Is Strontium-isotope stratigraphy a reliable tool for dating shallow-marine platform carbonates at the Barremian-Aptian transition? Review of western Tethyan case studies

IF 1.5 4区地球科学 Q2 GEOLOGY

Carnets De Geologie Pub Date : 2018-04-21 DOI:10.4267/2042/66931

C. Frau, J. Masse, M. Fenerci‐Masse, A. Tendil, A. Pictet, C. Lanteaume

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引用次数: 6

Abstract

Strontium-isotope measurements on Lower Cretaceous marine rocks derive from belemnite material sampled in ammonite-constrained basinal successions. A group of values with a narrow range across the Barremian/Aptian boundary does not allow the separation of the uppermost Barremian (Martelites sarasini ammonite zone) from the lower Aptian pro parte (Deshayesites oglanlensis-D. forbesi ammonite zones). Growing numbers of studies applied Sr-Isotope Stratigraphy (SIS) on Barremian-Aptian shallow-marine sequences (Urgonian facies) in order to solve controversial results obtained by using different shallow-water biological time markers. Based on re-examination of case studies, we conclude that Sr-isotope values can neither be used to prove nor to disprove the location of the putative Barremian/Aptian boundary based on biostratigraphy. Pending more data available, SIS should be used with caution for dating ammonite-free carbonate sediments in the corresponding time interval.

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锶同位素地层学是确定Barremian-Aptian过渡期浅海平台碳酸盐岩年代的可靠工具吗？特提斯西部案例研究综述

下白垩统海相岩石的锶同位素测量来自于在受鹦鹉石约束的盆地演替中取样的蛭石物质。Barremian/Aptian边界上的一组数值范围较窄，不能将Barremian最上端(Martelites sarasini菊石带)与Aptian下部(Deshayesites oglanlensis-D)分离开来。Forbesi菊石带)。越来越多的研究将sr同位素地层学(SIS)应用于巴雷米亚-阿普梯浅海层序(乌尔贡相)，以解决不同浅水生物时间标记所得到的有争议的结果。基于对案例研究的重新检验，我们得出结论，sr同位素值既不能用来证明也不能用来否定基于生物地层学的假定巴雷米亚/阿普田界线的位置。在获得更多数据之前，应谨慎使用SIS在相应的时间间隔内测定无菊石碳酸盐沉积物的年代。

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来源期刊

Carnets De Geologie Earth and Planetary Sciences-Geology

CiteScore

2.90

自引率

14.30%

发文量

审稿时长

>12 weeks

期刊介绍： Information not localized