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Licensed Unlicensed Requires Authentication Published by De Gruyter May 6, 2017

Deep mantle origin and ultra-reducing conditions in podiform chromitite: Diamond, moissanite, and other unusual minerals in podiform chromitites from the Pozanti-Karsanti ophiolite, southern Turkey

  • Dongyang Lian , Jingsui Yang EMAIL logo , Yildirim Dilek , Weiwei Wu , Zhongming Zhang , Fahui Xiong , Fei Liu and Wengda Zhou
From the journal American Mineralogist


The Pozanti-Karsanti ophiolite situated in the eastern Tauride belt, southern Turkey, is a well-preserved oceanic lithosphere remnant comprising, in ascending order, mantle peridotite, ultramafic and mafic cumulates, isotropic gabbros, sheeted dikes, and basaltic pillow lavas. Two types of chromitites are observed in the Pozanti-Karsanti ophiolite. One type of chromitites occurs in the cumulate dunites around the Moho, and the other type of chromitites is hosted by the mantle harzburgites below the Moho. The second type of chromitites has massive, nodular, and disseminated textures. We have conducted the mineral separation work on the podiform chromitites hosted by harzburgites. So far, more than 100 grains of microdiamond and moissanite (SiC) have been recovered from the podiform chromitite. The diamonds and moissanite are accompanied by large amounts of rutile. Besides zircon, monazite and sulfide are also very common phases within the separated minerals. The discovery of diamond, moissanite, and the other unusual minerals from podiform chromitite of the Pozanti-Karsanti ophiolite provides new evidences for the common occurrences of these unusual minerals in ophiolitic peridotites and chromitites. This discovery also suggests that deep mantle processes and materials have been involved in the formation of podiform chromitite.


We thank the Turkish geologists for assistance in the fieldwork, and the China National Research Center for the geochemical analyses. We appreciate Bin Shi from Chinese Academy of Geological Sciences for the SEM imaging and EDS analyses of these minerals. We also thank Paul T. Robinson, Julian A. Pearce, Changqian Ma, Cong Zhang, and Pengfei Zhang for their valuable suggestions in modifying this manuscript. Two reviewers, Sujoy Ghosh and Vincenzo Stagno, are greatly appreciated for their critical and constructive comments and suggestions that greatly improved the manuscript. We also thank Associate Editor Mainak Mookherjee and Editor Keith Putirka for their scientific contributions and handling of our paper. This research was funded by grants from the Ministry of Science and Technology of China (2014DFR21270), China Geological Survey (121201102000150069, 12120115027201, and 201511022), the International Geoscience Programme (IGCP-649), and the Fund from the State Key Laboratory of Continental Tectonics and Dynamics (Z1301-a20) and (Z1301-a22).

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Received: 2016-5-10
Accepted: 2016-12-23
Published Online: 2017-5-6
Published in Print: 2017-5-24

© 2017 by Walter de Gruyter Berlin/Boston

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