Investigations on mineral chemistry and P-T estimation for formation of diopside, garnet and coexisting minerals in the calc-silicate hornfelses from the Alvand metamorphic aureole, Hamadan, West of Iran

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GHORBANI H.; MOAZZEN M.; SAKI A.

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Journal: GEOSCIENCES Year:2016 | Volume:26 | Issue:101 Page(s): 139-146

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Title

Investigations on mineral chemistry and P-T estimation for formation of diopside, garnet and coexisting minerals in the calc-silicate hornfelses from the Alvand metamorphic aureole, Hamadan, West of Iran

Author(s)

GHORBANI H. | MOAZZEN M. | SAKI A. | Issue Writer Certificate

Keywords

Alvand batholithQ2

Calc-silicate hornfelsQ1

Fluid compositionQ1

Temperature-pressureQ1

HamedanQ2

Abstract

Calc-silicate hornfelses are resulted from temperature excreted from the Alvand batholith on the surrounding carbonate rocks. Metamorphic minerals in these rocks are vesuvianite + garnet+clinopyroxene+ tremolite/actinolite+quartz+calcite± epidote. Calc-silicate minerals occurred in two stages of prograde and retrograde metamorphism. Mineral chemistry of clinopyroxene and garnet in Calc-silicate hornfelses determined by EPMA shows that these minerals are mainly diopside and grossular. Based on clinopyroxene-garnet thermometry with coexisting minerals such as tremolite/actinolite, quartz, . . . temperature of ~550˚ C was calculated for metamorphism of the clac-silicate hornfelses. Pressure of metamorphism was estimated to be about 3. 5 Kbar. Fluid composition in the Calc-silicate hornfelses had XCO2 = 0. 2 which indicates that during prograde metamorphism carbonate minerals reacted out and the amount of these minerals was reduced in the rocks.

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APA: Copy

GHORBANI, H., MOAZZEN, M., & SAKI, A.. (2016). Investigations on mineral chemistry and P-T estimation for formation of diopside, garnet and coexisting minerals in the calc-silicate hornfelses from the Alvand metamorphic aureole, Hamadan, West of Iran. GEOSCIENCES, 26(101 ), 139-146. SID. https://sid.ir/paper/31838/en

Vancouver: Copy

GHORBANI H., MOAZZEN M., SAKI A.. Investigations on mineral chemistry and P-T estimation for formation of diopside, garnet and coexisting minerals in the calc-silicate hornfelses from the Alvand metamorphic aureole, Hamadan, West of Iran. GEOSCIENCES[Internet]. 2016;26(101 ):139-146. Available from: https://sid.ir/paper/31838/en

IEEE: Copy

H. GHORBANI, M. MOAZZEN, and A. SAKI, “Investigations on mineral chemistry and P-T estimation for formation of diopside, garnet and coexisting minerals in the calc-silicate hornfelses from the Alvand metamorphic aureole, Hamadan, West of Iran,” GEOSCIENCES, vol. 26, no. 101 , pp. 139–146, 2016, [Online]. Available: https://sid.ir/paper/31838/en

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