TY - JOUR T1 - Geochemistry and petrogenesis of basaltic flows in the Nain-Dehshir ophiolites TT - ژئوشیمی و پتروژنز جریانهای بازالتی در افیولیت های نائین-دهشیر JF - ijcmir JO - ijcmir VL - 16 IS - 4 UR - http://ijcm.ir/article-1-611-en.html Y1 - 2009 SP - 602 EP - 611 KW - Basalts KW - Diabases KW - Flat REE pattern KW - HFSE depletion KW - Back-arc basin. N2 - Diabases, pillow lavas and basaltic flows in the Nain-Dehshir ophiolites are marked with flat to slightly depleted pattern in REE chondrite-normalized diagram and are characterized by depletion in HFSE and enrichment in LILE. This geochemical behavior can be considered for lavas erupted in arc-related environments. Clinopyroxene in these rocks shows low content of TiO2 and resemble those found in island-arc tholeiites. These characteristics are consistent with back-arc formation during middle to upper Cretaceous, due to the oblique subduction of Neotethyan Ocean along the active continental margin of the central Iranian block. M3 ER -