F. Shirezade Esfahani; A. Bayet-Goll; N. Kohansal Ghadimvand; A. Kangazian; A. Akbari Mohammadi; M. Sadri
Abstract
The carbonate successions (Tournaisian-Visean) exposed in the Tang-e-Darchaleh and Banarizeh sections from Sanandaj-Sirjan Zone (SSZ), Iran, have been used to generate a facies model. From the analysis of facies and their associations, four depositional zones are recognized on the Tournaisian-Visean ...
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The carbonate successions (Tournaisian-Visean) exposed in the Tang-e-Darchaleh and Banarizeh sections from Sanandaj-Sirjan Zone (SSZ), Iran, have been used to generate a facies model. From the analysis of facies and their associations, four depositional zones are recognized on the Tournaisian-Visean ramp: basinal environments, outer ramp (FA1 and FA2; deep subtidal associations), mid ramp (FA3, FA4 and FA6; shallow subtidal to lower intetidal associations), and inner ramp (FA5; shoal). The gradual transitions between facies and facies associations, as well as the depositional profile of the shelf transect indicate a low gradient ramp. The observed sedimentary features in the facies associations portray a transgressive, proximal-to-distal, wave-dominated combined flow marine ramp sequence, as recorded in stratigraphic changes in character of storm bed sequences and the spatial arrangement of types of storm bed along the depth related environmental gradients. This study suggests that during the Lower Carboniferous, a broad shelfal platform covered the southern margin of the Palaeotethys, which was characterized by dominantly shallow carbonate ramp.
M Maanijou; N Puyandeh; A.A Sepahi; S Dadfar
Abstract
The study area is located at 42 km NE of Qorveh city, in KordestanProvince and in the Metamorphic– Magmatic Sanandaj-Sirjan Zone. There are other important gold mines such as the Zarshouran and Aghdarreh mines in this zone. The most important alterations of the region are sericitic (phyllic), argillic, ...
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The study area is located at 42 km NE of Qorveh city, in KordestanProvince and in the Metamorphic– Magmatic Sanandaj-Sirjan Zone. There are other important gold mines such as the Zarshouran and Aghdarreh mines in this zone. The most important alterations of the region are sericitic (phyllic), argillic, silicification and propylitic respectively. Therefore, in this research, the phyllic and argillic alterations were the main purpose and by using different techniques of images processing of satellite images such as: False Color Composition, Band Ratio, Principal Component analysis, Crosta and finally by Spectral Angle Mapper methods iron oxides and development of alterations have been recognized. For accuracy between field evidences and results of software processing, X-Ray Diffraction analysis were used for controlling and recognizing the index minerals of each zone. Then, the comparison between standard and the study area curves were done to confirm the obtaining results. Finally, this method was effective in recognizing and mapping of the hydrothermal alterations.
M. Sabeti; M. H. Emami; A. Saeedi; K. Ajdary; A. Minaee; A. R. Nadimi
Abstract
Bouin– Miandasht Intrusive body is located in South- West of Golpayegan quadrangle and Sanandaj- Sirjan Zone. This Intrusion is composed of a compositional range including: porphyroid granite (monzogranite- syenogranite), granodiorite and gabbro – diorite. Variation diagrams of major and ...
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Bouin– Miandasht Intrusive body is located in South- West of Golpayegan quadrangle and Sanandaj- Sirjan Zone. This Intrusion is composed of a compositional range including: porphyroid granite (monzogranite- syenogranite), granodiorite and gabbro – diorite. Variation diagrams of major and trace elements show a trend of continuous compositive spectrum and affinity in granite to granodiorite and noncontinuous spectrum and lack of affinity between gobbro- diorite with the former group. All samples are metaluminous and slightly peraluminous, and rich in K contents. On the basis of geochemical data, these rocks are I- type granites characterized by depletion in Ta, Nb, P, Ti and enrichment in Cs, K, Sr, Rb, Ba that are obvious in the multi-element spider diagrams. The enrichment in LILEs and depletion in HFSEs reveal I- type metalominous volcanic arc granitoid (VAG).Satellite images and geological evidences show that there are 2 main fault systems in Golpayegan region with two trends of NW-SE and NE- SW.
K. Orang; Mohammad Mohajjel; F. Mousivand; E. Rastad
Abstract
The Chah Gaz Zn-Pb-Cu volcanogenic massive sulfide (VMS) deposit is a polydeformed, polymetamorphosed ore body in southern part of the Sanandaj-Sirjan zone. The ore bodies are comprised predominantly of stratiform, tabular and lenticular massive sulfide lenses and are elongated in 0600-0700 orientation. ...
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The Chah Gaz Zn-Pb-Cu volcanogenic massive sulfide (VMS) deposit is a polydeformed, polymetamorphosed ore body in southern part of the Sanandaj-Sirjan zone. The ore bodies are comprised predominantly of stratiform, tabular and lenticular massive sulfide lenses and are elongated in 0600-0700 orientation. The host rocks and massive sulfides have been complexly deformed during three deformation stages (D1, D2, D3) and two associated episodes of green schist facies metamorphism (M1, M2) that all events occurred after middle Jurassic. The earliest structural elements in the mine area are bedding and continuous foliation (S1) that are preserved in the host rocks; include phyllites, slates and schists. F1 folds have not been identified in the ore bodies, Although they do recognized as shallowly to moderately plunging to NW and isoclinal folds within the Chah Gaz area. Geometry of ore bodies was mainly controlled by D2 structures (include folds and foliations). F2 plunge shallowly to NE or SW. F2 are close to open and their axial planes dip steeply to S and N. Ore bodies are commonly transposed from S0-S1 and show rearrangement parallel to axial planar foliation (AS2) and composite foliation (ST2). ST2 is vertical and strikes NE-SW. Sulfide minerals in the ore bodies have undergone extensive deformation, remobilization and dynamic recrystallisation during D2 tectono-thermal stage. D3 structures are locally controller of ore bodies and include folds and shear zones.
