Abstract
The results of the examination of the chemical composition and Sr isotopic ratios in brines of Cl-Ca, Cl-Ca-Na, and Cl-Na types from the Tunguska basin with the total salinity within the range of 87-626 g/1 are discussed. The pH is 2.9 to 7.7, and the Sr isotope ratios are 0.70825 ± 5 to 0.72010 ± 11. It is shown that the examined brines strongly differ drastically in their composition from the marine brine formed at the stage of halite precipitation. Based on their composition in terms of a number of indicative indices, we differentiated the brines into infiltrational and sedimentational, with a wide range of mixing between sedimentational and infiltrational (fresh and saline) waters. The sedimentational brines are strongly altered, which is evident from their higher Ca, Sr, Br, and radiogenic 87Sr contents. Sr isotope composition shows that all the brines interact at a various extent with aluminosilicate minerals of the terrigenous or basement rocks, which has led to an enrichment of brines in radiogenic Sr by 2-100%. Two groups of brines have been discriminated by type of strontium alteration: (1) brines altered in sulfate-carbonate rocks with a low 87Sr content and (2) brines altered in aluminosilicate rocks with a high 87Sr content.
| Original language | English |
|---|---|
| Pages (from-to) | 1070-1083 |
| Number of pages | 14 |
| Journal | Geochemistry International |
| Volume | 38 |
| Issue number | 11 |
| Publication status | Published - Nov 2000 |
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ASJC Scopus subject areas
- Geochemistry and Petrology
- Geophysics
Cite this
The chemical composition and strontium isotopes of brines from the Tunguska basin : Implications for their formation. / Shvartsev, S. L.
In: Geochemistry International, Vol. 38, No. 11, 11.2000, p. 1070-1083.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - The chemical composition and strontium isotopes of brines from the Tunguska basin
T2 - Implications for their formation
AU - Shvartsev, S. L.
PY - 2000/11
Y1 - 2000/11
N2 - The results of the examination of the chemical composition and Sr isotopic ratios in brines of Cl-Ca, Cl-Ca-Na, and Cl-Na types from the Tunguska basin with the total salinity within the range of 87-626 g/1 are discussed. The pH is 2.9 to 7.7, and the Sr isotope ratios are 0.70825 ± 5 to 0.72010 ± 11. It is shown that the examined brines strongly differ drastically in their composition from the marine brine formed at the stage of halite precipitation. Based on their composition in terms of a number of indicative indices, we differentiated the brines into infiltrational and sedimentational, with a wide range of mixing between sedimentational and infiltrational (fresh and saline) waters. The sedimentational brines are strongly altered, which is evident from their higher Ca, Sr, Br, and radiogenic 87Sr contents. Sr isotope composition shows that all the brines interact at a various extent with aluminosilicate minerals of the terrigenous or basement rocks, which has led to an enrichment of brines in radiogenic Sr by 2-100%. Two groups of brines have been discriminated by type of strontium alteration: (1) brines altered in sulfate-carbonate rocks with a low 87Sr content and (2) brines altered in aluminosilicate rocks with a high 87Sr content.
AB - The results of the examination of the chemical composition and Sr isotopic ratios in brines of Cl-Ca, Cl-Ca-Na, and Cl-Na types from the Tunguska basin with the total salinity within the range of 87-626 g/1 are discussed. The pH is 2.9 to 7.7, and the Sr isotope ratios are 0.70825 ± 5 to 0.72010 ± 11. It is shown that the examined brines strongly differ drastically in their composition from the marine brine formed at the stage of halite precipitation. Based on their composition in terms of a number of indicative indices, we differentiated the brines into infiltrational and sedimentational, with a wide range of mixing between sedimentational and infiltrational (fresh and saline) waters. The sedimentational brines are strongly altered, which is evident from their higher Ca, Sr, Br, and radiogenic 87Sr contents. Sr isotope composition shows that all the brines interact at a various extent with aluminosilicate minerals of the terrigenous or basement rocks, which has led to an enrichment of brines in radiogenic Sr by 2-100%. Two groups of brines have been discriminated by type of strontium alteration: (1) brines altered in sulfate-carbonate rocks with a low 87Sr content and (2) brines altered in aluminosilicate rocks with a high 87Sr content.
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UR - http://www.scopus.com/inward/citedby.url?scp=0040520264&partnerID=8YFLogxK
M3 - Article
VL - 38
SP - 1070
EP - 1083
JO - Geochemistry International
JF - Geochemistry International
SN - 0016-7029
IS - 11
ER -