Chromium spinels in North Chinese kimberlites,Huabei platform |
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| Authors: | Gao Xiaoying T V Posukhova |
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| Institution: | 1.CAS Key Laboratory of Crust-Mantle Materials and Environments, School of Earth and Space Sciences,University of Science and Technology of China,Hefei,China;2.Chair of Mineralogy, Faculty of Geology,Moscow State University,Moscow,Russia |
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| Abstract: | Samples from diamondiferous pipes in the Mengyin and Fuxian regions were investigated. The chemical compositions of Cr spinels
in kimberlites of China were found to be similar to those in kimberlites of the Arkhangelsk province in Russia. A long and
complex evolution that was individual for each pipe was demonstrated. The kimberlites of the Shandong Province proved to be
rich in high-Cr chromites. This means that the kimberlites formed at large depths in the field of diamond thermodynamic stability.
Variations in the redox conditions were noted. They manifested themselves as a wide range of fluctuations of the chemical
composition of microcrystalline spinels, up to formation to Ti-magnetite and magnetite. |
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