Akademik Veri Yönetim Sistemi
BULLETIN OF THE MINERAL RESEARCH AND EXPLORATION, cilt.1, sa.1, ss.1, 2024 (ESCI)
In
2012, a comprehensive study of the Danube River’s submarine channels
continental slope was conducted, employing multi-beam bathymetry and over 2300
km of high-resolution two-dimensional seismic reflection data. The
investigation aimed to delve into the area's morphology, potential for gas
hydrate presence, and the correlation between stratigraphic units and gas hydrates.
Three distinct zones, revealed Bottom Simulating Reflectors (BSRs) indicating
the base of gas hydrate accumulations in the seismic data. These BSR areas
exhibited Type-1 reflections, characterized by continuous cuts across layers.
Notably, five discrete levels of BSRs were detected, suggesting a consistent
gas composition across them. The multiple BSR formations are attributed to
higher sedimentation rates relative to gas hydrate dissolution rates. Mass transport
deposits (MTDs) within the gas hydrate stability zone (6 in total) were
identified; their highly consolidated nature could account for the absence of
gas hydrates within them. Additionally, one MTD displayed elevated heat flow
measurements, indicating a higher geothermal gradient, likely due to its
relatively high thermal conductivity. This disparity in thermal properties
explains the deeper-than-expected BSR in this specific region, as it forms at a
lower temperature equilibrium level due to efficient heat conduction.
Keywords:
Danube Channel-Levee System, Multiple BSR, MTD, Geothermal Gradient.