M Mohammadi; H Ahmadipour; A Moradian
Abstract
Ab-Bid ultramafic complex in the north of Hormozgan province is a part of Hadji-Abad-Esphandagheh ophiolitic belt. Harzburgite forms more than 90 volume percent of the complex and lherzolite, dunite, pyroxenite and chromitite are the other lithologies. The harzburgites occur as massive non-layered outcrops ...
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Ab-Bid ultramafic complex in the north of Hormozgan province is a part of Hadji-Abad-Esphandagheh ophiolitic belt. Harzburgite forms more than 90 volume percent of the complex and lherzolite, dunite, pyroxenite and chromitite are the other lithologies. The harzburgites occur as massive non-layered outcrops with oriented minerals. Textures such as orientation and elongation of crystals, recrystallization, clinopyroxene exsolution lamellae in orthopyroxenes and different generations of minerals in these rocks show that they have been formed in the upper mantle and then emplaced in the crust. Mineral chemistry data indicate that the Ab-Bid harzburgites formed in an environment similar to those considered for MORB peridotites and they have experienced about 15 % partial melting. Then, they affected by mantle metasomatism and were enriched in incompatible elements. Olivine-spinel thermometry in these harzburgites shows equilibrium temperatures of 1000-1200 ºC and suggests that they have been equilibrated in spinel peridotite field. Chemical evidence and tectonic setting of the studied harzburgites show that these rocks are similar to the abyssal peridotites and probably formed in a back arc basin environment. Ab-Bid harzburgites probably were part of mantle wedge over the Neotethys subducted slab in a back arc basin environment.
M Shiea; V Chegini
Abstract
In this research, the reactions of coastline between Lengeh and Gavbandi ports in the Hormozgan Province have been investigated using Hanson and Hayes classification methods. To achieve this, the dominant hydrodynamic forces along the coasts were first explored, then the effective variables were measured. ...
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In this research, the reactions of coastline between Lengeh and Gavbandi ports in the Hormozgan Province have been investigated using Hanson and Hayes classification methods. To achieve this, the dominant hydrodynamic forces along the coasts were first explored, then the effective variables were measured. According to Hayes method, the coasts situated around the Tahoneh and Gorzeh ports, between Gorzeh and Chirouyeh, between Charak and Gorzeh ports, and around Mogham are tide-dominated (low). The coastline is of mixed-energy type (tide-dominated) in Bostaneh, Chiruyeh port and around Moghdan. According to the Hanson method, however, the coastline is wave-tide dominated in all stations.
