GEOCHEMICAL SPECIFICATIONS AND PETROGENSIS OF FARIMAN MAFIC-ULTRAMAFIC ROCKS, WITH SPECIAL REFERENCE TO PLATE-TECTONICS

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NIMROOZI ATEFEH; MOAFPOURIAN GHOLAMALI

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Journal: GEOCHEMISTRY Year:2012 | Volume:1 | Issue:2 Page(s): 117-128

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Information Journal Paper

Title

GEOCHEMICAL SPECIFICATIONS AND PETROGENSIS OF FARIMAN MAFIC-ULTRAMAFIC ROCKS, WITH SPECIAL REFERENCE TO PLATE-TECTONICS

Author(s)

NIMROOZI ATEFEH | MOAFPOURIAN GHOLAMALI | Issue Writer Certificate

Keywords

ULTRAMAFICQ2

MAFICQ2

FARIMAN-TORBAT-E-JAMQ2

LINEAMENTQ2

Abstract

ULTRAMAFIC-mafic rocks and interbedded sedimentary rock association in the East of FARIMAN-TORBAT-E-JAM LINEAMENT, Northeast of Iran, are interpreted as Paleozoic ophiolite and the cited LINEAMENT is regarded as the suture of Paleo-Tethys ocean. However, our studies on petrography and geochemical characteristics of igneous rocks of foregoing sequence have revealed some evidence in contrast to previous ideas. For example field relations and microscopy observations demonstrate volcanic to subvolcanic origin of both MAFIC and ULTRAMAFIC rocks, and their distinctive geochemical properties compared to rocks the which formed at the subduction zone or constructive margins, including MORB or marginal basins. Various disequilibrium textures may be formed by undercooling of superheated melts. We have subdivided these rocks into komatiitic, picritic and tholeiitic varieties regarding to their different major, minor and trace elements composition which has reflected as various patterns in REE and spider diagrams. On the basis of ratios of incompatible immobile trace elements such as (Nb/Th) N versus (Nb/La) N, Nb/Th versus Zr/Y and La/Yb versus Th/Ta these rocks are similar to oceanic plate basalts (OPB). It is thus possible that regarding to their close spatial and temporal relations, and their position in Zr/Y versus Nb/Y diagram which have plotted upper than DNb line they had been originated from a heterogeneous mantle plum source. Such a conclusion may be derived as well on the basis of high Fo content of fresh olivines up to 0.93, in komatiitic and picritic rocks which make necessary presence of a hot melt with high MgO content.

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References

ماگمای افیولیتی و نقش آن در تکوین افیولیت های ایران، برداشت هایی از گدازه های الترابازیک با گرایش کوماتی ایتیشرق فریمان

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APA: Copy

NIMROOZI, ATEFEH, & MOAFPOURIAN, GHOLAMALI. (2012). GEOCHEMICAL SPECIFICATIONS AND PETROGENSIS OF FARIMAN MAFIC-ULTRAMAFIC ROCKS, WITH SPECIAL REFERENCE TO PLATE-TECTONICS. GEOCHEMISTRY, 1(2), 117-128. SID. https://sid.ir/paper/230893/en

Vancouver: Copy

NIMROOZI ATEFEH, MOAFPOURIAN GHOLAMALI. GEOCHEMICAL SPECIFICATIONS AND PETROGENSIS OF FARIMAN MAFIC-ULTRAMAFIC ROCKS, WITH SPECIAL REFERENCE TO PLATE-TECTONICS. GEOCHEMISTRY[Internet]. 2012;1(2):117-128. Available from: https://sid.ir/paper/230893/en

IEEE: Copy

ATEFEH NIMROOZI, and GHOLAMALI MOAFPOURIAN, “GEOCHEMICAL SPECIFICATIONS AND PETROGENSIS OF FARIMAN MAFIC-ULTRAMAFIC ROCKS, WITH SPECIAL REFERENCE TO PLATE-TECTONICS,” GEOCHEMISTRY, vol. 1, no. 2, pp. 117–128, 2012, [Online]. Available: https://sid.ir/paper/230893/en

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