洞穴方解石年代测定的一种新的多方法:在 Trou du Renard 洞穴(法国索翁)中的应用

IF 2.7 Q2 GEOCHEMISTRY & GEOPHYSICS
Loïc A. Martin, J. Nouet, A. Dapoigny, G. Barbotin, F. Claverie, E. Pons‐Branchu, J. Barbarand, C. Pécheyran, N. Mercier, Fanny Derym, Bernard Gély, H. Valladas
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引用次数: 0

摘要

摘要本文介绍了一种多方法方法,旨在确定碳酸盐岩顶沉积的特征,并提出这些碳酸盐岩壳的年代学。对事先用光学显微镜、阴极荧光显微镜和傅立叶变换红外显微光谱定性的样品,采用放射性方法(最近样品的 C-14 和 U 系列)进行了年代测定。在铀系列方面,采用液相多收集器电感耦合等离子体质谱法(ICP-MS)对大样本进 行了高精度的铀-钍年龄测定,而激光烧蚀单收集器电感耦合等离子体扇场质谱法 (ICP-SFMS)则以高空间分辨率提供了取样可靠性方面的信息。这种方法以这两种技术的结合为基础,并通过方解石表征方法获得的信息加以强化,被应用于 Trou du Renard 洞穴(法国索翁)的碳酸盐沉积。两种 U-Th 测年技术获得的年龄具有可比性,说明样本中不同层系的沉积速度不同。今后,这一基于样品的矿物学和地球化学特征以及辐射测定法测定其年代的程序将应用于沉积在旧石器时代装饰壁上的顶板碳酸盐层。当结晶速度较慢时,采用成像技术的 U/Th 测定法以及液相多收集器 ICP-MS 测定法都很有意义。在极少量材料上开发可靠的年代测定方法将使确定石窟岩画的年代框架成为可能。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A new multimethod approach for dating cave calcite: application to the cave of Trou du Renard (Soyons, France)
Abstract. A multimethod approach aimed at characterizing carbonate parietal deposits and at proposing a chronology for these carbonate crusts is described. Dating was performed by radiometric methods (C-14 for recent samples and U series) on samples that had been characterized beforehand using optical and cathodoluminescence microscopy and Fourier transform infrared microspectroscopy. For the U series, high precision on U–Th ages was achieved using liquid phase multicollector inductively coupled plasma mass spectrometry (ICP-MS) applied to large samples, while laser ablation single collector inductively coupled plasma sector field mass spectrometry (ICP-SFMS) provided information on the reliability of the sampling with a high spatial resolution. This methodology, based on the combination of these two techniques reinforced by the information obtained by the calcite characterization methods, was applied to carbonate deposits from the cave of Trou du Renard (Soyons, France). The ages obtained with the two U–Th dating techniques are comparable and illustrate that different laminae were deposited at different rates in the samples. In the future, this procedure, based on the mineralogical and geochemical characterization of the samples and their dating by radiometric methods, will be applied to the layers of parietal carbonates deposited on Palaeolithic decorated walls. When the crystallization is slow, the U/Th dating method by imaging technique is of interest, as well as that by multicollector ICP-MS in liquid phase. The development of robust dating methods on very small quantities of material will make it possible to define the chronological framework of cave rock art.
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来源期刊
Geochronology
Geochronology Earth and Planetary Sciences-Paleontology
CiteScore
6.60
自引率
0.00%
发文量
35
审稿时长
19 weeks
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