Mineral chemistry.

List of Articles Mineral chemistry.

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1 - Mineral chemistry and thermodynamics conditions of impure marbles formation from Neybaghi metamorphic complex, NE of Myaneh, Iran
Javad Izadyar

A metamorphic rock complex consists of slate, phyllite, micaschist and marble with NE – SW shistosity has cropped out in Neybaghi area in the NE of Myaneh. Impure marbles occur as thick and thin layers or massive bodies within the centeral area of this complex. Textura More

A metamorphic rock complex consists of slate, phyllite, micaschist and marble with NE – SW shistosity has cropped out in Neybaghi area in the NE of Myaneh. Impure marbles occur as thick and thin layers or massive bodies within the centeral area of this complex. Textural and mineralogical evidences, revealed two metamorphic stages. The early stage is testified by the minerals such as pyroxene (diopside), epidote (clinozoisite), amphibole 1 (edenite-pargasite) and plagioclase 1. The main stage have chlorite (clinochlore), phlogopite, amphibole 2 (tremolite) and plagioclase 2. P-T-XCO2 have been estimated for the early and main stage of metamorphism by computing nonideal and asymmetrical fugacity and activity and programing in THERMOCALC software for fluid and solid phases. The estimations give pressure, temperature and XCO2 of 9.5Kbar, 660°C and 0.35, whereas the main stage has been constrained at P=4.2Kbar, T=510°C, XCO2=0.4. The obtained P-T path shows that the Neybaghi marbles were formed under medium pressure condition and overprinted by a low pressure metamorphism. This type of P-T trend can be formed in collisional tectonic regime. Manuscript profile
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2 - Mineralogy and mineral chemistry of Pb- Ag- (Zn-Cu-Ba) Ravanj mining district, North of Delijan
Majid Ghasemi siani Fateme Isaabadi
20.1001.1.17357128.1399.14.55.2.3

The Ravanj ore deposit in the North of Delijan formed in the sedimentary host rocks. This ore mineralization system is controlled by normal faults, and mineralization occurs as massive, laminate, open space fillings, breccia and hydrothermal vein/veinlets ore bodies con More

The Ravanj ore deposit in the North of Delijan formed in the sedimentary host rocks. This ore mineralization system is controlled by normal faults, and mineralization occurs as massive, laminate, open space fillings, breccia and hydrothermal vein/veinlets ore bodies consisting of galena, sphalerite, fahlore group minerals, pyrite, chalcopyrite, dolomite, calcite, ankerite, barite, and quartz. Sulfide ore mineralization occurred within two mineralization horizons consisting of the massive-breccia ore horizon hosted by massive upper limestone (Km2) and layered sulfide ore horizon in middle shale (Ks2) and lower thin bedded limestone (Km1) as syn-sedimentary to epigenetic mineralization. Dolomitization is the main alteration related to mineralization and occurs adjacent to normal fault and consists of diagenetic and two hydrothermal dolomites. Hydrothermal dolomites are rich in iron. The ankrite shows that the ore hydrothermal fluid was Fe-rich. Chemistry of galena II and sphalerite II show that these minerals have a tendency to tetrahedrite-tennantite side which are consistent with presence of fahlore mineral incluisions in the microscopic studies. High Cd content in sphalerite and the presence of acanthite show that fluid mineralization had low temperature. According to the evidence such as mineralogy, mineral chemistry, ore texture and structures, and structural studies and combining these results with geochemistry, fluid inclusion and isotope geochemistry, the Ravanj ore deposit can be considered as an Irish-type Zn- Pb deposit. Manuscript profile
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3 - Mineral chemistry of clinopyroxene, an approach to petrogenesis of Saray Volcanic Complex–Northwest of Iran
M. Ghaderi N. Amel M. Moayyed
20.1001.1.17357128.1401.16.61.4.1

Saray volcano is an extinct volcano and is located in the east of Urmia Lake. This volcano mainly consists of Leucititic lava flows and their related pyroclastic materials forming a Sequence which repeated more than five times. Leucite phonolitic dykes, Lamprophyric (Mi More

Saray volcano is an extinct volcano and is located in the east of Urmia Lake. This volcano mainly consists of Leucititic lava flows and their related pyroclastic materials forming a Sequence which repeated more than five times. Leucite phonolitic dykes, Lamprophyric (Minette, Monchiquite and Spessartite) lavas and dykes, Trachytic domes and dykes, Syenitic dykes and a small syenitic stock are other rock types of Saray volcano. Since clinopyroxene is present in all rock types of this volcano, mineral chemistry study of clinopyroxenes in all rock types of Saray volcano, could help us to explain the relationship between different rock types. Clinopyroxenes of Saray volcano have diopside, salite and fassaite compositions. The majority of studied clinopyroxenes crystallize under 3-4 kb pressure and 1150 centigrade temperature. Tectono-magmatically speaking, these clinopyroxenes were mostly formed within plate basalts. Although the composition of rock types of Saray volcano is very different, almost constant composition of clinopyroxene in all rock types, show the same origin for all clinopyroxenes. However, it can be concluded that all rock types have the same origin. Manuscript profile

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List of Articles Mineral chemistry.