Analysis of carbon and oxygen stable isotopes in carbonate rocks by the laser micro-sampling technique

• Published in: Acta geochimica Vol. 32; no. 2; pp. 235 - 240
• Main Authors: Zheng, Ping, Wang, Lansheng, Yang, Yi, Gao, Xi, Zhang, Zhonghua
• Format: Journal Article
• Language: English
• Published: Heidelberg SP Science Press 01.06.2013; Springer Nature B.V
• Subjects: Carbon dioxide; Carbonate rocks; Dolomite; Earth and Environmental Science; Earth Sciences; Geochemistry; Oxygen; Stable isotopes; 同位素质谱仪; 微取样技术; 氧稳定同位素; 激光束聚焦; 真空系统; 碳酸盐岩; 碳酸盐胶结物; 稳定同位素分析; laser sampling; carbon and oxygen stable isotopes; carbonate composition
• ISSN: 1000-9426; 2096-0956; 1993-0364; 2365-7499
• DOI: 10.1007/s11631-013-0627-1

The analysis of stable isotopes of carbon and oxygen in different carbonate rocks by the phosphoric acid method is not easier than that by the laser sampling method developed in recent years, which optically focuses laser beams with sufficient energy on a micro area of a thin section in a vacuum sample box via microscope. CO2 produced by heating decomposition of carbonate was purified by the vacuum system, and the stable isotopic values of carbon and oxygen were calculated and analyzed on a mass spectrometer. This paper adopted the laser micro-sampling technique to analyze the stable isotopes of carbon and oxygen in dolomite, carbonate cement, stromatolite and different forms of dawsonite （donbassite）. Results indicated that the laser micro-sampling method is effective in analyzing carbonate composition and could be a convincing proof for justification on carbonate composition analysis.