Gas composition and aqueous solutions of cold seep fluids of Laspi Bay (Southern coast of Crimea)

by

V.I. Lysenko1, 2, N.V. Chic3, E.N. Poludetkina4, A.S. Gulin5

1 Institute of Natural and Technical Systems, RF, Sevastopol, Lenin St., 28

 2 Branch of the Federal State Budgetary Educational Institution of Higher Education “Moscow State

  University named after M.V. Lomonosov” in Sevastopol, RF, Sevastopol, Heroes of Sevastopol St., 7

3 GBOU DO “Sevastopol Center for Tourism, Local History, Sports and Excursions”

  RF, Sevastopol, Papanin St., 5A

4 Moscow State University named after M.V. Lomonosov, RF, Moscow, Leninsky Gory, 1A

5 Federal State Budgetary Institution of Science, Federal Research Center “A.O. Kovalevsky Institute of

  Biology of the Southern Seas of the Russian Academy of Sciences”, RF, Sevastopol, Nakhimov Av., 2

DOI: 10.33075/2220-5861-2024-4-94-107

UDC 551.351.553(477.75)

EDN: https://elibrary.ru/rolnlr

Abstract:

A study of fluids and aqueous solutions of seeps of the underwater coastal slope of Laspi Bay was carried out. The volumes of gas emissions were studied. A hydrochemical survey of Laspi Bay was performed. The composition of gases was determined on a chromatograph “Chromatec-Crystal 5000” with PID and DTP. The material of aqueous solutions of fluids and seawater was analyzed by the method of mass spectrometry with inductively coupled plasma. It was established that the fluid supply occurs in a pulsed mode and is uneven. The composition of gases is not constant and is represented by CH4, C2H8, C2H6, C3H8, C3H6, C4H10, iC4H10, nC5H12, iC5H12, N2, O2, CO2, He, H2S, COS and CS2. For the first time, the presence of desalinated water solutions in the fluids of the Black Sea seeps was established. They are characterized, in contrast to seawater, by an increased content of Br, B, Sr, Si, Li, Mn, Se, As, Hg, Be, Ti, Ga, Ge, As, Zr, Ba, Bi, Th and U. The seep fluids of Laspi Bay have a deep thermogenic genesis with the replenishment of matter from the subsoil. In terms of gas composition, they differ somewhat from the emissions of gases from the cold seeps of the Black Sea and mud volcanoes. The volumes of emissions and the composition of fluids are controlled by the neotectonic uplift of the Crimean Mountains. The influx of gases and aqueous solutions of seep fluids participate in the evolutionary change in the composition of the atmosphere and hydrosphere.

Keywords: fluid, seeps, methane, nitrogen, helium, carbonyl sulfide, carbon disulfide, aqueous, solutions, geochemistry, bacterial structures.

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