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  • 1
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    Multiple proxies for sediment cores HLY0503-03JPC and P1-93AR-P23 collected from the Northwind Ridge, western Arctic Ocean (2018)
    PANGAEA
    In:  Supplement to: Dipre, Geoffrey R; Polyak, Leonid; Kuznetsov, Anton B; Oti, Emma A; Ortiz, Joseph D; Brachfeld, Stefanie A; Xuan, Chuang; Lazar, Kelly B; Cook, Ann E (2018): Plio-Pleistocene sedimentary record from the Northwind Ridge: new insights into paleoclimatic evolution of the western Arctic Ocean for the last 5 Ma. arktos - The Journal of Arctic Geosciences, 4(1), https://doi.org/10.1007/s41063-018-0054-y
    Details
    Publication Date: 2023-01-13
    Description: Sediment core HLY0503-03JPC from the top of the Northwind Ridge provides the first confirmed Plio-Pleistocene record from the western Arctic Ocean, with calcareous microfossils uniquely preserved to ca. 5 Ma. Results are compared to nearby core P1-93AR-P23 from the ridge slope, which was previously used to reconstruct early Quaternary sea-ice conditions in the region [1], and is now re-dated to at least the late Pliocene. Ages were estimated primarily from strontium isotope stratigraphy (SIS) on benthic foraminifers. Based on multiple physical, paleomagnetic, elemental geochemical, and paleobiological (foraminifers) proxies, we identify three major stratigraphic divisions (Units 1, 2a and 2b) roughly representing upper to middle ("glacial") Quaternary, lower Quaternary to Pliocene, and lower Pliocene to possibly upper Miocene (undated). Benthic foraminiferal assemblages were utilized to evaluate paleo-sea ice conditions, while other proxies were used to interpret paleo-circulation and sediment transport processes. Early Quaternary and older sediments indicate diminutive effect from glaciations, reduced sea-ice conditions, and a periodic strong current impact on the ridge top, possibly due to an enhanced Atlantic water flow. Ages derived from the first foraminiferal tests appearing at ca. 5 Ma likely indicate a redeposition pulse that we attribute to the onset of Pacific water throughflow via the Bering Strait. A large hiatus above this level in JPC3 spans most of the Pliocene. The Unit 2a/1 boundary, estimated to ca. 0.8 Ma, is marked by an abrupt faunal and sedimentary change, which is consistent with the major climatic shift that occurred during this time (Mid-Pleistocene Transition). Unit 1 exhibits a strong control from glacial cyclicity, with a progressive expansion of the Laurentide Ice Sheet primarily affecting the study region, and mostly perennial sea-ice conditions. Overall results suggest that the Pliocene and early Pleistocene may provide relevant paleoclimatic analogs for the rapidly changing Arctic environments of today.
    Type: Dataset
    Format: application/zip, 2 datasets
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  • 2
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    Mg/Ca ratios and SST reconstruction for sediment core MV99_GC41 (2019)
    PANGAEA
    Details
    Publication Date: 2023-02-12
    Keywords: AGE; DEPTH, sediment/rock; Event label; GC; Globigerina bulloides, Magnesium/Calcium ratio; Gravity corer; Inductively coupled plasma - mass spectrometry (ICP-MS); MV99_GC41; MV99_PC14; North Pacific; Sea surface temperature, annual mean; SST from Mg/Ca ratios
    Type: Dataset
    Format: text/tab-separated-values, 866 data points
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  • 3
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    Multiple proxies for sediment core P1-93AR-P23 collected from the Northwind Ridge, western Arctic Ocean (2018)
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Keywords: Anhysteretic susceptibility/volume susceptibility; Calcium; Counting 〉150 µm fraction; Counting 〉63 µm fraction; Cryogenic magnetometer, 2G Enterprises; DEPTH, sediment/rock; Foraminifera, benthic; Foraminifera, benthic, other; Foraminifera, benthic, polar group; Foraminifera, benthic extinction group; Foraminifera, benthic phytodetritus; Grain size, Mastersizer, Malvern Instrument Inc.; Grain size, sieving; Manganese; Mode, grain size; Northwind Ridge, Arctic Ocean; NRM, Inclination; P1-93AR-P23; PC; Piston corer; Size fraction 〉 0.063 mm, sand; Size fraction 〉 0.500 mm; X-ray computed tomography (CT); X-ray fluorescence ITRAX core scanner
    Type: Dataset
    Format: text/tab-separated-values, 4261 data points
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  • 4
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    (Table 2) Radiocarbon ages of selected southern Baja California sediment cores
    PANGAEA
    In:  Supplement to: van Geen, Alexander; Zheng, Y; Bernhard, Joan M; Cannariato, Kevin G; Carriquiry, José D; Dean, Walter E; Eakins, B W; Ortiz, Joseph D; Pike, Jennifer (2003): On the preservation of laminated sediments along the western margin of North America. Paleoceanography, 18(4), 1098, https://doi.org/10.1029/2003PA000911
    Details
    Publication Date: 2023-05-12
    Description: Piston, gravity, and multicores as well as hydrographic data were collected along the Pacific margin of Baja California to reconstruct past variations in the intensity of the oxygen-minimum zone (OMZ). Gravity cores collected from within the OMZ north of 24°N did not contain laminated surface sediments even though bottom water oxygen (BWO) concentrations were close to 5 µmol/kg. However, many of the cores collected south of 24°N did contain millimeter- to centimeter-scale, brown to black laminations in Holocene and older sediments but not in sediments deposited during the Last Glacial Maximum. In addition to the dark laminations, Holocene sediments in Soledad Basin, silled at 290 m, also contain white coccolith laminae that probably represent individual blooms. Two open margin cores from 430 and 700 m depth that were selected for detailed radiocarbon dating show distinct transitions from bioturbated glacial sediment to laminated Holocene sediment occurring at 12.9 and 11.5 ka, respectively. The transition is delayed and more gradual (11.3-10.0 ka) in another dated core from Soledad Basin. The observations indicate that bottom-water oxygen concentrations dropped below a threshold for the preservation of laminations at different times or that a synchronous hydrographic change left an asynchronous sedimentary imprint due to local factors. With the caveat that laminated sections should therefore not be correlated without independent age control, the pattern of older sequences of laminations along the North American western margin reported by this and previous studies suggests that multiple patterns of regional productivity and ventilation prevailed over the past 60 kyr.
    Keywords: Age, 14C AMS; Age, 14C calibrated; Age, comment; Age, dated; Age, dated standard error; Calendar age; Calendar age, standard error; Depth, relative; DEPTH, sediment/rock; Elevation of event; Event label; GC; Gravity corer; Latitude of event; Longitude of event; Melville; MUC; MultiCorer; North Pacific/Gulf of California; OXMZ01MV; OXMZ01MV-GC31; OXMZ01MV-GC32; OXMZ01MV-GC38; OXMZ01MV-GC41; OXMZ01MV-MC17; OXMZ01MV-MC19; OXMZ01MV-PC08; OXMZ01MV-PC09; OXMZ01MV-PC10; OXMZ01MV-PC14; PC; Piston corer; Reservoir age; Reservoir age, standard error; Sample code/label
    Type: Dataset
    Format: text/tab-separated-values, 438 data points
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  • 5
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    (Table 1) Age determination of sediment core HLY0503-08JPC
    PANGAEA
    In:  Supplement to: Adler, Ruth E; Polyak, Leonid; Ortiz, Joseph D; Kaufman, Darrell S; Channell, James E T; Xuan, Chuang; Grottoli, Andréa G; Sellén, Emma; Crawford, Kevin Richard (2009): Sediment record from the western Arctic Ocean with an improved Late Quaternary age resolution: HOTRAX core HLY0503-8JPC, Mendeleev Ridge. Global and Planetary Change, 68(1-2), 18-29, https://doi.org/10.1016/j.gloplacha.2009.03.026
    Details
    Publication Date: 2023-06-27
    Description: Sediment core HLY0503-8JPC raised by the HOTRAX'05 expedition from the Mendeleev Ridge was analyzed for multiple lithological, paleontological, and stable-isotopic proxies to reconstruct paleoceanographic conditions in the western Arctic Ocean during the Late Quaternary. The core, extensively sampled in the upper 5 m, reveals pronounced changes in sedimentary environments during the ca. 250 kyr interval encompassing Marine Isotopic Stages (MIS) 1 to 7. An estimated average resolution of 500 yr/sample, at least for the last glacial cycle including the last interglacial, provides more detail than seen in other sedimentary records from the western Arctic Ocean. The age control is provided by 14C and amino acid racemization measurements on planktonic foraminifers and correlations with the stratigraphy developed for the central Lomonosov Ridge and with glacial events at the Eurasian Arctic margin. Cyclic variations in lithology combined with foraminiferal abundance and stable-isotopic composition indicate profound changes in hydrographic and depositional environments between interglacial-type and glacial-type periods apparently reflecting a combination of 100-kyr and precessional time scales. This periodicity is complicated by abrupt iceberg- and/or meltwater-discharge events with variable (Laurentide vs. Eurasian) provenance. The proxy record from the interval identified as the last interglacial (MIS 5e), which may aid in understanding the future state of the Arctic Ocean, indicates low ice conditions and possibly enhanced stratification of the water column.
    Keywords: Age, 14C AMS; Age, 14C calibrated; Age, dated; Age, dated standard deviation; Calendar age; Calendar age, standard deviation; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Healy; Healy-Oden Trans Arctic Expedition 2005 (HOTRAX05); HLY0503; HLY0503-08JPC; JPC; Jumbo Piston Core; Mendeleev Ridge, Arctic Ocean; Sample ID
    Type: Dataset
    Format: text/tab-separated-values, 88 data points
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  • 6
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    Multiple proxies for sediment core HLY0503-03JPC collected from the Northwind Ridge, western Arctic Ocean (2018)
    PANGAEA
    Details
    Publication Date: 2023-07-10
    Keywords: Anhysteretic susceptibility/volume susceptibility; Calcium; Counting; Counting 〉150 µm fraction; Counting 〉63 µm fraction; Cryogenic magnetometer, 2G Enterprises; Density, wet bulk; DEPTH, sediment/rock; Foraminifera, arenaceous; Foraminifera, benthic; Foraminifera, benthic, other; Foraminifera, benthic, polar group; Foraminifera, benthic extinction group; Foraminifera, benthic phytodetritus; Foraminifera, planktic; Grain size, Mastersizer, Malvern Instrument Inc.; Grain size, sieving; Healy; Healy-Oden Trans Arctic Expedition 2005 (HOTRAX05); HLY0503; HLY0503-03JPC; JPC; Jumbo Piston Core; Manganese; Mode, grain size; Northwind Ridge, Arctic Ocean; NRM, Inclination; Size fraction 〉 0.063 mm, sand; Size fraction 〉 0.250 mm; Size fraction 〉 0.500 mm; X-ray computed tomography (CT); X-ray fluorescence ITRAX core scanner
    Type: Dataset
    Format: text/tab-separated-values, 6168 data points
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  • 7
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    ODP Site 162-980 age model and color reflectance record of sediments from ODP Leg 162 sites (1999)
    PANGAEA
    In:  Supplement to: Ortiz, Joseph D; O'Connell, Suzanne B; Mix, Alan C (1999): Data Report: Spectral reflectance observations from recovered sediments. In: Raymo, ME; Jansen, E; Blum, P; Herbert, TD (eds.) Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 162, 1-6, https://doi.org/10.2973/odp.proc.sr.162.029.1999
    Details
    Publication Date: 2024-01-09
    Description: Sediment spectral reflectance measurements were generated aboard the JOIDES Resolution during Ocean Drilling Program Leg 162 shipboard operations. The large size of the raw data set (over 1.3 gigabytes) and limited computer hard disk storage space precluded detailed analysis of the data at sea, although broad band averages were used as aids in developing splices and determining lithologic boundaries. This data report describes the methods used to collect these data and their shipboard and postcruise processing. These initial results provide the basis for further postcruise research.
    Keywords: Ocean Drilling Program; ODP
    Type: Dataset
    Format: application/zip, 3 datasets
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  • 8
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    Calcium carbonate stratigraphy of ODP Site 177-1090 (2002)
    PANGAEA
    In:  Supplement to: O'Connell, Suzanne B; Ortiz, Joseph D (2002): Data Report: Calcium carbonate stratigraphy from sample measurements and diffuse spectral reflectance at Site 1090, ODP Leg 177. In: Gersonde, R; Hodell, DA; Blum, P (eds.) Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 177, 1-24, https://doi.org/10.2973/odp.proc.sr.177.112.2002
    Details
    Publication Date: 2024-01-09
    Description: A total of 776 sediment samples were measured for percent CaCO3 using a coulometer. These data are compared with percent blue reflectance (450-550 nm) measured with the Oregon State University split-core analysis track. In previous studies percent blue reflectance has been an excellent proxy for percent CaCO3 and in this study shows many of the main depositional trends (i.e., a 100-k.y. cycle, with a 55% reflectance range is evident in the upper 900 k.y., underlain by sediments exhibiting a 40-k.y. cycle with only a 30% reflectance range). Between ~21 and 5 Ma the average percent reflectance decreases from ~35% to ~8%. A similar decrease is also recorded between ~24 and 22 Ma. Percent CaCO3 trends closely match those of the percent blue spectral reflectance. This is especially well shown in the 100-k.y. cyclicity and in the interval between 24.5 and 21.5 Ma. In both intervals CaCO3 analyses are abundant. An exception occurs in the interval between 2 and 5 meters composite depth (~193 and 240 k.y.). There, percent CaCO3 and percent reflectance are out of phase. The lack of agreement is not likely to be due to a very wet core, in which water would dominate the spectral reflectance instead of sediment, or to problems with the composite depth slice. The discrepancy remains unexplained and provides clear evidence that when noninvasive measurements are used as proxies for chemical measurements they must be substantiated by the actual chemical or physical measurements.
    Keywords: 177-1090A; 177-1090B; 177-1090D; 177-1090E; DRILL; Drilling/drill rig; Joides Resolution; Leg177; Ocean Drilling Program; ODP; South Atlantic Ocean
    Type: Dataset
    Format: application/zip, 9 datasets
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  • 9
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    (Table 2) Depths and ages of discrete samples from ODP Site 162-983 sediments (1999)
    PANGAEA
    Details
    Publication Date: 2024-01-09
    Keywords: 162-983; AGE; COMPCORE; Composite Core; DEPTH, sediment/rock; DSDP/ODP/IODP sample designation; Joides Resolution; Leg162; Ocean Drilling Program; ODP; Sample code/label; South Atlantic Ocean
    Type: Dataset
    Format: text/tab-separated-values, 65 data points
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  • 10
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    (Table 3) Color reflectance (10 nm intervals) of sediments from ODP Leg 162 sites (1999)
    PANGAEA
    Details
    Publication Date: 2024-01-09
    Keywords: 162-907; 162-980; 162-981; 162-982; 162-983; 162-984; 162-985; 162-986; Color reflectance interval 250-260 nm wavelength; Color reflectance interval 260-270 nm wavelength; Color reflectance interval 270-280 nm wavelength; Color reflectance interval 280-290 nm wavelength; Color reflectance interval 290-300 nm wavelength; Color reflectance interval 300-310 nm wavelength; Color reflectance interval 310-320 nm wavelength; Color reflectance interval 320-330 nm wavelength; Color reflectance interval 330-340 nm wavelength; Color reflectance interval 340-350 nm wavelength; Color reflectance interval 350-360 nm wavelength; Color reflectance interval 360-370 nm wavelength; Color reflectance interval 370-380 nm wavelength; Color reflectance interval 380-390 nm wavelength; Color reflectance interval 390-400 nm wavelength; Color reflectance interval 400-410 nm wavelength; Color reflectance interval 410-420 nm wavelength; Color reflectance interval 420-430 nm wavelength; Color reflectance interval 430-440 nm wavelength; Color reflectance interval 440-450 nm wavelength; Color reflectance interval 450-460 nm wavelength; Color reflectance interval 460-470 nm wavelength; Color reflectance interval 470-480 nm wavelength; Color reflectance interval 480-490 nm wavelength; Color reflectance interval 490-500 nm wavelength; Color reflectance interval 500-510 nm wavelength; Color reflectance interval 510-520 nm wavelength; Color reflectance interval 520-530 nm wavelength; Color reflectance interval 530-540 nm wavelength; Color reflectance interval 540-550 nm wavelength; Color reflectance interval 550-560 nm wavelength; Color reflectance interval 560-570 nm wavelength; Color reflectance interval 570-580 nm wavelength; Color reflectance interval 580-590 nm wavelength; Color reflectance interval 590-600 nm wavelength; Color reflectance interval 600-610 nm wavelength; Color reflectance interval 610-620 nm wavelength; Color reflectance interval 620-630 nm wavelength; Color reflectance interval 630-640 nm wavelength; Color reflectance interval 640-650 nm wavelength; Color reflectance interval 650-660 nm wavelength; Color reflectance interval 660-670 nm wavelength; Color reflectance interval 670-680 nm wavelength; Color reflectance interval 680-690 nm wavelength; Color reflectance interval 690-700 nm wavelength; Color reflectance interval 700-710 nm wavelength; Color reflectance interval 710-720 nm wavelength; Color reflectance interval 720-730 nm wavelength; Color reflectance interval 730-740 nm wavelength; Color reflectance interval 740-750 nm wavelength; Color reflectance interval 750-760 nm wavelength; Color reflectance interval 760-770 nm wavelength; Color reflectance interval 770-780 nm wavelength; Color reflectance interval 780-790 nm wavelength; Color reflectance interval 790-800 nm wavelength; Color reflectance interval 800-810 nm wavelength; Color reflectance interval 810-820 nm wavelength; Color reflectance interval 820-830 nm wavelength; Color reflectance interval 830-840 nm wavelength; Color reflectance interval 840-850 nm wavelength; Color reflectance interval 850-860 nm wavelength; Color reflectance interval 860-870 nm wavelength; Color reflectance interval 870-880 nm wavelength; Color reflectance interval 880-890 nm wavelength; Color reflectance interval 890-900 nm wavelength; Color reflectance interval 900-910 nm wavelength; Color reflectance interval 910-920 nm wavelength; Color reflectance interval 920-930 nm wavelength; Color reflectance interval 930-940 nm wavelength; Color reflectance interval 940-950 nm wavelength; COMPCORE; Composite Core; Depth, composite; DEPTH, sediment/rock; DSDP/ODP/IODP sample designation; Elevation of event; Event label; Iceland Sea; Joides Resolution; Latitude of event; Leg162; Longitude of event; North Greenland Sea; Norwegian Sea; Ocean Drilling Program; ODP; Sample code/label; Sediment reflectance, split-core analysis track (SCAT); South Atlantic Ocean
    Type: Dataset
    Format: text/tab-separated-values, 1682712 data points
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