STUDY OF AMPHIBOLITIC ROCKS IN THE OPHIOLITIC MELANGES OF NAIN AND ASHIN-ZAVAR

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TORABI G.; SHIR DASHTZADEH N.; NOURBEHESHT I.; PIRNIA T.

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Journal: RESEARCH JOURNAL OF UNIVERSITY OF ISFAHAN "SCIENCE" Year:2008 | Volume:29 | Issue:3 (GEOLOGY) Page(s): 109-128

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Title

STUDY OF AMPHIBOLITIC ROCKS IN THE OPHIOLITIC MELANGES OF NAIN AND ASHIN-ZAVAR

Author(s)

TORABI G. | SHIR DASHTZADEH N. | NOURBEHESHT I. | PIRNIA T. | Issue Writer Certificate

Keywords

OPHIOLITEQ3

ASHIN-ZAVARQ3

NAINQ3

AMPHIBOLITEQ3

AMPHIBOLITIC DIKEQ3

GEOTHERMOBAROMETRYQ3

WHOLE ROCK GEOCHEMISTRYQ3

Abstract

The AMPHIBOLITEs and AMPHIBOLITIC DIKEs are among the metamorphic rocks found in NAIN and ASHIN-ZAVAR ophiolitic mélanges. These rocks are produced by the regional metamorphism of basic rocks existing in these OPHIOLITEs including pillow lavas, basalts and djabasic dikes. Field studies in these two areas show that the foliated AMPHIBOLITEs and AMPHIBOLITIC DIKEs are in contact with mantle peridotites, so these rocks seem to be a part of the NAIN ophiolitic melange, and not exotic blocks carried by tectonic processes. In addition, a pertographic similarity is observed in AMPHIBOLITEs and AMPHIBOLITEs dikes of NAIN and ASHIN-ZAVAR. The common minerals in these rocks are amphibole, plagioclase, quartz, sphene, chlorite, calcite, prehnite and magnetite. The only difference is the presence of garnet and clinopyroxene, in the AMPHIBOLITEs and AMPHIBOLITIC DIKEs. The chemical analyses indicate rock forming-minerals in both areas are extremely similar in composition. According to the GEOTHERMOBAROMETRY the temperature and pressure gained for the ASHIN-ZAVAR AMPHIBOLITEs and AMPHIBOLITIC DIKEs are about 676Co and 2.9 to 6.8 Kbars. In addition, the temperature for the NAIN AMPHIBOLITIC DIKEs is about 770Co while the pressure range is between 6.4 to 6.8 Kbars. Application of ICP-MS and NAA methods for whole rock analyses demonstrate a tholeiitic composition for the studied rocks. Which could be formed in a mid-ocean ridge setting.

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APA: Copy

TORABI, G., SHIR DASHTZADEH, N., NOURBEHESHT, I., & PIRNIA, T.. (2008). STUDY OF AMPHIBOLITIC ROCKS IN THE OPHIOLITIC MELANGES OF NAIN AND ASHIN-ZAVAR. RESEARCH JOURNAL OF UNIVERSITY OF ISFAHAN "SCIENCE", 29(3 (GEOLOGY)), 109-128. SID. https://sid.ir/paper/55910/en

Vancouver: Copy

TORABI G., SHIR DASHTZADEH N., NOURBEHESHT I., PIRNIA T.. STUDY OF AMPHIBOLITIC ROCKS IN THE OPHIOLITIC MELANGES OF NAIN AND ASHIN-ZAVAR. RESEARCH JOURNAL OF UNIVERSITY OF ISFAHAN "SCIENCE"[Internet]. 2008;29(3 (GEOLOGY)):109-128. Available from: https://sid.ir/paper/55910/en

IEEE: Copy

G. TORABI, N. SHIR DASHTZADEH, I. NOURBEHESHT, and T. PIRNIA, “STUDY OF AMPHIBOLITIC ROCKS IN THE OPHIOLITIC MELANGES OF NAIN AND ASHIN-ZAVAR,” RESEARCH JOURNAL OF UNIVERSITY OF ISFAHAN "SCIENCE", vol. 29, no. 3 (GEOLOGY), pp. 109–128, 2008, [Online]. Available: https://sid.ir/paper/55910/en

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