Ghodrat Torabi

Ghodrat Torabi
University of Isfahan · Department of Geology

Professor
Central Iran ophiolites and igneous rocks Geology Petrology Mineralogy Geochemistry

About

108
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October 2003 - present
University of Isfahan
Position
  • Professor (Full)

Publications

Publications (108)
Article
ABSTRACT The Eocene pluton intrudes the Paleozoic accretionary wedge in the Kal-e-Kafi area (NE of Anarak, Isfahan province, Central Iran). The results of the field studies, petrography evidences and chemical characteristics of minerals used to determine the nature and P-T condition of this thermal metamorphism. Metaperidotites units of this Paleot...
Article
Eocene volcanic rocks with basaltic-trachyandesite and trachybasalt composition which cross-cut the Cretaceous sedimentary rocks, are exposed in the northwestern part of the Central-East Iranian Microcontient (CEIM) (SE of Khur, Isfahan Province, Iran). The rock-forming minerals of these volcanic rocks are olivine (chrysolite and hyalosiderite, Mg#...
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Subduction initiation (SI) ophiolites are critical for reconstructing plate tectonic and magmatic evolution along ancient convergent margins. Here we integrate clinopyroxene and whole rock chemical compositions, whole rock Nd isotopic compositions, and zircon U-Pb geochronology to demonstrate that the Ashin ophiolite between the Torbat-e-Heydarieh-...
Article
The Paleozoic Jandaq ophiolite is situated in the western part of the Central-East Iranian microcontinent and is a remnant of the Paleo-Tethys oceanic crust. This ophiolite consists of mantle peridotites and serpentinized mantle peridotites, metagabbro, basic and ultrabasic metamorphosed dykes and lavas, metapyroxenite, amphibolite, rodingite and l...
Article
The Early Oligocene alkalibasalts exposed in the Central Toveireh area located in the southwest of Jandaq city in Isfahan Province (Iran) and northwest of the Central-East Iranian Microcontinent (CEIM). Field studies reveal that these alkalibasalts crosscut the Eocene calc-alkaline volcanic rocks and granitoids and covered by the Miocene sedimentar...
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Introduction In the northeastern part of the Isfahan province and 65 km northeast of the Anarak city (Kal-e-Kafi area), an I-type granitoid pluton cross cut the Paleozoic metamorphic rocks and Eocene volcanic rocks. In the contact of this granitoid body with sourrounding rock units, skarn and hornfels have been formed (Ahmadian, 2012; Ranjbar, 2010...
Article
In southwest of the Jandaq City (northeast of Isfahan Province) and northwest of the Central-East Iranian Microcontinent (CEIM), the Eocene dykes with trachy-andesitic composition cross cut the quartz monzodioritic intrusion. The texture of these dykes is granular, intergranular and porphyritic. The studied dykes are composed of plagioclase (andesi...
Article
This study investigates relicts of some granitic Gondwanan basement unexpectedly outcropping in the northwest of Central-East Iranian Microcontinent (CEIM) and incorporated into an ophiolitic mélange. Based on petrographical (e.g. high modal content of muscovite (~10 vol.%), absence of hornblende, inherited zircons (>541 Ma)), geochemical (peralumi...
Article
Abstract—The combination of geochemical analyses and geochronological data of Eocene volcanic rocks reveals a gradual shift in the dominant magmatic series from calc-alkaline to high-K calc-alkaline and shoshonitic in Central Iran. Transitional high-K calc-alkaline Eocene volcanic rocks with predominantely trachy- andesite composition are exposed i...
Article
The Eocene felsic stock and dike swarm with intermediate composition from Central Iran (southwest of Jandaq) are studied to understand geodynamic evolution of the Central-East Iranian Microcontinent (CEIM). Field relationships show that the dikes, composed of trachyandesite and basaltic trachyandesite, cross-cut the felsic stock. Whole rock geochem...
Conference Paper
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The Nain-Ashin ophiolites belong to the highly dismembered Mesozoic ophiolitic complexes bordering the central-east Iranian microplate (CEIM) and therefore represent a key area for reconstructing the tectono-magmatic and geodynamic evolution of central Iran. These ophiolites are mainly represented by mantle peridotites, though minor pillow lavas an...
Article
Chemical compositions of Fe-Mg biotite have been used to understand the petrogenesis of metamorphic and igneous rocks. However, biotite is affected by sub-solidus hydrothermal alteration, metamorphism, and chemical exchange with other common coexisting phases such as garnet and muscovite. Therefore, the interpretation of igneous and metamorphic pro...
Article
Introduction Granitoids are the main rock units in the continental crust. Study of granitoids reveals significant information on tectonic mantle and upper crust. Many researchers have investigated petrogenesis and origin of granitoids (e.g., Chappell and White, 2001; Barbarin, 1999; Frost et al., 2001). For example, Chappell and White (1992), Pitch...
Article
The petrography and mineral chemistry of the metamorphosed lherzolite in Darreh-Deh massif (east of Nain Ophiolite, Central Iran) is investigated in order to find the calcium source for rodingitization and tremolitization. In comparison with olivine and orthopyroxene, the clinopyroxene has lower modal content and is more alteration-resistant. The m...
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The Anarak Paleozoic ophiolite with nearly east-west trend is located in the western part of the Central-East Iranian Microcontinent (CEIM). There are some leucocratic gabbros which are found as stocks and dykes that cross-cut the Anarak ophiolite. The studied gabbros are composed of clinopyroxene, amphibole, biotite, plagioclase, chlorite, epidote...
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In the center of Iran, Central-East Iranian Microcontinent (CEIM) was a part of Gondwana supercontinent in pre-Palaeozoic during Pan-African Orogeny. It is a zone of several tectonomagmatic and metamorphic episodes from Neoproterozoic to earliest Palaeozoic. In the north of CEIM, Airekan granite is a relic of Paleozoic magmatism in northern Gondwan...
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This study is focused on a plagioclase-bearing spinel lherzolite from Chah Loqeh area in the Neo-Tethyan Ashin Ophiolite. It is exposed along the west of left-lateral strike-slip Dorouneh fault in the northwest of Central-East Iranian Microcontinent. Mineral chemistry (Mg#olivine < ~ 90, Cr#clinopyroxene < ~ 0.2, Cr#spinel < ~ 0.5, Al2O3Orthopyroxe...
Article
The Middle Eocene Toveireh plutonic body is located in the western margin of the Central-East Iranian Microcontinent (CEIM). This plutonic body consists of granodiorite, syenogranite, and monzogranite compositions. Granodiorite is the most predominant rock unit, which is composed of quartz, plagioclase, K-feldspar, hornblende, and biotite main mine...
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In this study, some mantle lherzolites of Ashin ophiolite are investigated which contain evidence of a geotectonic/metamorphism during exhumation and obduction of oceanic lithosphere on the continental crust, after closure of Neo-Tethys Ocean. The petrography and geothermobarometry indicate that these 4-phase lherzolites were formed in the lithosph...
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[PUBLISHED IN: NEW FINDINGS IN APPLIED GEOLOGY] ***** The study of petrological findings and geochemical data of mafic and ultramafic rocks and related petrographic units in the ophiolites can be an introduction to environmental geology studies, agriculture and natural resources. Regarding the urban and rural areas of Nain to Ashin in the vicinit...
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The Nain and Ashin ophiolites consist of Mesozoic mélange units that were emplaced in the Late Cretaceous onto the continental basement of the Central-East Iran microcontinent (CEIM). They largely consist of serpentinized peridotites slices; nonetheless, minor tectonic slices of sheeted dykes and pillow lavas - locally stratigraphically associated...
Conference Paper
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Melt-impregnated plagioclase lherzolites from Nain mélange, Iran, contain pyroxenes which are enriched and chemically zoned in Sr. The pyroxenes from the lherzolite as well as from clinopyroxenite seams, which have been precipitated from the impregnating melt, show similar trace element chemical characteristics including a similar positive Sr anoma...
Article
The Lower Oligocene Kal-e-kafi (East of Anarak, Central Iran) lamprophyres occur as stocks and dikes, which cross-cut the Eocene volcanic and Cretaceous sedimentary rocks. The predominant minerals of these lamprophyres are hornblende (magnesiohastingsite) and clinopyroxene (diopside) phenocrysts set in a fine- to medium-grained matrix of the same m...
Article
The Ashin ophiolite is situated in the western part of Central Iran and presents two stages of Jurassic and Cretaceous spreading. The Ashin ophiolite represents fragments of the Neo-Tethys oceanic lithosphere. Plagiogranite intrusions of this ophiolite have good exposures. Plagiogranites of Cretaceous are more fresh than the metamorphosed samples o...
Conference Paper
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The early Oligocene alkali basalts are cropped out in the Central Toveireh area in the southwest of Jandaq and northwest of Central-East Iranian Microcontinent (CEIM). Field studies show that in this region, the faults’ function, especially the Great-Kavir fault, and occurrence of an extension zone have caused rapid ascent of magma, and therefore,...
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The Anarak ophiolite, with E-W trending, located at north of Anarak. In addition to the gabbros in Anarak ophiolite sequence, intrusion of metasomatized gabbros injected into the ophiolite of Anarak in the form of stocks and dykes. metasomatized gabbros are younger than Anarak ophiolite and older than Anarak metamorphic assemblage and contain diops...
Conference Paper
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The Nain-Ashin ophiolites belong to so-called “Inner ophiolitic belt” of Iran, which consists of highly dismembered Mesozoic ophiolitic complexes bordering the central Iranian microplate (CIM). They therefore represent a key area for reconstructing the tectono-magmatic and geodynamic evolution of central Iran, which is still poorly known. The Nain-...
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Lamprophyric dykes and stocks of the Kal -e- kafi area (Central Iran, West of Yazd Block) are, cross-cut the Early to Middle Eocene volcanics and other older rock units such as Cretaceous limestone. These lamprophyres are mainly composed of hornblende (Magnesiohastingsite), clinopyroxene (diopside) and plagioclase (labradorite to Bytownite) as phen...
Conference Paper
An extensive, worldwide database on the geochemistry of basalts from well-known tectonic settings is available. Knowing the chemistry of basalts on one hand, and the tectonic setting of their origin on the other hand, resulted in the development of tectonic discrimination diagrams. Recently developed discrimination diagrams allow us to determine th...
Conference Paper
An extensive, worldwide database on the geochemistry of basalts from well-known tectonic settings is available. Knowing the chemistry of basalts on one hand, and the tectonic setting of their origin on the other hand, resulted in the development of tectonic discrimination diagrams. Recently developed discrimination diagrams allow us to determine th...
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Full-text available
Some dark green fragments of amphibolites are found within skarns at the south of Nain Ophiolite at the northeast of Nain city. They are similar to ortho-amphibolites (metamorphosed basic rocks) of this ophiolite in hand specimen, but mineralogically they are composed of amphibole (magnesio-hornblende, Mg#>0.95), clinopyroxene (diopside, Mg#~0.61),...
Article
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The Naein ophiolite is the most complete ophiolitic exposure in Cental Iran and considered as a remnant of the Mesozoic Central East Iranian microcontinent (CEIM) confining oceanic crust. In the northeastern part of this ophiolite (Darreh Deh area) within the mantle peridotites, a few hundred meters below the top of the Moho transition zone (MTZ),...
Conference Paper
Full-text available
An extensive, worldwide database on the geochemistry of basalts from well-known tectonic settings is available. Knowing the chemistry of basalts on one hand, and the tectonic setting of their origin on the other hand, resulted in the development of tectonic discrimination diagrams. Recently developed discrimination diagrams allow us to determine th...
Article
Full-text available
Picrites are intruded within the mantle peridotites in Darreh Deh area (in the east of Nain Ophiolitic mélange). Based on petrography and mineral chemistry, these picrites are composed of olivine (chrysolite), clinopyroxene (diopside), and orthopyroxene (enstatite) showing a cumulate texture, and small amount (less than 10 volume%) of plagioclase a...
Article
Late Cretaceous Bayazeh dyke swarm is situated in the western part of the Central-East Iranian Microcontinent (CEIM). These dykes with a dominant northeast-southwest trend occur in the Eastern margin of the Yazd block. They cross cut the Lower Cretaceous sedimentary rocks. The length of the Bayazeh dykes occasionally reaches up to the 2 km. Rock fo...
Article
The Posht-e-Badam ophiolite is situated in the Central-East Iranian Microcontinent (CEIM) and central domain of the Posht-e-Badam Block. This ophiolite of Paleozoic age is a remnant of the Paleo-Tethys ocean. The rock suite comprises metamorphosed peridotites, metagabbro, ampbibolite and listwaenite. Peridotites form the most important rock types o...
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Clinopyroxene application at petrogenesis identification of volcanic rocks associated with salt domes from Shurab (southeast Gom) Key words: Clinopyroxene, Thermobarometry, Tectonomagmatic, Shurab, Qom Introduction: The study area is located in Shurab area that is about 50 Km southeast of Qom. Volcanic rocks of the Shurab area have basaltic compo...
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[PUBLISHED IN: JOURNAL OF ECONOMIC GEOLOGY] ***** Introduction Study of the petrology of the ophiolites as the relics of ancient oceanic lithosphere, is a powerful tool to reconstruct Earth’s history. Mantle peridotites have mostly undergone alteration and serpentinization to some extent. Thus, the relics of metamorphic signatures from the upper m...
Article
The Paleozoic Bayazeh ophiolite is situated in the western part of the Central-East Iranian microcontinent (CEIM). This ophiolite consists of serpentinised peridotites, metagabbros, metamorphosed ultrabasic dykes, metapicrites, serpentinites and metamorphosed listwaenites which are covered by Late Paleozoic schists and marbles. The unique petrologi...
Article
The Eocene dyke swarm with east-west general trend intrudes the Cretaceous sedimentary rocks in ∼25 km north of the Khur city (Central Iran). Some of the studied dykes can be followed for over 7 km, but the majority of exposures in the area are less than 5 km long. The dykes commonly exhibit a chilled contact with the wall rocks. These dykes are tr...
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[PUBLISHED IN: JOURNAL OF ECONOMIC GEOLOGY] ***** The Nain and Ashin ophiolites are located in the northeast of Isfahan Province and in the west of Central-East Iranian Microplate. Pillow lavas are one of the most significant Cretaceous rock units. The lower partial melting degree in mantle peridotites of Ashin ophiolite, and the derived melt by me...
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The Nain Ophiolite is one of the most complete harzburgitic-ophiolite suites exposed along the Nain-Baft Fault, around the Central-East Iranian Microcontinent (CEIM). It is a remnant of the Nain Ocean (Early Jurassic to upper Early Cretaceous-Paleocene). During the Cretaceous (~Albian to Cenomanian), ascending melts and serpentinization overprinted...
Article
Melt impregnated plagioclase lherzolites from the Nain mélange, central Iran, contain pyroxenes enriched and chemically zoned with Sr. Pyroxenes from the lherzolite and the clinopyroxenite seams, which have been precipitated from the impregnating melt, show similar trace element geochemical characteristics, including a similar Sr anomaly. The assoc...
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The Oligocene alkaline basalts of Toveireh area (southwest of Jandaq, Central Iran) exhibit northwest–southeast to west–east exposure in northwest of the central-east Iranian microcontinent (CEIM). These basalts are composed of olivine (Fo70–90), clinopyroxene (diopside, augite), plagioclase (labradorite), spinel, and titanomagnetite as primary min...
Article
The western part of the Central-East Iranian microcontinent (CEIM) hosts the Anarak, Jandaq, Bayazeh and Posht-e-Badam ophiolites of Paleozoic age. The Bayazeh ophiolite is situated in the Eastern margin of the Yazd Block and is exposed along the Bayazeh Fault. This ophiolite consists of serpentinized peridotites, metagabbro, metamorphosed ultrabas...
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Detrital chromian spinels from adjacent sediment (recent sands and a Tertiary sandstone) were used to obtain a general view of the lithological and petrological characteristics of the Nain ophiolitic mélange, Iran. They display a wide chemical range in terms of Cr# (= atomic ratio), from 0.10 to 0.92. Except for some grains (11% of the total), the...
Conference Paper
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The Naein ophiolite is one of the most complete ophiolitic suits at the East of Central-East Iranian Microcontinent - ophiolitic belt and it comprises a high proportion of serpentinized mantle peridotites [1]. As a possible alteration product of Nain mantle peridotites, serpentine constructed the veinlets and the mesh texture, characterized with a...
Article
Late Paleozoic blueschists present good exposures in the Pateyar metamorphic complex (south of Chupanan, Isfahan Province). They are formed by metamorphism of primitive basaltic lavas. Petrography and microprobe analyses show that the studied rocks consist of glaucophane, actinolite, actinolitic hornblende, plagioclase (albite), sphene, magnetite,...
Article
There are two types of ophiolites in the western part of Central Iran: Mesozoic ophiolites (Naein and Ashin), and Paleozoic ophiolites (e.g., Anarak and Jandaq). Field studies show that the Mesozoic ophiolites contain considerable amounts of chromitite, but the Anarak and Jandaq ophiolites do not. Study of Mesozoic ophiolites reveals that they cont...
Article
Late Permian trondhjemites in the Anarak area occur as stocks and dykes, which cross cut the Anarak ophiolite and its overlying metasedimentary rocks, and are exposed along the northern Anarak east–west main faults. These leucocratic intrusive bodies have enclaves of all ophiolitic units and metamorphic rocks. They are composed of amphibole, plagio...
Article
The Surk ophiolitic melange, as a narrow belt, is located between the southwest of the Central Iran and Urumieh-Dokhtar magmatic arc, along the Naein-Dehshir-Baft fault. This ophiolitic melange consists of mantle peridotites (harzburgite, lherzolite and dunite in decreasing order), gabbro, diabasic dykes, dacite, serpentinite, listvenite, rodingite...
Conference Paper
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The Mesozoic ophiolitic mélanges of Nain and Ashin are located in the west of the Central East Iran Microplate, along the major faults of Nain-Baft and Dorouneh. It is a relict of Neotethys Ocean, covered by Paleocene-Eocene sediments. It has emplaced before the Paleocene at Upper Cretaceous [1], [2], [3], [4]. They comprises a wide range of rock u...
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The Mesozoic ophiolitic mélanges of Nain and Ashin-Zavar are located in the western part of the Central-East Iranian microcontinent (CEIM), along the major faults of Nain-Baft and Dorouneh. They contain two different groups of highly metamorphosed rocks (amphibolitic rocks, schists, marbles and quartzites) formed through metamorphism of oceanic bas...
Article
In western margin of the CEIM (Ashin area), Middle Eocene volcanic shoshonites present very good exposures. This shoshonitic association comprises of all shoshonite group members from basic to acidic. Major minerals of basic members (absarokite and shoshonite) are olivine, clinopyroxene (augite), plagioclase (labradorite), K-feldspar (sanidine and...
Article
In western part of the CEIM (Central-East Iranian Microcontinent) (Bayazeh area, Isfahan province, Iran), a series of Paleozoic basaltic rocks, occur. Major minerals of these basalts are olivine, clinopyroxene (diopside, augite), plagioclase (albite), sanidine, amphibole (kaersutite), phlogopite, ilmenite and magnetite. Secondary minerals include e...
Article
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Anarak Paleozoic ophiolite is located in westernpart of the Central – East Iranian Microcontinent. This metaophiolite is covered by Paleozoic schist and marble. Blueschists of the Anarak ophiolite are exposed along the northern Anarak east–west main faults and are considered as remnants of the Paleo–Tethys suture zone in Central Iran. Anarak bluesc...
Article
Anarak Paleozoic ophiolite is located in western part of the Central - East Iranian Microcontinent. This metaophiolite is covered by Paleozoic schist and marble. Blueschists of the Anarak ophiolite are exposed along the northern Anarak east-west main faults and are considered as remnants of the Paleo-Tethys suture zone in Central Iran. Anarak blues...
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Paleozoic of Jandaq and Posht-e-Badam ophiolites and Mesozoic ophiolitic mélanges of Nain and Ashin are located in the western part of the Central East Iranian Microcontinent. They are metamorphic relicts within the amphibolite facies of Paleo-Tethys and Neotethys Oceans. Petrological and geochemical studies of these Paleozoic and Mesozoic ophiolit...
Article
Mantle peridotites of the Jandaq ophiolite are composed of metamorphosed lherzolite and harzburgite, with lherzolitic mineralogical and bulk chemical compositions prevailing over harzburgite. They are closely associated and isofacial with amphibolites and Paleozoic metasedimentary rocks (schist and marble). Rock forming minerals of metalherzolites...
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Mesozoic ophiolte melange of Nain is located in Central East Iranian microcontinent. Field studies and petrography indicate presence of three types of granitoids (plagiogranites, high-K granites, and tonalites) with different origins in ophiolitic mélange of Nain. Three granitoid types are different in mineralogy and are including of: (1) Plagiogra...
Conference Paper
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One of the rock units of Nain ophiolitic mélange is high-K granitoid. Their garnet is almandine in composition. According to petrography, garnets are igneous type and have originated from melting the high Ca and Al sediments. Application of Garnet-Muscovite thermometer for these rocks indicates an average temperature of 528 oC.
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[PUBLISHED IN: IRANIAN JOURNAL OF PETROLOGY] ***** In Borooni area (SW of Ardestan), which is a part of Uromiyeh – Dokhtar magmatic belt, the Miocene basaltic columnar-jointed dikes cross cut the Eocene volcanic rocks. These rocks contain the granitoid enclaves of Oligocene age and possibly, they are Miocene in age. The studied rocks are composed o...
Article
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This ophiolite has experienced several metamorphic events since its formation. During Jurassic times, a regional metamorphism (M1) caused the formation of amphibolitic rocks from the oceanic basic rocks. These amphibolites were often covered by skarns formed during M2 metasomatism of carbonates. There are also evidences claiming a retrograde region...
Conference Paper
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The Mesozoic ophiolitic Mélange of Nain, in Central-East Iran Microplate (CEIM) is composed of pelagic limestones, basalts and pillow lavas, plagiogranites, gabbros, pyroxenite, and mantle peridotites. In addition, the metamorphic rocks found in this ophiolite, are marble, schist, quartzite, banded metachert, skarn, amphibolitic rocks, spilite, met...
Article
Plagioclase lherzolites of Nain mélange, Iran, show peculiar textures that indicate melt impregnation: (1) droplet or bleb-like grains of plagioclase distributed in the peridotite matrix, (2) plagioclase-bearing clinopyroxenite seams, and (3) trails of plagioclase crosscutting pyroxene porphyroclasts. The textural characteristics show post-deformat...
Article
The Jandaq lamprophyres occur as eight mostly parallel dykes, which cross-cut Eocene volcanic and sedimentary rocks of the Pis-Kuh Formation in dominant north to south direction. These lamprophyres are mainly composed of kaersutite, clinopyroxene, olivine, feldspar, ilmenite, and spinel as primary minerals. The rocks studied here are enriched in al...
Article
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[PUBLISHED IN: IRANIAN JOURNAL OF CRYSTALLOGRAPHY AND MINERALOGY] ****** Eocene volcanic rocks in NE of Ordib, have a very good exposures near and along the Turkmeni-Ordib fault. These rocks, that are situated in the inner part of the Central Iran and margin of the Yazd block, comprise trachyte, trachy-andesite and basaltic trachy-andesite. Trachy-...