Lower Aptian carbon isotope stratigraphy from a distal carbonate shelf setting: the Cau section, Prebetic zone, SE Spain
Lower Aptian carbon isotope stratigraphy from a distal carbonate shelf setting: the Cau section, Prebetic zone, SE Spain
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DOI：
10.1016/s0031-0182(03)00451-6
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发表时间：
2003-11
期刊：
影响因子：
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通讯作者：
G. A. Gea;J. M. Castro;R. Aguado;P. Ruiz‐Ortiz
中科院分区：
文献类型：
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作者：
G. A. Gea;J. M. Castro;R. Aguado;P. Ruiz‐Ortiz
在西班牙东南部的前bebetic带（Cau剖面），报道了巴雷末—早阿普tian剖面的δ13C曲线。研究剖面记录了半深海深色页岩序列，沉积在高沉降速率的远端碳酸盐斜坡上，毗邻浅层碳酸盐环境。该剖面的综合生物地层学以菊石、浮游有孔虫和钙质纳米化石为基础，并允许对演替进行准确的定年。δ13C曲线具有明显的演化特征，可识别出3次大偏移，并划分为8段，表明生物地层分辨率有所提高。同位素和生物地层学的对比，即使在更高的分辨率下，与其他分辨率较高的剖面的对比也是非常准确的。与浅台地灰岩低分辨率生物地层特征剖面的对比也得到了很好的结果，证明了碳同位素地层学作为对比工具的有效性。
A δ13C curve is reported for the latest Barremian to Early Aptian at a section located in the Prebetic zone (Cau section, SE Spain). The studied section records a hemipelagic succession of dark shales, deposited on a distal carbonate ramp with a high subsidence rate, adjacent to shallow carbonate environments. The integrated biostratigraphy of the section is based on ammonites, planktonic foraminifera and calcareous nannofossils, and it has allowed an accurate dating of the succession. The δ13C curve presented shows a distinctive evolution, leading to the recognition of three major excursions, as well as a subdivision into eight segments, which represents an improvement of the current biostratigraphic resolution. The correlation, both isotopic and biostratigraphical, with other well resolved sections is very accurate even at the higher resolution attained. Correlation with sections with low-resolution biostratigraphic characterisation from shallow platform limestones also gives good results, which supports the effectiveness of carbon isotope stratigraphy as a correlation tool.