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首页> 外文期刊>Stratigraphy >High-resolution integrated stratigraphy of the upper Burdigalian-lower Langhian in the Mediterranean: the Langhian historical stratotype and new candidate sections for defining its GSSP
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High-resolution integrated stratigraphy of the upper Burdigalian-lower Langhian in the Mediterranean: the Langhian historical stratotype and new candidate sections for defining its GSSP

机译：地中海上布尔迪加利安-下朗格安高分辨率高分辨率地层：朗格安历史地层学和定义其GSSP的新候选剖面

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摘要

Results of high-resolution integrated stratigraphic studies (calcareous plankton and magnetostratigraphy) of three Mediterranean sections (La Vedova in Central Italy, Contrada Pesciarello in Sicily and St. Peter's Pool in Malta) and one deep-sea core from the mid-latitude North Atlantic (DSDP Hole 608) are here synthesized. They are compared with those of previously studied deep marine sections in the Mediterranean including the historical stratotype, with the aim to select the most suitable section and criterion to define the Langhian GSSP (Global Stratotype Section and Point). This study significantly improves the existing magnetobiostratigraphic framework for the upper Burdigalian-lower Langhian and opens new perspectives for defining the Langhian GSSP. An extensive review of the first stages of the Globigerinoides-Praeorbulina evolutionary lineage pointed out that the Praeorbulina datum, historically used (and/or suggested) to approximate the base of the Langhian, coincides with the First Occurrence (FO) of P. glomerosa curva instead of P. sicana which is here included in the genus Globigerinoides. The FO of P. glomerosa curva occurs close to the C5Br/C5Bn.2n reversal boundary. As a consequence, the two recommended guiding criteria to recognize the base of the Langhian, i.e. the Praeorbulina datum and the top of Chron C5Cn. I n, can not be applied together, as these two events differ in age by -740 kyr. The selection of either of these two criteria will imply a different duration for the Langhian: relatively short, in case the FO of P. glomerosa curva is selected, or longer and probably more acceptable, in case the top of Chron C5Cn. In is selected. The primary calcareous plankton biohorizons which, according to our data, appoximate the top of Chron C5Cn.ln, are the Last Common Occurrence (LCO) of the calcareous nannofossil Helicosphaera ampliaperta and the LCO of the planktonic foraminifer Paragloborotalia bella. Other calcareous plankton events have been recorded close to the same magnetic reversal, such as a short influx of H. ampliaperta (lat) and the Paragloborotalia siakensis Acme_0. The P. siakensis Acme_a End (A_aE) and the Sphenolithus heteromorphus Paracme End (PE) represent the primary plankton biohorizons associated with the P. glomerosa curva FO. Two of the three studied Mediterranean sections (La Vedova and St. Peter's Pool), each from different point of view, are potentially suitable to be proposed as candidates for the definition of the Langhian GSSP. Yet, further studies on stable isotope stratigraphy and cyclostratigraphy, including astronomical tuning are necessary before the most suitable section and guiding criterion can be selected.
机译：三个地中海地区（意大利中部的La Vedova，西西里岛的Contrada Pesciarello和马耳他的圣彼得池）以及一个来自北大西洋中纬度的深海岩心的高分辨率综合地层研究结果（钙质浮游生物和磁地层学） （DSDP孔608）在此被合成。将它们与之前在地中海深海海域中包括历史地层型的研究区进行了比较，目的是选择最合适的地层和标准来定义Langhian GSSP（全球地层型剖面和点）。这项研究显着改善了上布尔迪加利安-朗格下层的现有磁地层学框架，并为界定朗格GSSP开辟了新的前景。对球形大球藻-普拉氏球菌进化谱系的第一阶段进行了广泛的审查，指出历史上曾使用（和/或建议）近似朗根基数的普拉氏球藻基数与球形假单胞菌的首次出现（FO）相吻合。而不是此处包含在Globigerinoides属中的P. sicana。 P. glomerosa curva的FO发生在C5Br / C5Bn.2n反转边界附近。因此，这两个建议的指导标准是识别Langhian的基础，即Praeorbulina基准面和Chron C5Cn的顶部。 I n不能一起应用，因为这两个事件的年龄相差-740 kyr。这两个标准中的任何一个的选择对于Langhian而言将意味着不同的持续时间：如果选择了P. glomerosa curva的FO，则相对较短，或者如果Chron C5Cn的顶部，则更长或更可能更可接受。选择了。根据我们的数据，钙质浮游生物的主要生物水平接近Chron C5Cn.ln的顶部，是钙质纳米化石螺旋藻的最后一次出现（LCO）和浮游有孔虫副球藻的鳞状LCO。记录到的其他钙质浮游生物事件接近于相同的磁逆转，例如短时潮菌H. ampliaperta（lat）和副球藻siakensis Acme_0涌入。 siakensis Acme_a End（A_aE）和Sphenolithus heteromorphus Paracme End（PE）代表与P. glomerosa curva FO相关的主要浮游生物水平。研究的三个地中海部分中的两个（La Vedova和St. Peter's Pool）可能从不同的角度出发，很可能适合作为Langhian GSSP定义的候选者。然而，在选择最合适的剖面和指导标准之前，有必要对稳定同位素地层学和旋回地层学进行进一步研究，包括天文调谐。

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