Shallow-marine sediment records have the strong potential to display sensitive environmental changes in sedimentary geometries and skeletal content. However, the time resolution of most neritic carbonate records is not high enough to be compared with climatic events as recorded in the deep-sea sediment archives. In order to resolve the paleoceanographic and paleoclimatic changes during the Oligocene-Miocene transition in the Mediterranean shallow water carbonate systems with the best possible time resolution, we re-evaluated the Decontra section on the Maiella Platform (central Apennines, Italy), which acts as a reference for the correlation of Oligocene-Miocene shallow water deposits in the Mediterranean region. The 120-m-thick late Oligocene-late Miocene carbonate succession is composed of larger foraminiferal, bryozoan and corallinacean limestones interlayered with distinct planktonic foraminiferal carbonates representing a mostly outer neritic setting. Integrated multi-proxy and facies analyses indicate that CaCO3 and total organic carbon contents as well as gamma-ray display only local to regional processes on the carbonate platform and are not suited for stratigraphic correlation on a wider scale. In contrast, new biostratigraphic data correlate the Decontra stable carbon isotope record to the global deep-sea carbon isotope record. This links relative sea level fluctuations, which are reflected by facies and magnetic susceptibility changes, to third-order eustatic cycles. The new integrated bio-, chemo-, and sequence stratigraphic framework enables a more precise timing of environmental changes within the studied time interval and identifies Decontra as an important locality for correlating not only shallow and deep water sediments of the Mediterranean region but also on a global scale.

译文

:浅海沉积物记录具有显示沉积几何形状和骨骼含量敏感的环境变化的强大潜力。但是,大多数含碳酸盐岩碳酸盐记录的时间分辨率不够高,无法与深海沉积物档案中记录的气候事件进行比较。为了解决地中海浅水碳酸盐系统渐新世-中新世过渡期的古海洋学和古气候变化,并尽可能以最佳的时间分辨率,我们重新评估了Maiella平台(意大利亚平宁山脉中部)的Decontra断面地中海地区渐新世-中新世浅水沉积物的相关性的参考。渐新世晚期中新世晚期碳酸盐岩层序为120米,由较大的有孔虫,苔藓虫和珊瑚虫灰岩夹杂,中间夹杂着明显的浮游有孔虫碳酸盐,这些碳酸盐岩主要代表外部胶体环境。综合的多代理和相分析表明,碳酸钙平台上的碳酸钙和总有机碳含量以及伽马射线仅显示局部或局部过程,不适用于更广泛的地层对比。相反,新的生物地层学数据将Decontra稳定碳同位素记录与全球深海碳同位素记录相关联。这将相对的海平面波动(由相和磁化率的变化反映出来)与三阶优旋周期联系起来。新的生物,化学和层序综合地层学框架能够在研究的时间间隔内更精确地确定环境变化的时间,并将Decontra视为重要的地区,不仅可以关联地中海地区的浅水和深水沉积物,而且还可以关联海底沉积物。世界规模。

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