NDLI: Stable isotope stratigraphy across the K/T boundary, and isotopic investigations of an ‘Ignored’ worm bed, Eastern Desert, Egypt

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Facies : Volume 36

Stable isotope stratigraphy across the K/T boundary, and isotopic investigations of an ‘Ignored’ worm bed, Eastern Desert, Egypt

Content Provider	Springer Nature Link
Author	Shaaban, Mohamed N. A.
Copyright Year	1997
Abstract	Oxygen and carbon stable isotope profiles of the Dakhla sequence at the Eastern Desert, Egypt, reveal that the negative isotopic excursion commonly observed at the K/T boundary in sections showing continuous deposition around the world (e.g. El Kef section at Tunisia,Perch-Nielsen et al.; 1982 and at Zumaya, Spain;Mount et al., 1986) is missing in this Egyptian study area. However, several negative isotopic excursions are observed both under and over the boundary separating the Upper Cretaceous and Paleocene rocks. These excursions correspond to short-term sea level falls and coincide with both lithologic and faunal changes. They occur during periods with a decreasing influence of the equator-dominated ocean circulation system and the set up of a polar-dominated ocean circulation system.The Dakhla sequence consists of cyclic alternations of thick hemipelagic marls and shales and thin benthic limestone beds. The origin of the cyclic alternation is related to short-term sea level changes. A thin reefal worm bed is observed within the lower part of the sequence. The formation of this worm buildup occurred during a stillstand prior to sea level fall. The oxygen isotopic composition of the unaltered worm tubes (−1.0 to −2.7 ‰ PDB) is in accord with their formation in equilibrium with unmodified seawater. Meanwhile, their relatively depleted carbon isotopic values (−4.9 to −6.1 ‰ PDB) are primarily related to vital effect. Some intraskeletal voids within the worm bed are filled by a late meteoric calcite cement. The meteoric origin of the cement mosaics is indicated from their relatively depleted oxygen isotope values (−3.3 to −5.9 ‰ PDB), their equant morphology and their mottled dull luminescence.
Starting Page	137
Ending Page	145
Page Count	9
File Format	PDF
ISSN	01729179
Journal	Facies
Volume Number	37
Issue Number	1
e-ISSN	16124820
Language	English
Publisher	Springer-Verlag
Publisher Date	1997-01-01
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Worm Bed Isotopic Excursions Dakhla Sequence K/T Boundary Biogeosciences Geochemistry Paleontology Sedimentology Ecology
Content Type	Text
Resource Type	Article
Subject	Geology Stratigraphy Paleontology

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