E3S Web Conf.
Volume 98, 201916th International Symposium on Water-Rock Interaction (WRI-16) and 13th International Symposium on Applied Isotope Geochemistry (1st IAGC International Conference)
|Number of page(s)||5|
|Section||Applied Isotope Geochemistry|
|Published online||07 June 2019|
Strontium isotopic ratio in brines from the north-east of the Angara-Lenskiy artesian basin
Institute of the Earth’s Crust, Russian Academy of Sciences, Siberian Branch, 664033 Irkutsk, Russia
2 Irkutsk State University, 664003 Irkutsk, Russia
3 Isotope Tracer Technologies Inc, Waterloo, Ontario, N2V 1Z5, Canada
4 Department of Earth and Environmental Science, University of Waterloo, Waterloo, Ontario, N2L 3G1, Canada
5 School of Engineering, University of Guelph, Guelph, ON, N1G 2W2, Canada
* Corresponding author: firstname.lastname@example.org
The Sr isotopic composition was measured in a number of samples of highly concentrated oil-field brines from the Angara-Lenskiy artesian basin. The brines are contained in the salt-bearing and subsalt-bearing hydrogeological formations at a depth of 1,500-3,000 m. They have high salinity (385-530 g/L) and high Sr content (2.3-7.0 mg/L). The 87Sr/86Sr ratio ranges from 0.70800 to 0.713062. Most brine samples exhibit an isotopic composition similar to Vendian-Cambrian paleoocean water, however several samples from the Yaraktinskiy horizon are significantly more radiogenic than others. It suggests that a considerable amount of 87Sr is likely to have been carried from terrigenous sediments due to a water-rock interaction.
© The Authors, published by EDP Sciences, 2019
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