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Information Journal Paper

Title

AN UNUSUAL ASSEMBLAGE OF TALC-PHENGITE-CHLORITE-K-FELDSPAR IN QUARTZ SCHISTS FROM THE NAHAVAND AREA, SANANDAJ-SIRJAN ZONE, IRAN

Pages

  243-252

Abstract

 For the first time, an unusual assemblage of talc-phengite-chlorite-K-feldspar was found in quartz schists from the SANANDAJ-SIRJAN ZONE in the NAHAVAND area in western Iran. The talc-bearing quartz schists occur as small bodies or lenses within pelitic schist layers and contain talc, phengite, chlorite, K-feldspar and quartz as major mineral constituents with subordinate amounts of calcite and graphite. Textural analysis revealed that talc, phengite, chlorite and K-feldspar are in sharp contact and no reaction rims between them were observed. Constructed petrogenetic gird in the K2O-FeO-MgO-Al2O3-SiO2-H2O (KFMASH) model system containing talc, phengite, chlorite, K-feldspar, phlogopite and kyanite with excess quartz and H2O shows that divariant assemblage of talcphengite-chlorite-K-feldspar is stable over a wide P-T range defined by the following two univariant reactions: phengite+talc+quartz=chlorite+K-feldspar+kyanite+H2O and chlorite+phlogopite+quartz=talc+ phengite+K-feldspar+H2O. Constructed Al2O3-KAlO2-MgO+FeO (AKM) compatibility diagrams predict that phengite (XPh=0.280, YPh=0.860), chlorite (XChl=0.570, YChl=0.640), talc (XTlc=0.160, YTlc=0.02) and Kfeldspar are stable at P=11 kbar and T=400oC. This relatively high-pressure assemblage could be formed during the subduction of the Neo-Tethys oceanic plate under Iranian microcontinent.

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    • Cite

    APA: Copy

    IZADYAR, J., MOJAB, S., KUROSHI, O., & ZARE, M.. (2014). AN UNUSUAL ASSEMBLAGE OF TALC-PHENGITE-CHLORITE-K-FELDSPAR IN QUARTZ SCHISTS FROM THE NAHAVAND AREA, SANANDAJ-SIRJAN ZONE, IRAN. IRANIAN JOURNAL OF SCIENCE AND TECHNOLOGY TRANSACTION A- SCIENCE, 38(A3), 243-252. SID. https://sid.ir/paper/627090/en

    Vancouver: Copy

    IZADYAR J., MOJAB S., KUROSHI O., ZARE M.. AN UNUSUAL ASSEMBLAGE OF TALC-PHENGITE-CHLORITE-K-FELDSPAR IN QUARTZ SCHISTS FROM THE NAHAVAND AREA, SANANDAJ-SIRJAN ZONE, IRAN. IRANIAN JOURNAL OF SCIENCE AND TECHNOLOGY TRANSACTION A- SCIENCE[Internet]. 2014;38(A3):243-252. Available from: https://sid.ir/paper/627090/en

    IEEE: Copy

    J. IZADYAR, S. MOJAB, O. KUROSHI, and M. ZARE, “AN UNUSUAL ASSEMBLAGE OF TALC-PHENGITE-CHLORITE-K-FELDSPAR IN QUARTZ SCHISTS FROM THE NAHAVAND AREA, SANANDAJ-SIRJAN ZONE, IRAN,” IRANIAN JOURNAL OF SCIENCE AND TECHNOLOGY TRANSACTION A- SCIENCE, vol. 38, no. A3, pp. 243–252, 2014, [Online]. Available: https://sid.ir/paper/627090/en

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