DOI: 10.1016/j.epsl.2021.117011
论文题名: In-situ U-Pb dating of Ries Crater lacustrine carbonates (Miocene, South-West Germany): Implications for continental carbonate chronostratigraphy
作者: Montano D. ; Gasparrini M. ; Gerdes A. ; Della Porta G. ; Albert R.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2021
卷: 568 语种: 英语
中文关键词: chronostratigraphy
; lacustrine carbonates
; laser ablation
; Miocene
; U-Pb dating
英文关键词: Binary alloys
; Calcite
; Carbonation
; Cementing (shafts)
; Deposition
; Erosion
; Geochronology
; Inductively coupled plasma mass spectrometry
; Lakes
; Mass spectrometers
; Soils
; Calcite-cement
; Chronostratigraphy
; Diagenetics
; Lacustrine basins
; Lacustrine carbonate
; Laser-ablation inductively-coupled plasma mass spectrometry
; Lasers ablations
; Micrites
; Miocene
; U-Pb dating
; Laser ablation
; carbonate
; chronostratigraphy
; geochronology
; inductively coupled plasma method
; lacustrine deposit
; laser method
; mass spectrometry
; Miocene
; uranium-lead dating
; Bavaria
; Germany
; Ries Crater
英文摘要: The Nördlinger Ries Crater lacustrine basin (South-West Germany), formed by a meteorite impact in the Miocene (Langhian; ∼14.9 Ma), offers a well-established geological framework to understand the strengths and limitations of U-Pb LA-ICPMS (in situ Laser Ablation-Inductively Coupled Plasma Mass Spectrometry) geochronology as chronostratigraphic tool for lacustrine (and more broadly continental) carbonates. The post-impact deposits include siliciclastic basinal facies at the lake centre and carbonate facies at the lake margins, coevally deposited in a time window of >1.2 and <2 Ma. Depositional and diagenetic carbonate phases (micrites and calcite cements) were investigated from three marginal carbonate facies (Hainsfarth bioherm, Adlersberg bioherm and Wallerstein mound). Petrography combined with C and O stable isotope analyses indicate that most depositional and early diagenetic carbonates preserved pristine geochemical compositions and thus the U-Pb system should reflect the timing of original precipitation. In total, 22 U-Pb ages were obtained on 10 different carbonate phases from five samples. The reproducibility and accuracy of the U-Pb (LA-ICPMS) method were estimated to be down to 1.5% based on repeated analyses of a secondary standard (speleothem calcite ASH-15d) and propagated to the obtained ages. Micrites from the Hainsfarth, Adlersberg and Wallerstein facies yielded ages of 13.90 ± 0.25, 14.14 ± 0.20 and 14.33 ± 0.27 Ma, respectively, which overlap within uncertainties, and are consistent with the weighted average age of 14.30 ± 0.20 Ma obtained from all the preserved depositional and early diagenetic phases. Data indicate that sedimentation started shortly after the impact and persisted for >1.2 and <2 Ma, in agreement with previous constraints from literature, therefore validating the accuracy of the applied method. Later calcite cements were dated at 13.2 ± 1.1 (nw=2), 10.2 ± 2.7 and 9.51 ± 0.77 Ma, implying multiple post-depositional fluid events. This study demonstrates the great potential of the U-Pb method for chronostratigraphy in continental systems, where correlations between time-equivalent lateral facies are often out of reach. In Miocene deposits the method yields a time resolution within the 3rd order depositional sequences (0.5–5 Ma). © 2021 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165607
Appears in Collections: 气候变化与战略
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作者单位: IFP Energies nouvelles, 1-4 avenue de Bois-Préau, Rueil-Malmaison, 92852, France; Institut für Geowissenschaften, Goethe University Frankfurt, Altenhöferallee 1, Frankfurt am Main, 60438, Germany; Frankfurt Isotope and Element Research Center (FIERCE), Goethe University Frankfurt, Frankfurt am Main, Germany; Sorbonne Université, ED 398 – GRNE, 4, place Jussieu, Paris, 75252, France; Università degli Studi di Milano, Dipartimento di Scienze della Terra “Ardito Desio”, via Mangiagalli 34, Milan, 20133, Italy
Recommended Citation:
Montano D.,Gasparrini M.,Gerdes A.,et al. In-situ U-Pb dating of Ries Crater lacustrine carbonates (Miocene, South-West Germany): Implications for continental carbonate chronostratigraphy[J]. Earth and Planetary Science Letters,2021-01-01,568