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Thermal springs in Lake Baikal

Geology

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Abstract

The ??18O values of pore wqters range from -15.2??? to -16.7???, and ??D values range from -119??? to -126??? (both isotopes determined relative to standard mean ocean water [SMOW]). Bottom water in Lake Baikal has a ??18O value of -5.6??? and a ??D value of -120???. Pore waters in the vent area are significantly enriched in Mg, K, Ca, and especially Na and have the lowest ??D and ??18O values; these pore waters are isotopically and chemically distinct from pore waters in other, more typical parts of the lake. The pore-water isotopic data fall on a local meteoric water line, and covariations in water isotopes and chemistry are not consistent with evaporation or hydrothermal water-rock interaction. The thermal springs represent discharging meteoric waters that have been gently heated during subsurface circulation and are largely unaltered isotopically. Chemical variations are most likely due to dissolution of subsurface evaporites. -from Authors

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Thermal springs in Lake Baikal
Series title:
Geology
Volume
20
Issue:
6
Year Published:
1992
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
495
Last page:
497
Number of Pages:
3