| New Data About Cosmic Spherules and Microdiamonds from
Middle Pleistocene Selenge River Basin in North Mongolia |
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| 作者 | 单位 | E-mail | | D. DORJNAMJAA | Paleontological Center, Mongolian Academy of Sciences, Ulaanbaatar, Mongolia | mail: ddorj2001@ yahoo.com | | D. SELENGE | Paleontological Center, Mongolian Academy of Sciences, Ulaanbaatar, Mongolia | | | Ts. AMARSAIKHAN | Paleontological Center, Mongolian Academy of Sciences, Ulaanbaatar, Mongolia | | | B. ENKHBAATAR | Paleontological Center, Mongolian Academy of Sciences, Ulaanbaatar, Mongolia | |
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| New Data About Cosmic Spherules and Microdiamonds fromMiddle Pleistocene Selenge River Basin in North Mongolia |
| This paper deals with new discovery of cosmic spherules and microdiamonds from Middle Pleistocene Selenge river basin on the Teel aggradation terrace.
The Teel aggradation terrace is located at the left edge of the Selenge River, at the pedestal of mountain Namnan uul (Dorjnamjaa et al., 2008). The Teel ter-race is those whose cusp and bench entirely composed of alluvial deposits. This indicates that the Selenge River has a long history of development, and had time to develop a flood plain and to deposit alluvium, through which it cut subsequently and left behind a Teel terrace. Alluvium studies may be of great practi-cal interest because in some areas, river terraces are veritable treasure-troves of economic minerals. With river terraces are associated most placer deposits of such important economic minerals as gold, platinum, diamond, etc. Numerous engineering projects, such as bridges(Kherlen, Tuul, Selenge, Orkhon, Baidrag, Zavkhan, etc.), dams (Ulaan Boom), hydropower plants(Durgun Nuur, Ulaan Boom) are built on alluvial deposits. Hence we need to know all the essential fea-tures of the geostructure of river terraces. Our investi-gation of the Selenge river terraces in 2006-2008 gave a possibility to discover the placer diamonds within the Teel aggradation terrace for the first time in Mongolia. |
| D. DORJNAMJAA,D. SELENGE,Ts. AMARSAIKHAN,B. ENKHBAATAR.2009.New Data About Cosmic Spherules and Microdiamonds fromMiddle Pleistocene Selenge River Basin in North Mongolia[J].Acta Geoscientica Sinica,30(S1):6-7. |
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