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):
Message:
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 mélanged 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.
Article Type:
Research/Original Article
Language:
Persian
Published:
Iranian Journal of Crystallography and Mineralogy, Volume:26 Issue:4, 2019
Pages:
989 - 1000
magiran.com/p1919337  
روش‌های دسترسی به متن این مطلب
اشتراک شخصی
در سایت عضو شوید و هزینه اشتراک یک‌ساله سایت به مبلغ 300,000ريال را پرداخت کنید. همزمان با برقراری دوره اشتراک بسته دانلود 100 مطلب نیز برای شما فعال خواهد شد!
اشتراک سازمانی
به کتابخانه دانشگاه یا محل کار خود پیشنهاد کنید تا اشتراک سازمانی این پایگاه را برای دسترسی همه کاربران به متن مطالب خریداری نمایند!