MINERAL CHEMISTRY AND RETROGRADE TEMPERATURE-PRESSURE CONDITIONS OF OLBEARING MARBLES FROM THE TAKAB METAMORPHIC COMPLEX-NW IRAN

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HAJIALIOGHLI ROBAB

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Journal: Iranian Journal of Crystallography and Mineralogy Year:2012 | Volume:19 | Issue:4 Page(s): 615-626

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Title

MINERAL CHEMISTRY AND RETROGRADE TEMPERATURE-PRESSURE CONDITIONS OF OLBEARING MARBLES FROM THE TAKAB METAMORPHIC COMPLEX-NW IRAN

Author(s)

HAJIALIOGHLI ROBAB | Issue Writer Certificate

Keywords

DOLOMITIC MARBLESQ2

RETROGRADE METAMORPHIC EVOLUTIONSQ2

THERMO BAROMETRYQ2

TAKABQ2

NW IRANQ2

Abstract

The Precambrian TAKAB complex consists of various metamorphic rocks including metabasites, metaultramafic rocks, calc-silicates and marbles which are metamorphosed under green schist to granulite facies. The pick metamorphic rocks are retrogressively metamorphosed during crustal exhumation related to pressure and temperature decreasing as well as H2O-rich fluid infiltrations. Retrograde metamorphism of the Ol-bearing marbles caused their transformation from granulite to amphibolite facies. Some mineralogical and textural evidence of retrograde metamorphism in the TAKAB DOLOMITIC MARBLES are (a) appearance of low temperature and H2O-bearing phases such as tremolite, clinonochlore, (±) titanite and (±)epidote, (b) formation of tremolite+dolomite assemblages as pseudomorph after olivine and (c) titanite corona around ilmenite. The temperature and pressure of retrograde metamorphism are calculated by using mineral chemistry of the retrograde phases and the equilibria reactions at 650±25oC and 6.5±0.5kbar, respectively. The estimated temperatures and pressures are consistent with the amphibolites facies. Due to lack of appropriate chemical composition, retrograde tremolite is the stable phase of TAKAB DOLOMITIC MARBLES at the amphibolite facies. Retrograde clinochlore is appeared in the DOLOMITIC MARBLES having Al2O3 impurities at the high temperature amphibolite facies.

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APA: Copy

HAJIALIOGHLI, ROBAB. (2012). MINERAL CHEMISTRY AND RETROGRADE TEMPERATURE-PRESSURE CONDITIONS OF OLBEARING MARBLES FROM THE TAKAB METAMORPHIC COMPLEX-NW IRAN. IRANIAN JOURNAL OF CRYSTALLOGRAPHY AND MINERALOGY, 19(4), 615-626. SID. https://sid.ir/paper/4148/en

Vancouver: Copy

HAJIALIOGHLI ROBAB. MINERAL CHEMISTRY AND RETROGRADE TEMPERATURE-PRESSURE CONDITIONS OF OLBEARING MARBLES FROM THE TAKAB METAMORPHIC COMPLEX-NW IRAN. IRANIAN JOURNAL OF CRYSTALLOGRAPHY AND MINERALOGY[Internet]. 2012;19(4):615-626. Available from: https://sid.ir/paper/4148/en

IEEE: Copy

ROBAB HAJIALIOGHLI, “MINERAL CHEMISTRY AND RETROGRADE TEMPERATURE-PRESSURE CONDITIONS OF OLBEARING MARBLES FROM THE TAKAB METAMORPHIC COMPLEX-NW IRAN,” IRANIAN JOURNAL OF CRYSTALLOGRAPHY AND MINERALOGY, vol. 19, no. 4, pp. 615–626, 2012, [Online]. Available: https://sid.ir/paper/4148/en

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