Journal: Marine Geology

Abbreviation

Mar. Geol.

Publisher

Elsevier

Journal Volumes

ISSN

0025-3227

Description

Filters

Reset filters

Search Results

Publications1 - 10 of 23
  • Paleoseismic potential of sublacustrine landslide records in a high-seismicity setting (south-central Alaska)
    Item type: Journal Article
    Praet, Nore; Moernaut, Jasper; Daele, Maarten van; et al. (2017)
    Marine Geology
  • The influence of overpressure and focused fluid flow on subaquatic slope stability in a formerly glaciated basin: Lake Villarrica (South-Central Chile)
    Item type: Journal Article
    Moernaut, Jasper; Wiemer, Gauvain; Reusch, Anna; et al. (2017)
    Marine Geology
  • Noble gases in sediment pore water yield insights into hydrothermal fluid transport in the northern Guaymas Basin
    Item type: Journal Article
    Horstmann, Edith; Tomonaga, Yama; Brennwald, Matthias S.; et al. (2021)
    Marine Geology
    We present noble gas concentrations determined in pore water of deep-sea sediments close to a recently discovered hydrothermal vent site, consisting of a mound structure and several black smokers, located in the northern Guaymas Basin, Gulf of California. Noble gases were used as tracers to identify the origin of fluids within the sediment pore space and to gain insight into transport dynamics of hydrothermal fluids in this region. Our data suggest that Guaymas Basin bottom water is the only source of pore water in the pelagic sediment body close to the hydrothermal vent field. In particular, there is no evidence of any direct (diffusive or advective) transport of hydrothermal fluids through the deep-sea sediments surrounding the black smoker system. This finding implies that at this black smoker site hydrothermal fluids are transported upwards from the fluid source in very narrow pathways below the smokers. Thus, the fluids are only injected into the ocean directly through the chimneys of the black smokers and no additional emission from the surrounding sediment takes place. Helium isotope data show that during a more active phase of the vent field in the past (supposedly representing the early onset of the black smokers 5–6 kyrs ago), bottom water with a different isotopic signature was incorporated into the sediment column. © 2021 Elsevier
  • Investigating the history of East Asian monsoon and climate during the last glacial–interglacial period (0–140 000 years): mineralogy and geochemistry of ODP Sites 1143 and 1144, South China Sea
    Item type: Journal Article
    Tamburini, Federica; Adatte, Thierry; Föllmi, Karl; et al. (2003)
    Marine Geology
    Monsoon climate is an important component of the global climatic system. A comprehensive understanding of its variability over glacial–interglacial time scales as well as of its effects on the continent and in the ocean is required to decipher links between climate, continental weathering and productivity. A detailed multiproxy study, including bulk and clay mineralogy, grain-size analysis, phosphorus geochemistry (SEDEX extraction), organic matter characterization, and nitrogen stable isotopes, was carried out on samples from ODP Sites 1143 and 1144 (Leg 184, South China Sea), covering the past 140 000 years. We tentatively reconstruct the complex sedimentation and climatic history of the region during the last glacial–interglacial cycle, when sea-level variations, linked to the growth and melting of ice caps, interact with monsoon variability. During interglacial periods of high sea level, summer monsoon was strong, and humid and warm climate characterized the adjacent continent and islands. Clay minerals bear signals of chemical weathering during these intervals. High calcite and reactive phosphorus mass accumulation rates (MARs) indicate high productivity, especially in the southern region of the basin. During glacial intervals, strong winter monsoon provided enhanced detrital input from the continent, as indicated by high detrital MAR. Glacial low sea level resulted in erosion of sediments from the exposed Sunda shelf to the south, and clay mineral variations indicate that warm and humid conditions still prevailed in the southern tropical areas. Enhanced supply of nutrients from the continent, both by river and eolian input, maintained high primary productivity. Reduced circulation during these periods possibly induced active remobilization of nutrients, such as phosphorus, from the sediments. Intense and short cold periods recorded during glacial and interglacial stages correlate with loess records in China and marine climatic records in the North Atlantic, confirming a teleconnection between low- and high-latitude climate variability. © 2003 Elsevier B.V.
  • The source of Pleistocene carbonate below the CCD in the central basin of South China Sea: Evidences from coccolith and geochemistry
    Item type: Journal Article
    Zhang, Hongrui; Zhou, Xinquan; Jiang, Xiaoying; et al. (2023)
    Marine Geology
    Carbonate dissolution and deposition in the deep ocean is a critical component of carbon cycle, but detailed pictures of carbonate dynamics below the Carbonate Compensation Depth (CCD) remains poorly understood. In this study, we present a ∼ 420 thousand years record of carbonate content below CCD in IODP Site U1433 at 4.4 km water depth in the South China Sea (SCS). Instead of carbonate-free sediment, we observed that the carbonate content in this deep site could reach as high as 40%. The dissolution-resistant biogenic carbonate, coccoliths, and stable isotope ratio of bulk carbonate were analyzed to trace the carbonate sources. The coccolith assemblage in IODP Site U1433 shows an unrealistic feature of high productivity, which indicates a lateral transport of coccoliths from the northern SCS to the central basin. Coccoliths' contribution to total carbonate was on average 30% and could be as high as ∼80%. Their contribution to carbonate increased at the expense of the dissolution of other biogenic carbonate, such as foraminifera, and decreased with the dilution of other terrestrial carbonate particles. According to the thickness of coccoliths, significant dissolution of coccoliths only happened when the carbonate content dropped below 3%. Marbles from Taiwan, with negative oxygen isotope ratios, and early diagenetic carbonates from carbonate platform nearby, with both negative carbon and oxygen isotope ratios, could be the other important sources besides the marine biogenic carbonate. With help of numerical simulations, we estimated that the lateral transport by turbidity currents could contribute up to 70–90% of the deep-sea sediment in the central basin of SCS. These new findings enrich our knowledge of the carbon fluxes from continental margins to the deep ocean as a key part of the carbon cycle.
  • Effects of shear band propagation on early waves generated by initial breakoff of tsunamigenic landslides
    Item type: Journal Article
    Trapper, Pavel A.; Puzrin, Alexander M.; Germanovich, Leonid N. (2015)
    Marine Geology
  • Lacustrine turbidites produced by surficial slope sediment remobilization: A mechanism for continuous and sensitive turbidite paleoseismic records
    Item type: Journal Article
    Moernaut, Jasper; Van Daele, Maarten; Strasser, Michael; et al. (2017)
    Marine Geology
  • The 1996 AD delta collapse and large turbidite in Lake Brienz
    Item type: Journal Article
    Girardclos, Stéphanie; Schmidt, Oliver T.; Sturm, Mike; et al. (2007)
    Marine Geology
  • Quantifying subaqueous slope stability during seismic shaking
    Item type: Journal Article
    Strasser, Michael; Stegmann, Sylvia; Bussmann, Felix; et al. (2007)
    Marine Geology
  • Changes in distal sedimentation regime of the Rhone delta system controlled by subaquatic channels (Lake Geneva, Switzerland/France)
    Item type: Journal Article
    Kremer, Katrina; Corella, Juan P.; Hilbe, Michael; et al. (2015)
    Marine Geology
Publications1 - 10 of 23