DOI: 10.1016/j.palaeo.2015.06.018
论文题名: Geochemical and palynological sea-level proxies in hemipelagic sediments: A critical assessment from the Upper Cretaceous of the Czech Republic
作者: Olde K. ; Jarvis I. ; Uličný D. ; Pearce M.A. ; Trabucho-Alexandre J. ; Čech S. ; Gröcke D.R. ; Laurin J. ; Švábenická L. ; Tocher B.A.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2015
卷: 435 起始页码: 222
结束页码: 243
语种: 英语
英文关键词: Chemostratigraphy
; Cretaceous
; Dinoflagellate cysts
; Palynology
; Sea-level change
英文摘要: Geochemical and palynological records are presented for an expanded Turonian-Coniacian hemipelagic succession in the central Bohemian Cretaceous Basin. A high-resolution stratigraphic framework is provided by biostratigraphy and organic carbon stable-isotope (δ13Corg ) chemostratigraphy. A short-term (100 kyr) sea-level curve has been derived from high-resolution transgressive/regressive maxima / shore-proximity data established from basin-wide sediment geometries. The viability of geochemical and palynological parameters as potential sea-level proxies is tested against this independently derived sea-level record. Elemental chemostratigraphy is demonstrated to offer a reliable means of identifying medium- to long-term (0.4-2.4 Myr) sea-level trends. Manganese maxima are associated with periods of high sea level, and troughs with intervals of low sea level. Falling Mn contents accompany regression and rising values transgression. Major transgressive events associated with medium-term sea-level change are marked by sharp increases in Ti/Al ratios, but short-term (100 kyr) sea-level cycles are not consistently identified. Long-term δ13Corg variation and dinoflagellate cyst species richness are positively correlated and show similarities to the sea-level curve. Baseline trends have a cycle duration close to the 2.4 Myr long-eccentricity cycle. Dinocyst species richness closely follows short-term changes in sea level, with marked increases in dinocyst diversity coincident with most short-term flooding events. Periods of rapid sea-level rise caused an influx of a more diverse 'outer shelf' assemblage into the study area, together with the addition of shallower water species, some of which may have been transported into the central basin by hypopycnal flows. Changes in the proportion and abundance of peridinioid dinoflagellate cysts (principally Palaeohystrichophora infusorioides) were controlled principally by changing nutrient levels. Proximity proxies derived from geochemical and palynological data are not always consistent with the independent sea-level model. This exemplifies the need to understand all factors influencing elemental geochemical and palynological proxies before making simplistic sea level interpretations. © 2014 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/68867
Appears in Collections: 过去全球变化的重建
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作者单位: Kingston University London, Centre for Earth and Environmental Sciences Research, School of Geography, Geology and Environment, Kingston upon Thames, United Kingdom; Institute of Geophysics, Academy of Sciences of the Czech Republic, Prague, Czech Republic; Evolution Applied Ltd, 50 Mitchell Way, Upper Rissington, Cheltenham, United Kingdom; Durham University, Department of Earth Sciences, Durham, United Kingdom; Institute of Earth Sciences, Utrecht, Budapestlaan 4, Utrecht, Netherlands; Czech Geological Survey, Prague, Czech Republic; Statoil, 2103 Citywest Blvd Ste 800, Houston, TX, United States
Recommended Citation:
Olde K.,Jarvis I.,Uličný D.,et al. Geochemical and palynological sea-level proxies in hemipelagic sediments: A critical assessment from the Upper Cretaceous of the Czech Republic[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2015-01-01,435