Magma genesis in the supra-subduction zone of the Piranshahr ophiolite complex based on the mineral chemistry of clinopyroxene in the North West basalts of Iran

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YAZDANI MARYAM

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Journal Paper

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Journal: Iranian Journal of Crystallography and Mineralogy Year:2019 | Volume:26 | Issue:4 Page(s): 989-1000

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Title

Magma genesis in the supra-subduction zone of the Piranshahr ophiolite complex based on the mineral chemistry of clinopyroxene in the North West basalts of Iran

Author(s)

YAZDANI MARYAM | Issue Writer Certificate

Keywords

Supra-subductionQ1

arc magmatismQ1

PiranshahrQ2

basaltQ2

clinopyroxeneQ2

Abstract

The Piranshahr ophiolitic complex is located in NW Iran, and at north west of the Piranshahr town. Tectonically, the NW Piranshahr ophiolitic complex is severely mé langed and the boundary of different units in this complex is undistinguishable. Piranshahr ophiolite includes ultramafic, mafic, sedimentary and metamorphic rocks. Mafic rocks with basalt and diabase compositions are exposed in several parts of the region. In this paper, clinopyroxene geochemistry of basaltic rocks are studied and compared with the similar rocks from other Supra-subduction zone-type of Eastern Mediterranean ophiolites. clinopyroxenes display diopsitic compositions within the range of (En0. 39-0. 59 Fs0. 01-0. 05 WO0. 50-0. 57), calc-alkaline nature with low Ti and high Mg content. High-Mg and low-Ti magma suggest a Supra-subduction zone setting for the formation of the Piranshahr ophiolitic basalts. According to the distribution of aluminum in clinopyroxenes, these minerals have formed at high oxygen fugacity and water content about 10 percent. The clinopyroxenes of the Piranshahr Ophiolite have similar chemical compositions to those of the other Supra-subduction zone-type Eastern Mediterranean ophiolites (e. g., Troodos, Varinous, Pindos and Oman ophiolites) that show arc affinity.

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APA: Copy

YAZDANI, MARYAM. (2019). Magma genesis in the supra-subduction zone of the Piranshahr ophiolite complex based on the mineral chemistry of clinopyroxene in the North West basalts of Iran. IRANIAN JOURNAL OF CRYSTALLOGRAPHY AND MINERALOGY, 26(4 ), 989-1000. SID. https://sid.ir/paper/385389/en

Vancouver: Copy

YAZDANI MARYAM. Magma genesis in the supra-subduction zone of the Piranshahr ophiolite complex based on the mineral chemistry of clinopyroxene in the North West basalts of Iran. IRANIAN JOURNAL OF CRYSTALLOGRAPHY AND MINERALOGY[Internet]. 2019;26(4 ):989-1000. Available from: https://sid.ir/paper/385389/en

IEEE: Copy

MARYAM YAZDANI, “Magma genesis in the supra-subduction zone of the Piranshahr ophiolite complex based on the mineral chemistry of clinopyroxene in the North West basalts of Iran,” IRANIAN JOURNAL OF CRYSTALLOGRAPHY AND MINERALOGY, vol. 26, no. 4 , pp. 989–1000, 2019, [Online]. Available: https://sid.ir/paper/385389/en

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