JOURNAL OF ECONOMIC GEOLOGY
Year:2019 | Volume:11 | Issue:3 (22) |Papers Count:10

Introduction: According to Hitzman et al. (2005) and Hayes et al. (2015), the sediment-hosted copper deposits (SHC) are stratiform disseminated to veinlet copper mineralization within the reduced black shale, sandstone, and carbonate rocks. These deposits have formed during the middle-late Paleoproterozoic (e. g., Udokan, Russia: Volodin et al. 1994, Yinmin, South China: Zhao et al. 2013) to Tertiary (e. g., Corocoro, Bolivia: Flint 1989). The SHC deposits, frequently labeled as “ stratiform” or “ stratabound” and/or “ diagenetic” deposits have been subdivided into three types (Cox 1986, Cox et al. 2003, Hitzman et al. 2005): 1-reduced-facies (RF), 2-Redbed (RB) and 3-Revett (RV)....

Introduction: More than 300 sediment-hosted Zn– Pb deposits and occurrences have been recognized in Iran (Rajabi et al., 2013). Most of these deposits are concentrated in the Central Alborz, Tabas-Poshte-Badam, Malayer-Esfahan and Yazd-Anarak metallogenic belts (Rajabi et al., 2012). Several Pb– Zn deposits and occurrences such as Tarz, Tappeh-Sorkh, Deh-Askar, Abheydar, Gicherkuh, Ahmadabad (BonehAnar), Gujer, Karvangah, Tajkuh, Magasou and Gavar (Javar) occur in Kuhbanan-Bahabad area in the Central Iran zone. The Tarz deposit is situated about 15 km east of the Kuhbanan city in the Tabas-Posht e Badam metallogenic belt.

Introduction: The mineralogical and textural characteristics of rock materials have an important influence on physico-mechanical properties. The effects of some textural characteristics like grain size (Brace, 1961), grain shape (Cox and Budhu, 2008), grain surface (Diepenbroek et al., 1992), grain size distribution (Gurkan Ozgurel and Vipulanandan, 2005), and grains interlocking (Hoek, 1965) on physico-mechanical behavior of rock materials has always been emphasized. On the other hand, it has been found that textural properties are originally controlled by the mineralogy and chemistry of rock materials (Locat et al., 1984).....

Introduction: All of the major tectonic zones of Iran, except for the Kopet-Dagh, contain Pan-African crystalline basement. Subduction of the Proto-Tethys at about 630 Ma caused Cadomian arc– and backarc magmatism in the northern margin of Gondwana (Hassanzadeh and Wernicke 2016). Sanandaj-Sirjan Zone with NW-SE trend is the most active zone in Iran that extends to the southeast of Turkey and then to Bitlis Massif. There are many similarities between the Precambrian basement in the zone from Iran with Bitlis and Menderes massifs from Turkey.

Introduction: Located in the NE Iran, the early Tertiary volcanic sequences host a vast stratabound Cu mineralization (manto type), which is likely to be significant economically (Samani, 2002). The Pirmardan copper deposit is located 130 km southwest of Shahrood and is classified as a manto type mineralization, hosted by altered andesite to trachyandesite, volcanic breccia and tuff. The host rock suffers from two kinds of local and regional hydrothermal alterations of sericitecarbonate, and propylitic, respectively. Sulfide minerals occur as disseminated vein and veinlet forms in the host rock. Manto mineralization type in the northeast and central Iran could be a new prospective for the copper deposits subsequence of the Cu porphyry deposits in Iran (Samani, 2002).....

Introduction: The Khunik gold prospecting area is located 106 km south of Birjand, in the Khorasan Jonoubi province. The Khunik area is located in a strategic part of the Lut Block that includes many instances of mineralization such as the Qaleh Zari IOCG deposit (Karimpour et al., 2005; Richards et al., 2012), the Maherabad porphyry-type Cu-Au (Malekzadeh Shafaroudi et al., 2010, 2015), the Cu porphyry type of Dehsalm (Arjmandzadeh, 2011), the Kooh-Shah (Abdi et al., 2010) and the Hired intrusion-related (reduced type granitoid) gold deposit (Karimpour et al., 2007)....

Introduction: The Dohneh copper deposit is located northeast of Zanjan within the Tarom subzone and the western Alborz-Azarbayjan magmatic belt. There are several reports of copper mineralization in the Tarom region such as the Aliabad Mousavi-Khanchay Cu deposit (Saeedi, 2015), the Lolan Cu-Au deposit (Zamanian et al., 2016), the Mari Cu deposit (Hosseinzadeh et al., 2016) and the Gheshlagh Cu deposit (Abbaspour, 2017) which make this subzone an important metallogenic zone in Iran. Prior to the present research, there was no detailed study done on the Dohneh Cu deposit. Thus, the aim of this research is to present detailed characteristics of geology, mineralogy and geochemistry of the host rock as well as the origin of Cu mineralization in the Dohneh area. The results of this study can be considered as an exploratory pattern in the Tarom-Hashtjin metallogenic belt in terms of time and space.

Introduction: The majority of recent works accept that agates are formed at temperatures <100° C (Moxon and Reed, 2006) and consist of a variety of silica minerals. The Reza Abad agates are located 150 km from SE Shahrood in the northern parts of Central Iran structural zone with geographic coordinates of 56° 25′ 22. 52″ to 56° 47′ 2. 50″ E longitudes and 35° 55′ 32. 68″ to 36° 07′ 5. 54″ N latitudes. The area is a part of the magmatic belt of northern Central Iran, containing a main period of magmatic activities from Eocene to late Miocene in a subduction related volcanic arc setting (Ghasemi and Rezaei-Kahkhaei, 2015). Analyses of the distribution of trace elements and stable isotopes should provide important information concerning the geochemistry of agate and genetic aspects of agate formation. Therefore, in this study, we tried to study the geochemical characteristics of Reza Abad agates, the origin and formation temperature based on the oxygen stable isotope data.