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Articles 1 - 20 of 20
Full-Text Articles in Physical Sciences and Mathematics
The Gulf: An Appeal For More Coordinated Action On Climate Change, Fareed Yasseen
The Gulf: An Appeal For More Coordinated Action On Climate Change, Fareed Yasseen
New England Journal of Public Policy
This article seeks to provide the rationale behind Iraqi Prime Minister Al-Sudani’s call at the United Nations for the formation of a negotiating group within the United Nations Framework Convention on Climate Change process that brings together all member states of the Gulf Cooperation Council, Iraq, and Iran. This article argues that these countries would benefit doubly from such an arrangement, because it would help them better address the direct effects of climate change, on the one hand, and to better address the effects of the measures taken to address climate change, which will affect them as fossil fuel producers, …
Middle-Late Devonian Boundary Conodonts From Anarak And Sar-Ashk Sections, Centraliran, Hossein Gholamalian, Vachik Hairapetian, Mohammad Poosti
Middle-Late Devonian Boundary Conodonts From Anarak And Sar-Ashk Sections, Centraliran, Hossein Gholamalian, Vachik Hairapetian, Mohammad Poosti
Turkish Journal of Earth Sciences
The Middle/Late Devonian boundary is investigated based on twenty-four conodont species and subspecies from the Anarak and Sar-Ashk sections in the northwest and southeast of Central East Iran Microplate. The earliest Frasnian strata are defined by the first appearance of Ancyrodella rotundiloba pristina and can be correlated with the global stratotype in the Montagne Noir, South of France. The Late Givetian - Early Frasnian carbonates of the Bahram Formation in the Sar-Ashk section transgressively overlie the sandstones of the Padeha Formation, whereas the coeval interval in the Anarak section composes the middle part of the Bahram Formation. Conodont biostratigraphy of …
Petrology, Geothermobarometry, And P-T Path Of Spinel-Bearing Symplectite Migmatitesfrom The Simin Area, Hamedan, Sanandaj-Sirjan Zone, Iran, Ali Akbar Baharifar, Donna L. Whitney, Kwan-Nang Pang, Sun-Lin Chung, Yoshiyuki Iizuka
Petrology, Geothermobarometry, And P-T Path Of Spinel-Bearing Symplectite Migmatitesfrom The Simin Area, Hamedan, Sanandaj-Sirjan Zone, Iran, Ali Akbar Baharifar, Donna L. Whitney, Kwan-Nang Pang, Sun-Lin Chung, Yoshiyuki Iizuka
Turkish Journal of Earth Sciences
Migmatitic rocks in the Hamedan area, Sanandaj-Sirjan Zone, Iran, contain symplectite that has partially replaced andalusite. In metatexite, symplectite typically consists of spinel + cordierite + Ca-rich plagioclase ± orthoamphibole, but in diatexite, symplectite consists of spinel + Ca-rich plagioclase; cordierite is typically absent from symplectite although it is present in the matrix of the rock. A calculated P-T pseudosection for an average, nonmigmatitic bulk-rock composition indicates that the whole-rock composition was not the effective bulk composition during the formation of symplectite. Therefore, effective bulk compositions (EBCs) were calculated using modal abundance and the average composition of minerals in contact …
Mineralogy, Alteration, And Sulfur Isotope Geochemistry Of The Zehabad Intermediatesulfidationepithermal Deposit, Nw Iran, Somaye Shahbazi, Majid Ghaderi, Pura Alfonso
Mineralogy, Alteration, And Sulfur Isotope Geochemistry Of The Zehabad Intermediatesulfidationepithermal Deposit, Nw Iran, Somaye Shahbazi, Majid Ghaderi, Pura Alfonso
Turkish Journal of Earth Sciences
The Zehabad Pb-Zn-Au-Ag (Cu) deposit lies in the Alborz magmatic arc of northwestern Iran. Ore-bearing breccia veins hosted by Eocene tuffs emplaced along the 80?130° trending fault and fracture zone. Mineralization occurs in the contact of the late Eocene igneous bodies and the Eocene volcanic and volcanosedimentary Karaj Formation. Mineralization formed in five stages: 1) disseminated framboidal pyrite and minor chalcopyrite and sphalerite; 2) quartz veins containing chalcopyrite, bornite, pyrite, and sphalerite; 3) deposition of specularite and gold grains hosted in quartz veins that crosscut chalcopyrite; 4) the main stage of mineralization that contains galena, sphalerite, tennantite-tetrahedrite, pyrite, sulfosalts, and …
A Comparative Analysis Of Index Overlay And Topsis (Based On Ahp Weight) For Iron Skarn Mineral Prospectivity Mapping, A Case Study In Sarvian Area, Markazi Province, Iran, Faranak Fei̇zi̇, Edris Mansouri̇, Ali Reza Jafari̇ Rad, Mehran Ari̇an
A Comparative Analysis Of Index Overlay And Topsis (Based On Ahp Weight) For Iron Skarn Mineral Prospectivity Mapping, A Case Study In Sarvian Area, Markazi Province, Iran, Faranak Fei̇zi̇, Edris Mansouri̇, Ali Reza Jafari̇ Rad, Mehran Ari̇an
Bulletin of the Mineral Research and Exploration
The aim of this research is to compare index overlay and TOPSIS (based on AHP weight) for predictive Skarn potential map. In this paper, for Calcic Iron Skarn mineralization, criteria and subcriteria introduced and ranked for generating mineral prospectivity map. The values of final prospecting maps for Skarn deposit by index overlay and TOPSIS methods was specified by dividing the prospectivity values into 10 classes. For better comparison,values assign to classes base on their priority in mineral exploration. The comparative analyses of index overlay and TOPSIS integration methods, has been performed by selecting four GCPs for field checking. Field observation …
Feather-Like Hornblende Aggregates In The Phyllites From The Southern Sanandaj-Sirjan Zone, Iran; Their Origin And Mode Of Formation, Hossein Fatehi, Hamid Ahmadipour, Nakashima Kuzuo, Hesamaddin Moeinzadeh
Feather-Like Hornblende Aggregates In The Phyllites From The Southern Sanandaj-Sirjan Zone, Iran; Their Origin And Mode Of Formation, Hossein Fatehi, Hamid Ahmadipour, Nakashima Kuzuo, Hesamaddin Moeinzadeh
Turkish Journal of Earth Sciences
Several outcrops of spectacular feather-like hornblende aggregates occur in the phyllites of the Gol-e-Gohar complex (southeast of Iran) and form special Garbenschiefer rock types. The Gol-e-Gohar complex, as a part of the southern Sanandaj-Sirjan metamorphic zone, contains a succession of metabasites, phyllites, and slates intruded by dioritic intrusions. There are two types of hornblendes in the phyllites; the first one is concentrated around the fractures and the second one is randomly distributed in the rocks and forms radial feather-like hornblende aggregates. Petrographical and chemical characteristics of these two shapes of hornblendes are the same, except the latter is developed parallel …
The Morphology And Development Of Kalahroud Cave, Iran, Shirin Bahadorinia, Sayed Hassan Hejazi, Alireza Nadimi, Derek C. Ford, Karine Wainer
The Morphology And Development Of Kalahroud Cave, Iran, Shirin Bahadorinia, Sayed Hassan Hejazi, Alireza Nadimi, Derek C. Ford, Karine Wainer
International Journal of Speleology
Kalahroud Cave is located in central Iran, ~50 km north of Isfahan. The landscape is a typical mountain desert morphology of cuestas dissected by ravines and gorges created during rare surface run-off events; crest lines are ~2800 m asl and lowlands at ~2100 m asl. Kalahroud Cave (4500 m of mapped passages, ~60 m deep) is entered through breakdown in the eastern wall of a gorge. The host rock is a Cretaceous limestone and mudstone formation 60 m in thickness, underlain by sandstones and conglomerates and overlain by weakly permeable calcareous marl strata, all dipping 15-20o. Below the …
Delineation Of The Cr Mineralization Based On The Stream Sediment Data Utilizing Fractal Modeling And Factor Analysis In The Khoy 1:100,000 Sheet, Nw Iran, Somayeh Momeni̇, Seyed Vahid Shahrokhi̇, Peyman Afzal, Behnam Sadeghi̇, Taher Farhadi̇nejad, Mohammad Reza Ni̇kzad
Delineation Of The Cr Mineralization Based On The Stream Sediment Data Utilizing Fractal Modeling And Factor Analysis In The Khoy 1:100,000 Sheet, Nw Iran, Somayeh Momeni̇, Seyed Vahid Shahrokhi̇, Peyman Afzal, Behnam Sadeghi̇, Taher Farhadi̇nejad, Mohammad Reza Ni̇kzad
Bulletin of the Mineral Research and Exploration
Fractal methods are regarded as a highly efficient method for more accurate separation of boundaries between mineralized zone in shallow and deep studies. In this research, concentration-number (C-N) and concentration-area (C-A) fractal methods were used in order to identify promising areas of the elements like Cr, Co and Ni in the Khoy 1:100,000 geological mapping sheet, NW Iran. The factor analysis was performed on the elements, and factors, which were related to the elements, were isolated and studied by both fractal methods. The current geological locations of the extreme anomalies were investigated and the results showed a very close relationship …
Geochemistry, Zircon U-Pb Age, And Tectonic Constraints On The Bazman Granitoid Complex, Southeast Iran, Mohammad Reza Ghodsi, Mohammad Boomeri, Sasan Bagheri, Daizo Ishiyama, Fernando Corfu
Geochemistry, Zircon U-Pb Age, And Tectonic Constraints On The Bazman Granitoid Complex, Southeast Iran, Mohammad Reza Ghodsi, Mohammad Boomeri, Sasan Bagheri, Daizo Ishiyama, Fernando Corfu
Turkish Journal of Earth Sciences
The Bazman granitoid complex (BGC), including a large zoned pluton, intrudes into the upper Paleozoic sedimentary cover of the Lut block. It crops out on the southern slope of the Bazman volcano in Baluchestan Province of Iran. The intrusive rocks range from gabbro to various metaluminous to weakly peraluminous granites, and they are classified as I-type magmatic series. They display geochemical characteristics of typical volcanic arc magmatism at continental margins. Major- and trace-element variation diagrams show that fractional crystallization was the major process and crustal contamination, a subordinate process during the evolution of the BGC. The decrease in CaO, MgO, …
Nature And Physicochemical Conditions Of Crystallization In The South Dehgolan Intrusion, Nw Iran: Mineral-Chemical Evidence, Fatemeh Sarjoughian, Ali Kananian, David Richard Lentz, Jamshid Ahmadian
Nature And Physicochemical Conditions Of Crystallization In The South Dehgolan Intrusion, Nw Iran: Mineral-Chemical Evidence, Fatemeh Sarjoughian, Ali Kananian, David Richard Lentz, Jamshid Ahmadian
Turkish Journal of Earth Sciences
The South Dehgolan intrusion in the Sanandaj-Sirjan Zone ranges in composition from calc-alkalic monzogabbro to syenite to alkalic granite. This suite is composed mainly of variable proportions of quartz, K-feldspar, plagioclase, biotite, hornblende, and pyroxene. The plagioclase composition varies between albite to labradorite. The biotites are Mg- to Fe-rich in the monzogabbro to granite, respectively. The amphiboles are calcic and the composition varies from magnesiohornblende to actinolite. Clinopyroxene compositions fall in the diopside-augite field. The average calculated near-solidus crystallization temperatures are 774 °C, 655 °C, and 775 °C for the monzogabbro-monzodiorite, syenite, and granite, respectively. Calculated average pressures of emplacement …
Rare Earth Element Geochemistry Of The Upper Permian Limestone: The Kanigorgeh Mining District, Nw Iran, Ali Abedini, Ali Asghar Calagari
Rare Earth Element Geochemistry Of The Upper Permian Limestone: The Kanigorgeh Mining District, Nw Iran, Ali Abedini, Ali Asghar Calagari
Turkish Journal of Earth Sciences
The limestone of the Ruteh Formation of Upper Permian age in the Kanigorgeh district (northeast of Bukan, NW Iran) contains several layers and lenses of bauxitic ores. Mineralogical data show that this limestone consists of calcite and quartz as major and plagioclase, kaolinite, and hematite as minor mineral phases. Geochemical analyses reveal that the proportions of ?REEs (La-Lu) in this limestone vary from 35.28 to 160.78 ppm. The values of Eu and Ce anomalies (normalized to PAAS) of the limestone have ranges of 1.11-1.68 and 0.89-1.16, respectively. The high values of ?REEs; low values of Y/Ho; strong and positive correlations …
Geochemical Characteristics Of Laterites: The Ailibaltalu Deposit, Iran, Ali Abedini, Ali Asghar Calagari, Khadijeh Mikaeili
Geochemical Characteristics Of Laterites: The Ailibaltalu Deposit, Iran, Ali Abedini, Ali Asghar Calagari, Khadijeh Mikaeili
Bulletin of the Mineral Research and Exploration
Alibaltalu laterite deposit is located ~20 km northeast of Shahindezh, south of West-Azarbaidjan
province (NW of Iran). This deposit is developed as stratiform lenses along the boundary of
Elika dolomites (Triassic) and Shemshak sandstones (Jurassic). The distribution fashion of
minerals such as boehmite, diaspore, kaolinite, muscovite-illite, rutile, anatase, hematite and
goethite in this deposit was accompanied by the development of four types of ore facies: (1)
ferrite; (2) laterite; (3) bauxitic kaolinite; and (4) kaolinitic bauxite. Petrographically, the ores
show conglomeratic, rounded-granular, veinlet, colloform, pelitomorphic, pseudo-porphyritic,
nodular, and spongy textures. Comparison of distribution pattern of elements along a selective
profile …
Ree Geochemical Characteristics Of Titanium-Rich Bauxites: The Permian Kanigorgeh Horizon, Nw Iran, Ali Abedini, Ali Asghar Calagari
Ree Geochemical Characteristics Of Titanium-Rich Bauxites: The Permian Kanigorgeh Horizon, Nw Iran, Ali Abedini, Ali Asghar Calagari
Turkish Journal of Earth Sciences
The Permian Kanigorgeh bauxite horizon is one of the typical titanium-rich bauxite deposits in the northeast of Bukan, West Azerbaijan Province, NW Iran. It is a part of the Irano-Himalayan karst bauxite belt and was developed as discontinuous stratified layers and lenses in Upper Permian carbonates. Mineralogically, diaspore and kaolinite are 2 major mineral phases accompanied by boehmite, smectite, illite, rutile, anatase, hematite, goethite, chlorite, quartz, and plagioclase as minor phases. Geochemical considerations for a selected profile indicate that the concentration values of rare earth elements (REEs) in the bauxite ores range from 8.9 to 200.4 ppm. Eu and Ce …
Neotectonics Of The Zanjan-Kazvin Area, Central Iran: Left Lateral Strike‐Slip Induced Restraining Stepovers, Moosarreza Toori, Gürol Seyi̇toğlu
Neotectonics Of The Zanjan-Kazvin Area, Central Iran: Left Lateral Strike‐Slip Induced Restraining Stepovers, Moosarreza Toori, Gürol Seyi̇toğlu
Turkish Journal of Earth Sciences
The neotectonics of the Zanjan-Kazvin area are dominated by the region-wide E-W trending left lateral strike-slip faults. These faults create restraining and releasing stepovers indicating strain partitioning. Instead of the NW-SE trending long range-parallel continuous thrust faulting suggested in previous studies, this paper demonstrates that there are E-W trending range-crossing left lateral strike-slip faults creating short range-parallel thrust faults in the restraining stepovers. Establishing this strike-slip-induced structural style might contribute to an understanding of the nature of the Elburz (Alborz) Mountains located between the Central Iran and Caspian blocks.
Analysis Of Precursory Seismicity Patterns In Zagros (Iran) By Cn Algorithm, Majid Maybodian, Mehdi Zare, Hosseyn Hamzehloo, Antonella Peresan, Anooshiravan Ansari, Giuliano F. Panza
Analysis Of Precursory Seismicity Patterns In Zagros (Iran) By Cn Algorithm, Majid Maybodian, Mehdi Zare, Hosseyn Hamzehloo, Antonella Peresan, Anooshiravan Ansari, Giuliano F. Panza
Turkish Journal of Earth Sciences
This study illustrates the application of the CN algorithm for the analysis of precursory seismicity patterns in the Zagros region (Iran), an area characterized by a complex seismotectonic setting and by remarkable seismic activity. CN is a formally defined and widely tested algorithm for intermediate-term middle-range earthquake prediction, based on the analysis of routinely compiled earthquake catalogs. To allow its application, the global and regional catalogs available for the territory of Iran have been analyzed so as to compile a data set sufficiently complete and homogeneous over a time span of about 3 decades, as required for CN application. A …
Chemistry Of Magmatic And Alteration Minerals In The Chahfiruzeh Porphyry Copper Deposit, South Iran: Implications For The Evolution Of The Magmas And Physicochemical Conditions Of The Ore Fluids, Morteza Einali, Saeed Alirezaei, Federica Zaccarini
Chemistry Of Magmatic And Alteration Minerals In The Chahfiruzeh Porphyry Copper Deposit, South Iran: Implications For The Evolution Of The Magmas And Physicochemical Conditions Of The Ore Fluids, Morteza Einali, Saeed Alirezaei, Federica Zaccarini
Turkish Journal of Earth Sciences
The Chahfiruzeh deposit is a newly discovered porphyry-style copper deposit in the southern part of the Cenozoic Urumieh-Dokhtar magmatic arc of Iran. Mineralization is associated with a Miocene quartz-diorite to quartz-monzodiorite porphyritic intrusion (Chahfiruzeh porphyry) intruded into older basaltic and andesitic lava flows and pyroclastic rocks. Alteration assemblages and alteration zoning, typical of porphyry copper deposits, are well developed. Mineralization occurs in quartz-sulfide stockworks and as sulfide disseminations in the porphyritic intrusion and the immediate wall rocks. Pyrite and chalcopyrite are the main hypogene sulfide minerals; bornite and molybdenite are rare. Representative magmatic and alteration minerals, including plagioclase, amphibole, biotite, …
Tabasosphaera Pustulosa Nov. Gen., Nov. Sp., A Microproblematicum (Foraminifer?) From The Upper Triassic (Norian-Rhaetian) Reef Limestone Of Nayban Formation (Ne Iran), Baba Senowbari-Daryan
Tabasosphaera Pustulosa Nov. Gen., Nov. Sp., A Microproblematicum (Foraminifer?) From The Upper Triassic (Norian-Rhaetian) Reef Limestone Of Nayban Formation (Ne Iran), Baba Senowbari-Daryan
Studia UBB Geologia
A microproblematicum with calcaerous test, Tabasosphaera pustulosa nov. gen., nov. sp., a hollow spherical microfossil with pustule-like elements on the outer surface, is described from Upper Triassic (Norian-Rhaetian) reef limestones exposed near the town of Ali-Abad, south of Tabas (northeast Iran). Tabasosphaera is an endobiotic organism living within the cavities of other organisms, such as brachiopods, worm tubes, or in sponge spongocoels. The systematic position of Tabasosphaera, its interspecific association and the fossil assemblage of which it makes part is discussed. Most probably Tabasosphaera represents a foraminifer belonging to the group Lagenina.
Petrography And Geochemistry Of The Jajarm Bauxite Ore Deposit, Northeast Iran: Implications For Source Rock Material And Ore Genesis, Dariush Esmaeily, Hosein Rahimpour-Bonab, Amir Esna-Ashari, Ali Kananian
Petrography And Geochemistry Of The Jajarm Bauxite Ore Deposit, Northeast Iran: Implications For Source Rock Material And Ore Genesis, Dariush Esmaeily, Hosein Rahimpour-Bonab, Amir Esna-Ashari, Ali Kananian
Turkish Journal of Earth Sciences
The Jajarm bauxite deposit, northeast Iran, is the largest such deposit in Iran. The deposit is sandwiched between the Triassic Elika formation and the Jurassic Shemshak formation, housed within karstic features developed within the former unit. The deposit generally shows an internal layering defined by the following four distinct horizons (from bottom to top): (a) a lower argillaceous horizon, approximately 50-80 cm thick, is mainly composed of clay minerals that directly overlies the carbonate footwall (Elika formation); (b) a bauxitic clay layer approximately 2-3 m thick that consists mainly of hematite, kaolinite, anatase, and diaspore; (c) a red bauxite layer …
Subduction-Related Eocene Shoshonites From The Cenozoic Urumieh-Dokhrat Magmatic Arc (Qaleh-Khargooshi Area, West Of The Yazd Province, Iran), Ghodrat Torabi
Subduction-Related Eocene Shoshonites From The Cenozoic Urumieh-Dokhrat Magmatic Arc (Qaleh-Khargooshi Area, West Of The Yazd Province, Iran), Ghodrat Torabi
Turkish Journal of Earth Sciences
The fifth phase of Eocene volcanism in the central part of the Urumieh-Dokhtar magmatic arc (UDMA), comprises lavas with shoshonitic characteristics, ranging from trachybasalt to trachydacite. In shoshonites of the Qaleh-Khargooshi area, leucite changes to analcime, analcime to albite, sanidine to albite and anorthoclase, and clinopyroxene to albite. These reactions, together with other field, petrographic and geochemical features, are evidence of an original absarokitic magma which was changing to generate the different rock units. The parental magma of these shoshonites was produced by a low degree of partial melting from a metasomatized enriched mantle source. During the ascent of shoshonitic …
Fueling The Superpowers: What Role For Iran?, Hossein Askari
Fueling The Superpowers: What Role For Iran?, Hossein Askari
New England Journal of Public Policy
This article by Hossein Askari is taken from the proceedings of the EPIIC Symposium at Tufts University, February 2005