The Danian/Selandian boundary at Site 1262 (South Atlantic) and in the Tethyan region: Biomagnetostratigraphy, evolutionary trends in fasciculiths and environmental effects of the Latest Danian Event

被引:47
作者
Monechi, Simonetta [1 ]
Reale, Viviana [1 ]
Bernaola, Gilen [2 ]
Balestra, Barbara [1 ,3 ]
机构
[1] Univ Florence, Dipartimento Sci Terra, I-50121 Florence, Italy
[2] Univ Basque Country, Dept Min & Met Engn, E-48901 Baracaldo, Spain
[3] CUNY Queens Coll, Sch Earth & Environm Sci, Flushing, NY 11367 USA
关键词
Danian/Selandian boundary; Calcareous nannofossils; Biochronostratigraphy; Fasciculiths evolutionary trend; Latest Danian Event; South Atlantic; EOCENE THERMAL MAXIMUM; ZUMAIA BASQUE BASIN; NORTH-SEA BASIN; CALCAREOUS NANNOFOSSIL; SELANDIAN TRANSITION; LATE PALEOCENE; CRETACEOUS-PALEOGENE; LIVING COMMUNITIES; MIDDLE PALEOCENE; STABLE-ISOTOPE;
D O I
10.1016/j.marmicro.2012.11.002
中图分类号
Q91 [古生物学];
学科分类号
070903 [古生物学与地层学];
摘要
A high-resolution calcareous nannofossil analysis of the Danian/Selandian boundary was conducted at Site 1262 (Walvis Ridge, South Atlantic) to pinpoint the lowest occurrence of fasciculiths and to unravel the evolutionaty trends throughout nannofossil Zone NP4. Using quantitative analyses, numerous primary and secondary bioevents were identified, improving the biostratigraphic resolution of this interval. The main events recorded at Site 1262 were also identified at the Zumaia section Global Stratotype Section and Point (GSSP) of the base of the Selandian and at the Qreiya section (Egypt). The lowest occurrence of fasciculiths (represented by the LO of Gomphiolithus magnicordis and Gomphiolithus magnus) was observed in the middle part of Chron C27r, above the LO of Toweius pertusus and prior to the LO of the genus Sphenolithus. The synchroneity of the LO of fasciculiths was also verified at various latitudes, such as DSDP Site 384 (NW Atlantic), ODP Site 761B (Indian Ocean) and DSDP Site 577A (Pacific Ocean). The first and second diversification events (Steurbaut and Sztrakos, 2008), or radiation events (Bernaola et al., 2009), of fasciculiths have been thoroughly discussed and well characterized by a succession of events. The occurrence of the Latest Danian Event (LDE) and several paleoenvironmental changes recognized during this time intenral, coupled with an ecological competition with Sphenolithus, appear to be the probable causes of the First and Second Radiations and the fasciculith barren interval between them. The occurrence of new morphostructures and taxa suggests evolutionary trends and a strict link between morphological evolution and paleoclimate. (C) 2012 Elsevier B.V. All rights reserved.
引用
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页码:28 / 40
页数:13
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