Isotopic fractionation of alkaline earth metals in carbonate samples

2015 Fiscal Year Final Research Report

• Project/Area Number: 25800301
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Geochemistry/Cosmochemistry
• Research Institution: Gakushuin University
• Principal Investigator: Ohno Takeshi 学習院大学, 理学部, 助教 (40452007)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: 同位体分別 / 金属元素 / 炭酸塩鉱物 / MC-ICP-MS

Outline of Final Research Achievements

Carbonate precipitation experiments indicate the degree of isotopic fractionation of metal elements during the precipitation can be used as a new paleoenvironmental proxy. To investigate the relationship between the crystal structure and the degree of isotopic fractionation of alkaline earth metals, Mg K-edge XANES measurements were performed. As a result, it is revealed that the local structure around Mg atoms in calcite is different from that of aragonite, suggesting that the crystal structure of calcium carbonate can affect the degree of Mg isotopic fractionation.

Free Research Field

地球化学