Journal
JOURNAL OF GEODYNAMICS
Volume 52, Issue 3-4, Pages 304-320Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jog.2011.03.001
Keywords
Zagros thrust; Iran; Back-arc basin; Island arc; U-Pb dating; Sr-Nd isotopes
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Funding
- University of Kurdistan (UOK)
- Grants-in-Aid for Scientific Research [23510005] Funding Source: KAKEN
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The Zagros thrust is a suture zone 10-15 km wide and 800 km long between the Arabian and Iranian plates, extending NW-SE in the west of Iran. Along this zone, some dismembered ophiolite. Eocene volcanic and some gabbroic to dioritic bodies crop out. The basaltic rocks have a zircon U-Pb age of 54.6 Ma; some gabbroic to dioritic bodies have ages of 36.75 +/- 0.51 Ma and 36.63 +/- 0.40 Ma, and they are rich in LILE and LREE relative to the N-MORB. High (Sr-87/Sr-86)i and low (Nd-143/Nd-144)i ratios relative to the MORB show that the slab fluid had a greater effect in the evolution of the source magma. The geochemical data infers that the basaltic rocks in the western part, Kamyaran basalt, were produced in an active margin such as an island arc. Geochemical features of gabbroic bodies and Oskul basalts indicate back arc basin-like N-MORB activity. Their chemical compositions and initial isotope ratios of Sr-87/Sr-87 and Nd-143/Nd-144 confirm that all the basaltic and gabbroic bodies along the Zagros fault in the study area were originated from the depleted mantle in the Cenozoic. It is possible that the complex was part of the supra subduction zone ophiolite, which cropped out in the collision of Arabian and Iranian plateau, probably in the Miocene or later. (C) 2011 Elsevier Ltd. All rights reserved.
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