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| Characteristics and Their Geological Significances of Spinel Minerals of Kimberlite in Mengyin, Shandong Province |
| YANG Zhi-jun1,2, HUANG Shan-shan1, CHEN Yao-ming1, LEI Xue-ying1, LI Xiao-xiao1, ZENG Xuan1 |
1. College of Earth Science and Engineering Sun Yat-sen University, Guangzhou 510275, China;
2. Guangdong Provincial Key Lab of Geological Processes and Mineral Resource Survey, Guangzhou 510275, China |
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Abstract Spinel minerals, as a group of accessory minerals in kimberlite, were formed throughout the whole evolution process of kimberlite. The morphological and compositional characteristics of spinel minerals can be effectively used to decipher the evolution process of kimberlite magma. In order to figure out characteristics of spinel minerals of kimberlite in Mengyin, Shandong Province, those samples were observed and analyzed by using optic microscope, electron microprobe analysis (EMPA), scanning electron microscope (SEM) and LA-ICP-MS for their appearance characteristics and mineral compositions. The results show that spinel minerals in matrix of the Mengyin kimberlite generally are 20~60μm sized euhedral crystals with zoning texture. They are thought to be primary spinel. From the core to the edge of the zoning spinel minerals, the Cr contents are gradually decreased, whereas the Ti contents and Fe2+/(Fe2++Mg) values are gradually increased. Based on their morphologies, there are enhedral-subhedral crystals and atoll grains of spinel minerals. The various zonings of the spinel could be caused by various factors including the thermal interference of the environment, variations of the pressure and melt composition. These difference characteristics of spinel minerals in the Mengyin kimberlite indicate that the kimberlite had experienced a long term complex evolution process.
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