MINERALOGY, GEOCHEMISTRY AND LOW GRADE METAMORPHISM OF GREEN TUFFS OF KARAJ FORMATION IN HESARBON AREA (SOUTH WEST FIROOZKOOH)

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BAHRAMI SHIVA; TUTTI FARAMARZ; BARGHI MOHAMMAD ALI; PURMOGHADAM MAJID

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Journal: PETROLOGY Year:2017 | Volume:8 | Issue:29 Page(s): 171-188

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Title

MINERALOGY, GEOCHEMISTRY AND LOW GRADE METAMORPHISM OF GREEN TUFFS OF KARAJ FORMATION IN HESARBON AREA (SOUTH WEST FIROOZKOOH)

Author(s)

BAHRAMI SHIVA | TUTTI FARAMARZ | BARGHI MOHAMMAD ALI | PURMOGHADAM MAJID | Issue Writer Certificate

Keywords

GREEN TUFFS OF KARAJ FORMATIONQ1

SUBDUCTIONQ2

LOW GRADE METAMORPHISMQ2

HYDROTHERMAL FLUIDSQ1

HESARBONQ1

FIROOZKUHQ3

EAST OF CENTRAL ALBORZQ1

Abstract

Green tuffs of middle Eocene age in HESARBON area, south west of FIROOZKUH (East of Central Alborz) consist of a thick sequence of lithic-, crystal-, vitric-and calcareous-tuffs. Microscopic and x-ray diffraction studies show plagioclase (albite and oligoclase), alkali feldspar (sanidine), quartz, cristobalite, biotite and hornblende are the major minerals in the rocks studied. Secondary minerals such as analcime, chlorite, prehnite and clay minerals are mainly present in the groundmass of the rocks. Extensive tectonic activities have created a variety of structural features including numerous folds and faults and therefore, have caused the green tuffs to be crushed and converted to breccia tuffs in many parts. Veins and cavities are filled by considerable amounts of zeolitic minerals including heulandite group, clinoptilolite and natrolite along with calcite and secondary quartz. Based on geochemical data, they lie on the dacite and rhyodacite field showing a calc-alkaline nature in the corresponding diagrams. According to the chondrite and primitive mantle normalized diagrams of trace elements, negative anomalies of Eu, Nb, Ti, P and depletion of HFSE together with their position in the petrogenesis discrimination diagrams, it is most likely that these rocks are formed in the active continental margin of a SUBDUCTION zone. The existence of analcime and prehnite in the groundmass demonstrate that these rocks have undergone some degrees of low-grade metamorphism due to the overburden of the layers in the temperature range 200-300 °C. The present study shows that zeolite minerals filling the fractures and cavities of tuffs are precipitated by HYDROTHERMAL FLUIDS with a neutral pH to acidic.

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APA: Copy

BAHRAMI, SHIVA, TUTTI, FARAMARZ, BARGHI, MOHAMMAD ALI, & PURMOGHADAM, MAJID. (2017). MINERALOGY, GEOCHEMISTRY AND LOW GRADE METAMORPHISM OF GREEN TUFFS OF KARAJ FORMATION IN HESARBON AREA (SOUTH WEST FIROOZKOOH). PETROLOGY, 8(29 ), 171-188. SID. https://sid.ir/paper/196982/en

Vancouver: Copy

BAHRAMI SHIVA, TUTTI FARAMARZ, BARGHI MOHAMMAD ALI, PURMOGHADAM MAJID. MINERALOGY, GEOCHEMISTRY AND LOW GRADE METAMORPHISM OF GREEN TUFFS OF KARAJ FORMATION IN HESARBON AREA (SOUTH WEST FIROOZKOOH). PETROLOGY[Internet]. 2017;8(29 ):171-188. Available from: https://sid.ir/paper/196982/en

IEEE: Copy

SHIVA BAHRAMI, FARAMARZ TUTTI, MOHAMMAD ALI BARGHI, and MAJID PURMOGHADAM, “MINERALOGY, GEOCHEMISTRY AND LOW GRADE METAMORPHISM OF GREEN TUFFS OF KARAJ FORMATION IN HESARBON AREA (SOUTH WEST FIROOZKOOH),” PETROLOGY, vol. 8, no. 29 , pp. 171–188, 2017, [Online]. Available: https://sid.ir/paper/196982/en

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