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Radiolarian occurrences from the Jurassic-Cretaceous transition beds in the Maiolica Formation of the Bosso Valley section, Northern Apennines, central Italy
Matsuoka, Atsushi1; Li, Xin (李鑫)2,3; Chiari, Marco4; Bertinelli, Angela5
2020-10-01
Source PublicationCRETACEOUS RESEARCH
ISSN0195-6671
Volume114Pages:15
Abstract

The Global Boundary Stratotype Section and Point (GSSP) of the Jurassic-Cretaceous boundary (JKB) is the last among the GSSPs in the Phanerozoic to be chosen. The Berriasian Working Group of the International Subcommission on Cretaceous Stratigraphy decided in 2016 to use the base of the Calpionella alpina Subzone as the primary marker for the formal definition of the JKB. This definition is satisfactorily applicable for near continent, shallow offshore deposits within the Western Tethys, North Atlantic and central-south America. Unfortunately, the primary marker taxon cannot be found in the Pacific and circum-Pacific regions since the distribution of calpionellids is limited to the Western Tethys and neighboring regions. Radiolarians are good candidates for defining the JKB, because they are widespread and can be found both in shallow and deep pelagic sedimentary facies worldwide. We carried out detailed field observations and careful sample collections in a 5-m thick interval around the JKB in the Bosso Valley section (Northern Apennines), which is one of potential candidates for GSSP of the JKB. The Maiolica Formation, which includes the JKB, is characterized by white to light gray, well-bedded micritic limestones with abundant light gray to black chert layers and nodules. In this study, after selection of samples acid-etched in the field, we observed the etched surface with a scanning electron microscope in the laboratory. Our detailed observations revealed that both micritic limestone and chert generally contain abundant radiolarian tests. Most of them in limestones are replaced by calcite, so that it is impossible to isolate radiolarian tests from rock samples with acid treatment. On the other hand, radiolarian tests within chert layers or nodules are too recrystallized to preserve their original surface ornamentation. The best preserved radiolarian tests are included in micritic limestone near chert layer or nodules. Careful and systematic sampling enabled us to get enough material to establish phylogenetic analysis on radiolarians. (C) 2020 Elsevier Ltd. All rights reserved.

KeywordJurassic Cretaceous Bosso Valley section Radiolarians Preservation GSSP
DOI10.1016/j.cretres.2020.104500
Indexed BySCI
Language英语
WOS KeywordZANGBO SUTURE ZONE ; JURASSIC/CRETACEOUS BOUNDARY ; XIALU-CHERT ; UMBRIA ; BIOSTRATIGRAPHY ; CALPIONELLIDS ; STRATIGRAPHY ; STRATA
Funding ProjectJapan Society for the Promotion of Science KAKENHI[15K05329] ; Japan Society for the Promotion of Science KAKENHI[15H02142] ; Second Tibetan Plateau Scientific Expedition and Research[2019QZKK0706] ; National Natural Science Foundation of China[41802013] ; National Natural Science Foundation of China[41572188] ; National Natural Science Foundation of China[41772020] ; Strategic Priority Research Program of Chinese Academy of Sciences[XDB26000000]
WOS Research AreaGeology ; Paleontology
WOS SubjectGeology ; Paleontology
WOS IDWOS:000558723900009
Funding OrganizationJapan Society for the Promotion of Science KAKENHI ; Second Tibetan Plateau Scientific Expedition and Research ; National Natural Science Foundation of China ; Strategic Priority Research Program of Chinese Academy of Sciences
PublisherACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
Citation statistics
Document Type期刊论文
Identifierhttp://ir.nigpas.ac.cn/handle/332004/32193
Collection中国科学院南京地质古生物研究所
Corresponding AuthorLi, Xin (李鑫)
Affiliation1.Niigata Univ, Fac Sci, Niigata 9502181, Japan
2.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, State Key Lab Palaeobiol & Stratig, Nanjing 210008, Peoples R China
3.Chinese Acad Sci, Ctr Excellence Life & Paleoenvironm, 39 East Beijing Rd, Nanjing 210008, Peoples R China
4.CNR, Ist Geosci & Georisorse, Sede Secondaria, Via G La Pira 4, I-50121 Florence, Italy
5.Univ Perugia, Dipartimento Fis & Geol, Via A Pascoli Snc, I-06123 Perugia, Italy
Corresponding Author AffilicationNanjing Institute of Geology and Palaeonotology,CAS
Recommended Citation
GB/T 7714
Matsuoka, Atsushi,Li, Xin ,Chiari, Marco,et al. Radiolarian occurrences from the Jurassic-Cretaceous transition beds in the Maiolica Formation of the Bosso Valley section, Northern Apennines, central Italy[J]. CRETACEOUS RESEARCH,2020,114:15.
APA Matsuoka, Atsushi,Li, Xin ,Chiari, Marco,&Bertinelli, Angela.(2020).Radiolarian occurrences from the Jurassic-Cretaceous transition beds in the Maiolica Formation of the Bosso Valley section, Northern Apennines, central Italy.CRETACEOUS RESEARCH,114,15.
MLA Matsuoka, Atsushi,et al."Radiolarian occurrences from the Jurassic-Cretaceous transition beds in the Maiolica Formation of the Bosso Valley section, Northern Apennines, central Italy".CRETACEOUS RESEARCH 114(2020):15.
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