Evidence from the Late Cretaceous Torbat-E-Heydarieh Ophiolite of NE Iran
Subduction initiation and back-arc opening north of Neo-Tethys: Evidence from the Late Cretaceous Torbat-e-Heydarieh ophiolite of NE Iran Hadi Shafaii Moghadam1,2,†, R.J. Stern3, W.L. Griffin2, M.Z. Khedr4, M. Kirchenbaur5,6, C.J. Ottley7, S.A. Whattam8, J.-I. Kimura9, G. Ghorbani1, S. Gain2, S.Y. O’Reilly2, and A. Tamura10 1School of Earth Sciences, Damghan University, Damghan 36716-41167, Iran 2 ARC Centre of Excellence for Core to Crust Fluid Systems and GEMOC ARC National Key Centre, Department of Earth and Planetary Sciences, Macquarie University, NSW 2109, Australia 3Geosciences Department, University of Texas at Dallas, Richardson, Texas 75083-0688, USA 4Department of Geology, Faculty of Science, Kafrelsheikh University, 33516 Kafr Elsheikh, Egypt 5Institut für Mineralogie, Leibniz Universität Hannover, Germany 6Universitat zu Koln, 50674 Koln, Germany & Steinmann-Institut, Universitat Bonn, Germany 7Department of Earth Sciences, Northern Centre for Isotopic and Elemental Tracing, University of Durham, Durham, DH1 3LE, UK 8Department of Geosciences, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia 9Department of Solid Earth Geochemistry, Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Natsushima-Cho 2-15, Yokosuka 237-0061, Japan 10Department of Earth Sciences, Kanazawa University, Ishikawa 920-1192, Japan ABSTRACT indicating that the THO formed during the classified ophiolites into continental margin, Late Cretaceous and was magmatically ac- mid-ocean-ridge, plume, supra-subduction zone, How new subduction zones form is an on- tive for ∼7 m.y. THO igneous rocks have vari- volcanic arc, and accretionary types, according going scientific question with key implications able εNd(t) of +5.7 to +8.2 and εHf(t) rang- to their tectonic settings.
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