以色列南部内盖夫北部古新世晚期至始新世中期碳同位素地层学:古气候重建的潜力

IF 2.1 3区 地球科学 Q1 GEOLOGY
C. D. Fokkema, S. Buijs, O. Bialik, A. Meilijson, N. Waldmann, Y. Makovsky, J. Frieling, G. Dickens, A. Sluijs
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引用次数: 0

摘要

在过去的二十年里,出现了描述古近纪早期气候和碳循环显著变化的沉积记录。连续、长期、高分辨率的记录大多来自深海岩芯,只有少数来自大陆边缘位置。在这里,我们检查了从内盖夫沙漠北部(以色列南部)的岩芯(RH-323)中采集的古近系下部泥灰岩和白垩岩。所研究的沉积物堆积在特提斯南部约500–700米古深度的大陆坡上,没有进行深埋。我们分析了大块碳酸盐稳定的碳和氧同位素以及大块磁化率。由此产生的记录可以与其他地方的记录相一致,包括古新世碳同位素最大值(PCIM)、古新世-始新世热最大值(PETM)和早始新世气候最佳值(EECO)。一个明显的认识是局部岩性变化与主要气候和碳循环变化之间的一致性。其他地方的沉积序列也强调了这一点,但内盖夫的关系不同,因此富含碳酸盐的层段标志着PCIM和PETM,从泥灰岩到白垩岩的过渡引发了EECO。总的来说,以色列南部相对原始和未成熟的沉积物记录可能为在关键时间段和世界关键地区重建高分辨率古气候和碳循环提供了潜力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Late Paleocene to middle Eocene carbon isotope stratigraphy of the Northern Negev, Southern Israel: potential for paleoclimate reconstructions
. Sedimentary records depicting significant variability in climate and carbon cycling across the early Paleogene have emerged over the last two decades. Continuous, long-term, high-resolution records mostly derive from deep-sea drill cores, and only few derive from continental margin locations. Here we examine lower Paleogene marls and chalks collected from a core (RH-323) in the Northern Negev Desert (Southern Israel). The studied sediments accumulated on a continental slope of the southern Tethys at ~500–700 m paleodepth and did not undergo deep burial. We analyzed bulk carbonate stable carbon and oxygen isotopes and bulk magnetic susceptibility. The resulting records can be aligned with those from elsewhere and include the Paleocene Carbon Isotope Maximum (PCIM), Paleocene Eocene Thermal Maximum (PETM) and Early Eocene Climatic Optimum (EECO). An obvious realization is a concurrence between local lithological variations and major climate and carbon cycle changes. This has been highlighted for sedimentary sequences elsewhere, but the relations differ in the Negev, such that carbonate rich intervals mark the PCIM and PETM, and a transition from marl to chalk initiates the EECO. Overall, the relatively pristine and immature sediment records in southern Israel likely provide potential for high-resolution paleoclimate and carbon cycle reconstructions during a crucial time interval and in a crucial part of the world.
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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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