Mojgan Salavati - Academia.edu (original) (raw)

Papers by Mojgan Salavati

Journal of the virtual explorer, 2008

Arabian Journal of Geosciences, Nov 9, 2012

One of the best-preserved Neo-Tethyan ophiolite complexes of Iran (Southern Caspian Sea ophiolite... more One of the best-preserved Neo-Tethyan ophiolite complexes of Iran (Southern Caspian Sea ophiolite complex) is exposed in north of Iran. Crustal ultramafic cumulative rocks are mainly composed of dunite, wehrlite, olivine clinopyroxenite and clinopyroxenite. Mafic plutonic rocks consist of isotropic and layered gabbros. Geochemical studies show that these rocks have subalkalic tholeiitic affinity. Partial melting has been an important process in the formation of the studied rocks. Normalized trace element patterns in the studied rocks show enrichment in LREE and depletion in Nb and Zr. Studied mafic-ultramafic samples are formed by 30 % partial melting of mantle lherzolite from a depleted-arc source. These characteristics show suprasubduction environment and formation in a marginal basin above a subduction zone.

fu iQ H-b¡ ^ Iranian Journal of Crystallography and Mineralogy, Vol.9, No.l, Spring 1380/2001 hJ ... more fu iQ H-b¡ ^ Iranian Journal of Crystallography and Mineralogy, Vol.9, No.l, Spring 1380/2001 hJ ■ о о Mineral chemistry of mica and clinopyroxene in lamprophyre dykes in the south ofAmlash Salavaty, M., Darvishzadeh, В., Darvishzadeh, A Department of Geology, Faculty of ...

The Southern Caspian Sea ophiolite complex (SCO) is one of the Late Cretaceous discontinuous ocea... more The Southern Caspian Sea ophiolite complex (SCO) is one of the Late Cretaceous discontinuous oceanic lithosphere remnants in northern Iran. These complex is almost a complete sequence from bottom to top, ultramafic cumulates, layered gabbros, isotropic gabbros, dike complex and basaltic lavas which is covered by Late Cretaceous (Companionmaaestirchtian) pelagic limestone. Crustal ultramafic cumulative rocks are mainly composed of dunite, wehrlite, olivine clinopyroxenite and clinopyroxenite. The crystallization order in the ultramafic rocks is: olivine (with high Mg# in clinopyroxene) + clinopyroxene (cumulus and with high Mg#) + olivine (intercumulus and with low Mg#). The mineral chemistry of the ultramafic cumulates of the Southern Caspian Sea ophiolite (SCO) is not consistent with crystal-liquid fractionation of primitive mid oceanic ridge basalts at low pressures. The presence of highly magnesian clinopyroxene (Mg# = 81-90), homogenouse composition of clinopyroxene, absence of zoning in clinopyroxene together with the absence of plagioclase, as early fractionating phases, indicate medium-to high-pressure (up to 10 kbar) crystal fractionation of primary basaltic melts. Mineralogical and geochemical data suggest that the ultramafic cumulates are distinct from rocks in mid oceanic ridge ophiolites. Mineral composition of clinopyroxene show that the ultramafic rocks of Southern Caspian Sea ophiolite, were formed from the basaltic magma in an island arc/suprasubduction zone tectonic setting.

Journal of Geological Research, Oct 4, 2012

Bakhtiari dam is located on the Bakhtiari river, 120 km away from the north of the Andimeshk city... more Bakhtiari dam is located on the Bakhtiari river, 120 km away from the north of the Andimeshk city. Upper diversion tunnel of this dam with large cross section (13.7 m excavation diameter) and more than 1 km length is a huge construction. The tunnel is placed in the Sarvak formation carbonate rocks of Bangestan group which passes through seven different geological zones with various specifications (SV1, SV2, SV3, SV4, SV5, SV6, and SV7). Joint studies show two main discontinuit including bedding and a main group of joint (J1) together with random joints (faults and fractures). Most of discontinuities have been filled mainly by calcite or calcite and clay. Data deduced from testing and analysis shows good-to-excellent RQD classes with 75 to 90 values. Based on RMR and Q methods, generally rock masses have good to very good quality with 61 to 95 values for RMR and 10 to 35 values for Q. Based on conducted stability analysis, suitable supports were suggested for tunnel by RMR and Q methods. As a result, it can be concluded that all units have a good stability. Therefore, systematic rock bolting with 40-50 mm unreinforced shotcrete has been proposed for some special place. For rock support, according to RMR method, 3 m rock bolts in crown, 2.5 m spacing and with 50 mm shotcrete in crown has been proposed also 3 m rock bolts, based on Q method, 2.3-2.4 m spacing with systematic Bolting without shotcrete or 40 mm unreinforced shotcrete in some units, has been proposed. According to RMR method, for SV5 zone with very good and excellent quality, local 33 bolting without shotcrete and 3m rock bolts, 3 m spacing and spot bolting according to Q method has been proposed.

Toxin Reviews, Aug 14, 2023

Igneous rocks, a part of a dismembered ophiolitic complex, cropping out in the south of Amlash, a... more Igneous rocks, a part of a dismembered ophiolitic complex, cropping out in the south of Amlash, are mostly composed of basaltic lavas, doleritic dikes, gabbroic and pyroxenitic intrusions. Clinopyroxenes in these rocks are generally augite and diopside, which ...

Journal of Applied Sciences, 2011

Journal of Pharmaceutical Negative Results, Oct 10, 2022

The Alborz-Azerbaijan magmatic zone in northern Iran is one of the important zones of magmatic ac... more The Alborz-Azerbaijan magmatic zone in northern Iran is one of the important zones of magmatic activity in the Cenozoic. Lithologically, this complex consists of olivine gabbro, monzogabbro, dolerite, and gabbro with granular, intergranular, and porphyritic textures. The main phenocrysts of these rocks are clinopyroxene, plagioclase, and sometimes iddingsitized olivine. The rocks producing magma has potassic and shoshonitic nature. Enrichment in large-ion lithophile elements (LILEs), i.e., Ba, Rb, and Th, and depletion of high-field strength elements (HFSEs), i.e., Ti and Nb, in the spider diagrams are of the characteristics of subduction and active continental margin rocks. Also, these diagrams show enrichment in the light rare earth elements (LREEs) compared to heavy rare earth elements (HREEs). This feature also is representative of the rocks of subduction zones and active continental margins. The geochemical and petrogenetic studies indicate unique origin of the intrusive rocks in the study area and the role of fractional crystallization with simultaneous crustal assimilation (AFC) and magma contamination with crustal rocks in the evolution of the magma forming these rocks. This magma is obtained from the low-degree partial melting of an enriched mantle source beneath the continental lithosphere with garnet lherzolite composition at a depth of 100 to 110 km in a post-collision extensional basin.

Arabian Journal of Geosciences

Nexo Revista Científica, 2020

The gabbroic rocks in the Gysel area of the Central Alborz Mountains in north Iran are intruded i... more The gabbroic rocks in the Gysel area of the Central Alborz Mountains in north Iran are intruded into the Eocene Volcano-sedimentary units. The main gabbroic rocks varieties include gabbro porphyry, olivine gabbro, olivine dolerite and olivine monzo-gabbro. The main minerals phases in the rocks are plagioclase and pyroxene and the chief textures are sub-hedral granular, trachytoidic, porphyritic, intergranular and poikilitic. Electron microprobe analyses on minerals in the rock samples shows that plagioclase composition ranges from labradorite to bytonite, with oscillatory and normal chemical zonings. Clinopyroxene is augite and orthopyroxene is hypersthene to ferro-hypersthene. Thermometry calculations indicate temperatures of 650˚C to 750˚C for plagioclase crystallization and 950˚C to 1130˚C for pyroxene crystallization. Clinopyroxene chemistry reveals sub-alkaline and calc-alkaline nature for the parental magma emplaced in a volcanic arc setting.

Petrology, 2016

In the northern ranges of Guilan in Degarmankesh, alkali gabbroic bodies have been outcropped. Ba... more In the northern ranges of Guilan in Degarmankesh, alkali gabbroic bodies have been outcropped. Based on petrographic studies, the essential minerals are plagioclase, pyroxene and± Olivine. Chlorite, termolite-actinolite, serpentine, sosorite are secondary and opaque is accessory mineral of the rocks studied. Based on geochemistry data, the rocks studied are plotted on gabbro domain. Normalized trace element patterns relative to MORB and primitive mantle show LREE enriched and HREE depleted. K, Th, Rb positive anomaly as well as negative anomaly of Ta, Nb and Ti point to continental crust contaminated by the rocks under discussion. In terms of tectonic setting, the studied rocks lie in continental intraplate and continental arc environment. The parent magma generated by 5% to 14% partial melting of garnet lehrzolite mantle source possibly at the depth of approximately 80 km. The overall petrographic and geochemical criteria indicate that the studied gabrros originated from magmatism ...

Journal of Economic Geology, 2014

DOAJ (DOAJ: Directory of Open Access Journals), Nov 1, 2021