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  • 1
    Publication Date: 2023-03-14
    Description: Table 1 shows biogeochemical data collected from five depths in the CSW1.1 well at the Coast Range Ophiolite Microbial Observatory, California, USA during a one-day sampling event in June 2016. Included are latitude and longitude of the CSW1.1 well, depth each sample was collected, oxygen level and other water quality parameters such as pH, temperature, and oxidation reduction potential. Hydrogen sulfide was measured via spectrophotometric methods, and anions were measured using ion chromatography. Dissolved gases were measured using a gas chromatograph with a flame ionization detector. Data was collected to understand the fluid chemistry in this well that is quite extreme relative to typical waters at Earth's surface and used to inform both Gibbs energy calculations and microbiological analyses.
    Keywords: alkaliphiles; biogeochemical gradients; Bromide; California, USA; Carbon, inorganic, dissolved; Carbon monoxide; Chloride; CO2 sequestration; Conductivity, electrical; CROMO_CSW1.1; CSW1.1; Depth, well; depth profile; Gas chromatography - Flame Ionization Detection (GC-FID); gas flux; groundwater; Hydrogen; hydrogenotrophy; Hydrogen sulfide; Ion chromatography; Methane; Nitrate; Nitrite; Oxidation reduction (RedOx) potential; Oxygen; pH; Saturation; Serpentinization; Spectrophotometric; Sulfate; Temperature, water; Water sample; WS
    Type: Dataset
    Format: text/tab-separated-values, 85 data points
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  • 2
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    PANGAEA
    In:  Supplement to: Hoehler, Tori M; Borowski, Walter S; Alperin, Marc J; Rodriguez, Nancy M; Paull, Charles K (2000): Model, stable isotope, and radiotracer characterization of anaerobic methane oxidation in gas hydrate-bearing sediments of the Blake Ridge. In: Paull, CK; Matsumoto, R; Wallace, PJ; Dillon, WP (eds.) Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 164, 1-7, https://doi.org/10.2973/odp.proc.sr.164.242.2000
    Publication Date: 2024-01-09
    Description: Anaerobic methane oxidation (AMO) was characterized in sediment cores from the Blake Ridge collected during Ocean Drilling Program (ODP) Leg 164. Three independent lines of evidence support the occurrence and scale of AMO at Sites 994 and 995. First, concentration depth profiles of methane from Hole 995B exhibit a region of upward concavity suggestive of methane consumption. Diagenetic modeling of the concentration profile indicates a 1.85-m-thick zone of AMO centered at 21.22 mbsf, with a peak rate of 12.4 nM/d. Second, subsurface maxima in tracer-based sulfate reduction rates from Holes 994B and 995B were observed at depths that coincide with the model-predicted AMO zone. The subsurface zone of sulfate reduction was 2 m thick and had a depth integrated rate that compared favorably to that of AMO (1.3 vs. 1.1 nmol/cm**2/d, respectively). These features suggest close coupling of AMO and sulfate reduction in the Blake Ridge sediments. Third, measured d13CH4 values are lightest at the point of peak model-predicted methane oxidation and become increasingly 13C-enriched with decreasing sediment depth, consistent with kinetic isotope fractionation during bacterially mediated methane oxidation. The isotopic data predict a somewhat (60 cm) shallower maximum depth of methane oxidation than do the model and sulfate reduction data.
    Keywords: Ocean Drilling Program; ODP
    Type: Dataset
    Format: application/zip, 2 datasets
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  • 3
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    PANGAEA
    In:  Supplement to: Borowski, Walter S; Hoehler, Tori M; Alperin, Marc J; Rodriguez, Nancy M; Paull, Charles K (2000): Significance of anaerobic methane oxidation in methane-rich sediments overlying the Blake Ridge gas hydrates. In: Paull, CK; Matsumoto, R; Wallace, PJ; Dillon, WP (eds.) Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 164, 1-13, https://doi.org/10.2973/odp.proc.sr.164.214.2000
    Publication Date: 2024-01-09
    Description: A unique set of geochemical pore-water data, characterizing the sulfate reduction and uppermost methanogenic zones, has been collected at the Blake Ridge (offshore southeastern North America) from Ocean Drilling Program (ODP) Leg 164 cores and piston cores. The d13C values of dissolved CO2 (sum CO2) are as 13C-depleted as -37.7 per mil PDB (Site 995) at the sulfate-methane interface, reflecting a substantial contribution of isotopically light carbon from methane. Although the geochemical system is complex and difficult to fully quantify, we use two methods to constrain and illustrate the intensity of anaerobic methane oxidation in Blake Ridge sediments. An estimate using a two-component mixing model suggests that ~24% of the carbon residing in the sum CO2 pool is derived from biogenic methane. Independent diagenetic modeling of a methane concentration profile (Site 995) indicates that peak methane oxidation rates approach 0.005 µmol/cm**3/yr, and that anaerobic methane oxidation is responsible for consuming ~35% of the total sulfate flux into the sediments. Thus, anaerobic methane oxidation is a significant biogeochemical sink for sulfate, and must affect interstitial sulfate concentrations and sulfate gradients. Such high proportions of sulfate depletion because of anaerobic methane oxidation are largely undocumented in continental rise sediments with overlying oxic bottom waters. We infer that the additional amount of sulfate depleted through anaerobic methane oxidation, fueled by methane flux from below, causes steeper sulfate gradients above methane-rich sediments. Similar pore water chemistries should occur at other methane-rich, continental-rise settings associated with gas hydrates.
    Keywords: Ocean Drilling Program; ODP
    Type: Dataset
    Format: application/zip, 2 datasets
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  • 4
    Publication Date: 2024-01-09
    Keywords: 164-995B; Calculated; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Isotope ratio mass spectrometry; Joides Resolution; Leg164; Methane, porewater; Ocean Drilling Program; ODP; Sample code/label; South Atlantic Ocean; δ13C, methane
    Type: Dataset
    Format: text/tab-separated-values, 78 data points
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  • 5
    Publication Date: 2024-01-09
    Keywords: 164-994B; 164-995B; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Event label; Joides Resolution; Leg164; Ocean Drilling Program; ODP; Sample code/label; South Atlantic Ocean; Sulfate reduction rate
    Type: Dataset
    Format: text/tab-separated-values, 128 data points
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  • 6
    Publication Date: 2024-01-09
    Keywords: 164-994A; 164-994C; 164-995A; 164-995B; 164-997A; Car_rise11-8PC; Carbon dioxide, dissolved; Carbon dioxide, standard deviation; DEPTH, sediment/rock; DRILL; Drilling/drill rig; Event label; Joides Resolution; Latitude of event; Leg164; Longitude of event; Nicaraguan Rise, North Atlantic Ocean; Ocean Drilling Program; ODP; PC; Piston corer; Sample code/label; South Atlantic Ocean; δ13C, carbon dioxide, aquatic; δ13C, standard deviation; δ34S, sulfate
    Type: Dataset
    Format: text/tab-separated-values, 268 data points
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  • 7
    Publication Date: 2024-01-09
    Keywords: 164-994A; Car_rise11-8PC; DEPTH, sediment/rock; DRILL; Drilling/drill rig; Event label; Joides Resolution; Leg164; Methane; Ocean Drilling Program; ODP; PC; Piston corer; Sample code/label; South Atlantic Ocean
    Type: Dataset
    Format: text/tab-separated-values, 106 data points
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  • 8
    Publication Date: 2024-04-20
    Description: We have measured microbial sulfate reduction rates by ultra sensitive radio tracer incubations in fluids from 11 wells of the actively serpentinizing the Coast Range ophiolite (CA, USA) and Samail ophiolite (Oman). We also determined environmental parameter of the serpentinizing fluids (pH, redox potential and chloride, sulfate, hydrogen, methane and organic acid conentrations. We also determiend the abundance of sulfate reducing taxa in the these fluids.
    Keywords: Binary Object; California_Coast_Ranges; California, USA; Coast_Range_Ophiolite; File content; Oman; ophiolites; radio-tracer; Semail_Oman; Semail_Ophiolite; Serpentinization; Sulfate reducing bacteria abundance; sulfate reduction rates
    Type: Dataset
    Format: text/tab-separated-values, 12 data points
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 42 (1986), S. 201-203 
    ISSN: 1420-9071
    Keywords: 1-Menthol ; iso-menthol ; neo-menthol ; 1,4-cineole ; 1,8-cineole ; m-chloroperbenzoic acid ; hydroxylation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Reaction of menthols and cineoles withm-chloroperbenzoic acid afforded tertiary, secondary, and primary alcohols, some of which were natural products having potent plant growth regulatory activity or were mammlianm metabolies.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    [s.l.] : Macmillian Magazines Ltd.
    Nature 412 (2001), S. 324-327 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The advent of oxygenic photosynthesis on Earth may have increased global biological productivity by a factor of 100–1,000 (ref. 1), profoundly affecting both geochemical and biological evolution. Much of this new productivity probably occurred in microbial mats, which ...
    Type of Medium: Electronic Resource
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