The Cretaceous–Tertiary boundary in southern low‐latitude regions: preliminary study in Pernambuco, northeastern Brazil

ABSTRACT A preliminary integrated study of a Cretaceous‐Tertiary (K/T) boundary section in Pernambuco, northeastern Brazil, provides evidence for an extraterrestrial bolide impact in the earliest Danian. A non‐graded, nodular carbonate mudstone/wackestone bed is interpreted as a slump or a mud Flow...

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Published in:Terra Nova
Main Authors: Albertão, Gilberto A., Koutsoukos, Eduardo A.M., Regali, Marília P.S., Attrep, Moses, Martins, Paulo P.
Format: Article in Journal/Newspaper
Language:English
Published: Wiley 1994
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Online Access:http://dx.doi.org/10.1111/j.1365-3121.1994.tb00509.x
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spelling crwiley:10.1111/j.1365-3121.1994.tb00509.x 2024-06-02T08:13:26+00:00 The Cretaceous–Tertiary boundary in southern low‐latitude regions: preliminary study in Pernambuco, northeastern Brazil Albertão, Gilberto A. Koutsoukos, Eduardo A.M. Regali, Marília P.S. Attrep, Moses Martins, Paulo P. 1994 http://dx.doi.org/10.1111/j.1365-3121.1994.tb00509.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1365-3121.1994.tb00509.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1365-3121.1994.tb00509.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Terra Nova volume 6, issue 4, page 366-375 ISSN 0954-4879 1365-3121 journal-article 1994 crwiley https://doi.org/10.1111/j.1365-3121.1994.tb00509.x 2024-05-03T11:29:16Z ABSTRACT A preliminary integrated study of a Cretaceous‐Tertiary (K/T) boundary section in Pernambuco, northeastern Brazil, provides evidence for an extraterrestrial bolide impact in the earliest Danian. A non‐graded, nodular carbonate mudstone/wackestone bed is interpreted as a slump or a mud Flow deposit, induced by a tsunami event or by a gravity mass movement during a sea‐level lowstand, the former possibly generated by the K/T boundary Yucatán impact. This bed overlies marlstones deposited in an upper bathyal environment and marks the top of the Cretaceous. Nearly all known latest Maastrichtian planktonic foraminifera are recovered from the Cretaceous strata. Iridium shows a marked peak in a thin hemipelagic claystone layer, about 75 cm above the K/T boundary, deposited in a middle to deep neritic environment. The claystone overlies alternating beds of finegrained limestones and marlstones and a 50 cm‐thick graded bioclastic packstone, which rests upon a marly limestone breccia of the lowermost Danian. Abundant reworked Cretaceous and rare lowermost Danian microfossils (e.g. E. edita, E. eobulloides, E. fringa, G. irregularis, P. eugubina, P. cf. pseudobulloides, W. claytonensis and W. hornerstownensis ) have been recovered from these strata. These lowermost Danian beds record the sudden appearance of abundant shock‐metamorphosed quartz grains, with several sets of intersecting deformation lamellae and microtektite‐like microspherules. This suggests that these deposits were formed by an additional tsunami caused by a second impact event in the earliest Danian, near or at the boundary between the Palaeocene P α and P 1a foraminiferal zones. Impact‐derived material has not been found in the uppermost Cretaceous beds. Article in Journal/Newspaper Planktonic foraminifera Wiley Online Library Terra Nova 6 4 366 375
institution Open Polar
collection Wiley Online Library
op_collection_id crwiley
language English
description ABSTRACT A preliminary integrated study of a Cretaceous‐Tertiary (K/T) boundary section in Pernambuco, northeastern Brazil, provides evidence for an extraterrestrial bolide impact in the earliest Danian. A non‐graded, nodular carbonate mudstone/wackestone bed is interpreted as a slump or a mud Flow deposit, induced by a tsunami event or by a gravity mass movement during a sea‐level lowstand, the former possibly generated by the K/T boundary Yucatán impact. This bed overlies marlstones deposited in an upper bathyal environment and marks the top of the Cretaceous. Nearly all known latest Maastrichtian planktonic foraminifera are recovered from the Cretaceous strata. Iridium shows a marked peak in a thin hemipelagic claystone layer, about 75 cm above the K/T boundary, deposited in a middle to deep neritic environment. The claystone overlies alternating beds of finegrained limestones and marlstones and a 50 cm‐thick graded bioclastic packstone, which rests upon a marly limestone breccia of the lowermost Danian. Abundant reworked Cretaceous and rare lowermost Danian microfossils (e.g. E. edita, E. eobulloides, E. fringa, G. irregularis, P. eugubina, P. cf. pseudobulloides, W. claytonensis and W. hornerstownensis ) have been recovered from these strata. These lowermost Danian beds record the sudden appearance of abundant shock‐metamorphosed quartz grains, with several sets of intersecting deformation lamellae and microtektite‐like microspherules. This suggests that these deposits were formed by an additional tsunami caused by a second impact event in the earliest Danian, near or at the boundary between the Palaeocene P α and P 1a foraminiferal zones. Impact‐derived material has not been found in the uppermost Cretaceous beds.
format Article in Journal/Newspaper
author Albertão, Gilberto A.
Koutsoukos, Eduardo A.M.
Regali, Marília P.S.
Attrep, Moses
Martins, Paulo P.
spellingShingle Albertão, Gilberto A.
Koutsoukos, Eduardo A.M.
Regali, Marília P.S.
Attrep, Moses
Martins, Paulo P.
The Cretaceous–Tertiary boundary in southern low‐latitude regions: preliminary study in Pernambuco, northeastern Brazil
author_facet Albertão, Gilberto A.
Koutsoukos, Eduardo A.M.
Regali, Marília P.S.
Attrep, Moses
Martins, Paulo P.
author_sort Albertão, Gilberto A.
title The Cretaceous–Tertiary boundary in southern low‐latitude regions: preliminary study in Pernambuco, northeastern Brazil
title_short The Cretaceous–Tertiary boundary in southern low‐latitude regions: preliminary study in Pernambuco, northeastern Brazil
title_full The Cretaceous–Tertiary boundary in southern low‐latitude regions: preliminary study in Pernambuco, northeastern Brazil
title_fullStr The Cretaceous–Tertiary boundary in southern low‐latitude regions: preliminary study in Pernambuco, northeastern Brazil
title_full_unstemmed The Cretaceous–Tertiary boundary in southern low‐latitude regions: preliminary study in Pernambuco, northeastern Brazil
title_sort cretaceous–tertiary boundary in southern low‐latitude regions: preliminary study in pernambuco, northeastern brazil
publisher Wiley
publishDate 1994
url http://dx.doi.org/10.1111/j.1365-3121.1994.tb00509.x
https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1365-3121.1994.tb00509.x
https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1365-3121.1994.tb00509.x
genre Planktonic foraminifera
genre_facet Planktonic foraminifera
op_source Terra Nova
volume 6, issue 4, page 366-375
ISSN 0954-4879 1365-3121
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op_doi https://doi.org/10.1111/j.1365-3121.1994.tb00509.x
container_title Terra Nova
container_volume 6
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