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Granites and Earth Evolution:
geodynamic position, petrogenesis
and ore content of granitoid batholiths
First International Geological Conference
 

ORGANIZERS:

Geological Institute, Siberian Branch, Russian Academy of Sciences, Ulan-Ude

Institute of Earth's Crust, Siberian Branch, Russian Academy of Sciences, Irkutsk

Institute of Geochemistry, Siberian Branch, Russian Academy of Sciences, Irkutsk

Institute of Geology and Mineralogy, Siberian Branch, Russian Academy of Sciences, Novosibirsk

BAIKAL

     "Sacred sea", "sacred lake", "sacred water" - these names have been given to Lake Baikal since time immemorial by the indigenous population, by the Russians who came to these shores in the 17th century, and by foreign travelers in their admiration for its majestic and unearthly beauty.

     "We are not going to assure anyone that there's nothing more beautiful than Lake Baikal as each of us loves and adores his or her own birthplace. Still, Nature has its favorites which it creates with the particular zeal and endows with the special might.

     Such is Lake Baikal and there's no doubt about it. It possesses this magic vivifying power, the spirit not of the past, but of the present authentic grandeur and conserved might, which is not de-pendent on time and changes. One loses the feeling of time and measure of man's actions on the Earth looking at the severe and primordial beauty of the place. One can feel how the radiant eternity reigns open-handedly and regally over the clear water of ancient times.

     We, the people who live near Baikal can't say that we know it very well, as, it seems, it's next to impossible to learn and comprehend totally what it is like, and that's Lake Baikal here for. Still, after staying here for a short period of time and having watched infinitesimal amount of the beauty one can if not comprehend, but feel Baikal. The spirit of Baikal is something very special, existing and making one believe in old legends and think with mystic apprehension over the ability of a per-son do whatever he or she wants to do in certain places on the globe.

     The rare feeling of elevation and spirituality overwhelms you at Lake Baikal as if some secret mark of eternity and perfection touched you. Nowhere else will you obtain this sensation of such deep and wanted being one with nature and penetration into it. It's so hard to keep myself from ex-claiming once again: It's so great that Lake Baikal exists!.."
Valentin Rasputin

     The word Baikal is derived from the Turkish Bai-Kul, which means "a rich lake" (compare: Is-syk-Kul - a warm lake, Kara-kul - a black lake). Some authors believe this word to come from the Mongolian Baigal (rich fire) or Baigal-Dalai (large sea).

     Baikal is 31,500 square kilometers and equal to the area of such countries as Belgium, Nether-lands or Denmark. By its surface area Baikal ranks eighth among world's largest lakes. The total water volume on the Earth is about 1406 mln. cubic kilometers. Of them lakes and rivers contain 0.231 mln. cubic km. The volume of baikalian water mass is about 23.000 cubic kilometers. It is greater than the water volume contained in all five taken together Great Lakes in North America (Superior, Michigan, Huron, Erie, Ontario), in the Baltic, by 23 times greater than in Ladoga Lake. Lake Baikal contains one-fifth of the world's surface water resources (except ice of Antarctica, Green land and other glaciers), and four-fifth of fresh waters of Russia. Baikal is the deepest lake on the Earth. Its average depth is about 730 m. For the first time it was exactly calculated by G. Yu. Vereshagin in the 30's. The deepest known depth of Baikal (and lakes of the world) is 1637 m.

     The coastline is 456 m above ocean level. The coastline is a boundary between land and water surfaces. On the map it is drawn along the line of an average little water level. The real boundary between land and lake - the edge line - is constantly changing due to water fluctuations.

     Baikal is 20-25 mln. years old. But a modern shape Baikal acquired relatively recently, may be some million years ago. The total mineralization of the Baikal waters is 120 mg/l. The waters of Baikal belong to poorly mineralized soft waters. On average the share of hydrocarbonate calcium is about 84 %, chlorides and sulphates - 7 %, alkaline metals - 9 %. The chemical composition of wa-ter is comparatively homogeneous due to intensive mixing up. Baikal as a water body is filled up with surface waters. Rivers have no time to be saturated with salts, since crystalline rocks in their beds are difficult to dissolve, hence, they carry the water of poor mineralization into Baikal. The water has very high drinking qualities.

    The Baikal world is extremely diverse. Now Baikal is known to have 1550 species and varieties of animals and 1085 species of plant organisms. In the open part of the lake the fauna by 60% is endemic. All in all, 11 families and subfamilies, 96 genera, uniting about 1000 species are endemic to Baikal. Out of 52 species of baikalian fish 27 species are endemic.

    The most popular fish in Baikal is omul Coregonus autumnalis migratorius. Omul feeds upon zoop - lankton, bottom gammarids, larvae of insects and the young of fish. Omul spawns in the tributaries of Baikal in autumn. Maximum catches (the 40's) were 60-80 thousand tons. The omul population is subject to fluctuations due to intensive fishing and seasonal conditions of spawning.

    The crowning glory and mystery of nature, Baikal was not created for production needs but for us to drink its water, its priceless and most important wealth, marvel at its stately beauty and breathe its precious air. First and for most, we need it ourselves.

    You can find more complete description and photos of Baikal in websites: http://baikal.ru/old.baikal.ru/baikal/bae_new.htm
http://www.sbaikal.ru/eng/baikal/index.htm