期刊
REVIEW OF PALAEOBOTANY AND PALYNOLOGY
卷 190, 期 -, 页码 85-103出版社
ELSEVIER
DOI: 10.1016/j.revpalbo.2012.11.002
关键词
Helvetic thrust unit; Cretaceous-Palaeogene boundary; geochemistry; calcareous nannoplankton; dinoflagellate cysts; palynofacies
资金
- Ministry of High Education of Egypt
In this study, dinoflagellate cyst and calcareous nannoplankton biostratigraphy allowed the recognition of the Cretaceous/Palaeogene boundary (K/Pg boundary) at the neritic Waidach section, north of Salzburg, Austria (Helvetic nappe system). The microfossil assemblages indicate calcareous nannoplankton Zone CC26 of latest Cretaceous age and part of the lowermost Palaeocene Zone NP1. However, the stratigraphic record across the K/Pg boundary is incomplete due to a minor fault The studied samples have yielded well preserved and high diversity dinoflagellate cyst assemblages with a total of 163 dinoflagellate cyst species and subspecies belonging to 62 genera. The composition of the dinoflagellate cyst assemblages changes drastically from Areoligera-dominated assemblages in the upper Maastrichtian to Hystrichosphaeridium-dominated assemblages in the lower Danian. This composition shows two Manumiella spikes in the upper Maastrichtian and an acme of Spongodinium delitiense in the lower Danian which are interpreted to reflect slight coolings of oceanic surface waters. The earliest Danian markers Carpatella cornuta, Senoniasphaera inornata and Damassadinium californicum have their first occurrences immediately above the K/Pg boundary. The peridinioid/gonyaulacoid (P/G) ratio of most samples suggests high paleoproductivity. Two palynofacies assemblages were distinguished indicating shelf to basin transitions and dysoxic to anoxic conditions. (c) 2012 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据