Supra-subduction zone magmatism of the Neyriz ophiolite, Iran: constraints from geochemistry and Sr-Nd-Pb isotopes

被引:55
|
作者
Moghadam, Hadi Shafaii [1 ]
Khedr, Mohamed Zaki [2 ,3 ]
Chiaradia, Massimo [4 ]
Stern, Robert J. [5 ]
Bakhshizad, Farzaneh [1 ]
Arai, Shoji [2 ]
Ottley, Chris J. [6 ]
Tamura, Akihiro [2 ]
机构
[1] Damghan Univ, Sch Earth Sci, Damghan, Iran
[2] Kanazawa Univ, Dept Earth Sci, Kanazawa, Ishikawa 9201192, Japan
[3] Kafrelsheikh Univ, Dept Geol, Fac Sci, Kafr Al Sheikh, Egypt
[4] Univ Geneva, Dept Mineral, Geneva, Switzerland
[5] Univ Texas Dallas, Dept Geosci, Richardson, TX 75083 USA
[6] Univ Durham, Northern Ctr Isotop & Elemental Tracing, Dept Earth Sci, Durham DH1 3LE, England
关键词
SSZ magmatism; cumulate gabbro; forearc basalt; Late Cretaceous; Zagros; ophiolite; KIZILDAG HATAY OPHIOLITE; IZU-BONIN-MARIANA; MINERAL CHEMISTRY; OMAN OPHIOLITE; TECTONIC ENVIRONMENT; TROODOS OPHIOLITE; KURDISTAN REGION; CHROMIAN SPINEL; SOUTHERN TURKEY; WHOLE-ROCK;
D O I
10.1080/00206814.2014.942391
中图分类号
P5 [地质学];
学科分类号
0709 ; 081803 ;
摘要
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 epsilon Nd(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 Sr-87/Sr-86 ranges from 0.7033 to 0.7044, suggesting modification due to seafloor alteration. Most Neyriz magmatic rocks are characterized by less radiogenic Pb-207/Pb-204 (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.
引用
收藏
页码:1395 / 1412
页数:18
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