High Resolution Carbon and Oxygen Isotope Profiles of Foraminifera and tha Ca-Normalized Sr Curve from Late Maastrichtian across the KTB at Elles, Tunisia.

TitleHigh Resolution Carbon and Oxygen Isotope Profiles of Foraminifera and tha Ca-Normalized Sr Curve from Late Maastrichtian across the KTB at Elles, Tunisia.
Publication TypeJournal Article
Year of Publication2000
AuthorsD, S, Kramar, U, BERNER, ZSOLT, M.A., L, Stinnesbeck, W, Adatte, T
JournalIsotopes in Environmental and Health Studies
Volume36
Pagination393-396
Date Published01
Abstract

Due to the discussion of global catastrophic events at the Cretaceous-Tertiary (KT) boundary based on various reason e.g. [1], [2], [3], [4] and to controversial discussion on the faunal extinction based on high-resolution biostratigraphic investigations e.g. [5], [6] studies to investigate the climate record of the last million years of the Maastrichtian became important.

Stable isotope studies of deep sea sites in the Pacific and South Atlantic reveal a terminal Cretaceous warm event as a distinct 2-3o C warming of intermediate waters across latitudes and a 2-3o C warming in surface waters in middle and high southern latitudes [7]. The well documented long-term cooling trend that characterizes the late Cretaceous was terminated by a short-term warming followed by a rapid cooling near the end of the Maastrichtian 100-200 kyr before the KT boundary [8], [9].

However, different sample resolution, condensed or erosional sedimentation, short-term hiatuses, bioturbation, diagenetic alteration etc. makes a highresolution chemostratigraphy necessary to determine the nature of this terminal Cretaceous warm event and the cooling shortly below the KT boundary.

Climate and depositional variations during the last 570 000 years of Late Maastrichtian are presented for a 26 m long ELLES section on the base of a highresolution chemostratigraphy (d13 C, d18 O isotopes andCa-normalized Sr gradients).  PDF