Noble Metals in Cretaceous/Tertiary Sediments from El Kef

Kuslys, M.; Kraehenbuehl, U.

doi:10.1524/ract.1983.34.3.139

Cited by 15 publications

(4 citation statements)

References 10 publications

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“…7). An iridium anomaly (Kuslys and Krähenbühl, 1983) is also present at the base of the boundary clay and correlative with the isotope and nannofossil changes. Cretaceous nannofossil abundance remains low in the 3-m interval above the boundary, but survivors plus Tertiary forms show variably fluctuating peaks.…”

Section: Nannofossil Abundance Isotopes and Productivitymentioning

confidence: 67%

Calcareous nannoplankton mass extinction at the Cretaceous/Tertiary boundary: An update

Pospichal¹

1996

The Cretaceous-Tertiary Event and Other Catastrophes in Earth History

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Section: Nannofossil Abundance Isotopes and Productivitymentioning

confidence: 67%

Calcareous nannoplankton mass extinction at the Cretaceous/Tertiary boundary: An update

Pospichal¹

1996

The Cretaceous-Tertiary Event and Other Catastrophes in Earth History

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“…), which is concentrated in the basal part of the Boundary Clay (see above). Robin et al (1991) and Rocchia and Robin (1998) con!rmed the high concentrations of iridium and other PGEs in K/Pg boundary sediments at the El Kef GSSP, already described by Kuslys and Krähenbühl (1983). Although delivered by a very brief event, Ir is observed over a sizeable thickness of sediments simulating a long duration phenomenon.…”

Section: Studies Since the Original Proposalmentioning

confidence: 71%

“…According to the same author, it contains less than 1% CaCO 3 , and a maximum in TOC (Total Organic Carbon). Kuslys and Krähenbühl (1983) found enrichments in Ir and Os and depleted La, Eu, Yb and Lu. The maximun Ir content of 16.25 ppb is restricted to the rusty layer of the basal Boundary Clay.…”

Section: Geographical Location and Geologymentioning

confidence: 93%

The Global Boundary Stratotype Section and Point for the base of the Danian Stage (Paleocene, Paleogene, Tertiary, Cenozoic) at El Kef, Tunisia — Original definition and revision

Molina¹,

Alegret²,

Arenillas³

et al. 2006

Episodes

204

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The Cretaceous/Paleogene (K/Pg) Working Group, after many years of studies, voted to define the Global Stratotype Section and Point (GSSP) for the base of the Danian Stage at the base of the boundary clay at a section near El Kef, Tunisia. The GSSP was approved by the International Commission on Stratigraphy (ICS) and ratified by the International Union of Geological Sciences (IUGS) in 1991. Nevertheless, the GSSP was not officially published, although some papers dealing with geological aspects of the K/Pg boundary at El Kef have been published and this is quite well known. In April 2006, the GSSP was revisited, a marker was put in place and protection of the site was requested. Many correlation criteria are present at the GSSP of which the most useful are the meteorite impact evidence (iridium anomaly, Ni-rich spinel, etc.) and the mass extinction of planktic micro-and nannofossils. This event coincides with the GSSP, allowing us to propose that the K/Pg boundary is marked exactly by the moment of the meteorite impact, which implies that all the sediments generated by the impact belong to the Danian. This definition solves problems of correlation in the Yucatan peninsula (Mexico) and its surroundings.

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“…, 1980; Smit & ten Kate, 1982); Stevens Klint (Kyte et al. , 1985); El Kef (Kuslys & Krähenbühl, 1983; Meyer et al. , 1993; for the interval 0 – 1cm; Rocchia & Robin, 1998).…”

Section: Resultsmentioning

confidence: 99%

The environmental disaster of Aznalcóllar (southern Spain) as an approach to the Cretaceous–Palaeogene mass extinction event

Rodrı́guez-Tovar

Martín-Peinado

2009

Geobiology

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Biotic recovery after the Cretaceous-Palaeogene (K-Pg) impact is one unsolved question concerning this mass extinction event. To evaluate the incidence of the K-Pg event on biota, and the subsequent recovery, a recent environmental disaster has been analysed. Areas affected by the contamination disaster of Aználcollar (province of Sevilla, southern Spain) in April 1998 were studied and compared with the K-Pg event. Several similarities (the sudden impact, the high levels of toxic components, especially in the upper thin lamina and the incidence on biota) and differences (the time of recovery and the geographical extension) are recognized. An in-depth geochemical analysis of the soils reveals their acidity (between 1.83 and 2.11) and the high concentration of pollutant elements, locally higher than in the K-Pg boundary layer: values up to 7.0 mg kg(-1) for Hg, 2030.7 mg kg(-1) for As, 8629.0 mg kg(-1) for Pb, 86.8 mg kg(-1) for Tl, 1040.7 mg kg(-1) for Sb and 93.3-492.7 p.p.b. for Ir. However, less than 10 years after the phenomenon, a rapid initial recovery in biota colonizing the contaminated, 'unfavourable', substrate is registered. Nesting of the ant Tapinoma nigerrima (Nylander) has taken place through the tailing layer, with arranged particles from inside the soils showing similar values in pollutant elements as the deep soils. This agrees with recent ichnological evidence of a rapid colonization of the K-Pg boundary layer, classically interpreted as an inhabitable substrate, by organisms with a high independence with respect to substrate features (i.e. Chondrites trace makers). The dramatic consequences of the K-Pg boundary impact and the generalized long-time recovery interpreted after the event (in the order of 10(4)-10(5) years) could have been overestimated due to the absence of a high-temporal resolution in the range of 10(2)-10(3) years.

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Noble Metals in Cretaceous/Tertiary Sediments from El Kef

Cited by 15 publications

References 10 publications

Calcareous nannoplankton mass extinction at the Cretaceous/Tertiary boundary: An update

Calcareous nannoplankton mass extinction at the Cretaceous/Tertiary boundary: An update

The Global Boundary Stratotype Section and Point for the base of the Danian Stage (Paleocene, Paleogene, Tertiary, Cenozoic) at El Kef, Tunisia — Original definition and revision

The environmental disaster of Aznalcóllar (southern Spain) as an approach to the Cretaceous–Palaeogene mass extinction event

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Noble Metals in Cretaceous/Tertiary Sediments from El Kef

Cited by 15 publications

References 10 publications

Calcareous nannoplankton mass extinction at the Cretaceous/Tertiary boundary: An update

Calcareous nannoplankton mass extinction at the Cretaceous/Tertiary boundary: An update

The Global Boundary Stratotype Section and Point for the base of the Danian Stage (Paleocene, Paleogene, Tertiary, Cenozoic) at El Kef, Tunisia — Original definition and revision

The environmental disaster of Aznalcóllar (southern Spain) as an approach to the Cretaceous–Palaeogene mass extinction event

Contact Info

Product

Resources

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The Global Boundary Stratotype Section and Point for the base of the Danian Stage (Paleocene, Paleogene, Tertiary, Cenozoic) at El Kef, Tunisia — Original definition and revision