2篇
您的检索式：作者名="E.M.Kolesnikov"
|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | 1908年俄罗斯西伯利亚通古斯大爆炸物体性质的地球化学证据显示文摘用ICP-MS分析了西伯利亚中部通古斯地区的沉积物和附近的岩石样品,在1908年爆炸事件影响层中分别发现和证实了Pd,Ni,Co,REE,Ti和Sr等元素的异常,比背景值高出4~35倍.事件影响层中,Pd与Ni,Co,∑REE之间均具有良好的相关性,而这些元素在非事件层中则不具相关性,表明它们应具有相同的来源,即通古斯爆炸物体.事件影响层中REE的碳质球粒陨石标准化配分曲线比较平坦,而非事件层中的配分曲线更为陡峭,前者的(La/Yb)n为2.1~3.2,后者则为7.0~143.2;附近的岩石样品中REE与球粒陨石的比值为10~100,而事件影响层样品中的该比值为1左右;并且影响层的Ti/Ni比值以及Sr/Co比值与彗星的相近,表明这些元素异常不可能由地内物质污染所致,而是由通古斯爆炸事件引起的,爆炸物体的成分可能与碳质球粒陨石相似,很可能是彗星.此外,根据事件层中Pd的异常丰度,估算出爆炸物体的质量大于107吨,半径大于126m. | 谢烈文 侯泉林 E.M.Kolesnikov N.V.Kolesnikova | 2002 | 中国科学(D辑)2002，32，3： | 4 |
| 2 | Geochemical evidence for the characteristic of the 1908 Tunguska explosion body in Siberia,Russia显示文摘Twenty-two peat samples collected at different depths of a core including the layer affected by the 1908 explosion in Tunguska area of Central Siberia, Russia, and three basalt sampies collected near the site, are analyzed by ICP-MS. The concentrations of Pd, Ni, Co, ∑ REE,Ti and Sr in the event layers are 4-35 times higher than the background values in the normal layers. The variation of Pd is closely related to Ni, Co and ∑ REE in the event layers, but not to these elements in the normal layers. It indicates that these excess elements came from the same source,i.e. the Tunguska explosion body. In addition, the patterns of Cl-chondrite-normalized REE in the event layers ((La/Yb)N≈2-3) are much flatter than those in the normal layers ((La/Yb)N≈7-143),and differ from those in the three basalt samples. The concentrations of REE in the three basalt samples are tens times higher than those in the event layers. It may be inferred that these excess elements could not be produced by the contamination of the terrestrial material, but probably by the Tunguska explosion body, Additionally, the ratios of Ti/Ni and Sr/Co in the event layers are close to those in comet. It implies that the solid part of the explosion body was compositionally similar to carbonaceous chondrites (CI) and more probably a small comet. In terms of the Pd excess fluxes in the explosion area, it can be estimated that the celestial body that exploded over Tunguska in 1908 weighed more than 107 tons, corresponding to a radius of >126 m. | 谢烈文 侯泉林 E.M.Kolesnikov N.V.Kolesnikova | 2001 | Science China Earth Sciences2001，44，11： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员