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Steptoean Positive Carbon Isotope ExcursionStratigraphyMajor positive carbon isotopeCarbonateGeochemistryBoundaryOxygenEarth'sStableLacustrineCoincidentToarcianChemostratigraphySedimentsOnsetEvidenceDioxideNegativeShiftOceanic AnoxiTerrestrialFractionationClimaticPositivePalynologicalBlack ShaleBurialRatiosGeologicalClimateMethaneAtmosphericOccurs
Steptoean Positive Carbon Isotope Excursion2
  • The Steptoean Positive Carbon Isotope Excursion (SPICE) was a geological event which occurred about 495 million years ago near the beginning of the International Furongian Epoch of the Cambrian Period. (wikipedia.org)
  • It records two post-SPICE events (SPICE - Steptoean Positive Carbon Isotope Excursion) marked by negative δ¹³Ccarb excursions (NL1 and NL2) that were also documented in South China. (mun.ca)
Stratigraphy3
  • Carbon isotope stratigraphy of the St. Clair from an outcrop near Dongola Hollow and from the Schlamer #1 core, both located in Alexander County, Illinois, reveals the presence of the Ireviken (early Sheinwoodian) and Mulde (middle to upper Homerian) carbon isotope excursions. (confex.com)
  • We improve this resolution through high-resolution stratigraphy across the P/Tr boundary in the 331-m Gartnerkofel-1 core and nearby Reppwand outcrop section (Carnic Alps, Austria) utilizing FFT and wavelet timeseries analyses of cyclic components in down-hole core logs of density and natural gamma-ray intensity, and carbon-isotopic ratios of bulk samples. (nasa.gov)
  • These sedimentological changes, in combination with carbon isotope stratigraphy, provide the first evidence for storm intensification during the T-OAE interval from the mid latitude Panthalassic margin. (atlas.jp)
Major positive carbon isotope1
  • The Mid Cretaceous Aptian had two major positive carbon isotope excursions followed by negative carbon excursions that were recorded in marine and terrestrial organic matter. (smu.ca)
Carbonate4
  • Carbon isotope record of the Early Jurassic (Toarcian) Oceanic Anoxic Event from fossil wood and marine carbonate (Lusitanian Basin, Portugal). (palass.org)
  • This includes sedimentological and biological reconstructions of palaeo-environments, theoretical or experimental studies of trace element partitioning and isotope fractionation in carbonate (bio)minerals, and studies targeting original skeletal carbonate preservation and diagenetic alteration. (copernicus.org)
  • The carbonate-silicate geochemical cycle and its effect on atmospheric carbon dioxide over the past 100 million years. (iodp.org)
  • Applying novel metal isotopes(Mg-Ca-U) in paleo-ocean chemistry and carbonate diagenesis studies. (cas.cn)
Geochemistry1
  • His work is dedicated to discovering how Permian, Geochemistry are connected with Dissolved organic carbon and Isotopes of carbon and other disciplines. (research.com)
Boundary6
  • Carbon isotope and palynological analysis of the fine-grained organic carbon-rich lacustrine sediments that filled the Cretaceous-Paleogene (K-Pg) boundary-age Boltysh impact crater (Ukraine) preserve a uniquely complete and detailed record of a negative carbon isotope excursion in an expanded section of the early Danian that we estimate lasted as long as ∼340 k.y. (geoscienceworld.org)
  • This framework is also consistent with the position of the Triassic-Jurassic boundary interval (placed at Italcementi Quarry at the acme of Kraeuselisporites reissingeri coincident with a negative carbon isotope excursion) correlative to just above Newark magnetozone E23r and just below the oldest CAMP lavas dated at ~ 202 Ma. (blogspot.com)
  • Hence, we estimate the duration of the Rhaetian to be ~ 5.5-8.5 Myr (or even longer if the Triassic-Jurassic boundary is instead placed above the negative carbon isotope excursion as at Kuhjoch, which is the designated GSSP for the base of the Hettangian), and encompassing 9 magnetozones. (blogspot.com)
  • The maximum carbon isotope excursion is near this boundary, which therefore approximates the IOB in the Dolomites. (unife.it)
  • It records the HERB event (HERB - Hellnmaria-Red Tops Boundary) marked by a negative δ¹³Ccarb excursion at the base of the Econodontus notchpakensis conodont Zone. (mun.ca)
  • A dramatic global sea level change and carbon isotope positive excursion at the Early/Middle Triassic boundary both indicate stressful environmental changes that may have triggered this evolutionary jump. (copernicus.org)
Oxygen7
  • The Cenozoic Era is characterized by a long-term (~10^6 to 10^7 year) global cooling trend from the early Paleogene ice-free "greenhouse" conditions towards the Neogene "ice-house" regime, as inferred based on the globally compiled deep-sea benthic foraminiferal oxygen stable isotope records. (google.com)
  • Globally compiled deep-sea benthic foraminiferal oxygen stable isotope records (adopted from Zachos et al. (google.com)
  • Of the three Cenozoic benthic foraminiferal oxygen isotope events pointed above, the middle Miocene positive shift of ~0.9‰ between ca. 14.5 and 12.7 Ma is generally interpreted to indicate major expansion and permanent establishment of the East Antarctic ice sheet (EAIS) accompanied by some effect of deepwater cooling. (google.com)
  • Before the middle-late Miocene EAIS/cooling shift, the benthic foraminiferal oxygen isotope record shows a brief but distinct negative excursion in the early middle Miocene that represents the most depleted values of the entire Neogene. (google.com)
  • Paleoclimate reconstructions based on paleontological records from onshore sections around the circum-Pacific margin reasonably well correspond to the Miocene deepwater oxygen isotope trends. (google.com)
  • These early middle Miocene "warm" molluscan faunas in the North Pacific are replace by a relatively "cool" faunas, the timing of which likely corresponds to the deepwater EAIS/cooling oxygen isotope positive shift. (google.com)
  • Furthermore, the subsequent retreat of the "warm" molluscan faunas in the North Pacific and the worldwide benthic foraminiferal oxygen isotope positive shift after the MMCO require an effective decrease in the poleward heat transport and reorganization of the global thermal budget. (google.com)
Earth's3
Stable2
  • In: Michener, R. & Lajtha, K. (eds), Stable isotope s in Ecology and Environmental Science. (sepmstrata.org)
  • The stable isotope data presented here significantly extend and expand upon previous isotopic investigations of the Middle to Late Jurassic interval. (figshare.com)
Lacustrine1
  • Structure of the carbon isotope excursion in a high-resolution lacustrine Paleocene-Eocene Thermal Maximum record from central China. (cas.cn)
Coincident3
  • 13 Ccarb excursion and that peak values of the Hangenberg excursion in Missouri are not coincident with and cannot be accounted for by high Corg burial in epeiric seas. (usgs.gov)
  • However, the processes and events preceding widespread carbon burial coincident with oceanic anoxic events remain poorly constrained. (nature.com)
  • Overall, a decrease in diversity and evenness is observed through the section, recording a relapse of recovery coincident with negative δ 13 C carb excursions indicating pulses of volcanic outgassing. (confex.com)
Toarcian2
  • The Late Palaeocene - Early Eocene and Toarcian (Early Jurassic) carbon isotope excursions: a comparison of their time scales, associated environmental changes, causes and consequences. (palass.org)
  • Paired bio- and chemostratigraphies show that Lagerstätte deposition occurred during the late Pliensbachian through early Toarcian, capturing the carbon isotope excursion associated with the Toarcian Oceanic Anoxic Event. (geoscienceworld.org)
Chemostratigraphy2
  • First, we established a high-resolution carbon-isotope chemostratigraphy. (atlas.jp)
  • The various areas that Zhong-Qiang Chen examines in his Early Triassic study include Chemostratigraphy, Isotopes of carbon, Extinction, Sulfur cycle and Conodont. (research.com)
Sediments1
  • Increased rates of organic carbon were buried in marine sediments at the height of the mid-Cretaceous greenhouse (Voigt et al. (springeropen.com)
Onset2
  • The base of the Wenlock is slightly below the onset of the Ireviken excursion and therefore falls in the Seventy-Six Shale. (confex.com)
  • The major biofacies shift, which occurred in the Cili section in the upper part of the Microzarkodina ozarkodella Zone, at the time of the onset and initial rise of the Mid Darriwilian Carbon Isotope Excursion (MDICE) suggests that these biofacies may have been depth controlled. (palass.org)
Evidence4
  • Yet direct evidence of heightened primary productivity, a mechanism producing progressive deoxygenation via organic carbon remineralization, prior to OAE-2 is lacking. (nature.com)
  • In particular, we note evidence for mudstone deposition by bottom currents, and silty mudstones exhibiting evidence of energetic conditions are concentrated during the carbon-isotope negative excursion interval. (atlas.jp)
  • Strontium isotope evidence for a highly mobile population on the Pamir Plateau 2500 years ago. (cas.cn)
  • Early Eocene carbon isotope excursions: Evidence from the terrestrial coal seam in the Fushun Basin, Northeast China. (cas.cn)
Dioxide6
Negative10
  • Negative excursions at the bottom of the section (-3.6 ‰) and at the top (-2.8 ‰ and -3.2 ‰) help constrain the Dinwoody at Blacktail Creek to lower Griesbachian through lower Dienerian. (confex.com)
  • The observed relapse in recovery associated with these negative carbon isotope excursions lends support to the hypothesis that continued Siberian Traps outgassing stalled recovery in some regions, specifically in shallower settings susceptible to temperature spikes and associated climate change. (confex.com)
  • The sharp negative global carbon-isotope shift took place within less than or equal to 40,000 yr, and the isotope excursions persisted for approximately 480,000 yr into the Early Triassic. (nasa.gov)
  • The Palaeocene-Eocene thermal maximum is a global warming period (∼56 Ma), which is marked by a sharp negative carbon isotope excursion (CIE) that caused by the injection of massive isotopically-light carbon into the ocean-atmosphere. (whiterose.ac.uk)
  • Authigenic origin for a massive negative carbon isotope excursion. (cas.cn)
  • This event is characterized by the widespread occurrence of a ~3-7‰ negative excursion in the carbon-isotope (δ 13 C) composition of marine organic and inorganic matter and terrestrial plant material. (atlas.jp)
  • As a result, the characteristic T-OAE negative δ 13 C excursion was recognized around the middle part of the Nishinakayama Formation, making accurate international correlation possible. (atlas.jp)
  • The Mid-Oxfordian negative carbon isotope excursions identified in published Tethyan records and commonly attributed to methane release are not recorded in the Staffin Bay data, which may suggest that the Tethyan excursions do not represent fluctuations in the global carbon reservoir and that the fidelity of the methane hypothesis should be re-evaluated. (figshare.com)
  • A similar scenario seems to be consistent with NL1 (lower negative δ¹³Ccarb excursion) although the lower resolution of correlated proxy variations makes the interpretations based on a few points and to be therefore taken with caution. (mun.ca)
  • However, the TOC profile shows a small gradual enrichment (~1 %), above the peak of the excursion, correlated with a broad negative δ¹³Corg shift (~2 ‰), and a positive Al/Ti shift. (mun.ca)
Shift2
  • This shift during SPICE is interpreted to be a global disturbance in the carbon cycle, affecting the atmosphere and the oceans in equal proportion as described by Henry's law. (wikipedia.org)
  • We show a shift from climate-warming driving carbon-emission scenario to a scheme in which carbon-injection causing global-warming during the CIE. (whiterose.ac.uk)
Oceanic Anoxi1
  • These findings highlight how organic carbon burial drivers operated along a continuum in concert with microbial ecological changes, with antecedent, localized increases in primary production destabilizing carbon cycling and promoting the progressive marine deoxygenation leading to Oceanic Anoxic Event 2. (nature.com)
Terrestrial1
  • The correspondence between the marine and terrestrial records indicates a strong coupling of the ocean-atmosphere system and suggests that the total exchangeable carbon reservoir would have been affected at this time. (figshare.com)
Fractionation1
  • Hayes, J.M. Strauss, H., Kaufman, A.J., 1999, The abundance of 13 C in marine organic matter and isotopic fractionation in the global biogeochemical cycle of carbon during the past 800 Ma. (sepmstrata.org)
Climatic1
  • The time equivalence between initial reef growth and the Guttenberg isotope carbon excursion (GICE) suggests that global climatic conditions were important. (lu.se)
Positive3
  • The Staffin Bay data reveal a broad Early to Mid-Oxfordian positive carbon isotope excursion. (figshare.com)
  • Could Proterozoic Positive Carbon Isotope Excursions be Tracking Intense Methane Fluxes to the Atmosphere? (goldschmidtabstracts.info)
  • Recent chemostratigraphic studies have permitted the recognition of some carbon isotope positive peaks, the strongest of which is considered to approximate the IOB. (unife.it)
Palynological2
  • Figure S1: Stratigraphic log with the positions of the samples collected for isotope and palynological analyses at the Dacao "A," Dacao "B," and Liangshuijing sections. (figshare.com)
  • Palynological assemblages recovered through the excursion reflect the increasing dominance of thermophylic Normapolles species, indicating an increasingly warm and dry climate, while those recovered below and above the excursion reflect a cooler and wetter climate. (geoscienceworld.org)
Black Shale1
  • High temperatures, high weathering rates and unusual ocean circulation characterized this time period, resulting in preservation of organic carbon in sediment and the formation of black shale sequences. (smu.ca)
Burial2
  • An increase of δ13C such as during SPICE is rather interpreted as the result of increased carbon fixation primarily by plants, which fix 12C more readily than 13C, and the subsequent burial of this organic carbon in sedimentary rocks. (wikipedia.org)
  • One proposed cause of the SPICE is an increase in the burial of organic carbon, perhaps caused by increased primary productivity (e.g. photosynthesis) or enhanced organic matter preservation due to ocean deoxygenation (i.e. anoxia or euxinia). (wikipedia.org)
Ratios1
  • Based on the results from chemical analyses of these samples, the researchers identified multiple excursions in carbon isotope ratios, a clear indication of the Eocene hyperthermals. (u-tokyo.ac.jp)
Geological1
  • Using data on carbon isotope excursions, large igneous provinces and impact craters, we identify three time zones of high geological activity which relate to the timings of the passage of the Solar System through the spiral arms. (open.ac.uk)
Climate2
  • 13Ccarb excursion, as a result of a change in the site of deep water formation to low-latitude epeiric seas as the global climate shifted between cold and warm states. (usgs.gov)
  • Variations in the global carbon cycle during the Cretaceous related to climate, volcanism, and changes in atmospheric CO 2 . (iodp.org)
Methane1
  • The initial carbon emission might be from methane hydrates dissociation and/or permafrost thawing, possibly linked with astronomical paced warming. (whiterose.ac.uk)
Atmospheric1
  • A rise in the atmospheric δ13C ratio doesn't necessarily infer a rise in abolute atmospheric carbon concentration. (wikipedia.org)
Occurs2
  • Carbon 14 only occurs in tiny traces - about one atom per gram of carbon is a ballpark figure. (skepticalscience.com)
  • The excursion maximum occurs in the cordatum Zone (British Boreal ammonite zonation), although high values persist into the tenuiserratum Zone. (figshare.com)