Abstract
The samples of microdiamond as an inclusion of Os Ir alloy, coesite, stishovite, high pressure form of Tio2, high pressure nitrides associated with SiC along with boron carbide, have been reported in the past from the placer deposits of Luobasa ophiolite of Yarlung Zangbo region of Tibet. For the formation of these ultra high findings, pressure in the range of 4 to 9 Gpa and temperature in the range of 700° C - 1300° C is required. Thus these minerals can either be incorporated into the chromitite in the deep upper mantle or they have an impact origin. In absence of impact crater, Prof. Fang and others have favored the mantle origin but for the formation of nitrides in the deep mantle, the source of N is not clear. However, the event of comet impact provides better explanation for the formation process. It also simplifies the explanation of coexistence of most of these minerals in a single crystal with the shallow origin and the perfect preservation of the coesite as consequence of rapid cooling after the shock metamorphism.
Highlights
UHP minerals in the Lubobusa ohphiolite have been a conundrum for some time
If we look at the associated minerals that are found with “Qingsongite” most of these minerals are known for their presence at impact sites
Most of the UHP phase minerals reported from Tibetan Ophiolite have undergone the transformation on the surface itself
Summary
UHP minerals in the Lubobusa ohphiolite have been a conundrum for some time. Earlier study “Diamond- and Coesite-bearing chromitites from the Luobusa Ophiolite” by Prof. In the event of mantle origin, perfect preservation of coesite crystal looks difficult considering its transportation process to the surface. Impact event of a comet can provide better explanation for these finds. Comet nuclei are composed of an amalgamation of rock, dust, water ice, frozen carbon dioxide, carbon monoxide, methane, and ammonia. In addition to these gases, the nuclei contain a variety of organic compounds, which may include methanol, hydrogen cyanide, formaldehyde, ethanol, and other complex molecules such as long-chain hydrocarbons and amino acids. We are attempting to focus on the possible formation process of UHP minerals in the event of comet impact and will try to explain their co-existence in the single crystal
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