葡萄牙佩尼切最下层托阿尔阶的Sr同位素地层学(87Sr/86Sr)及其与菊石分带的关系

IF 2.1 3区 地球科学 Q1 GEOLOGY Newsletters on Stratigraphy Pub Date : 2020-06-15 DOI:10.1127/NOS/2019/0492
J. McArthur, K. Page, L. V. Duarte, M. Thirlwall, Q. Li, R. Weis, M. J. Comas-Rengifo
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引用次数: 8

摘要

在葡萄牙佩尼切,托阿尔西亚底的GSSP和Submediterranean省,托阿尔亚底的87Sr/86Sr的值为0.707 073±0.000 002(2s.e.,n=13)。在英国约克郡,一个次滨海省,托阿尔阶基底的87Sr/86Sr值为0.707 072±0.000 002(2s.e.,n=23)。这些值的相似性表明,在分析不确定性范围内,这些水平在时间上完全相等。在Peniche,Serpentinum(Falciferum/Levisoni)时间带底部的87Sr/86Sr值为0.707 096±0.000 003(2.s.e)。约克郡该边界的值为0.70 7 094±0.000 002(2s.e.,n=27)。这些值的相似性表明,在分析不确定性范围内,这些水平在时间上完全相等。同样的菊石序列出现在Peniche和约克郡最底层的Toarcian序列中。因此,在Peniche和约克郡之间,在测量不确定度范围内,Peniche的下托阿尔阶、Tethyan王国、Tenuicostatum(Polymorphum)[菊石]时间带与约克郡的下托亚尔阶、北方王国、Tenui costatum[菊石)时间带完全一致。通过Peniche的Tenuicostatum次同步臭氧的87Sr/86Sr剖面揭示了沉积速率的巨大变化,在区域的浓缩基底3m处沉积速率最低,在区域中部沉积速率最高,在区域上半部沉积速率向上下降。按87Sr/86Sr的比例分配时间表明,大约一半的Tenuicostatum时间被浓缩到剖面的基底3m中。
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Sr-isotope stratigraphy (87Sr/86Sr) of the lowermost Toarcian of Peniche, Portugal, and its relation to ammonite zonations
At Peniche, Portugal, the GSSP for the base of the Toarcian and in a Submediterranean province, a value of 0.707 073 ± 0.000 002 (2s.e., n = 13) is determined for 87Sr/86Sr at the base of the Toarcian. In Yorkshire, UK, a Subboreal province, the base of the Toarcian has an 87Sr/86Sr value of0.707 072 ± 0.000 002 (2s.e., n = 23). The similarity of the values shows that, within analytical uncertainty, these levels are exactly equivalent in time. At Peniche, the base of the Serpentinum (Falciferum/Levisoni) Chronozone has an 87Sr/86Sr value of 0.707 096 ± 0.000 003 (2.s.e). The value for this boundary in Yorkshire is 0.707 094 ± 0.000 002 (2s.e., n = 27). The similarity of the values shows that, within analytical uncertainty, these levels are exactly equivalent in time. The same ammonite successions occur through the lowermost Toarcian successions at Peniche and in Yorkshire. Between Peniche and Yorkshire, there is therefore an exact coincidence, within measurement uncertainty, between the Lower Toarcian, Tethyan Realm, Tenuicostatum (Polymorphum) [ammonite] Chronozone of Peniche and the Lower Toarcian, Boreal Realm, Tenuicostatum [ammonite] Chronozone of Yorkshire. The 87Sr/86Sr profile through the Tenuicostatum Subchronozone at Peniche reveals large variations in sedimentation rate, with lowest rates in a condensed basal 3 m of the zone, highest rates in mid-zone, with rates decreasing upward through the upper half of the zone. Apportioning time in proportion to 87Sr/86Sr shows that around half of Tenuicostatum time is condensed into the basal 3 m of the section.
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来源期刊
Newsletters on Stratigraphy
Newsletters on Stratigraphy 地学-地质学
CiteScore
5.50
自引率
4.50%
发文量
22
审稿时长
>12 weeks
期刊介绍: Newsletters on Stratigraphy is an international, peer-reviewed journal with a focus on stratigraphic issues that are relevant for a broad geoscientific community. Papers published in Newsletters on Stratigraphy use (and ideally integrate) stratigraphic methodologies from a wide field of disciplines, including (but not limited to) biostratigraphy, chronostratigraphy, chemostratigraphy, and magnetostratigraphy. The results have implications for paleogeographic reconstructions, paleoceanography, paleoclimate, biotic evolution, basin development, or regional and supraregional correlation. Papers published in Newsletters on Stratigraphy comprise original research articles, background information on ongoing work of e.g., the International Stratigraphic Commission (ICS) and the International Subcommission on Stratigraphic Classification (ISSC), and review articles. There are no page charges for the publication of regular papers.
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