Nummulitids, Lepidocyclinids and strontium isotope stratigraphy of the Porto Badisco Calcarenite (Salento Peninsula, southern Italy). Implications for the biostratigraphy and paleobiogeography of Oligocene larger benthic foraminifera

IF 1 4区 地球科学 Q4 GEOSCIENCES, MULTIDISCIPLINARY
M. Parente, G. Less
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引用次数: 3

Abstract

The Oligocene Porto Badisco Calcarenite (Apulian Carbonate Platform, southern Italy) contains very rich and diverse assemblages of larger benthic foraminifera. In this paper we provide the first comprehensive taxonomic study of Nummulitids and Lepidocyclinids, based on a biometric approach to species identification. The largerforaminiferal assemblage is dominated by Eulepidina, Heterostegina and Spiroclypeus. Nummulites, Operculina and Nephrolepidina make a subordinate but significant contribution. The concurrent range of the larger foraminiferal species present in the Porto Badisco Calcarenite, and in particular the presence of Spiroclypeus margaritatus and of Miogypsinoides complanatus-formosensis, indicates the late Oligocene Shallow Benthic Zone (SBZ) 23. The taxonomic composition of the larger foraminiferal assemblage of the Apulian Carbonate Platform is very similar to coeval assemblages of other localities of the western Tethyan realm (southern France, southern Spain, Malta, Greece), while some typical components of the SBZ 23 assemblages, like Heterostegina assilinoides and Eulepidina dilatata, are missing in more eastern areas (Turkey, India). Strontium isotope stratigraphy gives an age of 23.6 ± 0.5 Ma for the lower part of the Porto Badisco Calcarenite, constraining the chronostratigraphic calibration of the SBZ 23 within the latest Chattian. This calibration further supports the correlation between the SBZ 23 of the European Basins biozonal scheme with the Te 4 stage of the East Indian Letter Classification.
Porto Badisco Calcarenite(意大利南部萨伦托半岛)的Nummulitids、Lepidocyclids和锶同位素地层学。渐新世大型底栖有孔虫的生物地层学和古生物地理学意义
渐新世Porto Badisco Calcarenite(意大利南部阿普利亚碳酸盐台地)包含非常丰富和多样的大型底栖有孔虫组合。在这篇论文中,我们首次基于生物识别方法对Nummulitids和Lepidocyclids进行了全面的分类学研究。大型孔虫组合以真孔虫属、异孔虫属和尖孔虫属为主。Nummulites、Operculina和Nephroplepidina作出次要但重要的贡献。Porto Badisco Calcarenite中存在的较大有孔虫物种的同时分布范围,特别是Spiroclypus margaritatus和Miogypsinoides complanatus formosensis的存在,表明了渐新世晚期浅海底带(SBZ)23。阿普利亚碳酸盐岩平台较大有孔虫组合的分类组成与特提斯地区西部其他地区(法国南部、西班牙南部、马耳他、希腊)的同时代组合非常相似,而SBZ 23组合的一些典型组成部分,如似似assilinoide异石藻和膨胀Eulepidina,在更东部地区(土耳其、印度)失踪。锶同位素地层学给出了Porto Badisco Calcarenite下部的年龄为23.6±0.5 Ma,限制了SBZ 23在最新查特期内的年代地层标定。该校准进一步支持了欧洲盆地生物带方案的SBZ 23与东印度字母分类的Te 4阶段之间的相关性。
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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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