Tim Freudenthal
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View article: The FUTURE of the US Marine Seafloor and Subseafloor Sampling Capabilities
The FUTURE of the US Marine Seafloor and Subseafloor Sampling Capabilities Open
Recent changes in US oceanographic assets are impacting scientists' ability to access seafloor and sub‐seafloor materials and thus constraining progress on science critical for societal needs. Here we identify national infrastructure needs…
View article: Installation of Borehole Observatories at Reykjanes Ridge with the sea floor drill rig MARUM-MeBo7
Installation of Borehole Observatories at Reykjanes Ridge with the sea floor drill rig MARUM-MeBo7 Open
Based on site-survey work during research expedition M183 (2022), the sea floor drill rig MARUM-MeBo70 was deployed in summer 2023 on the research vessel MARIA S. MERIAN (MSM119) in order to install observatories for the investigation of h…
View article: New Heat Flow Measurements Offshore Montserrat: Advective Heat Flow Detected via MeBo Borehole Temperature Logging
New Heat Flow Measurements Offshore Montserrat: Advective Heat Flow Detected via MeBo Borehole Temperature Logging Open
New heat flow measurements collected at the Lesser Antilles Arc using a Hybrid Lister‐Outrigger probe and a new logging‐while‐tripping MeBo70 drilling approach provide the first high‐resolution (meter‐to‐cm‐scale) temperature‐depth measure…
View article: Initial results of a pilot project for sub-seabed basalt storage of carbon dioxide on the Reykjanes Ridge
Initial results of a pilot project for sub-seabed basalt storage of carbon dioxide on the Reykjanes Ridge Open
To meet temperature goals that limit warming to well below 2 °C requires the removal of hundreds of billions of tonnes of CO2 from the atmosphere over the course of this century. Effective Carbon Dioxide Removal (CDR) methodologies will be…
View article: Ice sheet–free West Antarctica during peak early Oligocene glaciation
Ice sheet–free West Antarctica during peak early Oligocene glaciation Open
One of Earth’s most fundamental climate shifts, the greenhouse-icehouse transition 34 million years ago, initiated Antarctic ice sheet buildup, influencing global climate until today. However, the extent of the ice sheet during the Early O…
View article: Volcanic Flank Collapse, Secondary Sediment Failure and Flow‐Transition: Multi‐Stage Landslide Emplacement Offshore Montserrat, Lesser Antilles
Volcanic Flank Collapse, Secondary Sediment Failure and Flow‐Transition: Multi‐Stage Landslide Emplacement Offshore Montserrat, Lesser Antilles Open
Volcanic flank collapses, especially those in island settings, have generated some of the most voluminous mass transport deposits on Earth and can trigger devastating tsunamis. Reliable tsunami hazard assessments for flank collapse‐driven …
View article: Gas hydrate precipitation and microbial transformation affect the composition of gases migrating through sediments drilled off SW Taiwan
Gas hydrate precipitation and microbial transformation affect the composition of gases migrating through sediments drilled off SW Taiwan Open
Molecular and stable isotopic compositions of light (C1–C3) hydrocarbons in sediments provide information on their formation pathways and postgenetic alterations. In 2018, gas hydrate-bearing sediment cores and borehole logging data …
View article: Quantification of mixed hydrate and free gas concentrations by the joint integration of velocity and conductivity information
Quantification of mixed hydrate and free gas concentrations by the joint integration of velocity and conductivity information Open
Highlights
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\n • The developed joint inversion quantifies both free gas and hydrate concentration.
\n • The robust method uses sonic and conductivity logs as main input parameters.
\n • For the test site it reveals two hydrate accumulati…
View article: Geological controls on the distribution of gas hydrates in the shallow parts of the gas hydrate stability zone – constraints from seafloor drilling off Taiwan
Geological controls on the distribution of gas hydrates in the shallow parts of the gas hydrate stability zone – constraints from seafloor drilling off Taiwan Open
The presence of gas hydrates is well known in the marine realm southwest off Taiwan due to the widespread distribution of bottom simulating reflectors in seismic records. To learn more about gas hydrate systems and their dynamics at passiv…
View article: Volcanic Island Sector Collapse: Reconstruction of volcanic activity and implications for subsequent mass movements from marine records drilled with MeBo70 offshore Montserrat (Lesser Antilles)
Volcanic Island Sector Collapse: Reconstruction of volcanic activity and implications for subsequent mass movements from marine records drilled with MeBo70 offshore Montserrat (Lesser Antilles) Open
Volcanic island sector collapses produce some of the volumetrically largest mass movements on Earth. They may trigger devastating tsunamis that pose hazards to coastal communities and endanger seafloor installations. However, very little i…
View article: Flank collapse, sediment failure and flow-transition: the multi-stage deposition of a volcanic sector collapse offshore Montserrat, Lesser Antilles
Flank collapse, sediment failure and flow-transition: the multi-stage deposition of a volcanic sector collapse offshore Montserrat, Lesser Antilles Open
Volcanic sector collapses generated some of the most voluminous mass transport deposits on Earth and triggered devastating tsunamis with numerous casualties. The associated sector collapse deposits occur around many volcanic islands all ov…
View article: Estimation of regional heat flux based on borehole temperatures acquired during logging while tripping with the sea floor drill rig MARUM-MeBo2
Estimation of regional heat flux based on borehole temperatures acquired during logging while tripping with the sea floor drill rig MARUM-MeBo2 Open
Borehole temperature measurements can be easily conducted  at the end of a drilling operation during trip out of the drill string (logging while tripping) without the need for additional operational time. After the final drilling dept…
View article: Heat flux estimation from borehole temperatures acquired during logging while tripping: a case study with the sea floor drill rig MARUM-MeBo
Heat flux estimation from borehole temperatures acquired during logging while tripping: a case study with the sea floor drill rig MARUM-MeBo Open
During trip out of the drill string at the end of a drilling operation (logging while tripping) borehole temperatures can be measured without the need for additional operational time. A simple interpretation of the measured borehole temper…
View article: Borehole logging and temperature measurements with the MARUM-MeBo sea bed drilling technology: Recent developments and scientific applications
Borehole logging and temperature measurements with the MARUM-MeBo sea bed drilling technology: Recent developments and scientific applications Open
<p>The MARUM-MeBo sea bed drilling technology is developed since 2004 at the MARUM Center for Marine Environmental Sciences at the University of Bremen (Freudenthal and Wefer, 2013). Presently two drill rigs are in operation for dril…
View article: Thermal Characterization of Pockmarks Across Vestnesa and Svyatogor Ridges, Offshore Svalbard
Thermal Characterization of Pockmarks Across Vestnesa and Svyatogor Ridges, Offshore Svalbard Open
The Svalbard margin represents one of the northernmost gas hydrate provinces worldwide. Vestnesa Ridge (VR) and Svyatogor Ridge (SR) west of Svalbard are two prominent sediment drifts showing abundant pockmarks and sites of seismic chimney…
View article: A Hybrid Lister‐Outrigger Probe for Rapid Marine Geothermal Gradient Measurement
A Hybrid Lister‐Outrigger Probe for Rapid Marine Geothermal Gradient Measurement Open
We have successfully constructed and tested a new, portable, Hybrid Lister‐Outrigger (HyLO) probe designed to measure geothermal gradients in submarine environments. The lightweight, low‐cost probe is 1–3 m long and contains 4–12 semicondu…
View article: More than ten years of successful operation of the MARUM-MeBo sea bed drilling technology: Highlights of recent scientific drilling campaigns
More than ten years of successful operation of the MARUM-MeBo sea bed drilling technology: Highlights of recent scientific drilling campaigns Open
<p>Over the last two decades sea bed drilling technology has proven to provide a valuable complement to the services of classical drill ships. Especially for shallow drillings up to 200 mbsf and when working in remote areas difficult…
View article: Sedimentological, palynological, geochemical, palaeomagnetic, and geochronological investigations of cores 9R and 10R from MARUM-MeBo70 Site PS104_20-2
Sedimentological, palynological, geochemical, palaeomagnetic, and geochronological investigations of cores 9R and 10R from MARUM-MeBo70 Site PS104_20-2 Open
Here we present sedimentological, micropalaeontological, inorganic and organic geochemical, palaeomagnetic, geochronological as well as X-ray computed tomography (CT) data obtained from successional drill cores 9R and 10R at MARUM-MeBo70 S…