Micro-diamonds in Kazakhstan UHPM garnet distribution analysis

• Main Authors: Lin cheng-Feng, 林政鋒
• Other Authors: Liu Teh-Ching
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/642387

碩士 === 國立臺灣師範大學 === 地球科學系 === 96 === Geologists have discovered tiny inclusions of diamond and coesite in container grains of garnet, clinopyroxene, and zircon from ultrahigh pressure metamorphic rocks within the Eurasia and Africa terrains, Micro-diamonds found in Kazakhstan and UHP groups of minerals appearance. The occurrence of micro-diamonds means that portions of this UHP crystal terrane were exhumed from depths exceeding 100 kilometers, as such depths are necessary for the formation of diamond. In brief, when the slabs subduction to the depth of the upper portion of the mantle and returned to shallow depths after recrystallization, The UHPM terrane formation, then graphite and quartz transform micro-diamonds and coesite in respectively. Thereafter upthrust, UHPM slabs return to the surface; According to the predecessor study, the micro-diamonds usually found in the crack of the mineral. This paper results from UHPM of the Kumdy-kol lake region, the area four samples as the experiment sample with Kokchetav of the North of Kazakhstan, Procedures of the experiment are Optics Microscope, Scanning Electron Microscope (SEM) and Ramon Laser Spectrometer, Identify the mineral petrology and distribution situation in the mineral of diamond, and use Energy Dispersive X-ray Spectrometer to analysis the content of carbon in the mineral. In Raman Spectrum experiment and software 3D-Max, the three-dimensional model distribution analysis and create are important to this thesis, the model provides more ideal chart, in the mineral of micro-diamonds distribution.