Micro- and nano-inclusions in a superdeep diamond from Sao Luiz, Brazil
Micro- and nano-inclusions in a superdeep diamond from Sao Luiz, Brazil
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巴西圣路易斯超深钻石中的微米和纳米夹杂物
DOI：
10.1134/s0016702916100062
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发表时间：
2016
影响因子：
0.8
通讯作者：
and H. Ishibashi
中科院分区：
文献类型：
--
作者：
H. Kagi;D.A. Zedgenizov;H. Ohfuji;and H. Ishibashi
我们报告了产自巴西圣路易斯的超深钻石中存在浑浊的微米和纳米包裹体，其中含有方镁石 (Mg, Fe)O 包裹体以及前桥锰矿 (Mg, Fe)SiO3 和菱铁矿 (Mg, Fe)2SiO4。场发射SEM和TEM观察表明，云状夹杂物由晶粒尺寸从数十纳米到亚微米的自形微夹杂物组成。浑浊包裹体的红外吸收光谱表明，水、碳酸盐和硅酸盐不是这些微米和纳米包裹体的主要成分，表明包裹体的主要成分不具有红外活性。一些内含物被认为含有原子序数低于碳的材料。目前纳米和微米夹杂物的矿物相尚不清楚。微束X射线荧光分析表明，微夹杂物中含有过渡金属（Cr、Mn、Fe、Co、Ni、Cu、Zn），可能为金属相或硫化物相。云状包裹体为过渡带或下地幔超深层钻石的生长环境提供了重要信息。
We report cloudy micro- and nano-inclusions in a superdeep diamond from São-Luiz, Brazil which contains inclusions of ferropericlase (Mg, Fe)O and former bridgmanite (Mg, Fe)SiO3and ringwoodite (Mg, Fe)2SiO4. Field emission-SEM and TEM observations showed that the cloudy inclusions were composed of euhedral micro-inclusions with grain sizes ranging from tens nanometers to submicrometers. Infrared absorption spectra of the cloudy inclusions showed that water, carbonate, and silicates were not major components of these micro- and nano-inclusions and suggested that the main constituent of the inclusions was infrared-inactive. Some inclusions were suggested to contain material with lower atomic numbers than that of carbon. Mineral phase of nano- and micro-inclusions is unclear at present. Microbeam X-ray fluorescence analysis clarified that the micro-inclusions contained transition metals (Cr, Mn, Fe, Co, Ni, Cu, Zn) possibly as metallic or sulfide phases. The cloudy inclusions provide an important information on the growth environment of superdeep diamonds in the transition zone or the lower mantle.