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Paper Information

Journal:   IRANIAN JOURNAL OF SCIENCE AND TECHNOLOGY TRANSACTION A- SCIENCE   SUMMER 2014 , Volume 38 , Number A3; Page(s) 243 To 252.
 
Paper: 

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

 
 
Author(s):  IZADYAR J.*, MOJAB S., KUROSHI O., ZARE M.
 
* DEPARTMENT OF GEOLOGY, UNIVERSITY OF ZANJAN, UNIVERSITY BLVD., ZANJAN, IRAN
 
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.

 
Keyword(s): HIGH-PRESSURE METAMORPHISM, NAHAVAND, SANANDAJ-SIRJAN ZONE, TALC-PHENGITE-K-FELDS PARASSEMBLAGE
 
 
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Click to 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. https://www.sid.ir/en/journal/ViewPaper.aspx?id=402745



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. 2014 [cited 2021May09];38(A3):243-252. Available from: https://www.sid.ir/en/journal/ViewPaper.aspx?id=402745



IEEE: 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, [online] 38(A3), pp.243-252. Available: https://www.sid.ir/en/journal/ViewPaper.aspx?id=402745.



 
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