DOI: 10.1016/j.palaeo.2014.03.033
论文题名: A high-resolution carbon-isotope record of the Turonian stage correlated to a siliciclastic basin fill: Implications for mid-Cretaceous sea-level change
作者: Uličný D. ; Jarvis I. ; Gröcke D.R. ; Čech S. ; Laurin J. ; Olde K. ; Trabucho-Alexandre J. ; Švábenická L. ; Pedentchouk N.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2014
卷: 405 起始页码: 42
结束页码: 58
语种: 英语
英文关键词: Bohemian cretaceous basin
; Carbon isotopes
; Eustasy
; Greenhouse climate
; Sequence stratigraphy
; Turonian
英文摘要: Turonian strata of the Bohemian Cretaceous Basin, Central Europe, preserve a basin-scale record of shoreline transgressions and regressions, previously interpreted to have been strongly influenced by short-term eustatic cycles. Here, nearshore siliciclastic strata in two separate sub-basins are correlated to a multi-stratigraphic dataset generated from a new research core (Bch-1) drilled in offshore marine sediments of the central basin. A high-resolution δ13Corg record from Bch-1 is presented along with major- and minor-element proxies, TOC, carbonate content, terrestrial to marine palynomorph ratios, and detailed macro- and microfossil biostratigraphy. The 400m thick Turonian through Lower Coniacian interval permits correlation to the highest-resolution C-isotope curves available: all carbon-isotope events demonstrated by δ13Ccarb studies in the British Chalk, NW Germany and other reference sections in Europe are recognized in the δ13Corg curve from Bch-1.A number of short-term, basin-wide regressions in the Bohemian Cretaceous Basin, most likely reflecting eustatic falls, show a recurrence interval of 100. kyr or less. This is an order of magnitude shorter than the timing of sea-level falls inferred from the New Jersey margin and the Apulian platform, interpreted to be driven by glacioeustacy. The estimated magnitude of the Bohemian Basin sea-level falls, typically 10-20. m and generally <. 40. m, indicates that the 2.4. Myr period suggested by others to generate 3rd-order cycles, is too long to be the principal cycle generating unconformities in rapidly-subsiding basins, where the rate of eustatic fall must exceed the subsidence rate. Unconformities in low-accommodation settings such as passive margins most likely represent amalgamated records of multiple cycles of sea-level fluctuations of 100. kyr scale, recognizable only in high-resolution datasets from expanded successions. Comparison of the δ13C excursions to the interpreted sea-level record has not yielded a clear causal link. A long-term 'background' δ13C cycle shows a duration close to the 2.4Myr long-eccentricity cycle, and shorter-term (1Myr scale) highs and lows in δ13C appear to broadly correspond to intervals characterised by more pronounced short-term sea-level highs and lows, respectively. However, on the scale of intermediate to short-term δ13C fluctuations, no systematic relationship between δ13C and sea-level change can be demonstrated. © 2014 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/69321
Appears in Collections: 过去全球变化的重建
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作者单位: Institute of Geophysics, Academy of Sciences of the Czech Republic, 141 31 Prague, Czech Republic; School of Geography, Geology and Environment, Kingston University London, Kingston upon Thames KT1 2EE, United Kingdom; Department of Earth Sciences, University of Durham, Durham DH1 3LE, United Kingdom; Czech Geological Survey, 118 21 Prague, Czech Republic; School of Environmental Sciences, University of East Anglia, Norwich NR4 7TJ, United Kingdom
Recommended Citation:
Uličný D.,Jarvis I.,Gröcke D.R.,et al. A high-resolution carbon-isotope record of the Turonian stage correlated to a siliciclastic basin fill: Implications for mid-Cretaceous sea-level change[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2014-01-01,405