NATURE CONCERTHALL | 2010 : Calcium carbonatum
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2010 : Calcium carbonatum

Travertine

Carbonate sedimentary rocks consists primarily of one of the carbonate minerals. Many of them are widely found in nature. This is particularly true of calcium carbonate (CaCO3), which is frequently found in thick layers that have formed from sediment collecting in seas.
Travertine, together with the loose freshwater carbonate rocks can be found in the upper layers of the earth, close to the surface. It has formed at the same time as the sediments of rivers and streams in the period after the ice age (Holocene) about 6 000 to 10 000 years ago, when the climate in Latvia was favourable for long-term sedimentation of calcium carbonate. Carbonate from the water settled on plants and thus one can frequently find moss encrusted within travertine – calcified reeds, tree branches and leaves. The mass of the fragile carbonate gradually started to harden, at the same time changing also in structure – thus calcifying into calcite crystals. Latvia is among the hundreds of places of freshwater carbonate deposits, but only in a few of them is travertine found.
Due to the decorative properties of travertine – its soft-grey colour and porous grain, as well as the fact that it is easily sculpted, it is popular to use as a decorative material for monuments and buildings. From all the Baltic countries, Latvia is the only one to have travertine in its soil.

varonis2010

26.06.2010
Venue: Rauna. At the bank of the river Rauna near the Rauna rock formations.

02.07.2010
Venue: Aizkraukle, in the valley of the Daugava near the “Cepļa” dolomite formations.

ENTRANCE WITH TWO FLAT PEBBLES.

STORIES & POETRY: Anita Saulīte, Pēters Brūveris, Eduards Švāns
PRODUCER:
Roberts Rubīns, Viktors Keino, Gatis Kidals, Oskars Timbars
MUSIC: Ingus Ulmanis, Gints Sola, Kaspars Tobis, Aigars Voitišķis, Anrijs Grinbergs, Roberts Rasa, Valdis and Rūta Muktupāvels, Džulians.

anita-saulite

ANITA SAULĪTE

Anita Saulīte is a geologist. Since 1971 she has been working at the Latvian Museum of Natural History – recently retired. Regularly publishes in scientific journals and reviews, popular magazines and newspapers.

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