Meteoric 10Be in volcanic materials and its behavior during acid-leaching

• Published in: Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms Vol. 223-224; pp. 591 - 595
• Main Authors: Shimaoka, Akiko, Sakamoto, Minoru, Hiyagon, Hajime, Matsuzaki, Hiroyuki, Kaneoka, Ichiro, Imamura, Mineo
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.08.2004
• Subjects: Acid-leaching; Be isotopic ratio; Meteoric 10Be; Volcanic sample; Weathering; Weathering; Be isotopic ratio; Volcanic sample; 91.65; Meteoric 10Be; Acid-leaching
• ISSN: 0168-583X; 1872-9584
• DOI: 10.1016/j.nimb.2004.04.109

We have investigated the chemical and isotopic behavior of beryllium (Be) during acid leaching for removing meteoric 10Be in volcanic samples. Determination of the Be isotopic ratio in the leachate was carried out using accelerator mass spectrometry (AMS) and inductivity coupled plasma mass spectrometer (ICP-MS). Elemental distribution of Be and other incompatible elements including boron (B) were also examined by ion microprobe (SIMS) for a deeper understanding of their chemical behavior in volcanic samples. SIMS analysis show that Be is concentrated in the groundmass together with B. However, the behavior of their elements during acid leaching is quite different. The Be concentration decreases through progressive leaching, while the concentration of B remains constant. Furthermore, the variation in the Be isotopic ratio after acid leaching is different between the two samples, neither of which has altered minerals under microscopic observation. It is demonstrated that meteoric 10Be resides in a rather narrow region of the rock and can be removed by acid leaching with minimum loss of the main host phase of Be.