Petrogenetic Evolution of Plio-Quaternary Mafic Lavas in Nehbandan (East Iran)

نویسندگان

  • Habib Biabangard Department of Geology,Sistan and Baluchestan University, Zahedan, Iran
  • Javad Mehdipour Ghazi Faculty of Earth Science, Shahid Beheshti University, Tehran, Iran
  • Mohammad Reza Ghasempour Faculty of Natural Resources and Earth Science, Shahrekord University, Shahrekord, Iran
  • Rahim Dabiri Department of Geology, Mashhad Branch, Islamic Azad University, Mashhad, Iran
چکیده مقاله:

Both the Sistan Suture Zone of eastern Iran and the Nehbandan Fault contain Plio-Quaternary Nehbandan mafic lavas. Positive anomalies in the large ion lithophile elements (LILE) and negative anomalies in Nb (niobium) exist in these mafic lavas. This indicates the occurrence of subduction magmatism and post-collision volcanism. Petrologic and geochemical analyses distinguished two groups of lava. Group I contains alkaline basalts with a slight depletion in Nb while Group II contains sub-alkaline basaltic andesite to andesite with a sharp depletion in Nb. Geochemical studies show that fractional crystallization and crustal contamination played an important part in the evolution of the Nehbandan lavas. Group II, however, was more greatly affected than Group I. Geochemical studies also indicate that these lavas may have been generated due to a low degree of partial melting (

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عنوان ژورنال

دوره 6  شماره 2

صفحات  133- 141

تاریخ انتشار 2014-09-23

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