The International Journal of Mineralogy, published in August, announced that the International Mineral Society has newly approved minerals this year. The boron nitride minerals discovered by Chinese and foreign scientists have been approved and named “Bingsongâ€.
In recent years, the Research Institute of Geotechnical Engineering of the State Key Laboratory of Continental Structure and Dynamics of the Chinese Academy of Geological Sciences, under the leadership of Professor Yang Jingxuan, has conducted extensive cooperation with international counterparts and obtained a series of researches on porphyrite rocks and chromite ore ultrahigh-pressure minerals in the ophiolite. progress. They discovered diamonds in 10 ophiolitic rocks in 5 orogenic belts around the world; diamond inclusions in coesite and thorium ores were found in chromite ore; and nanoscale supers were found in coesite. High-pressure causes of special mineral inclusions such as titanium nitride and boron nitride. The composition analysis showed that the boron content of the pine is 48.54%, nitrogen content is 51.46%; the particle size is very small, the largest particle is only 1 micron, most of the particle size is nano-scale; the formation temperature is 1300 °C, the pressure is 10-15GPa, that is formed Depth greater than 300 kilometers.
The discovery of the pines and other series of ultrahigh-pressure minerals, and the discovery of deep minerals such as diamonds in various orogenic belts in the world, suggest that the mantle beneath the expanding ridges of the ocean carries a large amount of deep formed mantle minerals and their associated chromite upwelling. To the shallow part. This discovery provides a new interpretation of the internationally popular view of shallow chromite ore formation and will affect the understanding of the origin of ophiolite and oceanic crust.
Louis Leo, a professor at Stanford University in the United States, pointed out: “Ultrahigh-pressure minerals are found in the ophiolite chromite ore, which breaks the concept of traditional ophiolite chromite formed in high-temperature, low-pressure mid-ocean ridges or post-arc expansion environments. Discovering similar findings combined with other ophiolites evokes the interest in finding ultrahigh-pressure inclusions in the ophiolite chromite deposits around the world.†La Lisa Dopodzianskaya, Chairman of the UHV Committee also pointed out "The new discovery has opened up new research fields on the mainland material and the residual fragments of the peridotite-type peridotite mixture."
It is understood that the new mineral named Qingsong Mine is to commemorate Fang Qingsong (1939-2010), a researcher at the Geological Institute of the Chinese Academy of Geological Sciences. He made outstanding contributions to finding the first diamond in the Luobusa chromite ore in Tibet. (Reporter Wu Ying)
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