speed, ... Read More

Determination of Optimal Policy Making Regarding the Landslides around Villages using DSS, Case Study Barikan Landslide

J. Ghayoumian; S.M. Fatemi Aghda; O. Ataee; M.H. Davoudi; A.A. Norouzi

Volume 17, Issue 65 , March 2007, , Pages 2-11

https://doi.org/10.22071/gsj.2008.58164

Abstract

In this research a Decision Support System (DSS) has been used to support decision makers for policy making regarding the landslides which typically take place around villages. Definite software was utilized to design a model which include three strategies: landslide ... Read More

Partial Melting of Pelites and Semi-Pelites in the Kalaybar Thermal Aureole, NW Iran

M. Moazzen; R. Hajialioghli

Volume 16, Issue 64 , March 2007, , Pages 2-13

https://doi.org/10.22071/gsj.2008.58207

Abstract

Intrusion of the Kalaybar nepheline syenite and nepheline gabbro into the Cretaceous pelitic and calcareous rocks during Eocene-Oligocene has caused the development of a thermal aureole up to 1 km thick. The contact between igneous and country rocks is sharp. The ... Read More

Microstructural Evolution of the Mantle Lithosphere in the Khoy Ophiolites - NW of Iran

M. Rahgoshay; I. Monsef; H. Shafaii Moghadam; M. Mohajjel

Volume 16, Issue 63 , March 2007, , Pages 2-17

https://doi.org/10.22071/gsj.2008.58272

Abstract

Petrofabric, structural and geochemical study of the ultramafic tectonites in the Khoy ophiolitic complex suggest that these tectonites including low-temperature NW-SE shear zones cut the high-temperature to medium-temperature NE-SW mantle flow direction. Microstructures in these tectonites, record a ... Read More

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Volume 27, Issue 106 , March 2018, , Pages 2-2

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Volume 27, Issue 107 , June 2018, , Pages 2-2

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Volume 27, Issue 108 , September 2018, , Pages 2-2

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Volume 28, Issue 109 , September 2018, , Pages 2-2

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Volume 34 (2024)

Volume 33 (2023)

Volume 32 (2022)

Volume 31 (2021)

Volume 30 (2020)

Volume 29 (2020)

Volume 28 (2019)

Volume 27 (2018)

Volume 26 (2017)

Volume 25 (2016)

Volume 24 (2015)

Volume 23 (2014)

Volume 22 (2013)

Volume 21 (2012)

Volume 20 (2011)

Volume 19 (2010)

Volume 18 (2009)

Volume 17 (2008)

Volume 16 (2007)

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