In search of the Burdigalian GSSP: new evidence from the Contessa Section (Italy)

IF 1 4区 地球科学 Q4 GEOSCIENCES, MULTIDISCIPLINARY Italian Journal of Geosciences Pub Date : 2019-06-01 DOI:10.3301/IJG.2019.07
Alessio Fabbrini, N. Baldassini, C. Caricchi, L. Foresi, L. Sagnotti, J. Dinarès‐Turell, A. Stefano, F. Lirer, M. Menichetti, A. Winkler, S. Distefano
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引用次数: 10

Abstract

The Contessa Section is a reference section for the early Miocene in the Mediterranean. Along this 36 m thick section 115 samples were collected and analysed for an integrated bio-magnetostratigraphic study through the Scaglia Cinerea and Bisciaro formations. Planktonic foraminifera were analysed semi-quantitatively, while calcareous nannofossils were examined using the standard quantitative method. A reliable biozonation for both fossil groups was then accomplished. The paleomagnetic analyses identified a sequence of magnetozones, then correlated with the ATNTS using the calcareous plankton bioevents. The investigated interval extends from foraminiferal Zone P22 (Chattian) to MMi2c (Burdigalian) and from calcareous nannofossils Zone MNP25a to MNN3a, thus from Chron C7An to C5En. Therefore, the section chronologically spans from 24.80 Ma to18.10 Ma. Three hiatuses were recognised along the section: H1 at 0.63 m from the base (comprising a minimum time interval from 24.36 Ma to 23.38 Ma), H2 at 12.33 m (between 21.80 Ma and 21.35 Ma) and H3 at 34.03 (between 19.21 Ma and 18.40 Ma). All three hiatuses were correlated with regional megahiatuses identified in the North Atlantic Ocean and in the Paratethys area. Furthermore, the First Occurrenceof the calcareous nannofossil Helicosphera ampliaperta is recognised within Chron C6An.2n at 19.77 m from the base (6 m above the volcaniclastic Raffaello Level). This event provisionally defines the Aquitanian/Burdigalian boundary according to the literature. Thus, the Contessa Section is a possible candidate for the definition of theBurdigalian Global Stratigraphic Section and Point. Finally, the age of the Raffaello Level (a regional marker horizon for the early Miocene) is discussed in this new integrated stratigraphic framework, falling in Chron C6AAn and dated between 21.09 Ma and 21.08 Ma.
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寻找Burdigalian GSSP:来自Contessa段的新证据(意大利)
Contessa剖面是地中海早中新世的参考剖面。沿着这条36米厚的剖面收集和分析了115个样品,用于通过Scaglia Cinerea和Bisciaro地层进行综合生物磁地层学研究。浮游有孔虫采用半定量分析,钙质纳米化石采用标准定量分析方法。然后完成了两个化石组的可靠生物分区。古地磁分析确定了一系列磁带,然后利用钙质浮游生物事件与ATNTS进行了关联。研究区间从有孔虫带P22 (Chattian)延伸至MMi2c (burdigian),从钙质纳米化石带MNP25a延伸至MNN3a,即从C7An至C5En。因此,该剖面的年代跨度为24.80 Ma至18.10 Ma。沿剖面可识别出三个间断:H1在距离基底0.63 m处(包括24.36 Ma至23.38 Ma的最小时间间隔),H2在12.33 m处(21.80 Ma至21.35 Ma)和H3在34.03 (19.21 Ma至18.40 Ma)。所有三个断裂都与北大西洋和帕拉提提斯地区发现的区域性大断裂相关。此外,在chronc6an中首次发现了钙质纳米化石——放大螺旋球。2n,距基地19.77米(火山碎屑Raffaello层上方6米)。根据文献,这一事件暂时定义了阿基坦尼亚/布尔迪亚边界。因此,Contessa剖面是burdigalian全球地层剖面和点定义的可能候选剖面。最后,在这个新的综合地层格架中讨论了Raffaello层(早中新世的区域标志层)的年龄,它落在C6AAn,年龄在21.09 ~ 21.08 Ma之间。
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来源期刊
Italian Journal of Geosciences
Italian Journal of Geosciences GEOSCIENCES, MULTIDISCIPLINARY-
CiteScore
2.90
自引率
11.10%
发文量
25
审稿时长
>12 weeks
期刊介绍: The Italian Journal of Geosciences (born from the merging of the Bollettino della Società Geologica Italiana and the Bollettino del Servizio Geologico d''Italia) provides an international outlet for the publication of high-quality original research contributions in the broad field of the geosciences. It publishes research papers, special short papers, review papers, discussion-and-replies for their rapid distribution to the international geosciences community. The journal is firstly intended to call attention to the Italian territory and the adjacent areas for the exceptional role they play in the understanding of geological processes, in the development of modern geology and the Earth sciences in general. The main focus of the journal is on the geology of Italy and the surrounding sedimentary basins and landmasses, and on their relationships with the Mediterranean geology and geodynamics. Nevertheless, manuscripts on process-oriented and regional studies concerning any other area of the World are also considered for publication. Papers on structural geology, stratigraphy, sedimentology, basin analysis, paleontology, ecosystems, paleoceanography, paleoclimatology, planetary sciences, geomorphology, volcanology, mineralogy, geochemistry, petrology, geophysics, geodynamics, hydrogeology, geohazards, marine and engineering geology, modelling of geological process, history of geology, the conservation of the geological heritage, and all related applied sciences are welcome.
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