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Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.14/1044210
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- Title
- Supra-subduction zone magmatism of the Neyriz ophiolite, Iran : constraints from geochemistry and Sr-Nd-Pb isotopes
- Related
- International geology review, Vol. 56, No. 11, (2014), p.1395-1412
- DOI
- 10.1080/00206814.2014.942391
- Publisher
- Taylor & Francis
- Date
- 2014
- Author/Creator
- Shafaii Moghadam, Hadi
- Author/Creator
- Zaki Khedr, Mohamed
- Author/Creator
- Chiaradia, Massimo
- Author/Creator
- Stern, Robert J
- Author/Creator
- Bakhshizad, Farzaneh
- Author/Creator
- Arai, Shoji
- Author/Creator
- Ottley, Chris J
- Author/Creator
- Tamura, Akihiro
- Description
- The Neyriz ophiolite along the northeast flank of the Zagros fold-thrust belt in southern Iran is an excellent example of a Late Cretaceous supra-subduction zone (SSZ)-related ophiolite on the north side of the Neotethys. The ophiolite comprises a mantle sequence including lherzolite, harzburgite, diabasic dikes, and cumulate to mylonitic gabbro lenses, and a crustal sequence comprising a sheeted dike complex and pillow lavas associated with pelagic limestone and radiolarite. Mantle harzburgites contain less CaO and Al₂O₃, are depleted in rare earth elements, and contain spinels that are more Cr-rich than lherzolites. Mineral compositions of peridotites are similar to those of both abyssal and SSZ- peridotites. Neyriz gabbroic rocks show boninitic (SSZ-related) affinities, while crustal rocks are similar to early arc tholeiites. Mineral compositions of gabbroic rocks resemble those of SSZ-related cumulates such as high forsterite olivine, anorthite-rich plagioclase, and high-Mg# clinopyroxene. Initial εNd(t) values range from +7.9 to +9.3 for the Neyriz magmatic rocks. Samples with radiogenic Nd overlap with least radiogenic mid-ocean ridge basalts and with Semail and other Late Cretaceous Tethyan ophiolitic rocks. Initial ⁸⁷Sr/⁸⁶Sr ranges from 0.7033 to 0.7044, suggesting modification due to seafloor alteration. Most Neyriz magmatic rocks are characterized by less radiogenic ²⁰⁷Pb/²⁰⁴Pb (near the northern hemisphere reference line), suggesting less involvement of sediments in their mantle source. Our results for Neyriz ophiolite and the similarity to other Iranian Zagros ophiolites support a subduction initiation setting for its generation.
- Description
- 18 page(s)
- Subject Keyword
- 040200 Geochemistry
- Subject Keyword
- 040300 Geology
- Subject Keyword
- 040400 Geophysics
- Subject Keyword
- SSZ magmatism
- Subject Keyword
- Cumulate gabbro
- Subject Keyword
- Forearc basalt
- Subject Keyword
- Late Cretaceous
- Subject Keyword
- Zagros
- Subject Keyword
- Ophiolite
- Resource Type
- journal article
- Organisation
- Macquarie University. Department of Earth and Planetary Sciences
- Identifier
- http://hdl.handle.net/1959.14/1044210
- Identifier
- mq:41282
- Identifier
- ISSN:0020-6814
- Identifier
- mq-rm-2013014171
- Identifier
- mq_res-se-530661
- Language
- eng
- Reviewed
Macquarie University ResearchOnline
