PETROLOGY OF MANTLE PERIDOTITES IN NAEIN OPHIOLITIC MELANGE

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TORABI GH.; PIRNIA T.

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Paper Information

Journal: RESEARCH JOURNAL OF UNIVERSITY OF ISFAHAN "SCIENCE" Year:2008 | Volume:30 | Issue:1 (GEOLOGY) Page(s): 167-190

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Information Journal Paper

Title

PETROLOGY OF MANTLE PERIDOTITES IN NAEIN OPHIOLITIC MELANGE

Author(s)

TORABI GH. | PIRNIA T. | Issue Writer Certificate

Keywords

OPHIOLITEQ3

NAEINQ3

MANTLE PERIDOTITESQ3

THERMOMETRYQ3

BAROMETRYQ3

MELT/MANTLE INTERACTIONQ3

Abstract

The abundance of peridotite rocks in NAEIN OPHIOLITE is about of 70 percent of melange. The studied rocks are MANTLE PERIDOTITES of an oceanic lithosphere that have been emplaced in north of NAEIN in Late Cretaceous to Early Tertiary time. The petrographic and field studies, with mineralogical comparison of lherzolite, harzburgite and dunite, show transitional changes of lithology and mineralogy. The applied geothermoeters and barometers show that olivine-spinel equilibrium temperature in lherzolite is 730 and in harzburgite 778oC, but in contrast two pyroxene crystallization temperatures obtain 1092oC for lherzolite and 1219oC for harzburgite. Field and petrographical studies and difference between obtained temperatures by applied geothermometers and increasing trend of olivine-spinel geothermometry from lherzolite to dunite, reveal the melt/mantle reaction. Moreover, chemical analysis of spinels and olivine show that Cr# of spinels increase from lherzolite to dunite, but the Mg# of coexisting olivines decreases. This negative correlation in mentioned factor has been formed by increasing of the replacive olivines during melt/mantle reaction and incongruent melting of orthopyroxenes. Consequently, studied rocks are tectonites that have been affected by MELT/MANTLE INTERACTION.

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References

PETROLOGY, PETROFABRIC AND VARIOUS TYPES OF METAMORPHISM IN NAIN OPHIOLITIC MASSIF (CENTRAL IRAN)

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APA: Copy

TORABI, GH., & PIRNIA, T.. (2008). PETROLOGY OF MANTLE PERIDOTITES IN NAEIN OPHIOLITIC MELANGE. RESEARCH JOURNAL OF UNIVERSITY OF ISFAHAN "SCIENCE", 30(1 (GEOLOGY)), 167-190. SID. https://sid.ir/paper/56011/en

Vancouver: Copy

TORABI GH., PIRNIA T.. PETROLOGY OF MANTLE PERIDOTITES IN NAEIN OPHIOLITIC MELANGE. RESEARCH JOURNAL OF UNIVERSITY OF ISFAHAN "SCIENCE"[Internet]. 2008;30(1 (GEOLOGY)):167-190. Available from: https://sid.ir/paper/56011/en

IEEE: Copy

GH. TORABI, and T. PIRNIA, “PETROLOGY OF MANTLE PERIDOTITES IN NAEIN OPHIOLITIC MELANGE,” RESEARCH JOURNAL OF UNIVERSITY OF ISFAHAN "SCIENCE", vol. 30, no. 1 (GEOLOGY), pp. 167–190, 2008, [Online]. Available: https://sid.ir/paper/56011/en

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