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Global Cycle of Boron Isotopes in Modern and Fossil Marine Carbonates and Carbon Minerals

现代和化石海洋碳酸盐和碳矿物中硼同位素的全球循环

基本信息

批准号：
09640580
负责人：
NOMURA Masao
金额：
$ 1.09万
依托单位：
Tokyo Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1999
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09640580/
关键词：
Boric Acid Boron isotope Isotopic Ratio Carbonate Coral Fossil ホウ素珊瑚

项目摘要

The boron isotopic composition were measured about coral 28 samples collected on offing the Okinoerabu iland, the Tonaki island, and the Miyako island of the Okinawa southwest islands. The kind of coral used two species of helioporas, 20 species of acroporas, two species of montiporas, and four species of poriteses, respectively. Boron was separated from the about 6g sample by the methyl borate distillation, and the boron isotopic ratios were measure. Moreover, the determination of the element which exists in a sample was carried out by emission spectrochemical analysis. Consequently, Na, K, Li, Mg, Sr, Ba, and B were contained as main coexistence elements. Many Sr, Ns, and Mg were contained in it. As for some coral, the crystal form changed with coexistence of magnesium from the aragonite to the calcite in part. This is guessed from positive correlation being between magnesium concentration, and C / A ratio. There was no correlation between boron concentration or an isotopic ratio, and other chemistry components. Boron concentration was 20-50 ppm, the average was 40.95 ppm, and the standard deviation was ±7.23 ppm. Boron isotopic ratios are 4.107-4.158 (15.8-28.3% as deltaィイD111ィエD1B), the boron isotopic ratios in 26 samples of the others except heliopora are 4.133-4.158, and the average was set to 4.141. The standard deviation at this time was ±0.008, and was the variation in a very narrow sphere. This value showed theoretical calculation and very good coincidence. However, a difference is looked at by a coexistence element, the isotopic ratio, etc. between the coral of heliopora and others, and the boron isotopic ratio in the coral of heliopora showed the in addition to this more low boron isotopic ratio. This is considered to suggest that it may be a certain biologically different isotope effect.

对采自冲绳西南诸岛的冲之寺武岛、户鸣岛和宫古岛近海的28个珊瑚样品进行了硼同位素组成测定。其中日光孔珊瑚2种，顶孔珊瑚20种，单孔珊瑚2种，多孔珊瑚4种。用硼酸甲酯蒸馏法从约6 g样品中分离出硼，并测定了硼同位素比值。此外，通过发射光谱化学分析进行样品中存在的元素的测定。因此，Na、K、Li、Mg、Sr、Ba和B作为主要共存元素被包含。其中含有较多的Sr、Ns和Mg，部分珊瑚由于Mg的共存，晶体形态发生了变化，由文石转变为部分方解石。这是从镁浓度和C / A比之间的正相关性推测的。硼浓度或同位素比值与其他化学成分之间没有相关性。硼浓度为20-50 ppm，平均值为40.95 ppm，标准偏差为±7.23 ppm。硼同位素比值为4.107-4.158（15.8-28.3%为δ-δ-D111-δ-D1 B），除日孔洞外，其余26个样品的硼同位素比值为4.133-4.158，平均值为4.141。此时的标准差为±0.008，并且是非常窄的球体内的变化。该值表明理论计算和非常好的符合。但是，从共存元素、同位素比等方面来看，日光珊瑚与其他珊瑚存在差异，除了硼同位素比更低之外，日光珊瑚中的硼同位素比也显示出差异。这被认为表明这可能是某种生物学上不同的同位素效应。