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Journal Geosciences 31-32
 
Subject: Geology Type: Journal

Author: F. Sahabi, KH. Bahar - Firouzi, A. Yaqubpour and M. Mehrpartou, M. Mohajjel and M.R.Sahandi , Lasemi and A.kheradmand , F.Golshani & M.Bahrammanesh , B.Rezai, A.Amini & M.Sabaghol , H.Safari , M. Qorashi and M.R.Ghasemi

 President: Eng. M.T.Koreie Chief Editor: Dr. M.Ghorashi
Editorial Board: S.A.Aghanabati, MH.Emami, M.Berberian , M.Alavi Naini , F.Shahabi, H.Memarian ,K.Seyed Emami (Tehran University), Eng .M.Shahrabi , M.A.Naeni, M. Ghorashi , M.R. Gheytanchi , M.H. Karimpour , M. Lotfi
Publication Date: 1999  Publication No: 31-32Pages Number: 100 Pages, Pics, Maps
Abstract

Sabalam Volcanic Complex with special reference to the hydrothermal resources in Meshkinshahr area , NW.Iran
   Supergen alteration and enrichment of Sungun Copper – Molybdenum Porphyrtic deposit, North –east Iran
   Tectonic evolution of Sanandaj – Sirjan Zone
   Facies , depositional environments , and sandstone provenanceof the Hojedk Formation in Zarand area, Northwest kerman
   Late Permian Brachiopoda of Minak and Niknamdeh Sections , Baladeh area, Central Alborz
   The optimization of effective parameters in beneficiation of Sarcheshmeh copper mine
   Deformations analysis of Sabz – Pushan Fault zone
  
   Sabalam Volcanic Complex with special reference to the hydrothermal resources in Meshkinshahr area , NW.Iran
   Abstract
   Volcanic activity in Sabalan started in Eocene and resumed in Pliocene by erruption of trachy – andesitic andesitic lava flow through the main caldera. Four major lithostratigraphic units were defined in the studied in the studied area in the following order:
  
   Dizu Formation (Quaternary alluvium and terraces). Kasra Formation (post-caldera, Late Pliostocene), Taos Formation (syn-caldera, Early plistocene) Valhazir Formation (pre-caldera, Pliocene).
   The Sabalan Volcanic Complex, structurally consists of:
   - A central caldera of 14 x 12 Km, partially filled by post- caldera-trachyandesite – trachydacite lava flows.
   - Linear faulting trending NE-SW, N-S and WNW-ESE.
   - Arcuate structures forming an inner and outer fractures to the caldera.
   Resistivity measurements (DC,TEM and Mt) was carried out to identify subsurface resistivity anomalies. Five significant anomalies (5-10 ohm. m) were defined as follows:
   - Gheynarjeh (NW.Sabalan)
   - Dollar (SE.Sablan)
   - Toas – Hooshang Meidan(WNW.Sabalan)
   - Ghotur Suii )N.Sabalan)
   - Sar – e ein (SE Sabalan)
   The main hydrothermal alteration exposed at the surface is confined to the valhazir (pre – caldera) formation and is of two types.
   - Low temperature alteration developed in the vicinity of the surface thermal springs, e.g., Gheynarjeh.
   Alteration, indicative of pre-existing hydrothermal system, in which temperature was at least 180o C.
  
  
   Supergen alteration and enrichment of Sungun Copper – Molybdenum Porphyrtic deposit, North –east Iran
   Abstract
   The Sungun deposit is situated in Alborz-Azarbayejan magmatic belt, northwest Iran. This deposit is a skarn porphyritic copper-molybdenum type which skarn member had been exploited from ancient time, but the porphyic part has been intruduced first by H. Etminan (1977). The principle agent of mineralization is a subvolcanic stock with granodioritic composition that disseminated veinlet mineralization occurred in it and in skam member adjacent of it.
   Potassic – Phyllic, Phyllic- Carbonate, argillic and propylitic alteration, characteristic of continental margin type porphyry copper deposits is well mapped. Twokinds of Potassic alteration, in adjacent to skam (wtihout mineralization) and in deep part of deposit (with a good disseminated and veinlet mineralization) is distinguished. Phyllic alteration ocurred in north and south of deposit.
   Supergen enrichment processes is not well developed in Sungun and secondary sulfide minerals of copper is formed only as thin film around or in the fractures of primanuy sulfide mineral in upper parts of deposit.
   Chemical and mineralographical investigation of smaples from supergen zones, that recorded in logging files of boreholes show that the typical supergen ore is formed in a few meter thickness (<5m) in some places, then the supergen reserves of Sungun deposit is very low (Probably < 10 m.t.).
  
  
   Tectonic evolution of Sanandaj – Sirjan Zone
   Abstract
   The Sanandaj – Sirjan Zone is the metamorphic coure of the Zagros Orogen in south – wdstern Iran. It is formed in the Late cretaceous, during closure of the Neo-Tethys, and when Afro-Arabian Continent colliede with central Iran. Subdivision os Proposed for the sanandaj-Sirjan Zone is based on the recognition of Late Mesozoic Continental margin arc, being formed during northeastward subduction of Neo-Tethys under Iranian continent. From southwest to northeast the subdivision consists of the following subzones.
   1- The radiolarite sub-zone, consisting of Late Triassic to Late Cretaceous shallow to deep-marine rocks.
   2- The Bistoon sub-zone, constituting Late Triassic to Late Cretaceous shallow marine carbonates.
   3- The Ophiolite sub-zone comprising several Late Cretaceous ophiolites.
   4- The marginal sub-zone has a Late Jurassic-Early Cretaceous volcanic arc succession deposited in shallow-marine environments.
   The Complexly-deformed sub-zone has a Late Palaeozoic-Mesozoic Passive margin succession formed at the northeastern side of Neo-Tethys, as well as being overlain by a convergent margin assemblage. Two regoinal deformations are recognised in the Complexly – deformed sub-zone with the first one related to subduction of Neo-Tethyan oceanic crust and associated with arc volcanism during the Late Jurassic-Early Cretaceoos. The second regional deformation occurred int Late Cretaceous collision and consists of southwest –vergent intense folding in the metamorphic inner sub-zone and imbricate thrusting in the outer sub-zone . collisional tectonics in a regime of dextral transpression was renewed in the Neogene.
  
  
   Facies , depositional environments , and sandstone provenanceof the Hojedk Formation in Zarand area, Northwest kerman
   Abstract
   The Hojedk Formation (Middle Bajocian –Lower Bathonian) is a thick, mainly siliciclastic and coal-bearing succession, in the Zarand area, northwest Kerman. It thickens along the Kuhbanan Fault, where its thickness exceeds than 1000 meters. The lower contact of the Hojedk Formation is gradational with the Badamu Formation. Its upper contact with the basal conglomerate of the Bidou Formation is an erosional unconformity.
   The purpose of this study is facies analysis, recognition of depositional environments and sandstone provenance of the Hojedk Formation in the Zarand area. This area is a part of a “pull apart basin” developed between Nayband and Kuhbanan strike – slip faults during Middle – Late Jurassic time.
   The lower portion of the Hojedk Formation was deposited in a river dominated delta, but the main part of the formation (middle and upper portion) was deposited in a meandering river environment. The sandstones of the Hojedk Formation are mainly phyllarenite, in which over 50% of the grains are low-grade metamorphic rock framents. The north – northwest to south-southeast paleocurrent direction and northward increase in grain size, along the Kuhbanan Fault. Indicate a north to northwest source for the siliciclastic rocks of the Hojedk Formation.
  
  
   Late Permian Brachiopoda of Minak and Niknamdeh Sections , Baladeh area, Central Alborz
   Abstract
   The Upper Permian brachiopods of Baladeh area, central Alborz were compared and correlated paleogeographically and paleoecologicaly with shahreza – Abadeh region, central Iran, as well as Jolfa, northwestern area of Iran.
   In order to reach a satisfactory conclusion, numerous brachiopods (200 specimens) from two sections, i.e., Minak and Niknamdeh respectively.
   Systematic descriptions of the brachiopods were carried out at generic and specific levels, these are indicated in the text accordingly. As a result of this investigation, during the Permian- Triassic times, Alborz shared a very similar paleogeographic realm with Shahreza – Abadeh Belt, as well as Jolfa region.
   Many identical brachiopod genera and species of the three above-mentioned areas, as well as similar lithology, are indicative of their mutual sedimentay basin during Permian- Triassic times. Nevetheless, some marked differences may be observed during the latest Permianbetween the Alborz and the other two regions, i.e. the Dorashamian Stage is missing in the Alborz, whereas both in Jolfa and
   Shahreza-Abadeh areas are well-represented.
   This gap, between the Permian – Triassic boundary beds, is marked by the development of a few metres of lateritic-bauxitic layers in the Alborz.
  
   Deformations analysis of Sabz – Pushan Fault zone
   Abstract
   Sabz-Pushan Fault Zone is chosen as a case study for deformation analysis of Zagros tear faults. This study has been shown that Sabz-Pushan Fault zone is divided into independent fault segments which present evidences of dextral shear deformation. These deformations, which have been studied in detail in this paper, include structural disturbances, changes in sedimentary basin conditions (facies changes) and Neotectonics deformations. Conclusion of this research can be extended to other Zagros tear faults, such as Kazerun, Karebas and Sarvestan fault, and then can be a suitable for better understanding of Zagros Fold-Thrust belt deformations.
  
   The optimization of effective parameters in beneficiation of Sarcheshmeh copper mine
   Abstract
   The Sarcheshmeh copper mine with an estimeated reserves of 1200 million tons of Cu and Mo grades of 1.1 and 0.03 percents respectively and other valuable elements such as gold, silver, etc., remains supreme among all other mines in the world.
   The investigation carried out, clearly shows that due to variations in recovery, feed and concentrate assays from one side and unoptimized parameters in the flotation circuits from other sides, there is ameaningful reduction in overall recovery. Therefore, the investigation have been carried out to optimize the important parameters and final results shows that it would be possible to increase the recovery from 86% (with copper grade of 29% ) to 91.5% (with copper grade of 34.5%).
   The results obtained are not only encouraging but also form original and distinct contribution to the optimization of parameters in beneficiation of copper in genreal and that of Sarcheshmeh copper plants in particular, as discussed in an appropriate parts of the paper.

 
 
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