JOURNAL OF GEOTECHNICAL GEOLOGY (APPLIED GEOLOGY)
Year:2009 | Volume:5 | Issue:2|Papers Count:8

The Mn, Fe, Ni, Co, Cu, Pb, Ga, Ge, Cd, Sn and Ag contents of 10 sphalerite samples from the Emarat Zn-Pb deposit were determined. The principal trace elements are Fe, Cd, Pb, and Mn. The Fe content of the sphalerite ranges from 11580 to 21700 ppm, the Cd content from 452 to 549 ppm, the Pb content from 652 to 5186 ppm, and the Mn content from <2 to 497 ppm. The Ni, Co, Cu, Ga, Ge, Sn, and Ag contents are low. Trace element geochemistry of sphalerite from the Emarat deposit compares well to literature data reported for classical Mississippi Valley-type (MVT) districts in the world. The Ga/Ge geothermometer indicates a temperature range of 175°C to 235°C for the ore-bearing fluid. This temperature range is consistent again with the ore formation temperatures for MVT deposits. Accordingly, the Emarat Zn-Pb deposit must be classified as an MVT deposit.

The study of planktonic Foraminifera of the Gurpi Formation in Mook area (south of Shiraz) confirmed the presence of standard biozones defined in Tethyan realm. Seven biozones were identified as follows: Biozones I (Dicarinella asymetrica) and II (Rosita fornicata) indicate an age of Early to Late Santonian. The presence of Biozones III (Globotruncanita elevata), IV (Globotruncana ventricosa) and V (Globotruncanita calcarata) represent the Early, Middle and Late Campanian. Biozones VI (Globotruncana falsostuarti) and VII (Gansserina gansseri) suggest an age of Early and Middle to Middle Late Maastrichtian. The absence of Abathomphalus mayaroensis biozone is due to a sedimentary gap that occurred in the uppermost Maastrichtian. The gap can be identified by a glauconitic layer above the last biozone. This paraconformity is not recognizable in the field.The presence of the layer that contains glauconite in the lower parts of the Gurpi Formation and the red limestones in the upper parts of the Sarvak Formation are the evidences of disconformity between the Gurpi and its underlying Sarvak Formation. The thickness of the Gurpi Formation in Mook area is 287.6 m. The lithology of this sequence consists of shale, marly limestone and argillaceous limestone. Its contact with the underlying Sarvak Formation is disconformable while it is paraconformable with the overlying Pabdeh Formation. In this section, the Gurpi Formation is of Early Santonian to Middle Late Maastrichtian age.

Fahliyan Formation (Volgian - Neocomian) (Early Cretaceous) is a part of Khami Group. This formation has been studied in two sections in center of Fars (southwest of Arsenjan city and west of Sivand city) to determine its facies, sedimentary environments and sequence Stratigraphy. The deposits of Fahlyian Formation consist of carbonate facies which are deposited in a Carbonate Rimmed Shelf. Two sequences with both type 1 and type 2 sequence boundaries are recognized within these deposits which are in accordance with a part of Zuni mega sequence (Lower Zuni III). The age of this formation is referred toTithonian- Vallanginian (Early Cretaceous).

In the present work 35 cutting samples from 5 oilwells of Masjede-Soleiman oilfield have been pyrolysed by Rock-Eval6. Results indicate that, Kazhdumi, Garu and Sargelo formations have high TOC and Tmax values, passed diagenesis stage and therefore, have high hydrocarbon generation potential. Van Krevelen diagram demonstrating the studied formations shows type III kerogen for Sargelo formation and mixed type III/II kerogen for rest of the formations. Sargelo formation with Tmax up to 481°C not only crossed the oil window but also has reached wet gas generating stage. Total Organic Carbon and Tmax increase from northwest to southeast and also prove the increase in hydrocarbon genetic potential of Masjede-Soleiman oilfield.

In this research it was tried to use field work, geomorphometric indices such as mountain front faceting (Facet %), mountain front sinuosity (Smf), ratio of valley floor width to valley height (Vf), the study of air photos and processing of satellite images and detecting and enhancing of lineaments, using different remote sensing methods, to answer ambiguities regarding Babakouhi anticline and factors affecting the morphotectonic situation of the area. The research done shows that the pressure caused by Sabzpooshan Strike slip - dextral fault with NW-SE trend and Bamu Strike slip - dextral fault with SW-NE trend have had great impact on the deformation of the area such as changes in anticline trend, creation of main faults of the area and the creation of the university hill anticline.

The Izeh watershed plain with considerable limestone units is located in Zagros folded territory. The Asmari lime stone is the most significant water bearing formation in Izeh area and various springs are occurring in this karstic formation. In this investigation the effective factors governing development of the springs such as stratigaphy, structure and  topography had been assessed and in this  regard geology and structural evaluation including: folds, faults and fractures with use of remote sensing and GIS abilities had been carried out. The achieved results indicate that a promising correlation exists between springs location and the distance from fractures, and similarly a promising correlation is noticed between spring occurrence and fractures frequency. Water temperature and its seasonal fluctuation reflecting diffuse- fracture and diffuse flow systems. The assembled data is also depicting relation between density of fractures and saturation index. Seasonal variation of their temperature was emphasizing on diffuse and diffuse-fracture flow.

To provide guides for exploration of porphyry copper mineralization at a district scale, we examine the spatial association between known copper deposits and strike-slip faults/fractures in south central Iranian volcanic belt. The spatial associations between the porphyry copper deposits and strike-slip faults/fractures are quantified using weights of evidence modeling. The porphyry copper occurrences are associated spatially with strike slip faults/fractures within distances of 1 km. In addition, based on these observations local strike slip faults/fractures related to regional strike slip faults systems are the most important foci for emplacement of copper-bearing porphyritic intrusions in the study area.

Calculated factors such as level, shape, slope, drainage network and calculated and delineate curves hypsometric and curves undimension hypsometric constructed after analysis erosion and sedimentation in Watershed Ladiz have been done. Physiographical properties subwatershed in Geographical Information System (GIS) environment is obtained indicating equilibrium between the mountains and plains of the Saadabad subwatershed. Mianrud and Siahjangal subwatershed and young areas and their heights is highly exposed to erosion. Comparison of the extent, shape, slope and curves hypsometric subwatershed indicate the extent and severity of erosion under the mianrud area than other areas under more. General watershed areas Ladiz young and active can be considered as more than 3/2 level of the mountains is at risk of erosion and shall not establish the equilibrium.