| 黄土地层中奇异微颗粒的发现与初步研究 |
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| 引用本文： | 徐和聆,安芷生.黄土地层中奇异微颗粒的发现与初步研究[J].海洋地质与第四纪地质,1993,13(3):57-66. |
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| 作者姓名： | 徐和聆 安芷生 |
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| 作者单位： | 地质矿产部地质力学研究所，地质矿产部地质力学研究所，地质矿产部地质力学研究所，地质矿产部地质力学研究所，地质矿产部地质力学研究所，地质矿产部地质力学研究所，中国科学院西安黄土与第四纪地质开放研究实验室，中国科学院西安黄土与第四纪地质开放研究实验室，中国科学院西安黄土与第四纪地质开放研究实验室，中国科学院地球化学研究所，中国科学院地球化学研究所，中国科学院高能物理研究所，中国科学院高能物理研究所 北京 100081，北京 100081，北京 100081，北京 100081，北京 100081，北京 100081，西安 710061，西安 710061，西安 710061，贵阳 550002，贵阳 550002，北京 100080，北京 100080 |
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| 摘 要： | 通过蓝田段家坡黄土和红粘土剖面与第四纪3次巨大撞击事件年代相应的地层内奇异微颗粒的研究,将其划分为5种不同的形态类型,并主要据化学成分,将5类奇异微颗粒归纳为撞击、火山和生物等3种成因类型。文中还提出综合成因模式来解释不同奇异微颗粒赋存于同一撞击事件时段的地层及它们所显示的因果联系。
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| 关 键 词： | 黄土 撞击事件 微颗粒 第四纪 |
DISCOVERIES OF THE UNUSUAL MICROGRAINS IN THE LOESS STRATA AND THEIR PRELIMINARY STUDIES |
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| Xu Heling,Wu Xihao,Deng Jiwen Yin Weide,Jiang Fuchu,Xiao Huaguo.DISCOVERIES OF THE UNUSUAL MICROGRAINS IN THE LOESS STRATA AND THEIR PRELIMINARY STUDIES[J].Marine Geology & Quaternary Geology,1993,13(3):57-66. |
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| Authors: | Xu Heling Wu Xihao Deng Jiwen Yin Weide Jiang Fuchu Xiao Huaguo |
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| Abstract: | A number of unusual micrograins in very different colours and shapes have been found at three horizons of about 0. 7,1. 1-1. 3 and 2. 4Ma. B. P. respectively, just the periods when three impact events happened in the loess and red clay section of Duanji-apo, Lantian, Shaanxi.
According to their appearances observed through stereomicroscope and SEM,these micrograins can be divided into five shape types: (l)micrograin aggregate; (2)glassy mi-crospherolite; ( 3 ) bright micrograin; ( 4 ) trachytic micrograin and ( 5 ) hollow micro-spherolite with a tail. In addition,some of them have been determined through X-ray energy spectrum analysis, instrumental nuclear activation analysis and some other methods,and then the major and trace element data obtained. Based on the data,the following three genetic types can be made clear:: (l)impact micrograins,including cosmic dusts and microtectites; (2)volcanic micrograins,analogous to basaltic ashes and (S)biological micrograins, similar to fungus spores.
The phenomena that the unusual micrograins in different origins exist at the same horizons and appear at the same time can be explained by the model of comprehensive effects of extraterrestrial impacts,volcanic eruptions and forest conflagration. The process is like this:impact came first,then the volcanic eruption,and at last resulting in the for-est fires. That' s why the on-going studies have revealed there exist some traces of ex-traterrestrail impacts in the section. |
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| Keywords: | loess impact event volcanic eruption biological microspherolite model of comprehensive effect |
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