GlobSed: Updated Total Sediment Thickness in the World's Oceans

Straume, Eivind Olavson; Gaina, Carmen; Medvedev, Sergei; Hochmuth, Katharina; Gohl, Karsten; Whittaker, Joanne M.; Fattah, R. Abdul; Doornenbal, J.C.; Hopper, John R.

doi:10.1029/2018gc008115

Cited by 256 publications

(210 citation statements)

References 54 publications

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“…The IODP cores were drilled on the eastern side of the ridge in seafloor 3.7 Myr old, about 65 and 84 km away from the S11D station. The IODP cores found 200 m sediment thickness in a local sedimentary basin (Ruddiman and Janecek 1989), which is much thicker than most of the stations in the present study and other studies (Aguis et al 2018;Straume et al 2019). This is probably explained by the fact that sediment deposition is enhanced by gravity flows and mass wasting in local basins (Ruddiman and Janecek 1989).…”

Section: Stationsupporting

confidence: 48%

“…We compare our estimated sediment thicknesses as a function of age with the global sediment thickness model (Straume et al 2019) and an earlier published result (Agius et al 2018) (Fig. 5).…”

Section: Discussionmentioning

confidence: 93%

“…To check the conformity, we compare the present result with the global sediment thickness (Straume et al 2019) and earlier published result using P-to-s (Ps) conversions (Agius et al 2018). We checked whether present result overlaps the 95% confidence region of the Ps result using previously reported dt and 1σ error bars (Agius et al 2018), and the following equation to estimate sediment thickness:…”

Section: Data and Methodsologymentioning

confidence: 91%

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Sediment structure at the equatorial mid-atlantic ridge constrained by seafloor admittance using data from the PI-LAB experiment

et al. 2020

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Well-constrained marine sediment characteristics (sediment thickness and shear wave velocity) are important not only for the study of climate over geologic times scales but also for correcting and accounting for its presence in seismic data used to investigate deeper structures. We use data from the PI-LAB (Passive Imaging of the Lithosphere Asthenosphere Boundary) experiment, which consisted of 39 broadband ocean bottom seismometers deployed at the Equatorial Mid-Atlantic Ridge near the Chain fracture zone covering 0-80 Myr old seafloor. We compute admittance between the pressure to the vertical displacement at the seafloor at frequencies between 0.1 and 0.2 Hz for microseism-generated Rayleigh waves for 18 stations where data quality is good to determine the sediment thickness and shear wave velocity. We find a general trend of increasing sediment thickness with the seafloor ages, as expected with sediment thicknesses that range from 10-450 m and, shear wave velocities that range from 0.05-0.34 km/s. We find sediment thickness varies almost uniformly across both sides of the ridge, and it indicates that both sides experienced a similar sedimentation process. Our results are in good agreement with the global sediment model that is based on drilling cores and active source experiments, but thinner by up to 50 m at several stations on seafloor older than 25 My. Overlap of the 95% confidence regions between admittance and Ps estimates for thickness and shear velocity is found at 15 stations where we have both Ps and admittance estimates. It suggests that both methods yield accurate estimates for sediment thickness. In addition, our admittance result extends the lateral resolution of sediment characteristics to stations that were not previously resolved by Ps.

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Section: Stationsupporting

confidence: 48%

Section: Discussionmentioning

confidence: 93%

Section: Data and Methodsologymentioning

confidence: 91%

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Sediment structure at the equatorial mid-atlantic ridge constrained by seafloor admittance using data from the PI-LAB experiment

et al. 2020

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“…Previously published global and regional paleobathymetric models oversimplify (Baatsen et al, 2016) or entirely omit the sedimentary column (Brown et al, 2006; Hayes et al, 2009). Recent inventories of the present‐day sedimentary cover of the Southern Ocean reveal previous large underestimations of its sediment thickness (Lindeque, Gohl, Wobbe, et al, 2016; Straume et al, 2019; Whittaker, Goncharov, et al, 2013), which makes a reevaluation of the sedimentary patterns and dynamics of deposition necessary. Recent paleooceanographic models that include improved paleobathymetries (e.g., Baatsen et al, 2018; Huang et al, 2017) report a high sensitivity of ocean current development and overall intensity to the changes in the seafloor geometry.…”

Section: Introductionmentioning

confidence: 99%

The Evolving Paleobathymetry of the Circum‐Antarctic Southern Ocean Since 34 Ma: A Key to Understanding Past Cryosphere‐Ocean Developments

Hochmuth

Gohl

Leitchenkov

et al. 2020

Geochem Geophys Geosyst

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The Southern Ocean is a key player in the climate, ocean, and atmospheric system. As the only direct connection between all three major oceans since the opening of the Southern Ocean gateways, the development of the Southern Ocean and its relationship with the Antarctic cryosphere has influenced the climate of the entire planet. Although the depths of the ocean floor have been recognized as an important factor in climate and paleoclimate models, appropriate paleobathymetric models including a detailed analysis of the sediment cover are not available. Here we utilize more than 40 years of seismic reflection data acquisition along the margins of Antarctica and its conjugate margins, along with multiple drilling campaigns by the International Ocean Discovery Program (IODP) and its predecessor programs. We combine and update the seismic stratigraphy across the regions of the Southern Ocean and calculate ocean‐wide paleobathymetry grids via a backstripping method. We present a suite of high‐resolution paleobathymetric grids from the Eocene‐Oligocene Boundary to modern times. The grids reveal the development of the Southern Ocean from isolated basins to an interconnected ocean affected by the onset and vigor of an Antarctic Circumpolar Current, as well as the glacial sedimentation and erosion of the Antarctic continent. The ocean‐wide comparison through time exposes patterns of ice sheet development such as switching of glacial outlets and the change from wet‐based to dry‐based ice sheets. Ocean currents and bottom‐water production interact with the sedimentation along the continental shelf and slope and profit from the opening of the ocean gateways.

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“…2). The sediment thickness was obtained from the gridded data of sediment thickness of Straume et al (2019).…”

Section: Bathymetric and Gravity Datamentioning

confidence: 99%

Near-ridge-axis volcanism affected by hotspot: insights from effective elastic thickness and topography of the Ojin Rise Seamounts, east of Shatsky Rise in the northwest Pacific Ocean

Shimizu

Nakanishi

Sano

2020

Earth Planets Space

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We used recently collected bathymetric data and published gravity data to examine the effective elastic thickness of the lithosphere and the crustal thickness beneath the Ojin Rise Seamounts, located east of Shatsky Rise in the northwest Pacific Ocean. An admittance analysis of the bathymetric and gravity data indicates that the effective elastic thickness of the Pacific plate under the Ojin Rise Seamounts is 2.7 ± 0.1 km, implying that the seamounts were formed on or near the spreading ridge between the Pacific and Farallon plates. The mean crustal thickness beneath the seamounts estimated from the mantle Bouguer anomaly is 10.1 ± 1.7 km, which is thicker than the surrounding crust. The thick crust was probably formed by the interaction between the Pacific-Farallon ridge and a hotspot forming Shatsky Rise. Our results indicate that late-stage volcanism after the formation of the main edifices of Shatsky Rise spread widely beyond the eastern side of the rise, forming the Ojin Rise Seamounts.

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GlobSed: Updated Total Sediment Thickness in the World's Oceans

Cited by 256 publications

References 54 publications

Sediment structure at the equatorial mid-atlantic ridge constrained by seafloor admittance using data from the PI-LAB experiment

Sediment structure at the equatorial mid-atlantic ridge constrained by seafloor admittance using data from the PI-LAB experiment

The Evolving Paleobathymetry of the Circum‐Antarctic Southern Ocean Since 34 Ma: A Key to Understanding Past Cryosphere‐Ocean Developments

Near-ridge-axis volcanism affected by hotspot: insights from effective elastic thickness and topography of the Ojin Rise Seamounts, east of Shatsky Rise in the northwest Pacific Ocean

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