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  • 2015-2019  (10)
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  • 1
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    Sedimentary perspectives of Pleistocene ocean circulation and climate change from the southernmost Chilean continental margin (2019)
    American Geophysical Union
    In:  EPIC3AGU Centennial Fall Meeting, San Francisco, CA, USA, 2019-12-09-2019-12-13American Geophysical Union
    Details
    Publication Date: 2020-05-14
    Description: IODP Exp. 383 recovered two Pleistocene sedimentary sequences from the upper continental slope along the southernmost Chilean margin that are well positioned to monitor changes in the Antarctic Circumpolar Current (ACC) upstream of the Drake Passage and the history of Patagonian glaciation. These sites are characterized by high sedimentation rates and a complex distribution of siliciclastic sediments with infrequent decimeter-scale beds of calcareous biogenic sediments. Unravelling ocean circulation and climate history from these sites requires a primary understanding of sedimentary provenance and transport mechanisms derived from a complete lithological characterization of the sequence. Here, we integrate downcore shipboard physical properties with sedimentological observations to fully characterize the sequences, evaluate potential for correlation and constrain regional depositional processes. Site U1542 (52°S; 1101 m water depth) consists of a 249 m spliced sedimentary sequence containing Middle Pleistocene to Holocene sediments. It mainly consists of clayey silt that is often interbedded with thin (~75 cm) beds of calcareous sand-bearing clayey to sandy silt with foraminifera and nannofossils or foraminifera-rich nannofossil ooze. Site U1544 (55°S; 2090 m water depth) consists of a 98 m sedimentary sequence obtained from a single hole. Sediments are also dominated by silty clay, but exhibit slightly thicker beds of calcareous ooze and a significantly higher proportion of cm- to dm-scale sand beds that are interpreted as turbidites. Based on the lithology of the recovered sediments and proximity to a glaciated continental margin, terrigenous sediment is likely delivered to these locations by a combination of ice rafting, glacial meltwater plumes, episodic downslope transport from the outer continental shelf and fine-grained sediments transported by the Cape Horn Current entering the Drake Passage as the northern branch of the ACC.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , notRev
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  • 2
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    High-resolution and high-precision correlation of dark and light layers in the Quaternary hemipelagic sediments of the Japan Sea recovered during IODP Expedition 346 (2018)
    Springer
    Details
    Publication Date: 2022-05-25
    Description: © The Author(s), 2018. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Progress in Earth and Planetary Science 5 (2018): 19, doi:10.1186/s40645-018-0167-8.
    Description: The Quaternary hemipelagic sediments of the Japan Sea are characterized by centimeter- to decimeter-scale alternation of dark and light clay to silty clay, which are bio-siliceous and/or bio-calcareous to a various degree. Each of the dark and light layers are considered as deposited synchronously throughout the deeper (〉 500 m) part of the sea. However, attempts for correlation and age estimation of individual layers are limited to the upper few tens of meters. In addition, the exact timing of the depositional onset of these dark and light layers and its synchronicity throughout the deeper part of the sea have not been explored previously, although the onset timing was roughly estimated as ~ 1.5 Ma based on the result of Ocean Drilling Program legs 127/128. Consequently, it is not certain exactly when their deposition started, whether deposition of dark and light layers was synchronous and whether they are correlatable also in the earlier part of their depositional history. The Quaternary hemipelagic sediments of the Japan Sea were drilled at seven sites during Integrated Ocean Drilling Program Expedition 346 in 2013. Alternation of dark and light layers was recovered at six sites whose water depths are 〉 ~ 900 m, and continuous composite columns were constructed at each site. Here, we report our effort to correlate individual dark layers and estimate their ages based on a newly constructed age model at Site U1424 using the best available paleomagnetic datum and marker tephras. The age model is further tuned to LR04 δ18O curve using gamma ray attenuation density (GRA) since it reflects diatom contents that are higher during interglacial high-stands. The constructed age model for Site U1424 is projected to other sites using correlation of dark layers to form a high-resolution and high-precision paleo-observatory network that allows to reconstruct changes in material fluxes with high spatio-temporal resolutions.
    Description: This work was supported by a grant from IODP Exp. 346 After Cruise Research Program, JAMSTEC, awarded to TR, IK, Irino T, Itaki T, ST, KY, SS, and KA and from JSPS KAKENHI grant number 16H01765 awarded to TR.
    Keywords: Quaternary sediments ; Japan Sea ; Inter-site correlation ; High-resolution age model ; IODP ; Expedition 346 ; U1424 ; U1425 ; U1426 ; U1430
    Repository Name: Woods Hole Open Access Server
    Type: Article
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  • 3
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    Abundance of planktonic foraminifera from IODP Hole 339-U1386C (2017)
    PANGAEA
    In:  Supplement to: Ducassou, Emmanuelle; Fournier, L A; Sierro, Francisco Javier; Alvarez Zarikian, Carlos A; Lofi, Johanna; Flores, José-Abel; Roque, C (2016): Origin of the large Pliocene and Pleistocene debris flows on the Algarve margin. Marine Geology, 377, 58-76, https://doi.org/10.1016/j.margeo.2015.08.018
    Details
    Publication Date: 2023-06-27
    Description: The base of the Faro contouritic drift (IODP Site U1386) on the northern margin of the Gulf of Cádiz (Algarve margin) is characterized by two sequences of frequent gravity deposits with different ages and compositions. Among these gravity deposits, several relatively thick debrites (up to 12 m) have been observed and studied in detail. Sedimentological analyses have been performed and because of non-turbulent behavior of debris flows, detailed micropaleontological studies could be realized. Planktonic foraminifera thus allowed establishing a detailed biostratigraphy of these deposits. Benthic foraminifer and ostracod assemblageswere used to evaluate the origin of the sediment composing these debris flows and estimate their run-out distance. These debrites are dated fromEarly Pliocene and early Pleistocene, andwere deposited in amesobathyal environment. They comprise silty mud clasts and matrixes with sand content up to 34%. The Early Pliocene debrites are bioclast-rich whereas the Early Pleistocene debrite is enriched in terrigenous particles. The data indicates that these debrites were triggered on the continental shelf and traveled less than 100 km, eroding the seafloor all along their path for the Early Pliocene debrites and only the first part of their path for the early Pleistocene debrite.Matrixes originate fromfailure areaswhereas eroded sediments along the flow pathway are incorporated into the flow as clasts. High abundance of shelf fauna during the Early Pliocene and great supply of terrigenous particles from rivers during the early Pleistocene in the south-western Iberian margin have favored gravity flows fromthe continental shelf to the slope. The contouritic paleo-moat of the Faro drift has been a determining channeling feature for gravity flows along the Algarve margin during the early Pleistocene, testifying of the strong interaction between MOW circulation and down-slope processes. Tectonic and diapiric activities were significant during Early Pliocene and early Pleistocene on the Algarve margin and could have been triggering parameters of failures related to these debris flows.
    Keywords: 339-U1386C; Abundance estimate; Beella digitata; Dentoglobigerina altispira; Dentoglobigerina baroemoenensis; DEPTH, sediment/rock; Description; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Exp339; Foraminifera, planktic indeterminata; Globigerina apertura; Globigerina bulloides; Globigerina calida; Globigerina falconensis; Globigerina obesa; Globigerinella aequilateralis; Globigerinella siphonifera; Globigerinita glutinata; Globigerinoides conglobatus; Globigerinoides extremus; Globigerinoides immaturus; Globigerinoides ruber white; Globigerinoides sacculifer; Globorotalia cf. crassula; Globorotalia crassaformis; Globorotalia hirsuta dextral; Globorotalia hirsuta sinistral; Globorotalia inflata dextral; Globorotalia inflata sinistral; Globorotalia margaritae; Globorotalia menardii; Globorotalia miocenica; Globorotalia puncticulata dextral; Globorotalia puncticulata sinistral; Globorotalia scitula dextral; Globorotalia scitula sinistral; Globorotalia truncatulinoides dextral; Globorotalia truncatulinoides sinistral; Globoturborotalita rubescens; Globoturborotalita tenella; Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP; Joides Resolution; Lithologic unit/sequence; Mediterranean Outflow; Neogloboquadrina atlantica dextral; Neogloboquadrina atlantica sinistral; Neogloboquadrina pachyderma dextral; Neogloboquadrina pachyderma sinistral; Orbulina universa; Sample code/label; Sphaeroidinella dehiscens; Sphaeroidinellopsis seminulina; Sphaeroidinellopsis subdehiscens; Turborotalita quinqueloba
    Type: Dataset
    Format: text/tab-separated-values, 1137 data points
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  • 4
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    Ostracode abundance and Simpson's index over the past 700,000 years at IODP Site 346-U1427 (2018)
    PANGAEA
    In:  Supplement to: Huang, Huai-Hsuan May; Yasuhara, Moriaki; Iwatani, Hokuto; Alvarez Zarikian, Carlos A; Bassetti, Maria Angela; Sagawa, Takuya (2018): Benthic Biotic Response to Climate Changes Over the Last 700,000 Years in a Deep Marginal Sea: Impacts of Deoxygenation and the Mid‐Brunhes Event. Paleoceanography and Paleoclimatology, 33(7), 766-777, https://doi.org/10.1029/2018PA003343
    Details
    Publication Date: 2023-07-10
    Description: The Sea of Japan is a marginal sea, semi-enclosed by the Eurasian Continent, Korean Peninsula, Japanese archipelago, and connected to the Pacific Ocean and adjacent seas by three shallow straits (water depths 〈 130 m). Marginal seas are ideal natural laboratories to study biotic responses to large-scale environmental changes as they are typically sensitive to glacial-interglacial and stadial-interstadial climatic cycles. However, only limited number of studies covers time periods beyond 1 to 2 glacial-interglacial cycles. Here we present a 700,000-year record of benthic biotic response to past oceanographic changes in the southern Sea of Japan, covering the past seven glacial-interglacial cycles, based on ostracode assemblages at the IODP Site U1427. The results indicate that the long-term oxygen variability has been a major control of deep marginal sea biota. Five local extirpation events were recognized as barren zones during glacial maxima (i.e., sea-level minima) immediately before terminations I, II, IV, V, and VII in MISs 2, 6, 10, 12, and 16, which are probably caused by bottom-water oxygen depletion. The results of multivariate analyses indicated clear faunal cyclicity influenced by glacial-interglacial scale oxygen variability with the succession from opportunistic species dominance through tolerant infauna dominance to barren zone during the deoxygenation processes and the opposite succession during the recovery processes. The Sea of Japan ostracode abundance and faunal composition showed distinct difference between the post- and pre-MBE (Mid-Brunhes Event at around 400-350 ka) periods, indicating the MBE as a major disturbance event of deep-sea, especially marginal-sea ecosystems. The MBE shortened the duration of the extirpation events, fostered dominance of warmer-water species, and amplified the glacial-interglacial faunal cyclicity. Our long-term biotic response study clearly indicates that deep marginal sea ecosystems are dynamic and vulnerable to climate changes.
    Keywords: 346-U1427; Acanthocythereis dunelmensis; Acanthocythereis sp.; AGE; Argilloecia sp.; Asian Monsoon; Calculated after Simpson-Index; CDRILL; Core drilling; Counting; Cytheropteron hyalinosa; DEPTH, sediment/rock; Exp346; Falsobuntonia sp.; Falsobuntonia taiwanica; Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP; Joides Resolution; Krithe antisawanense; Krithe sawanensis; Loxoconchidea dolgoiensis; Ostracoda; Ostracoda, other; Palmenella limicola; Palmoconcha parapontica; Robertsonites hanaii; Sample code/label; Sample volume; Sea of Japan/East Sea; Simpson index of diversity
    Type: Dataset
    Format: text/tab-separated-values, 7389 data points
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  • 5
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    (Table 3) Radiocarbon ages from different Holes of IODP Exp339 (2017)
    PANGAEA
    In:  Supplement to: Takashimizu, Yasuhiro; Kawamura, R; Rodríguez-Tovar, Francisco Javier; Dorador, Javier; Ducassou, Emmanuelle; Hernandéz-Molina, Francisco Javier; Stow, Dorrik A V; Alvarez-Zarikian, Carlos A (2016): Reworked tsunami deposits by bottom currents: Circumstantial evidences from Late Pleistocene to Early Holocene in the Gulf of Cádiz. Marine Geology, 377, 95-109, https://doi.org/10.1016/j.margeo.2015.09.009
    Details
    Publication Date: 2023-08-16
    Description: Younger Sand layers (YSLs) have been identified in drill cores of a Late Glacial to Early Holocene muddy contourite succession from the Gulf of Cádiz. In this study, we evaluate the grain size characteristics of the YSL, which display bi-gradational grading, with inverse grading (from silt to fine- or medium-grained sand) followed by normal grading (from fine- or medium-grained sand to silt). Radiocarbon dating shows that the YSL formed at three distinct times: 1) the Bølling-Allerød (sites U1387 and U1386); 2) the Younger Dryas (site U1390), and; 3) the beginning of the Boreal (site U1389). Ichnological analyses and radiocarbon dating of cores from drill site U1389C indicate that the YSLs consist of reworked materials deposited at a high sedimentation rate. The results of sedimentological analyses, ichnological treatment, spatial distributions, and radiocarbon dating of the YSLs suggest that the possibility of an origin of the YSLs is tsunami-related but later reworked by bottom current. However, the source areas of the sandy sediments remain unclear, although our results show them to be variable and area dependent. Some sandy deposits are transported by the Mediterranean Outflow Water (MOW) from the proximal sector of the Gulf of Cádiz Contourite Depositional System (CDS), which is close to the Strait of Gibraltar. However, in other cases it is more probable that local gravity flows, which are the result of instability on adjacent margins, provide the sandy material.
    Keywords: 339-U1386A; 339-U1387A; 339-U1389C; 339-U1390B; 339-U1390C; AGE; Age, 14C AMS; Age, dated material; Age, standard deviation; Calendar age; Calibration; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Event label; Exp339; Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP; Joides Resolution; Laboratory code/label; Latitude of event; Longitude of event; Median probability age; Mediterranean Outflow; Reservoir effect/correction; Sample code/label
    Type: Dataset
    Format: text/tab-separated-values, 99 data points
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    DATA PANGAEA
  • 6
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    Age model tie-lines from IODP Hole 359-U1467 (2019)
    PANGAEA
    Details
    Publication Date: 2024-04-26
    Keywords: 359-U1467; AGE; CDRILL; Core drilling; Depth, composite; Exp359; Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP; Joides Resolution; MAL-9A; Maldives
    Type: Dataset
    Format: text/tab-separated-values, 180 data points
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    DATA PANGAEA
  • 7
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    Age, sedimentation rate, bulk density (Grape) and Fe flux from IODP Hole 359-U1467 (2019)
    PANGAEA
    Details
    Publication Date: 2024-04-26
    Keywords: -; 359-U1467; AGE; Calculated; CDRILL; Core drilling; Density; Exp359; Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP; Iron; Iron, flux; Joides Resolution; MAL-9A; Maldives; Sedimentation rate; X-ray fluorescence (XRF)
    Type: Dataset
    Format: text/tab-separated-values, 10005 data points
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  • 8
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    X-ray fluorescence comparison between conventional XRF (University of Edinburgh) and XRF core-scanner (Texas A&M University) from IODP hole 359-U1467 (2019)
    PANGAEA
    Details
    Publication Date: 2024-04-26
    Keywords: 359-U1467; CDRILL; Core drilling; DEPTH, sediment/rock; Exp359; Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP; Iron/Potassium ratio; Joides Resolution; Leibniz Centre for Tropical Marine Research; MAL-9A; Maldives; X-ray fluorescence spectrometry; ZMT
    Type: Dataset
    Format: text/tab-separated-values, 403 data points
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  • 9
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    Composite splice, age and element intensities from IODP Hole 359-U1467 (2019)
    PANGAEA
    Details
    Publication Date: 2024-04-26
    Keywords: 359-U1467; AGE; Aluminium; Calcium; CDRILL; Core drilling; Depth, composite; Exp359; Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP; Iron; Joides Resolution; MAL-9A; Maldives; Potassium; Silicon; Titanium; X-ray fluorescence (XRF)
    Type: Dataset
    Format: text/tab-separated-values, 15631 data points
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  • 10
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    Non-destructive core scanning Composition of lithogenic fraction Orbital cycles Indian-Asian history of aridity Mid Pleistocene transition from IODP Hole359-U1467 (2019)
    PANGAEA
    In:  Supplement to: Kunkelova, Tereza; Jung, Simon J A; de Leau, Erica S; Odling, Nick; Thomas, Alex L; Betzler, Christian; Eberli, Gregor P; Alvarez-Zarikian, Carlos A; Alonso-Garcia, Montserrat; Bialik, Or M; Blättler, Clara L; Guo, Junhua Adam; Haffen, Sébastien; Horozal, Senay; Mee, Laurence; Inoue, Mayuri; Jovane, Luigi; Lanci, Luca; Laya, Juan Carlos; Lüdmann, Thomas; Bejugam, Nagender N; Nakakuni, Masatoshi; Niino, Hiroshi; Petruny, Loren M; Pratiwi, Santi D; Reijmer, John J G; Reolid, Jesus; Slagle, Angela L; Sloss, Craig; Su, Xiang; Swart, Peter K; Wright, James D; Yao, Zhengquan; Young, J R; Lindhorst, Sebastian; Stainbank, Stephanie; Rueggeberg, Andres; Spezzaferri, Silvia; Carrasqueira, Igor; Yu, Siyao M; Kroon, Dick (2018): A two million year record of low-latitude aridity linked to continental weathering from the Maldives. Progress in Earth and Planetary Science, 5(1), https://doi.org/10.1186/s40645-018-0238-x
    Details
    Publication Date: 2024-04-26
    Description: Indian-Asian monsoon has oscillated between warm/wet interglacial periods and cool/dry glacial periods with periodicities closely linked to variations in Earth's orbital parameters. However, processes that control wet versus dry, i.e. aridity cyclical periods on the orbital time-scale in the low latitudes of the Indian-Asian continent remain poorly understood because records over millions of years are scarce. The sedimentary record from International Ocean Discovery Program (IODP) Expedition 359 provides a well-preserved, high-resolution, continuous archive of lithogenic input from the Maldives reflecting on low-latitude aridity cycles. Variability within the lithogenic component of sedimentary deposits of the Maldives results from changes in monsoon-controlled sedimentary sources. Here, we present X-ray fluorescence (XRF) core-scanning results from IODP Site U1467 for the past two million years, allowing full investigation of orbital periodicities. We specifically use the Fe/K as a terrestrial climate proxy reflecting on wet versus dry conditions in the source areas of the Indian-Asian landmass, or from further afield. The Fe/K record shows orbitally forced cycles reflecting on changes in the relative importance of aeolian (stronger winter monsoon) during glacial periods versus fluvial supply (stronger summer monsoon) during interglacial periods. For our chronology, we tuned the Fe/K cycles to precessional insolation changes, linking Fe/K maxima/minima to insolation minima/maxima with zero phase lag. Wavelet and spectral analyses of the Fe/K record show increased dominance of the 100 kyr cycles after the Mid Pleistocene Transition (MPT) at 1.25 Ma in tandem with the global ice volume benthic δ18O data (LR04 record). In contrast to the LR04 record, the Fe/K profile resolves 100-kyr-like cycles around the 130 kyr frequency band in the interval from 1.25 to 2 million years. These 100-kyr-like cycles likely form by bundling of two or three obliquity cycles, indicating that low-latitude Indian-Asian climate variability reflects on increased tilt sensitivity to regional eccentricity insolation changes (pacing tilt cycles) prior to the MPT. The implication of appearance of the 100 kyr cycles in the LR04 and the Fe/K records since the MPT suggests strengthening of a climate link between the low and high latitudes during this period of climate transition.
    Keywords: Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP
    Type: Dataset
    Format: application/zip, 4 datasets
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