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  • 1
    Electronic Resource
    Electronic Resource
    Stratigraphy of multiple piston-core sediments for the last 30,000 years from Lake Biwa, Japan (2000)
    Springer
    Journal of paleolimnology 23 (2000), S. 185-199 
    Details
    ISSN: 1573-0417
    Keywords: Lake Biwa ; piston core ; volcanic ash ; magnetic susceptibility ; tephrostratigraphy ; sedimentation rate ; paleoenvironment
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences
    Notes: Abstract Analysis of seven piston cores obtained from three sites in Lake Biwa provide a detailed stratigraphy of the lake sediments for the last 30 kyrs. Description of lithology and measurement of magnetic susceptibility reveal occurrence of volcanic ashes at ten horizons, that were visually observed or microscopically found from clayey sediments. Most ash layers are observed in multiple cores from the three sites and also in earlier cores, establishing correlation and age assignment of the core sediments. This result demonstrates usefulness of magnetic susceptibility data in finding dispersed volcanic ashes. The age-depth curves deduced from published tephra ages show that significant difference in sedimentation rates occurs in Lake Biwa. The central part of the depression is characterized by homogeneous sediments deposited with a high sedimentation rate. The 250-m-thick lacustrine clay in this sub-basin has great potential for high-resolution study of the past environment and paleomagnetism for the last 0.5 Myr.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008079418715
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    Paper (German National Licenses)
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  • 2
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    Benthic foraminiferal abundances from eight sites of the Northwest Australian shelf
    PANGAEA
    In:  Supplement to: Gallagher, Stephen John; Wallace, Malcolm W; Li, Chung Leong; Kinna, Belinda; Bye, John A T; Akimoto, Kazumi; Torii, Masayuki (2009): Neogene history of the West Pacific Warm Pool, Kuroshio and Leeuwin currents. Paleoceanography, 24, PA1206, https://doi.org/10.1029/2008PA001660
    Details
    Publication Date: 2023-05-12
    Description: Foraminiferal analysis of Miocene to recent strata of the Northwest Shelf of Australia is used to chart West Pacific Warm Pool (WPWP) influence. The assemblage is typified by "larger" foraminifera with ingressions of the Indo-Pacific "smaller" taxa Asterorotalia and Pseudorotalia at around 4 Ma and from 1.6 to 0.8 Ma. A review of recent and fossil biogeography of these taxa suggests their stratigraphic distribution can be used to document WPWP evolution. From 10 to 4.4 Ma a lack of biogeographic connectivity between the Pacific and Indian Ocean suggests Indonesian Throughflow (ITF) restriction. During this period, the collision of Australia and Asia trapped warmer waters in the Pacific, creating a central WPWP biogeographic province from the equator to 26°N. By 3 Ma Indo-Pacific species migrated to Japan with the initiation of the "modern" Kuroshio Current coinciding with the intensification of the North Pacific Gyre and Northern Hemisphere ice sheet expansion. Indo-Pacific taxa migrated to the northwest Australia from 4.4 to 4 Ma possibly because of limited ITF. The absence of Indo-Pacific taxa in northwest Australia indicates possible ITF restriction from 4 to 1.6 Ma. Full northwest Australian biogeographic connectivity with the WPWP from 1.6 to 0.8 Ma suggests an unrestricted stronger ITF (compared to today) and the initiation of the modern Leeuwin Current. The extinction of some Indo-Pacific species in northwest Australia after 0.8 Ma may be related to the effects of large glacial/interglacial oscillations and uplift of the Indonesian Archipelago causing Indonesian seaway restriction.
    Keywords: AGE; Assilina ammonoides; Asterorotalia concinna; Asterorotalia gaimardii; Asterorotalia milletti; Asterorotalia sp.; Austin-1; Bounty-1; Counting; Counting, foraminifera, benthic; DEPTH, sediment/rock; Event label; Foraminifera; Foraminifera, benthic; Foraminifera, per unit sediment mass; Goodwyn-6; Goodwyn-7; Heterolepa margaritifera; Maitland-1; Matiland_North-1; North west Australian continental margin; Nummulites venosa; Plankton; Pseudorotalia angusta; Pseudorotalia globosa; Pseudorotalia indopacifica; Pseudorotalia schroeteriana; Tryal_Rocks-1; West_Tryal_Rocks-1
    Type: Dataset
    Format: text/tab-separated-values, 1254 data points
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  • 3
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    Planktonic foraminifera of ODP Hole 107-654A (1990)
    PANGAEA
    In:  Supplement to: Glacon, Georgette; Vergnaud-Grazzini, Colette; Iaccarino, Silvia Maria; Réhault, Jean-Pierre; Randrianasolo, Auran; Sierro, Francisco Javier; Weaver, Philip PE; Channell, James E T; Torii, Masayuki; Hawthorne, Teresa B (1990): Planktonic foraminiferal events and stable isotope records in the Upper Miocene, Site 654. In: Kastens, KA; Mascle, J; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 107, 415-427, https://doi.org/10.2973/odp.proc.sr.107.157.1990
    Details
    Publication Date: 2024-01-09
    Description: The late Miocene sediments of the Tyrrhenian ODP Site 654 encompass a deepening sequence which begins with glauconite shallow water sands followed by a rapid transition to deep water sediments and culminates with dolomitic mudstones associated with Messinian evaporites. The sequence compares well with the so-called 'Sahelian cycle' and with post-orogenic cycles recognized in peninsular Italy and Sicily. The studied interval, consisting of 55 m thick nannofossil oozes, belongs to the Globorotalia suterae subzone and lower part of the Globorotalia conomiozea Zone, indicating late Tortonian and early Messinian age, respectively. Biomagnetostratigraphic correlation assigns the Tortonian/ Messinian boundary an age of 6.44-6.45 Ma. In addition, six main events have been recognized, based on the range of keeled globorotaliids and coiling direction changes of keeled and unkeeled globorotaliids, which have been correlated to the geomagnetic time-scale. Comparison with North Atlantic sites and land sections of the Guadalquivir basin and northern Morocco provides good correlations with the events documented in these areas. In particular, Event IV, which predates the FO of Globorotalia conomiozea, may be used to recognize the Tortonian/Messinian boundary in extra-Mediterranean areas where G. conomiozea is missing. Variations in the distribution of different species of Globigerinoides are related to changes in the surficial marine environment. Although no clear trends can be recognized on the oxygen and carbon isotope records of Globigerinoides obliquus, the parallelism between the occurrence of low salinity species (G. sacculifer) and peaks of low 5180 values, as well as that of normal salinity species (G. obliquus) and peaks of high d18O values, suggests strong local changes of environmental conditions. The high amplitude of the fluctuations of d18O values suggests important variations in the salinity of the Tyrrhenian Sea, related to a rapidly changing water budget. The major feature of the carbon isotope record is a large decrease between 7.0 and 6.95 Ma, which therefore predates the 6.2 Ma global 'carbon shift'.
    Keywords: 107-654A; DRILL; Drilling/drill rig; Joides Resolution; Leg107; Ocean Drilling Program; ODP; Tirreno Sea
    Type: Dataset
    Format: application/zip, 3 datasets
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  • 4
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    Magnetostratigraphy of ODP Leg 107 holes (1990)
    PANGAEA
    In:  Supplement to: Channell, James E T; Torii, Masayuki; Hawthorne, Teresa B (1990): Magnetostratigraphy of sediments recovered at sites 650, 651, 652 and 654 (Leg 107 in the Tyrrhenian Sea). In: Kastens, KA; Mascle, J; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 107, 335-346, https://doi.org/10.2973/odp.proc.sr.107.167.1990
    Details
    Publication Date: 2024-01-09
    Description: Apart from Site 650, core disturbance due to rotary drilling severely compromised the quality of the magnetostratigraphic data obtained from Leg 107 sediments. The correlation of polarity zones to the geomagnetic polarity time scale cannot be made solely on the basis of pattern fit. The proposed correlations are consistent between sites, and this consistency is constrained by the biostratigraphic datums. The resulting biomagnetostratigraphic correlations are reviewed in the synthesis section of this volume. The purpose of this paper is to document the magnetic stratigraphies, and present the preferred correlation to the geomagnetic reversal time scale. Four implications of the proposed correlations are: (1) The Mio-Pliocene boundary occurs in the lowest reversed interval of the Gilbert (Chron 3r) at about 4.9 Ma. (2) The thick pre-Pliocene lacustrine sequence recovered at Site 652 appears to have been deposited entirely within a single reversed polarity chron (Chron 3r). (3) The balatino-type gypsum recovered at Site 654 was also deposited entirely within this polarity chron (Chron 3r). (4) The Tortonian-Messinian boundary occurs within a normal polarity zone which is probably correlative to Chron 6 (Chron 3B) giving a boundary age of about 6.4 Ma.
    Keywords: 107-650A; 107-651A; 107-652A; 107-654A; DRILL; Drilling/drill rig; Joides Resolution; Leg107; Ocean Drilling Program; ODP; Tirreno Sea
    Type: Dataset
    Format: application/zip, 4 datasets
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  • 5
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    Magnetic properties and paleomagnetism of basalts from ODP Leg 107 basalts (1990)
    PANGAEA
    In:  Supplement to: Vigliotti, Luigi; Torii, Masayuki; Channell, James E T (1990): Magnetic properties and paleomagnetism of basalts from Leg 107 (Holes 651A and 655B). In: Kastens, KA; Mascle, J; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 107, 99-110, https://doi.org/10.2973/odp.proc.sr.107.165.1990
    Details
    Publication Date: 2024-01-09
    Description: The basalts recovered at Holes 651A and 655B appear to carry a single component remanent magnetization, which is generally of reversed polarity. These magnetizations are consistent with eruption during the Matuyama (651A) and Gilbert (655B) polarity epochs. The blocking temperature spectra and the Js/T curves indicate that titanomaghemite is the principal remanence carrier. The lower mean destructive field (MDF) and higher susceptibility at 651A probably indicates a lower mean oxidation state at this hole relative to 655B, which may simply reflect the age difference between the two basalt sequences. At both holes, a decreasing downcore trend both in natural remanent magnetization (NRM) and susceptibility probably indicates that maghemitization (from primary titanomagnetite) increases downcore. An interval of high coercivity at hole 655B (119.80-151.45 mbsf) appears to define a magnetically distinct unit within the basalt sequence.
    Keywords: 107-651A; 107-655B; DRILL; Drilling/drill rig; Joides Resolution; Leg107; Ocean Drilling Program; ODP; Tirreno Sea
    Type: Dataset
    Format: application/zip, 2 datasets
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  • 6
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    (Table S1) Age determination of Emperor Seamounts basement (2003)
    PANGAEA
    In:  Supplement to: Tarduno, John A; Duncan, Robert A; Scholl, David W; Cottrell, Rory D; Steinberger, Bernhard; Thordarson, Thorvaldur; Kerr, Bryan C; Neal, Clive R; Frey, Frederick A; Torii, Masayuki; Carvallo, Claire (2003): The Emperor Seamounts: Southward motion of the Hawaiian hotspot plume in earth's mantle. Science, 301(5636), 1064-1069, https://doi.org/10.1126/science.1086442
    Details
    Publication Date: 2024-01-09
    Description: The Hawaiian-Emperor hotspot track has a prominent bend, which has served as the basis for the theory that the Hawaiian hotspot, fixed in the deep mantle, traced a change in plate motion. However, paleomagnetic and radiometric age data from samples recovered by ocean drilling define an age-progressive paleolatitude history, indicating that the Emperor Seamount trend was principally formed by the rapid motion (over 40 millimeters per year) of the Hawaiian hotspot plume during Late Cretaceous to early-Tertiary times (81 to 47 million years ago). Evidence for motion of the Hawaiian plume affects models of mantle convection and plate tectonics, changing our understanding of terrestrial dynamics.
    Keywords: 19-192; 197-1203A; 197-1204B; 197-1205A; 197-1206A; Age, 40Ar/39Ar Argon-Argon; Age, dated; Age, dated standard deviation; Argon-40/Argon-36; Argon-40/Argon-36, standard deviation; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Event label; Glomar Challenger; Joides Resolution; Leg19; Leg197; North Pacific/GUYOT; North Pacific Ocean; Ocean Drilling Program; ODP; Sample code/label; Sample comment
    Type: Dataset
    Format: text/tab-separated-values, 222 data points
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  • 7
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    (Table T1) Magnetic properties of MORB from ODP Leg 187 sites (2004)
    PANGAEA
    In:  Supplement to: Shau, Yen-Hong; Torii, Masayuki; Horng, Chorng-Shern; Liang, Wen-Tzong (2004): Magnetic properties of mid-ocean-ridge basalts from Ocean Drilling Program Leg 187. In: Pedersen, RB; Christie, DM; Miller, DJ (eds.) Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 187, 1-25, https://doi.org/10.2973/odp.proc.sr.187.204.2004
    Details
    Publication Date: 2024-01-09
    Description: The core samples of mid-ocean-ridge basalts (including Indian and Pacific type) recovered from the Southeast Indian Ridge (SEIR) area near the Australian Antarctic Discordance during Ocean Drilling Program Leg 187 were studied using rock magnetism, mineralogy, and petrography methods. On the basis of thermomagnetic analyses and low-temperature magnetometry, the dominant magnetic carrier in most of the basalt samples (pillow basalts) is characterized as titanomaghemite, which presumably formed by low-temperature oxidation of primary titanomagnetite. Some samples from unaltered massive basalts contain nearly unoxidized titanomagnetite as the main magnetic mineral. A metadiabase sample showing greenschist facies metamorphism contains magnetic minerals dominated by magnetite. The pillow basalts contain titanomaghemite ranging from stable single-domain to pseudosingle-domain (PSD) grains, and the majority are characterized by a single stable component of remanence. The massive basalts show hysteresis features of larger PSD grains and contain a very low coercivity remanence. The values of natural remanent magnetization (NRM) of the samples in this SEIR area are on the same order as those of other oceanic ridge basalts. They show a general decreasing trend of NRM with increasing crust age. However, the values of NRM show no correlation either with the tectonic zonations (Zone A vs. Zone B) or with the mantle provinces (Pacific vs. Indian types).
    Keywords: 187-1152A; 187-1152B; 187-1153A; 187-1154A; 187-1155A; 187-1155B; 187-1156A; 187-1156B; 187-1157A; 187-1157B; 187-1158A; 187-1158B; 187-1158C; 187-1159A; 187-1160A; 187-1160B; 187-1161A; 187-1161B; 187-1162A; 187-1162B; 187-1163A; 187-1164A; 187-1164B; Bartington MS2 magnetic susceptibility meter; Coercive force; Coercivity of remanence; Coercivity of remanence/coercive force; Curie temperature; Depth, relative; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Event label; Hysteresis, saturation magnetization, per unit volume; Hysteresis, saturation magnetization/ saturation remanence; Hysteresis, saturation remanence, per unit volume; Indian Ocean; Joides Resolution; Leg187; MAG; Magnetic susceptibility, volume; Magnetometer; Magnetometer, spinner (SMD-88); NRM, Intensity; Ocean Drilling Program; ODP; Sample code/label; Sample comment; Sample ID
    Type: Dataset
    Format: text/tab-separated-values, 1411 data points
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  • 8
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    (Table 1) Polarity boundaries observed in ODP Leg 127/128 sites (1992)
    PANGAEA
    Details
    Publication Date: 2024-01-09
    Description: We present the magnetostratigraphic data for Sites 794, 795, 797, 798, and 799 in the Japan Sea. APC cores from these sites record the polarity sequence for the Pliocene-Pleistocene period. The intensity of the magnetization decreases with depth by more than an order of magnitude, and the low intensity samples tend to give scattered directional data. The cause of these phenomena is examined based on the correlation of the intensity with the bulk magnetic susceptibility.
    Keywords: 127-794; 127-795; 127-797; 128-798; 128-799; Age model; Ageprofile Datum Description; COMPCORE; Composite Core; DEPTH, sediment/rock; Event label; Japan Sea; Joides Resolution; Leg127; Leg128; Ocean Drilling Program; ODP
    Type: Dataset
    Format: text/tab-separated-values, 110 data points
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  • 9
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    (Table 1) Rock magnetic properties of the sediment samples from ODP Hole 127-797B (1992)
    PANGAEA
    In:  Supplement to: Torii, Masayuki; Hayashida, Akira; Vigliotti, Luigi; Wippern, Jobst J M (1992): Rock magnetic properties of sediments from Site 797, Japan Sea. In: Tamaki, K; Suychiro, K; Allan, J; McWilliams, M; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 127/128(2), 947-957, https://doi.org/10.2973/odp.proc.sr.127128-2.213.1992
    Details
    Publication Date: 2024-01-09
    Description: Paleomagnetic and rock magnetic studies of the sediment samples from Site 797 were carried out. Thermal demagnetization was found to be more effective in removing secondary overprinting than alternating field demagnetization. Production of new magnetic minerals during the thermal treatment was frequently observed and made thorough demagnetization difficult, however. Thermal demagnetization of orthogonal IRM's suggests that magnetite and pyrrhotite are common magnetic minerals in these sediments. The Lowrie-Fuller test and xARM/x ratio show apparent grain size of the magnetic minerals to be that of single-domain to small multi-domain state. A downcore decrease of rock magnetic parameters such as ARM, IRM, and xARM/x ratio in the upper half of the hole indicates progressive diagenetic dissolution of finer magnetic minerals. In the lower part where igneous rocks intruded, production of magnetic minerals is suggested by discontinuous change of the downcore trend, which may have brought remagnetization of the sediment samples.
    Keywords: 127-797B; Anhysteretic remanent magnetization, Intensity, per unit mass; ARM, median destructive field of anhysteretic remanent magnetization; ARM, Susceptibility, per unit mass; DEPTH, sediment/rock; Difference; DRILL; Drilling/drill rig; Dry mass; DSDP/ODP/IODP sample designation; IRM, median destructive field of isothermal remanent magnetization; Isothermal remanent magnetization, Intensity, per unit mass; Japan Sea; Joides Resolution; Leg127; Ocean Drilling Program; ODP; Ratio; Sample code/label; Sample comment; Silt-Skewness; Susceptibility, specific; Type
    Type: Dataset
    Format: text/tab-separated-values, 463 data points
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  • 10
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    (Figure 1) Range chart of planktonic foraminiferal species at ODP Hole 107-654A (1990)
    PANGAEA
    Details
    Publication Date: 2024-01-09
    Keywords: -; 107-654A; Dentoglobigerina altispira; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Globigerina bulloides; Globigerina decoraperta; Globigerina nepenthes; Globigerinoides bulloides; Globigerinoides extremus; Globigerinoides obliquus; Globigerinoides quadrilobatus; Globigerinoides ruber; Globigerinoides sacculifer; Globigerinoides trilobus; Globorotalia cibaoensis; Globorotalia conoidea; Globorotalia conomiozea; Globorotalia exserta; Globorotalia juanai; Globorotalia limbata dextral; Globorotalia limbata sinistral; Globorotalia mediterranea; Globorotalia menardii dextral; Globorotalia menardii sinistral; Globorotalia nicoli; Globorotalia plesiotumida dextral; Globorotalia plesiotumida sinistral; Globorotalia saheliana; Globorotalia scitula dextral; Globorotalia scitula sinistral; Globorotalia sp.; Globorotalia sphericomiozea; Globorotalia subconomiozea; Globorotalia suterae; Globorotalia ventriosa; Joides Resolution; Leg107; Neogloboquadrina acostaensis dextral; Neogloboquadrina acostaensis sinistral; Neogloboquadrina humerosa; Ocean Drilling Program; ODP; Orbulina universa; Sample code/label; Tirreno Sea
    Type: Dataset
    Format: text/tab-separated-values, 6783 data points
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