Three granitoid bodies, Shirkuh batholith, Kaffe-Abad and Ader-Bolandan are exposed in NW Yazd, Cutting across the Naiband formation. (Upper Triassic), and overlain by Cretaceous formations. Shirkuh batholith is most likely of Jurassic age. It seems to be the first and the most significant episode of magmatism in studied area which occurred in Middle Jurassic (Late Cimmerian) time. On the other hand, contact metamorphism of Cretaceous limestone arround the Kaffe-Abad and Ader-Bolandan intrusive bodies due to intrusion of granites and dioritic dikes and also the formation of various skarns indicate that the Kaffe-Abad and Ader -Bolandan intrusive bodies were emplaced during the later orogenic phases. Therefore, Shirkuh granitoid batholith has a wide range of Plutonic activity during Jurassic time, the most important episode of which has occurred in Middle Jurassic. Because of metamorphism of surrounding Cretaceous limestons, the Kaffe-Abad and Ader-Bolandan intrusive bodies are at least younger than Lower Cretaceous and it is also possible that they are Oligo- Miocene in age. Quartz, plagioclase and orthoclase are the major minerals, while garnet, biotite, pyroxene, amphibole, tourmaline, apatite, zircon, cordierite, andalusite, magnetite and hematite are found as accessory minerals in these rocks. SiO, NaO, KOand CaO content are variable in different parts of the intrusive bodies. Spider diagrams clearly demonstrate Ba, K, Rb enrichment and Ti, Sr, Nb depletion in these rocks.Geochemically, two types of granites, I and S, are recognized, S-type granites of which are more abundant in the region. Marble, skarn, Fe-Cu-Pb-Zn. mineralization and non-metalic-minerals, such as kaolinite exist as economic potentials.

Bolboluyieh bauxite-laterite deposit of south-east Kerman is presented at the base of the Naiband Formation (upper Triassic) and was directly formed on a Karstic surface of dolomitic parts of the Shotori Formation. This deposit has a reserve of 15 million tonnes. Diaspore, boehmite, chlorite, hematite, goethite, kaolinite, anatase and rutile are the major minerals in this deposit. The common texture of this unit is oolitic to pisolitic. The presence of some volcanic rock fragments with pilotaxitic texture as well as bipyramid pseudomorphic shape of olivine and clinopyroxene grains reveal that the protolith of bauxites was probably a volvanic rock of basaltic type.Geochemical studies indicate that Bolboluyieh bauxite is composed of 40.37% Al2O3, 24.64% Fe2O3 and 13.92% SiO2. Based on the geochemical characteristics, Bolboluyieh bauxite is formed under condition of high silica leaching and concomitant enrichment of aluminium and iron which corresponds with pH between 4 to 8.5 and Eh of +0.4 to + 1.

The Shotori mountain range at northern end of the Nayband active fault is one of the east central Iranian ranges in east of Tabas city and playa. Old alluvial cyclic stream terraces and buried Quaternary fault scarps in western mountain front area, and three kind of old, braided, and active alluvial fans in Tabas plain are witnesses to mountain neotectonic uplift, westward migration of Quaternary sedimentation, and eastward movement of retrograde erosion along seasonal rivers. Ancient perched caves and qanats in alluvial valley slopes present the speed of deep erosion.Outcropped Neogene anticlines, old erosional terraces, meandring antecedent river gorges, and warping of the old fans in Tabas plain all point to periodic active uplift of the plain with respect to the playa. Geomorphic indices, such as knickpoints in longitudinal river profile, valley width/heigth ratio, and mountain front sinuosity show that the active tectonic movements are due to the Quaternary faults in the Tabas plain and along northern and southern parts of the moimtain front, but the middle front seems to be inactive in the present time.Meanwhile, the 1978 earthquake of Tabas (Ms=7.3) after an 11-century seismic gap is a proof to the active westward migration of the deformational front. In this way, the close relationships between the tectonic geomorphology of the area and the seismotectonics of the recent earthquake led us to introducing relic, inactive, active, and new-born mountain fronts in the area; and the role of such studies in better undrestanding of activity and seismicity history of regions is emphasized.

The Sorkh Shale Formation (Lower Triassic) crops out in parts of Tabas Block. This formation is composed of limestone, dolomite, sandstone, shale and gypsum. Its lower contact with the Permian rocks and its upper contact with the Shotori Formation are marked by distinct erosional unconformity. To determine the depositional environments of the Sorkh Shale Formation, stratigraphic sections of Godar-e-Sorkh (southeast of Tabas), Godar-e-Gachal (southwest of Tabas) and Islam-Abad (southeast of Zarand) have been studied.Field and laboratory studies have shown that the Sorkh Shale Formatin consists of carbonate (lagoonal to tidal flat environments), silisiclastic (lagoonal, tidal flat and coastal plain environments) and evaporite (playa environment) facies. Both carbonate and siliciclastic storm deposites (tempestite) are also recognized. The Sorkh Shale Formation have been formed in a homoclinal clastic-carbonate ramp similar to the peresent day Persian Gulf. The Sorkh Shale succession in the Tabas Block indicates a depositional sequence (3rd_order cycle) bounded by type 1 unconformities. Northward increase in carbonate content, northward paleocurrent directions and higher thickness of the Lower Triassic rocks indicate that the Sorkh Shale Formation was deposited in a failed rift along the Kalmard/Kuhbanan and Nayband Faults.

This experiment was conducted to introduce the main families and identify the species of Pleuronectiformes on coastline of the Persian Gulf along Hormozgan province, from Gavbandi in southwest to Hormoz Strait. The study was carried out from March 2003 to June 2004.In this study, 329 fish were sampled. The fish were either caught by trawl or bought from the local fishmongers. The sampling was carried out in 9 different regions seasonally. Some 36 traits and parameters including 18 morphometric (measurable), 11 meristics (countable) and 7 apparent ones were determined. Analysis of morphometric data and dendrograms using cluster method and comparing the biometric data with the identification check list, it turned out that there were 6 main and dominant families including Citharidae, Bothidae, Soleidae, Psttodidae, Cynoglossidae, Paralichtidae in the area. In addition, the identification of above-mentioned families indicated that 15 species of such families are inhabiting the Hormozgan coastline of the Persian Gulf. The identified species are as follows:Brachirus orientalis, Parachirus marmoratus; (family Soleidae); Cynoglossus arel, Cynoglossus bilineatus, Cynoglossus puncticeps, Cynoglossus lachneri (Family Cynoglossidae); Pseudorombus elevatus, Pseudorombus arsius, Pseudorombus malayanus, Poecilopstei  javanicus (Family  paralichtidae); Arnoglossus aspilos, Arnoglossus arabicus, Laeopes guentheri (Family Bothidae); Psettodes erumei (Family Psettodidae) and Citharoides macrolepis (Family Citharidae).

In order to stock assessment of 3 main species of Nemipterus japonicus, Carangoides malabaricus and Ulua mentalis, a research cruise was carried out in the Persian Gulf (Hormuzgan province waters) by swept area method in 2001. The studied area was restricted to Ras-Naiband in west (52 45E) up to Ras-Sirik in east (57 00E), with covering 3 substrata of 10-20m, 20-30m and 30-50m depths. Samplings were carried out by using F/V Ferdows-2 equipped with a bottom trawl. After hauling the samples were identified, weighted and also some biological measurements were done. All data were analyzed by Excel software, and the biomass of each species was estimated seperately and the distribution pattern of them was prepared by Arcview software. The total biomass of N. japonicus was calculated about 1140 tons and the minimum was 433 tons in 433 tons in Bandar-Abbas and Sirik area and 422 tons in Bandar-Charak area, and with minimum biomass in Bandar-Lengeh with 53 tons. On the other hand the most biomass of this species was found in depths of 30-50m.The total biomass of C. malabaricus and U.mentalis were estimated about 1697 and 652 tons, respectively in Bandar-Charak area and with the most abundance in depths of 30-50m.

This experiment was conducted to introduce the main families and identify the species of pleuronectiformes on coastline of Persian Gulf area Bushehr province, from Deylam in North west to Naeband Gulf in South east. The study was carried out from March 2003 to June 2004. In this experiment, 311 fish were employed. The fish were either cought by trawl or bought from the local fishmongers. The sampling was carried out in 11 different regions seasonally. Some 36 trait and parameters including 18 morphometric (measurable) ones, 11 meristic ones (counable) and 7 apearance ones were measured and determined. Assasing data analysis some morphometric parameters, preparing dendrograms using cluster method and comparing the data biometry with the check list identificant index species, it turned out that there are 5 main and dominant families including: Psettodidae, Soleidae, Cynoglossidae, Bothidae, Paralichtidae in the area. In addition, the identification of above-mentioned families indicated that 17 species of such families inhabit on Bushehr coastline of the Persian Gulf.The identified species are as follows:Brachirus orientalis, Solea elongata, Zebrias synapturides, Parachirus marmoratus; (family Soleidae) Cynoglos susarel, Cynoglossus bilineatus, Cynoglossus Puncticeps, Cynoglossus capenis, Cynoglossus kopsii; (Family Cynoglossidae); Pseudorombus elevatus, Pseudorombus arsius, Pseudorombus malayanus, Poecilopstei javanicus (Family paralichtidae); Arnoglossus aspilos, Engyprosopon grandisquama, Laeopes guentheri, (Family Bothidae) and Psettodes erumei (Family Psettodidae).

The biomass of batoidfishes biomasses (rays and skates) was estimated during November and December 2005 in Hormuzgan provincial waters (between Ras Meidani in the Oman Sea and Ras Naiband in the Persian Gulf). The total biomass was 12454 tons. Furthermore, the estimated biomass for depth layers 10-20, 20-30 and 30-50 meter were 7567, 1966231 and 292 tons, respectively.In addition, the biomass, CPUA and CPUE rates were also evaluated for each species in different depth layers. Himantura gerrardi with 6065 tons in depth layer 10-20 meter and Torpedo sp. with 0.6 ton in depth layer 20-30 meter had maximum and minimum biomass, respectively, among all the specimens. The number per area, mean weight and catch per unit area of batoidfishes in different depth layers were statistically analysed at 95 percent confidence.The number and catch per unit area of Himantura gerrardi significantly differed (P<0.05) between depth layers 30-50 meter and deeper than 50 meter, but not for other species (P>0.05).