22,830 Works

Abundances and d13C values of n-alkanes extracted from sediment samples of ODP Hole 116-717C, supplement to: Freeman, Katherine H; Colarusso, L A (2001): Molecular and isotopic records of C4 grassland expansion in the late Miocene. Geochimica et Cosmochimica Acta, 65(9), 1439-1454

Katherine H Freeman & L A Colarusso
Siwalik paleosol and Bengal Fan sediment samples were analyzed for the abundance and isotopic composition of n-alkanes in order to test for molecular evidence of the expansion of C4 grasslands on the Indian subcontinent. The carbon isotopic compositions of high-molecular-weight alkanes in both the ancient soils and sediments record a shift from low d13C values (ca. -30 per mil) to higher values (ca. -22 per mil) prior to 6 Ma. This shift is similar in...

(Table 7) d13C values of n-alkanes extracted from sediment samples of ODP Hole 116-717C

Katherine H Freeman & L A Colarusso

(Table 6) Abundances of n-alkanes extracted from sediment samples of ODP Hole 116-717C

Katherine H Freeman & L A Colarusso

Sulphate concentrations and sulphur isotopic composition in pore fluids from ODP Leg 168 sites, supplement to: Rudnicki, Mark D; Elderfield, Henry; Spiro, Baruch (2001): Fractionation of sulfur isotopes during bacterial sulfate reduction in deep ocean sediments at elevated temperatures. Geochimica et Cosmochimica Acta, 65(5), 777-789

Mark D Rudnicki, Henry Elderfield & Baruch Spiro
A numerical model of sulfate reduction and isotopic fractionation has been applied to pore fluid SO4**2- and d34S data from four sites drilled during Ocean Drilling Program (ODP) Leg 168 in the Cascadia Basin at 48°N, where basement temperatures reach up to 62°C. There is a source of sulfate both at the top and the bottom of the sediment column due to the presence of basement fluid flow, which promotes bacterial sulfate reduction below the...

(Table 2) Sulphate concentrations and sulphur isotopic composition in pore fluids from ODP Site 168-1025

Mark D Rudnicki, Henry Elderfield & Baruch Spiro

(Table 2) Sulphate concentrations and sulphur isotopic composition in pore fluids from ODP Hole 168-1028A

Mark D Rudnicki, Henry Elderfield & Baruch Spiro

(Table 2) Sulphate concentrations and sulphur isotopic composition in pore fluids from ODP Hole 168-1026C

Mark D Rudnicki, Henry Elderfield & Baruch Spiro

(Table 2) Sulphate concentrations and sulphur isotopic composition in pore fluids from ODP Hole 168-1026A

Mark D Rudnicki, Henry Elderfield & Baruch Spiro

(Table 2) Sulphate concentrations and sulphur isotopic composition in pore fluids from ODP Hole 168-1023A

Mark D Rudnicki, Henry Elderfield & Baruch Spiro

Age determinations and stable isotope records of four sediment profiles off Nova Scotia, supplement to: Keigwin, Lloyd D; Jones, Glenn A (1995): The marine record of deglaciation from the continental margin off Nova Scotia. Paleoceanography, 10(6), 973-986

Lloyd D Keigwin & Glenn A Jones
Continental margin sediments off Nova Scotia accumulate at high rates (up to 360 cm/kyr) and contain a history of millennial-scale environmental changes which are dominated by the proximity of the Laurentide ice sheet during the latest Quaternary. Using stable isotope ratios of oxygen, accelerator mass spectrometer radiocarbon dating, micropaleontology, and sedimentology, we document these changes in six piston cores ranging in water depth from ab. 450 to ab. 4300 m. We find that maximum d18O...

Chemical composition of sediment samples from ODP Leg 164 sites, Blake Ridge, supplement to: Dickens, Gerald Roy (2001): Sulfate profiles and barium fronts in sediment on the Blake Ridge: Present and past methane fluxes through a large gas hydrate reservoir. Geochimica et Cosmochimica Acta, 65(4), 529-543

Gerald Roy Dickens
Ocean Drilling Program (ODP) Sites 994, 995, and 997 were drilled into a large gas hydrate deposit on the crest of the Blake Ridge (southeast U.S. margin) where upward CH4 fluxes (F_OUT) are related to depths of pore water SO4**2- depletion. High-resolution pore water SO4**2- and sediment Ba profiles have been constructed at these sites to assess present and past F_out. Pore water SO4**2- profiles are linear with zero SO4**2- concentration occurring at 21.4, 21.6,...

(Appendix A) Chemical composition of sediment samples from ODP Hole 164-997A

Gerald Roy Dickens

(Appendix A) Chemical composition of sediment samples from ODP Hole 164-995A

Gerald Roy Dickens

(Appendix A) Chemical composition of sediment samples from ODP Hole 164-994C

Gerald Roy Dickens

(Appendix A) Chemical composition of sediment samples from ODP Hole 164-994A

Gerald Roy Dickens

Chemical composition of glass inclusions from ODP Holes 157-953C and 157-956B, supplement to: Gurenko, Andrey A; Schmincke, Hans-Ulrich (2000): S concentrations and its speciation in Miocene basaltic magmas north and south of Gran Canaria (Canary Islands): Constraints from glass inclusions in olivine and clinopyroxene. Geochimica et Cosmochimica Acta, 64(13), 2321-2337

Andrey A Gurenko & Hans-Ulrich Schmincke
We report S concentrations and relative proportions of (SO4)2- and S2- in OL- and CPX-hosted glass inclusions and in host glassy lapilli from Miocene basaltic hyaloclastites drilled north and south of Gran Canaria during ODP Leg 157. Compositions of glass inclusions and lapilli resemble those of subaerial Miocene shield basalts on Gran Canaria and comprise mafic to more evolved tholeiitic to alkali basalt and basanite (10.3-3.7 wt.% MgO, 44.5-56.9 wt.% SiO2). Glass inclusions fall into...

(Table 3) Redox conditions calculated from compositions of coexisting spinel and glass inclusions from ODP Hole 157-956B

Andrey A Gurenko & Hans-Ulrich Schmincke

(Table 3) Redox conditions calculated from compositions of coexisting spinel and glass inclusions from ODP Hole 157-953C

Andrey A Gurenko & Hans-Ulrich Schmincke

Chemical and isotopic compositions of pore fluids from ODP Sites 169-1034 and 169-1037, supplement to: James, Rachael H; Palmer, Martin R (2000): Marine geochemical cycles of the alkali elements and boron: The role of sediments. Geochimica et Cosmochimica Acta, 64(18), 3111-3122

Rachael H James & Martin R Palmer
We have analysed the concentrations of Li, K, Rb, Cs, and B, and the isotopic ratios of Li and B of a suite of pore fluids recovered from ODP Sites 1037 (Leg 169; Escanaba Trough) and 1034 (Leg 169S; Saanich Inlet). In addition, we have analysed dissolved K, Rb, and Cs concentrations for estuarine mixing of the Ganges-Brahmaputra river system. Together, these data sets have been used to assess the role of sediments in the...

(Table 1) Chemical and isotopic compositions of pore fluids from ODP Site 169-1037

Rachael H James & Martin R Palmer
d6Li = {[(6Li/7Li)sample / (6Li/7Li)standard] - 1} x 1000, where 6Li/7Li ratio of the standard (L-SVEC Li2CO3) is 0.082757 +/- 0.000028. Repeat analyses of samples give external 2 sigma precisions ~1?. d11B = {[(11B/10B)sample / (11B/10B)standard] - 1} x 1000, where 11B/10B ratio of the standard (NBS SRM 951) is 4.0527. The typical 2 sigma external precision of the d11B values is +/-0.4?.

(Table 1) Chemical and isotopic compositions of pore fluids from ODP Site 169-1034

Rachael H James & Martin R Palmer
d6Li = {[(6Li/7Li)sample / (6Li/7Li)standard] - 1} x 1000, where 6Li/7Li ratio of the standard (L-SVEC Li2CO3) is 0.082757 +/- 0.000028. Repeat analyses of samples give external 2 sigma precisions ~1‰.

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