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  • 1990-1994  (16)
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  • 1
    Electronic Resource
    Electronic Resource
    Paleochemistry of manganese in corals from the Galapagos Islands (1991)
    Springer
    Coral reefs 10 (1991), S. 91-100 
    Details
    ISSN: 1432-0975
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences
    Notes: Abstract Approximately 550 measurements of Mn/Ca ratios in three corals from the western Galapagos Islands have been performed to reconstruct a 380-year history of surface ocean variability with respect to this trace element. The time period studied encompasses 1600 A.D. to 1978. Manganese is inferred to be lattice-bound in coralline aragonite at 10–50% of its seawater proportion to calcium; uncertainty about the distribution coefficient stems from inherent variability of oceanic Mn in nearshore settings. Interannual variations at Urvina Bay, Isabela Island are generally small, with the exception of a few decades during the nineteenth century. A large positive Mn/Ca anomaly found between 1821–1830 is hypothesized to have resulted from a major volcanic eruption on nearby Fernandina Island in 1825. On intrannual timescales a pronounced cycle occurs in response to seasonal upwelling. Quarterly changes in Mn/Ca are six months out-of-phase with Cd/Ca variations-a reflection of the opposite distributions of these metals in the upper waters of the eastern Pacific. High frequency reconstructions over brief time intervals from the 17th, 18th, and 20th century reveal that the seasonal onset of warm and cool phases near Galapagos has persisted for at least 340 years. A quantitative assessment of historical changes in upwelling intensity is complicated by offsets in background Mn levels recorded by different corals. One apparent longterm feature is an overall decline in skeletal Mn concentrations from 1600–1978 which results in a net decrease of 20–30%. Several possible explanations exist for this trend, ranging from accumulation of a persistent diagenetic Mn phase in fossil aragonite to a temporal shift in oceanic/atmospheric Mn fluxes reaching the surface waters of the Galapagos Islands.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00571827
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  • 2
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    Biosiliceous sedimentation at ODP Site 128-798 (1992)
    PANGAEA
    In:  Supplement to: Dunbar, Robert B; deMenocal, Peter B; Burckle, Lloyd H (1992): Late Pliocene-Quaternary biosiliceous sedimentation at Site 798, Japan Sea. In: Pisciotto, KA; Ingle, JCJr.; von Breymann, MT; Barron, J; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 127/128(1), 439-455, https://doi.org/10.2973/odp.proc.sr.127128-1.147.1992
    Details
    Publication Date: 2024-01-09
    Description: Upper Pliocene through Holocene sediments recovered at Site 798 in the Japan Sea (Oki Ridge) exhibit rhythmic variation in weight percent biogenic opal at intervals of ~5 m and periods equivalent to the 41-k.y. obliquity cycle. Variance at 17 and 100 k.y. is observed prior to 1.3 Ma. These cycles are also clearly defined by log data and correspond to clusters of decimeter-scale dark-colored sediment units alternating with clusters of light-colored units. Opal content varies between 3% and 22% between 0 and 1.3 Ma and from 3% to 43% between 1.3 and 2.6 Ma. Long-term opal accumulation rates average 1.8 g/cm**2/k.y. in the late Pliocene/early Pleistocene and decrease by about 60% at ~1.3 Ma. Rough calculations suggest that opal accumulation rates increased and terrigenous flux decreased during the Holocene relative to the last glacial period. Our age control is not yet sufficient to allow a similar analysis of the 41-k.y. cyclicity in opal content throughout the Pleistocene. Stable isotope results from planktonic foraminifers confirm previous suggestions of a strong surface-water freshening event during isotope stage 2; however, this episode appears to be unique during the Pleistocene. Benthic foraminifers are depleted in 18O during parts of glacial stages 2 and 6 relative to adjacent interglacials, suggesting unusual warming and/or freshening of deep waters. Collectively, the stable isotope and %opal data are consistent with continuing isolation of the Japan Sea during the Quaternary with important transitions occurring at 1.3, 0.7 to 1.0, and 0.2 to 0.3 Ma. Complex relationships among the stable isotope results, %opal data, and sediment characteristics such as color and organic and inorganic carbon content preclude development of a simple model to explain cyclical sedimentation. Opal maxima occur within both light and dark intervals and the processes that control surface-water productivity are at times decoupled from the factors that regulate deep-water dysaerobia. We suggest that water column overturn is controlled largely by regional atmospheric circulation that must also have an as yet poorly understood effect on surface-water fertility.
    Keywords: 128-798; 128-798A; 128-798B; 128-798C; COMPCORE; Composite Core; DRILL; Drilling/drill rig; Japan Sea; Joides Resolution; Leg128; Ocean Drilling Program; ODP
    Type: Dataset
    Format: application/zip, 3 datasets
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  • 3
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    (Table 2) Accumulation rates of ODP Site 128-798 (1992)
    PANGAEA
    Details
    Publication Date: 2024-01-09
    Keywords: 128-798; Accumulation rate, mass; Accumulation rate, opal; Accumulation rate, terrigenous; Age, maximum/old; Age, minimum/young; Calcium carbonate; COMPCORE; Composite Core; Density, dry bulk; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Japan Sea; Joides Resolution; Leg128; Ocean Drilling Program; ODP; Opal, biogenic silica; Organic matter; Sedimentation rate
    Type: Dataset
    Format: text/tab-separated-values, 60 data points
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  • 4
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    (Table 1) Age model of ODP Site 128-798C (1992)
    PANGAEA
    Details
    Publication Date: 2024-01-09
    Keywords: 128-798A; 128-798B; 128-798C; Age model; Ageprofile Datum Description; DEPTH, sediment/rock; DRILL; Drilling/drill rig; Event label; Japan Sea; Joides Resolution; Leg128; Ocean Drilling Program; ODP
    Type: Dataset
    Format: text/tab-separated-values, 30 data points
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  • 5
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    (Table 3) Minor element content in ODP Hole 127-797B (1992)
    PANGAEA
    Details
    Publication Date: 2024-01-09
    Keywords: 127-797B; Arsenic; Barium; Copper; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Japan Sea; Joides Resolution; Layer description; Lead; Leg127; Molybdenum; Nickel; Ocean Drilling Program; ODP; Rubidium; Sample code/label; Strontium; Sulfur, total; X-ray fluorescence (XRF); Yttrium; Zinc; Zirconium
    Type: Dataset
    Format: text/tab-separated-values, 28 data points
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  • 6
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    (Table 4) Major and trace elements, TOC and stable carbon and oxygen isotope ratios of ODP Hole 128-798C (1992)
    PANGAEA
    Details
    Publication Date: 2024-01-09
    Keywords: 128-798C; Aluminium oxide; Barium; Calcium oxide; Carbon, organic, total; Carbon dioxide; Cerium; Chromium; Chromium(III) oxide; Copper; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Element analyser CHN, Carlo Erba; Elements, total; Fluorine; Foraminifera, benthic δ13C; Foraminifera, benthic δ18O; Foraminifera, planktic δ13C; Foraminifera, planktic δ18O; Iron oxide, Fe2O3; Isotope ratio mass spectrometry; Japan Sea; Joides Resolution; Lanthanum; Lead; Leg128; Magnesium oxide; Manganese oxide; Nickel; Niobium; Ocean Drilling Program; ODP; Phosphorus pentoxide; Potassium oxide; Rubidium; Sample code/label; Scandium; Silicon dioxide; Sodium oxide; Strontium; Sulfur, total; Sum; Thorium; Titanium dioxide; Uranium; Vanadium; Water in rock; X-ray fluorescence (XRF); Yttrium; Zinc; Zirconium
    Type: Dataset
    Format: text/tab-separated-values, 840 data points
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  • 7
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    (Appendix) Biogenic opal of ODP Site 128-798 (1992)
    PANGAEA
    Details
    Publication Date: 2024-01-09
    Keywords: 128-798; Comment; COMPCORE; Composite Core; DEPTH, sediment/rock; Japan Sea; Joides Resolution; Leg128; Ocean Drilling Program; ODP; Opal, biogenic silica
    Type: Dataset
    Format: text/tab-separated-values, 1825 data points
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  • 8
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    (Table 2) Major element content in ODP Hole 127-797B (1992)
    PANGAEA
    Details
    Publication Date: 2024-01-09
    Keywords: 127-797B; Aluminium; Calcium; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Elements, total; Iron; Japan Sea; Joides Resolution; Layer description; Leg127; Magnesium; Manganese; Ocean Drilling Program; ODP; Phosphorus; Potassium; Sample code/label; Silicon; Sodium; Titanium; X-ray fluorescence (XRF)
    Type: Dataset
    Format: text/tab-separated-values, 65 data points
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  • 9
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    (Table 1) Estimates of missing sediment between each Core of ODP Site 128-798 (1992)
    PANGAEA
    Details
    Publication Date: 2024-01-09
    Keywords: 128-798A; 128-798B; 128-798C; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Event label; Japan Sea; Joides Resolution; Leg128; Ocean Drilling Program; ODP; Sample code/label; Sample code/label 2; Thickness
    Type: Dataset
    Format: text/tab-separated-values, 120 data points
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  • 10
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    Geochemistry of dark-light rhythm sediments of the Japan Sea (1992)
    PANGAEA
    In:  Supplement to: Föllmi, Karl B; Cramp, Adrian; Föllmi, Karl E; Alexandrovich, Joanne M; Brunner, Charlotte A; Burckle, Lloyd H; Casey, Martin; deMenocal, Peter B; Dunbar, Robert B; Grimm, Kurt A; Holler, Peter R; Ingle, James C; Kheradyar, Tara; McEvoy, James; Nobes, David C; Stein, Ruediger; Tada, Ryuji; von Breymann, Marta T; White, Lisa D (1992): Dark-light rhythms in the sediments of the Japan Sea: preliminary results from Site 798, with some additional results from Sites 797 and 799. In: Pisciotto, KA; Ingle, JCJr.; von Breymann, MT; Barron, J; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 127/128(1), 559-576, https://doi.org/10.2973/odp.proc.sr.127128-1.159.1992
    Details
    Publication Date: 2024-01-09
    Description: Ocean Drilling Program Legs 127 and 128 in the Japan Sea have revealed the existence of numerous dark-light rhythms of remarkable consistency in sediments of late Miocene, latest Pliocene, and especially Pleistocene age. Light-colored units within these rhythms are massive or bioturbated, consist of diatomaceous clays, silty clays, or nannofossil-rich clays, and are generally poor in organic matter. Dark-colored units are homogeneous, laminated, or thinly bedded and include substantial amounts of biogenic material such as well-preserved diatoms, planktonic foraminifers, calcareous nannofossils, and organic matter (maximum 7.4 wt%). The dark-light rhythms show a similar geometrical pattern on three different scales: First-order rhythms consist of a cluster dominated by dark-colored units followed by a cluster dominated by light-colored units (3-5 m). Spectral analysis of a gray-value time series suggests that the frequencies of the first-order rhythms in sediments of latest Pliocene and Pleistocene age correlate to the obliquity and the eccentricity cycles. The second-order dark-light rhythms include a light and a dark-colored unit (10-160 cm). They were formed in time spans of several hundred to several ten thousand years, with variance centering around 10,500 yr. This frequency may correspond to half the precessional cycle. Third-order rhythms appear as laminated or thinly bedded dark-light couplets (2-15 mm) within the dark-colored units of the second-order rhythms and may represent annual frequencies. In interpreting the rhythms, we have to take into account that (1) the occurrence of the first- and second-order rhythms is not necessarily restricted to glacial or interglacial periods as is shown by preliminary stable-isotope analysis and comparison with the published d18O record; (2) they appear to be Milankovitch-controlled; and (3) a significant number of the rhythms are sharply bounded. The origin of the dark-light rhythms is probably related to variations in monsoonal activity in the Japan Sea, which show annual frequencies, but also operates in phase with the orbital cycles.
    Keywords: 127-797B; 128-798A; 128-798B; 128-798C; DRILL; Drilling/drill rig; Japan Sea; Joides Resolution; Leg127; Leg128; Ocean Drilling Program; ODP
    Type: Dataset
    Format: application/zip, 4 datasets
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