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  • 1
    Electronic Resource
    Electronic Resource
    Depositional environment of a Kimmeridgian carbonate ‘black band’ (Akkuyu Formation, south-western Turkey) (1999)
    Oxford UK : Blackwell Science Ltd
    Sedimentology 46 (1999), S. 0 
    Details
    ISSN: 1365-3091
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: The Upper Jurassic Akkuyu Formation of south-western Turkey consists of pale-coloured carbonate facies, but includes a peculiar ‘black band’ at its base. In order to characterize the depositional environment of this level, a sedimentological, organic and inorganic geochemical study was performed on 30 samples. Three units are distinguished. Unit 1 consists of black marlstones, very rich in organic carbon (22–30%) with HI (hydrogen index) values around 600. The organic matter is an amorphous homogeneous material even at nanoscopic scale. This unit is also characterized by a very high concentration of V ( 〉1000 p.p.m.) and a δ13Corg value around −26·5‰. Unit 2 shows thin-bedded black limestones with chert layers. Its organic content varies from 2% to 6%. As in unit 1, the HI values are uniformly high (600), and gas chromatography shows a high quantity of hopanes. The V concentration is also high (≈400 p.p.m.). The unit has a high Sr/Ca ratio, an organic carbon isotopic ratio close to −28·7‰ and diffuse, nanoscopically amorphous organic material that is closely associated with pyrite. Unit 3 corresponds to the white limestones overlying the ‘black band’. This calcitic facies is almost devoid of organic carbon (〈0·1%). The δ13Corg values are similar to those of unit 1 (−25·5‰ to −26‰). Deposition occurred in a basinal environment surrounded by a carbonate platform. Primary productivity was high but not exceptional; terrestrial organic inputs were scarce. Bottom waters were probably euxinic during the deposition of unit 1. The presence of both hopane-rich and sulphur-rich nanoscopically amorphous organic matter may be the result of strong sulphate-reducing bacterial activity. Coupled with low amounts of iron, this led to intense vulcanization of the organic matter and thus good preservation. With the onset of unit 2 deposition, environmental conditions became less extreme, perhaps because of cooler water temperatures. Finally, the depositional conditions became oxic, leading to the accumulation of pale-coloured organic-poor limestones of unit 3.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-3091.1999.00226.x
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    Paper (German National Licenses)
    Fulltext
  • 2
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    Astronomical duration of polarity Chron C31r (Lower Maastrichtian): cyclostratigraphy of ODP Site 762 (Indian Ocean) and the Contessa Highway section (Gubbio, Italy) (2012)
    Cambridge University Press
    Details
    Publication Date: 2012-03-01
    Description: The duration of polarity Chron C31r is estimated with a cyclostratigraphic approach. Two sites are investigated: ODP Site 762 (Indian Ocean) and the Contessa Highway section (Gubbio, Italy). Cyclostratigraphic analysis is performed on greyscale variations (Site 762) and magnetic susceptibility variations (Contessa section). Both sites reveal an astronomical control of the sedimentation, highlighted by the identification of all the orbital periodicities. Cyclostratigraphic signals are tuned on 405 ka eccentricity cycles extracted from the La04 astronomical solution. In both sites, cycle counting gives an estimate of the duration of polarity Chron C31r of about 2.09 ± 0.03 Ma.
    Print ISSN: 0016-7568
    Electronic ISSN: 1469-5081
    Topics: Geosciences
    Published by Cambridge University Press
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    PAPER CURRENT
  • 3
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    Susceptibility measurements at Gubbio sections (2014)
    PANGAEA
    In:  Supplement to: Husson, Dorothée; Galbrun, Bruno; Gardin, Silvia; Thibault, Nicolas (2014): Tempo and duration of short-term environmental perturbations across the Cretaceous-Paleogene boundary. Stratigraphy, 11(2), 159-171, https://inria.hal.science/ISTEP/hal-01092775v1
    Details
    Publication Date: 2023-04-22
    Description: The complex interplay between extraterrestrial events and earth-bound processes that triggered one of the greatest biological crises of the Phanerozoic requires a high resolution timescale. Detailed magnetic susceptibility measurements at the Contessa Highway and Bottaccione sections (Italy) span the Cretaceous-Paleogene boundary and reveal clear orbital signatures in the sedimentary record. Identification of precession and 405 kyr eccentricity cycles allows an estimate of 324+/-40 kyr for the duration of the Maastrichtian part of Chron C29r. We present in the same high resolution time frame sites in Spain and the North and South Atlantic and bio-horizons, biotic changes, stable isotopic excursions and the decrease in Osmium isotopes recorded in these sections. The onset of 187 Os/ 188 Os decrease coincides with the d13 C negative excursion K-PgE1, thus suggesting a first pulse in Deccan volcanism at 66.64 Ma. The K-PgE3 d13 C negative excursion is possibly the expression of a second pulse at 66.26 Ma. Late Maastrichtian d13 C negative excursions are of low intensity and span durations of one to two eccentricity cycles, whereas early Danian excursions are brief (about 30 kyr) and acute. In Biotic response to late Maastrichtian perturbations occurred with a delay of ca. 200 kyr after the beginning of K-PgE1 shortly before K-PgE3. The biotic perturbation could be thus either a delayed response to K-PgE1, or a direct response to K-PgE3, and possibly, a threshold response to the stepwise buildup of CO2 atmospheric injections. No delay is evident in response to early Danian hyperthermal events. These differences suggest that short-lived, volcanically-derived environmental perturbations were buffered within the stable late Maastrichtian oceanic realm whereas they were amplified by the more sensitive and highly disturbed early Danian oceanic ecosystem.
    Keywords: DEPTH, sediment/rock; GUB; Gubbio; Italy; Susceptibility, specific
    Type: Dataset
    Format: text/tab-separated-values, 263 data points
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  • 4
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    Magnetic susceptibility (MS) measurements on the Sancerre (France) drill-core (2013)
    PANGAEA
    In:  Supplement to: Boulila, Slah; Galbrun, Bruno; Huret, Emilia; Hinnov, Linda A; Rouget, Isabelle; Gardin, Silvia; Bartolini, Annachiara (2014): Astronomical calibration of the Toarcian Stage: Implications for sequence stratigraphy and duration of the early Toarcian oceanic anoxic event (OAE). Earth and Planetary Science Letters, 386, 98-111, https://doi.org/10.1016/j.epsl.2013.10.047
    Details
    Publication Date: 2023-02-07
    Description: The Toarcian Oceanic Anoxic Event (T-OAE) of the early Jurassic period involves one of the largest perturbations of the carbon cycle in the past 250 Ma, recorded by a pronounced negative carbon-isotope excursion (CIE). Numerous studies have focused on potential causes of the T-OAE and CIE, but are hampered by an uncertain timescale. Here we present high-resolution (~2 kyr) magnetic susceptibility (MS) measurements from the marine marls of the Sancerre-Couy drill-core, southern Paris Basin, spanning the entire Toarcian Stage. The MS variations document a rich series of sub-Milankovitch to Milankovitch frequencies (precession, obliquity and eccentricity) with the periodic g2-g5 (405 kyr) and quasi-periodic g4-g3 (~2.4 Myr Cenozoic mean periodicity) eccentricity terms being the most prominent. The MS-related g4-g3 variation reflects third-order eustatic sequences, and constrains the sequence stratigraphic framework of the Toarcian Stage. In addition, MS variations reveal a modulation of g2-g5 by g4-g3 eccentricity related cycles, suggesting that sea-level change was the main control on the deposition of the Toarcian Sancerre marls, in tune with the astro-climatic frequencies. The stable 405 kyr cyclicity constrains a minimum duration of the Toarcian Stage to ~8.3 Myr, and the well documented CIE, associated with the T-OAE, to ~300 to 500 kyr. The 405 kyr MS timescale calibrates the periodicity of the prominent high-frequency d13C cycles that occur in the decreasing part of the CIE to 30 to 34 kyr, consistent with the Toarcian obliquity period predicted for an Earth experiencing sustained tidal dissipation.
    Keywords: Bartington MS2E1 surface sanning sensor; DEPTH, sediment/rock; DRILL; Drilling/drill rig; Magnetic susceptibility, volume; Sancerre; Sancerre, Paris Basin, France
    Type: Dataset
    Format: text/tab-separated-values, 4880 data points
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    DATA PANGAEA
  • 5
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    Nannofossil events of Maastrichtian sediments from DSDP Hole 74-525A in the South Atlantic (Table 2)
    PANGAEA
    In:  Supplement to: Thibault, Nicolas; Gardin, Silvia (2007): The late Maastrichtian nannofossil record of climate change in the South Atlantic DSDP Hole 525A. Marine Micropaleontology, 65(3-4), 163-184, https://doi.org/10.1016/j.marmicro.2007.07.004
    Details
    Publication Date: 2023-06-27
    Description: The phytoplankton response (calcareous nannofossils) to the Late Maastrichtian climate evolution is investigated in the South Atlantic DSDP Hole 525A and compared to published geochemical and micropaleontological data. The results point to a succession of dramatic climatic fluctuations. “Cool-water indicators” (Ahmuellerella octoradiata, Kamptnerius magnificus and Nephrolithus frequens) suggest cool surface water conditions prevailed during Chron C30n. At the top of C30n, their sudden drop in abundance, the last occurrence of B. constans and the concomitant increase in the tropical species Micula murus suggest warming and lower surface water productivity. An M. murus acme within Chron C29r reflects maximum warming. During the last 100 kyr of the Maastrichtian, the decrease in M. murus and increase in cool-water indicators reflect rapid cooling with the cool climate persisting over. The calcareous nannoplankton response to climate change correlate with similar findings in the Equatorial Atlantic Hole 1258A and parallels the stable isotope record of planktic and benthic foraminifera of DSDP Hole 525A as well as the decline in 187Os/188Os. Comparison of this marine record and the continental climate record in North America suggests a link between Deccan volcanism and the late Maastrichtian warm event.
    Keywords: 74-525A; Ageprofile Datum Description; Deep Sea Drilling Project; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP; Glomar Challenger; Leg74; South Atlantic/CREST
    Type: Dataset
    Format: text/tab-separated-values, 6 data points
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    DATA PANGAEA
  • 6
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    (Appendix A) Nannofossil stratigraphic range chart for the late Maastrichtian section of DSDP Hole 86-577A (2010)
    PANGAEA
    In:  Supplement to: Thibault, Nicolas; Gardin, Silvia (2010): The calcareous nannofossil response to the end-Cretaceous warm event in the Tropical Pacific. Palaeogeography, Palaeoclimatology, Palaeoecology, 291(3-4), 239-252, https://doi.org/10.1016/j.palaeo.2010.02.036
    Details
    Publication Date: 2023-11-22
    Description: The response of calcareous nannofossils to the end-Cretaceous warming is investigated in the Tropical Pacific DSDP Site 577A (Shatsky Rise) through the record of species richness, Shannon diversity, distribution patterns and statistical treatments. This event is marked by a strong acme of the tropical species Micula murus and is accompanied by a decrease of Placozygus spiralis, the disappearance of Biscutum constans and a decrease in bulk d13C, indicative of a decrease in primary productivity. An increase in abundance of other Micula species at Site 577A and a drop in species richness recorded in all sites of Shatsky Rise, suggest stressed environmental conditions coincident with the end-Cretaceous warming. The acme of M. murus at Shatsky Rise and in the Atlantic Ocean is recorded within magnetochron C29r and correlates (1) with the intense warming as expressed in intermediate waters through the ?18O of benthic foraminifera, and in surface waters through poleward migration, reduced diversity and dwarfism in planktonic foraminifer assemblages, (2) with a sharp decline in marine 187Os/188Os, chemical marker of Deccan volcanic activity, and (3) with a rise in the atmospheric pCO2 record of terrestrial plants in Texas, USA, probably triggered by Deccan volcanic degassing. However, a drop of calcareous nannofossil cool-water taxa in the Equatorial and South Atlantic, as well as a first rise in abundance of M. murus in the South Atlantic and Tropical Pacific occur in the topmost part of chron C30n, and correlates with the rise in palaeotemperature record of terrestrial plants in North Dakota, USA. This suggests that initiation of the warming in the atmosphere and surface waters may predate the striking warming of intermediate water masses by 150/200 kyr. The coincidence and the links between climate change, volcanism, geochemical and biotic events at the end of the Maastrichtian thus remain to be fully elucidated.
    Keywords: 86-577A; Ageprofile Datum Description; Ahmuellerella regularis; Arkhangelskiella cymbiformis; Biscutum constans; Biscutum sp.; Broinsonia signata; Bukrylithus cf. ambiguus; Ceratolithoides amplector; Ceratolithoides arcuatus; Ceratolithoides indiensis; Ceratolithoides kamptneri; Ceratolithoides longissimus; Ceratolithoides pricei; Ceratolithoides quasiarcuatus; Ceratolithoides self-trailiae; Ceratolithoides ultimus; Chiastozygus cf. antiquus; Chiastozygus litterarius; Corollithion madagaskarensis; Cretarhabdus cf. multicavus; Cretarhabdus conicus; Cribrocorona gallica; Cribrosphaerella circula; Cribrosphaerella ehrenbergii; Cyclagelosphaera margerelii; Cylindralithus nieliae; Cylindralithus nudus; Cylindralithus sculptus; Cylindralithus serratus; Deep Sea Drilling Project; Depth, relative; DEPTH, sediment/rock; Discorhabdus ignotus; DRILL; Drilling/drill rig; DSDP; Eiffellithus gorkae; Eiffellithus parallelus; Eiffellithus turriseiffelii; Glomar Challenger; Helicolithus anceps; Helicolithus trabeculatus; Holococcolith sp.; Lapideacassis cornuta; Leg86; Lithraphidites carniolensis; Lithraphidites praequadratus; Lithraphidites quadratus; Loxolithus armilla; Loxolithus sp.; Loxolithus thiersteinii; Manivitella pemmatoidea; Microrhabdulus decoratus; Microrhabdulus undosus; Micula concava; Micula cubiformis; Micula decussata; Micula murus; Micula prinsii; Micula sp.; Micula swastica; Nannofossils; Nannofossil zone; North Pacific; Perchnielsenella stradneri; Placozygus spiralis; Prediscosphaera cretacea; Prediscosphaera grandis; Prediscosphaera majungae; Prediscosphaera microrhabdulina; Prediscosphaera spinosa; Prediscosphaera stoveri; Pseudomicula quadrata; Quadrum gartneri; Quadrum sp.; Retecapsa angustiforata; Retecapsa crenulata; Retecapsa ficula; Retecapsa schizobrachiata; Retecapsa surirella; Rhagodiscus angustus; Rhagodiscus indistinctus; Rhagodiscus plebeius; Rhagodiscus reniformis; Rhagodiscus splendens; Rotelapillus biarcus; Rotelapillus crenulatus; Russelia bukryi; Sample code/label; Semihololithus priscus; Species richness; Staurolithites laffittei; Staurolithites mielnicensis; Stoverius sp.; Tegumentum stradneri; Tetrapodorhabdus decorus; Thoracosphaera operculata; Tranolithus minimus; Watznaueria barnesiae; Watznaueria biporta; Watznaueria manivitiae; Watznaueria quadriradiata; Zeugrhabdotus cf. erectus; Zeugrhabdotus embergeri; Zeugrhabdotus praesigmoides; Zeugrhabdotus sigmoides; Zeugrhabdotus sp.
    Type: Dataset
    Format: text/tab-separated-values, 1925 data points
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  • 7
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    Stratigraphy of the Campanian-Maastrichtian boundary in ODP Hole 122-762C (2012)
    PANGAEA
    In:  Supplement to: Thibault, Nicolas; Husson, Dorothée; Harlou, Rikke; Gardin, Silvia; Galbrun, Bruno; Huret, Emilia; Minoletti, Fabrice (2012): Astronomical calibration of upper Campanian–Maastrichtian carbon isotope events and calcareous plankton biostratigraphy in the Indian Ocean (ODP Hole 762C): Implication for the age of the Campanian–Maastrichtian boundary. Palaeogeography, Palaeoclimatology, Palaeoecology, 337-338, 52-71, https://doi.org/10.1016/j.palaeo.2012.03.027
    Details
    Publication Date: 2024-01-09
    Description: An integrated framework of magnetostratigraphy, calcareous microfossil bio-events, cyclostratigraphy and d13C stratigraphy is established for the upper Campanian-Maastrichtian of ODP Hole 762C (Exmouth Plateau, Northwestern Australian margin). Bulk-carbonate d13C events and nannofossil bio-events have been recorded and plotted against magnetostratigraphy, and provided absolute ages using the results of the cyclostratigraphic study and the recent astronomical calibration of the Maastrichtian. Thirteen carbon-isotope events and 40 nannofossil bio-events are recognized and calibrated with cyclostratigraphy, as well as 14 previously published foraminifer events, thus constituting a solid basis for large-scale correlations. Results show that this site is characterized by a nearly continuous sedimentation from the upper Campanian to the K-Pg boundary, except for a 500 kyr gap in magnetochron C31n. Correlation of the age-calibrated d13C profile of ODP Hole 762C to the d13C profile of the Tercis les Bains section, Global Stratotype Section and Point of the Campanian-Maastrichtian boundary (CMB), allowed a precise recognition and dating of this stage boundary at 72.15 ± 0.05 Ma. This accounts for a total duration of 6.15 ± 0.05 Ma for the Maastrichtian stage. Correlation of the boundary level with northwest Germany shows that the CMB as defined at the GSSP is ~800 kyr younger than the CMB as defined by Belemnite zonation in the Boreal realm. ODP Hole 762C is the first section to bear at the same time an excellent recovery of sediments throughout the upper Campanian-Maastrichtian, a precise and well-defined magnetostratigraphy, a high-resolution record of carbon isotope events and calcareous plankton biostratigraphy, and a cyclostratigraphic study tied to the La2010a astronomical solution. This section is thus proposed as an excellent reference for the upper Campanian-Maastrichtian in the Indian Ocean.
    Keywords: 122-762C; DRILL; Drilling/drill rig; Joides Resolution; Leg122; Ocean Drilling Program; ODP; South Indian Ridge, South Indian Ocean
    Type: Dataset
    Format: application/zip, 8 datasets
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    DATA PANGAEA
  • 8
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    (Table 1) Campanian-Maastrichtian bioevents of ODP Hole 122-762C (2012)
    PANGAEA
    Details
    Publication Date: 2024-01-09
    Keywords: 122-762C; Age, error; Age model; Ageprofile Datum Description; Depth, adjusted bottom; Depth, adjusted top; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; DRILL; Drilling/drill rig; Joides Resolution; Leg122; Ocean Drilling Program; ODP; Reference/source; South Indian Ridge, South Indian Ocean
    Type: Dataset
    Format: text/tab-separated-values, 421 data points
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    DATA PANGAEA
  • 9
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    (Table 2a) Campanian-Maastrichtian magnetochrons of ODP Hole 122-762C (2012)
    PANGAEA
    Details
    Publication Date: 2024-01-09
    Keywords: 122-762C; Age, error; Age model; Age model, optional; Ageprofile Datum Description; Depth, adjusted; DEPTH, sediment/rock; DRILL; Drilling/drill rig; Error, absolute; Joides Resolution; Leg122; Ocean Drilling Program; ODP; Site; South Indian Ridge, South Indian Ocean
    Type: Dataset
    Format: text/tab-separated-values, 83 data points
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  • 10
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    (Table 3) Description of carbon-isotope events in Campanian-Maastrichtian sediments of ODP Hole 122-762C (2012)
    PANGAEA
    Details
    Publication Date: 2024-01-09
    Keywords: 122-762C; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Description; DRILL; Drilling/drill rig; Isotopic event; Joides Resolution; Leg122; Ocean Drilling Program; ODP; South Indian Ridge, South Indian Ocean; Stage
    Type: Dataset
    Format: text/tab-separated-values, 75 data points
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