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首页> 外文期刊>Stratigraphy >Integrated stratigraphy of St. Peter's Pool section (Malta): new age for the Upper Globigerina Limestone member and progress towards the Langhian GSSP
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Integrated stratigraphy of St. Peter's Pool section (Malta): new age for the Upper Globigerina Limestone member and progress towards the Langhian GSSP

机译：圣彼得池地带（马耳他）的综合地层学：格洛比吉纳纳石灰石上游成员的新纪元，并向着朗吉安GSSP迈进

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摘要

The St. Peter's Pool section, that outcrops at Deli mara Peninsula (south-eastern part of Malta Island), belongs to the Upper Globigerina Limestone, the youngest member of the Globigerina Limestone formation. The high resolution integrated study performed on it revealed the great potentiality of this section for a further development of the Mediterranean Langhian biostratigraphy and for a better understanding of the geology of the Maltese Archipelago. Calcareous plankton quantitative analyses allowed the definition of several bioevents with a great potential for biostratigraphic studies. Some of them are already well-known, such as the Helicosphera ampliaperta LCO (Last Common Occurrence), the paracme interval of Sphenolithus heteromorphus and the Acme_a interval of Paragloborotalia siakensis, while the potential of Paragloborotalia bella LCO and the P. siakensis Acme_0 are documented for the first time in the Mediterranean area. Other bioevents were recognized through qualitative analyses, such as the Paragloborotalia acrostoma LO (Last Occurrence), the Globigerinoides sicanus FO (First Occurrence), the Paragloborotalia birnageae LO, the Globorotalia mariae mariae FO and the P. bella LO. The St. Peter's Pool section is characterized by a continuous sedimentation from the upper part of MMi3 Zone to the lower part of MMi4c Subzone of planktonic foraminiferal zonation of Di Stefano et al. (2008) and from the uppermost part of MNN4a Zone to the lower part of MNN5a Zone of calcareous nannofossil zonation (Di Stefano et al. 2008). The magnetostratigraphic interpretation, though rather uncertain, enabled us to identify the C5Cn-05Br interval. On the basis of the bio-magnetostratigraphic events recognized in the St. Peter's Pools section, we were able: i) to date the base of the Upper Globigerina Limestone member outcropping in the Deli mara Peninsula; ii) to obtain the Burdigalian age for the Upper Globigerina Limestone member, that is the oldest ever recognized in the Maltese Archipelago and iii) to propose this section as potential candidate for the definition of the Langhian GSSP (Global Stratotype Section and Point), thanks to the high quality of calcareous plankton content, the deep paleoenvironmental setting, the suitability for future cyclostratigraphic studies and, finally, the easy accessibility to the outcrops.
机译：在彼得马鲁半岛（马耳他岛的东南部）露头的圣伯多禄池地段属于上比洛比里纳石灰岩上层，是比洛比里纳石灰岩地层中最年轻的成员。在其上进行的高分辨率综合研究显示了该部分对于进一步发展地中海朗吉亚生物地层学和更好地了解马耳他群岛地质的巨大潜力。钙质浮游生物的定量分析可以定义几种具有生物地层学潜力的生物事件。其中一些已经众所周知，例如Helicosphera ampliaperta LCO（最后一次发生），Sphenolithus heteromorphus的paracme区间和Saragloborotalia siakensis的Acme_a区间，而Paragloborotalia bella LCO和P. siakensis Acme_0的潜力已被记录下来。第一次在地中海地区。其他生物事件也通过定性分析得到了认可，例如副球果高发（Last Occurrence），副球菌Globigerinoides sicanus FO（首次发生），副球志高产的Paragloborotalia birnageae LO，海事Gloglotalia mariae mariae和P. bella LO。 Di Stefano等人的浮游有孔虫地带从MMi3区的上部到MMi4c子区的下部连续沉积是圣彼得池段的特征。 （2008年）以及钙质纳米化石带从MNN4a区的最上部到MNN5a区的下部（Di Stefano等，2008）。磁地层学解释虽然相当不确定，但使我们能够确定C5Cn-05Br区间。根据圣彼得池地带认识到的生物磁性地层学事件，我们能够：i）迄今为止，在德利玛拉半岛露头的上比洛比里纳纳石灰石成员的地基至今; ii）获得上古格洛比里纳石灰石成员的布尔迪加尔年龄，这是马耳他群岛有史以来最古老的成员，并且iii）建议本节作为朗格安GSSP（全球层位剖面和断面）定义的潜在候选者，谢谢钙质浮游生物含量高，古环境深厚，适合将来的旋回地层学研究，以及最终容易到达露头。

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