Experimental evidence for the global acidification of surface ocean at the Cretaceous–Palaeogene boundary: the biogenic calcite-poor spherule layers

Premović, Pavle

doi:10.1017/s1473550409990139

Cited by 6 publications

(6 citation statements)

References 128 publications

(240 reference statements)

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“…(), but opposed by others (Bohor and Betterton ; Bohor ). The amount of biogenic calcite is less than 20 per cent in the impact layer, increasing to over 60 per cent in the upper part of the Fiskeler (Premović ). The impact layer also includes clasts of granite, small quart grains and biotite, presumably originating from the nearby southern Scandia peneplain (J. S. Adolfssen pers.…”

Section: Geological Settingmentioning

confidence: 99%

Crossing the boundary: an elasmobranch fauna from Stevns Klint, Denmark

Adolfssen

Ward

2013

Palaeontology

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The chondrichthyan faunas from the Danish Maastrichtian chalk and the K/T boundary clay, the Fiskeler, are described for the first time. The rich and diverse fauna discovered in the late Maastrichtian chalk experienced a massive drop in diversity prior to the boundary. However, the fauna started to recover immediately after the deposition of the impact layer during earliest Danian times and had regained much of its diversity during the first few millennia after the bolide impact. Precision sampling has made it possible to document the recovery of the fauna, which did not suffer an extinction event of the same magnitude, as apparently observed in Morocco. At Stevns Klint, only 33 per cent of the chondrichthyan fauna became extinct compared with the 96 per cent in Morocco. The drop in diversity before the boundary is attributed to a sudden change in sea level. Among the sharks found in the chalk and Fiskeler are rare species such as Parasquatina and Echinorhinus and the first representative of Nebrius in Europe.

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Section: Geological Settingmentioning

confidence: 99%

Crossing the boundary: an elasmobranch fauna from Stevns Klint, Denmark

Adolfssen

Ward

2013

Palaeontology

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“…An estimation from the experimental data of Schmitz [22] and Smit [23] that the surface density of As (on a carbonate-free basis) of RLC, RLA and RLW is, respectfully, about 540 µg cm -2 , 360 µg cm -2 and 480 µg cm -2 , Table 1; by comparison, as noted above the mean global surface density As of the ejecta layer at marine sites is about 179 µg cm -2 . The deposition of RLC and RLA (about 3 mm thick) occurred for several decades up to a century at most [5,6]. The same is probably true for the depositional duration of RLW (ca.…”

Section: Introductionmentioning

confidence: 80%

“…Assuming that the deposition of the boundary ejecta layers in Spain and N. Zealand occurred for 100 years [5,6] than about 1000 -10,000 km 3 of the basaltic lava could have been discharged. If 0.3 % of As in this lava was released into the lower stratosphere and dispersed over the entire Earth this would yield only about 1 -10 ng cm -2 .…”

Section: Volume 55mentioning

confidence: 99%

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Cretaceous-Paleogene Boundary Clays from Spain and New Zealand: Arsenic Anomaly and the Deccan Traps

Premović

2016

ILNS

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Abstract. High arsenic (As) contents have been reported in numerous Cretaceous-Paleogene boundary (KPB) clays worldwide including those from Spain (at Caravaca and Agost) and N. Zealand (at Woodside Creek). The Deccan Traps (India) enormous volcanism is one of the interpretations which have been offered to explain this anomaly. This report shows that the estimated surface densities of As in the boundary clays in Spain and New Zealand strongly contradict that anomalous As was sourced by this volcanic event.

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“…Most of the boundary clays at distal marine sites (more than about 9000 km from Chicxulub) are characterized by a basal (2-4 mm thick) redish layer (the so called ejecta layer) marking the KPB [6,7]. This layer contains most of the Ir and other impact-related markers.…”

Section: Iridiummentioning

confidence: 99%

Cretaceous-Paleogene Boundary Clays from Spainand New Zealand: Arsenic Anomalies

Premović

2015

Open Geosciences

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Remarkably high arsenic (As) contents have been reported in numerous Cretaceous-Paleogene boundary (KPB) clays worldwide including those from Spain (at Caravaca and Agost) and New (N.) Zealand (at Woodside Creek). Two interpretations have been offered to explain this anomaly. The first one suggests that this As was generated by the combustion of fossil fuels (such as crude oil, coal or oil shales) near the Chicxulub impact site and the second interpretation proposes the post-impact combustion of the global biomass at the KPB. Both types of combustion were presumably triggered by the Chicxulub impactor. This report shows that the estimated surface densities of As in Spain and N. Zealand strongly contradict the fossil fuel hydrocarbons/biomass hypotheses. In addition, we also show that previously reported global abundances of As at KPB are greatly overestimated. The high abundances of iron (Fe) in the ejecta layers from Spain and N. Zealand lead us to a working hypothesis that a major fraction of their anomalous As was adsorbed from seawater by the Fe-oxides. These oxides were mainly derived of Fe from the vaporized carbonaceous chondrite impactor. These were originally deposited on the local (topographically high) oxic soils in Spain and N. Zealand and then laterally transported to the KPB sites by the impactinduced surface waters.

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Experimental evidence for the global acidification of surface ocean at the Cretaceous–Palaeogene boundary: the biogenic calcite-poor spherule layers

Cited by 6 publications

References 128 publications

Crossing the boundary: an elasmobranch fauna from Stevns Klint, Denmark

Crossing the boundary: an elasmobranch fauna from Stevns Klint, Denmark

Cretaceous-Paleogene Boundary Clays from Spain and New Zealand: Arsenic Anomaly and the Deccan Traps

Cretaceous-Paleogene Boundary Clays from Spainand New Zealand: Arsenic Anomalies

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