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Datasets of project "Department of Geology, Oregon State University"

Mostrando recursos 1 - 20 de 144

  1. Corg, CaCO3, bulk densities, accumulation rates and ages of ODP Leg 167 sites and three piston cores, California margin

    Lyle, Mitchell W; Mix, Alan C; Ravelo, Ana Christina; Andreasen, Dyke; Heusser, Linda E; Olivarez, Annette
    Sediments from five Leg 167 drill sites and three piston cores were analyzed for Corg and CaCO3. Oxygen isotope stratigraphy on benthic foraminifers was used to assign age models to these sedimentary records. We find that the northern and central California margin is characterized by k.y.-scale events that can be found in both the CaCO3 and Corg time series. We show that the CaCO3 events are caused by changes in CaCO3 production by plankton, not by dissolution. We also show that these CaCO3 events occur in marine isotope Stages (MIS) 2, 3, and 4 during Dansgaard/Oeschger interstadials. They occur most...

  2. Corg, CaCO3, bulk densities, accumulation rates and ages of ODP Leg 167 sites and three piston cores, California margin

    Lyle, Mitchell W; Mix, Alan C; Ravelo, Ana Christina; Andreasen, Dyke; Heusser, Linda E; Olivarez, Annette
    Sediments from five Leg 167 drill sites and three piston cores were analyzed for Corg and CaCO3. Oxygen isotope stratigraphy on benthic foraminifers was used to assign age models to these sedimentary records. We find that the northern and central California margin is characterized by k.y.-scale events that can be found in both the CaCO3 and Corg time series. We show that the CaCO3 events are caused by changes in CaCO3 production by plankton, not by dissolution. We also show that these CaCO3 events occur in marine isotope Stages (MIS) 2, 3, and 4 during Dansgaard/Oeschger interstadials. They occur most...

  3. Corg, CaCO3, bulk densities, accumulation rates and ages of ODP Leg 167 sites and three piston cores, California margin

    Lyle, Mitchell W; Mix, Alan C; Ravelo, Ana Christina; Andreasen, Dyke; Heusser, Linda E; Olivarez, Annette
    Sediments from five Leg 167 drill sites and three piston cores were analyzed for Corg and CaCO3. Oxygen isotope stratigraphy on benthic foraminifers was used to assign age models to these sedimentary records. We find that the northern and central California margin is characterized by k.y.-scale events that can be found in both the CaCO3 and Corg time series. We show that the CaCO3 events are caused by changes in CaCO3 production by plankton, not by dissolution. We also show that these CaCO3 events occur in marine isotope Stages (MIS) 2, 3, and 4 during Dansgaard/Oeschger interstadials. They occur most...

  4. (Table 11) d18O, carbon composition, bulk densities, accumulation rates and ages of core Y74-2-22

    Lyle, Mitchell W; Mix, Alan C; Ravelo, Ana Christina; Andreasen, Dyke; Heusser, Linda E; Olivarez, Annette

  5. (Table 11) d18O, carbon composition, bulk densities, accumulation rates and ages of core Y74-2-22

    Lyle, Mitchell W; Mix, Alan C; Ravelo, Ana Christina; Andreasen, Dyke; Heusser, Linda E; Olivarez, Annette

  6. (Table 6) d18O, carbon composition, bulk densities, accumulation rates and ages of core EW9504-17PC

    Lyle, Mitchell W; Mix, Alan C; Ravelo, Ana Christina; Andreasen, Dyke; Heusser, Linda E; Olivarez, Annette

  7. (Table 6) d18O, carbon composition, bulk densities, accumulation rates and ages of core EW9504-17PC

    Lyle, Mitchell W; Mix, Alan C; Ravelo, Ana Christina; Andreasen, Dyke; Heusser, Linda E; Olivarez, Annette

  8. (Table 5) Organic carbon and calcium carbonate composition and ages of core W8709A-13

    Lyle, Mitchell W; Mix, Alan C; Ravelo, Ana Christina; Andreasen, Dyke; Heusser, Linda E; Olivarez, Annette

  9. (Table 5) Organic carbon and calcium carbonate composition and ages of core W8709A-13

    Lyle, Mitchell W; Mix, Alan C; Ravelo, Ana Christina; Andreasen, Dyke; Heusser, Linda E; Olivarez, Annette

  10. Nutrients of pore water in sediments of the central equatorial Pacific

    Martin, William R; Bender, Michael L; Leinen, Margaret W; Orchardo, J
    Shipboard whole-core squeezing was used to measure pore water concentration vs depth profiles of [NO3]-, O2 and SiO2 at 12 stations in the equatorial Pacific along a transect from 15°S to 11°N at 135°W. The [NO3]- and SiO2 profiles were combined with fine-scale resistivity and porosity measurements to calculate benthic fluxes. After using O2 profiles, coupled with the [NO3]- profiles, to constrain the C:N of the degrading organic matter, the [NO3]- fluxes were converted to benthic organic carbon degradation rates. The range in benthic organic carbon degradation rates is 7-30 ?mol cm**-2 y**-1, with maximum values at the equator and...

  11. Nutrients of pore water in sediments of the central equatorial Pacific

    Martin, William R; Bender, Michael L; Leinen, Margaret W; Orchardo, J
    Shipboard whole-core squeezing was used to measure pore water concentration vs depth profiles of [NO3]-, O2 and SiO2 at 12 stations in the equatorial Pacific along a transect from 15°S to 11°N at 135°W. The [NO3]- and SiO2 profiles were combined with fine-scale resistivity and porosity measurements to calculate benthic fluxes. After using O2 profiles, coupled with the [NO3]- profiles, to constrain the C:N of the degrading organic matter, the [NO3]- fluxes were converted to benthic organic carbon degradation rates. The range in benthic organic carbon degradation rates is 7-30 ?mol cm**-2 y**-1, with maximum values at the equator and...

  12. Bulk geochemical and lipid biomarker data for sediment core W8402A-14

    Prahl, Frederick G; Muehlhausen, Laurel A; Lyle, Mitchell W
    Eleven sediment samples taken downcore and representing the past 26 kyr of deposition at MANOP site C (0°57.2°N, 138°57.3°W) were analyzed for lipid biomarker composition. Biomarkers of both terrestrial and marine sources of organic carbon were identified. In general, concentration profiles for these biomarkers and for total organic carbon (TOC) displayed three common stratigraphic features in the time series: (1) a maximum within the surface sediment mixed layer (<=4 ka); (2) a broad minimum extending throughout the interglacial deposit; and (3) a deep, pronounced maximum within the glacial deposit. Using the biomarker records, a simple binary mixing model is described...

  13. Bulk geochemical and lipid biomarker data for sediment core W8402A-14

    Prahl, Frederick G; Muehlhausen, Laurel A; Lyle, Mitchell W
    Eleven sediment samples taken downcore and representing the past 26 kyr of deposition at MANOP site C (0°57.2°N, 138°57.3°W) were analyzed for lipid biomarker composition. Biomarkers of both terrestrial and marine sources of organic carbon were identified. In general, concentration profiles for these biomarkers and for total organic carbon (TOC) displayed three common stratigraphic features in the time series: (1) a maximum within the surface sediment mixed layer (<=4 ka); (2) a broad minimum extending throughout the interglacial deposit; and (3) a deep, pronounced maximum within the glacial deposit. Using the biomarker records, a simple binary mixing model is described...

  14. Foraminiferal abundance, carbonat concentration and dissolution index of sediment core W9903B-51GC

    LaMontagne, R W; Murray, Richard W; Wei, Kuo-Yen; Leinen, Margaret W; Wang, Chung-Ho
    In order to investigate the paleoceanographic record of dissolution of calcium carbonate (CaCO3) in the central equatorial Pacific Ocean, we have studied the relationship between three indices of foraminiferal dissolution and the concentration and accumulation of CaCO3, opal, and Corg in Core WEC8803B-GC51 (1.3°N, 133.6°W; 4410 m). This core spans the past 413 kyr of deposition and moved in and out of the lysoclinal transition zone during glacial-interglacial cycles of CaCO3 production and dissolution. The record of dissolution intensity provided by foraminiferal fragmentation, the proportion of benthic foraminifera, and the foraminiferal dissolution index consistently indicates that the past corrosion of...

  15. Foraminiferal abundance, carbonat concentration and dissolution index of sediment core W9903B-51GC

    LaMontagne, R W; Murray, Richard W; Wei, Kuo-Yen; Leinen, Margaret W; Wang, Chung-Ho
    In order to investigate the paleoceanographic record of dissolution of calcium carbonate (CaCO3) in the central equatorial Pacific Ocean, we have studied the relationship between three indices of foraminiferal dissolution and the concentration and accumulation of CaCO3, opal, and Corg in Core WEC8803B-GC51 (1.3°N, 133.6°W; 4410 m). This core spans the past 413 kyr of deposition and moved in and out of the lysoclinal transition zone during glacial-interglacial cycles of CaCO3 production and dissolution. The record of dissolution intensity provided by foraminiferal fragmentation, the proportion of benthic foraminifera, and the foraminiferal dissolution index consistently indicates that the past corrosion of...

  16. Carbonate and Aluminium accumulation in the central equatorial Pacific Ocean

    Murray, Richard W; Leinen, Margaret W; Isern, Alexandra R
    We examined the flux of Al to sediment accumulating beneath the zone of elevated productivity in the central equatorial Pacific Ocean, along a surface sediment transect at 135°W as well as downcore for a 650 kyr record at 1.3°N, 133.6°W. Across the surface transect, a pronounced, broadly equatorially symmetric increase in Al accumulation is observed, relative to Ti, with Al/Ti ratios reaching values 3-4 times that of potential detrital sources. The profile parallels biogenic accumulation and the modeled flux of particulate 234Th, suggesting rapid and preferential adsorptive removal of Al from seawater by settling biogenic particles. Normative calculations confirm that...

  17. Carbonate and Aluminium accumulation in the central equatorial Pacific Ocean

    Murray, Richard W; Leinen, Margaret W; Isern, Alexandra R
    We examined the flux of Al to sediment accumulating beneath the zone of elevated productivity in the central equatorial Pacific Ocean, along a surface sediment transect at 135°W as well as downcore for a 650 kyr record at 1.3°N, 133.6°W. Across the surface transect, a pronounced, broadly equatorially symmetric increase in Al accumulation is observed, relative to Ti, with Al/Ti ratios reaching values 3-4 times that of potential detrital sources. The profile parallels biogenic accumulation and the modeled flux of particulate 234Th, suggesting rapid and preferential adsorptive removal of Al from seawater by settling biogenic particles. Normative calculations confirm that...

  18. Density and calcium carbonate in sediment core VNTR01-9PC

    Mayer, Larry A

  19. Density and calcium carbonate in sediment core VNTR01-9PC

    Mayer, Larry A

  20. Density and calcium carbonate in sediment core VNTR01-9PC

    Mayer, Larry A

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