Miocene nannofossil chronology in the North Atlantic, DSDP Site 608

Gartner, Stefan

doi:10.1016/0377-8398(92)90045-l

Cited by 76 publications

(79 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The lowermost observed specimen is at 113.20 m, corresponding to the astronomical age of 9.823 Ma. This weak biostratigraphic signal is in agreement with the D. neohamatus distribution at Site 608 (Gartner, 1992), where the species is recorded as very rare within the range of D. hamatus, in the upper part of Chron 5n.2n. In the equatorial Atlantic, D. neohamatus is rare within the range of D. hamatus, and increases in abundance between 9.80 and 9.77 Ma (Backman and Raffi, 1997); this age is in agreement with the age obtained at Monte Gibliscemi, considering the scattered distribution of the species.…”

Section: Presences Of Discoaster Bellus Gr Discoaster Hamatus and Dsupporting

confidence: 87%

“…5 and 6; Plate 5, 6 and 7) in section Gibliscemi shows affinity with its distribution in the western equatorial Atlantic (Backman and Raffi, 1997) and mid-latitude Atlantic DSDP Site 608 (Olafsson, 1991;Gartner, 1992). At this latter site the disappearance event of C. miopelagicus occupies the same stratigraphic position relative to the D. hamatus first occurrence (FO; sensu Olafsson, 1991) as in section Gibliscemi.…”

Section: Lro Of Coccolithus Miopelagicusmentioning

confidence: 79%

“…The same distribution was recorded in the western equatorial Atlantic, where the D. hamatus FO was astronomically dated at 10.47 Ma (Backman and Raffi, 1997). Their magnetostratigraphically calibrated positions were precisely established in the middle part of Subchron 5n.2n in the eastern tropical Pacific (Leg 138 sites, , and in the North Atlantic (Site 608: Olafsson, 1991;Gartner, 1992), where the first rare specimens of D. hamatus were detected within 5n.2n as well; at this site, the taxon increases in abundance close to the top of Chron 5n, with an approximate age of 10.05-10.06 Ma (using the timescale of Hilgen et al, 1995). The astronomical age of 10.150 Ma obtained for the lowermost observed specimens of D. hamatus at Gibliscemi is, despite its highly sporadic occurrence in the section, in agreement with the re-calibrated age obtained for the D. hamatus FO as defined by Olafsson (1991) at Site 608.…”

Section: Presences Of Discoaster Bellus Gr Discoaster Hamatus and Dmentioning

confidence: 99%

See 2 more Smart Citations

Integrated stratigraphy and astronomical calibration of the Serravallian/Tortonian boundary section at Monte Gibliscemi (Sicily, Italy)

Hilgen

Krijgsman²,

Raffi

et al. 2000

Marine Micropaleontology

117

148

View full text Add to dashboard Cite

Results are presented of an integrated stratigraphic (calcareous plankton biostratigraphy, cyclostratigraphy and magnetostratigraphy) study of the Serravallian=Tortonian (S=T) boundary section of Monte Gibliscemi (Sicily, Italy). Astronomical calibration of the sedimentary cycles provides absolute ages for calcareous plankton bio-events in the interval between 9.8 and 12.1 Ma. The first occurrence (FO) of Neogloboquadrina acostaensis, usually taken to delimit the S=T boundary, is dated astronomically at 11.781 Ma, pre-dating the migratory arrival of the species at low latitudes in the Atlantic by almost 2 million years. In contrast to delayed low-latitude arrival of N. acostaensis, Paragloborotalia mayeri shows a delayed low-latitude extinction of slightly more than 0.7 million years with respect to the Mediterranean (last occurrence (LO) at 10.49 Ma at Ceara Rise; LO at 11.205 Ma in the Mediterranean). The Discoaster hamatus FO, dated at 10.150 Ma, is clearly delayed with respect to the open ocean. The ages of D. kugleri first and last common occurrence (FCO and LCO), Catinaster coalitus FO, Coccolithus miopelagicus last (regular) occurrence (L(R)O) and the D. hamatus=neohamatus cross-over, however, are in good to excellent agreement with astronomically tuned ages for the same events at Ceara Rise (tropical Atlantic), suggesting that both independently established timescales are consistent with one another. The lack of a reliable magnetostratigraphy hampers a direct comparison with the geomagnetic polarity timescale of Cande and Kent (1995; CK95), but ages of calcareous nannofossil events suggests that CK95 is significantly younger over the studied time interval. Approximate astronomical ages for the polarity reversals were obtained by exporting astronomical ages of selected nannofossil events from Ceara Rise (and the Mediterranean) to eastern equatorial Pacific ODP Leg 138 Site 845, which has a reliable magnetostratigraphy.Our data from the Rio Mazzapiedi-Castellania section reveal that the base of the Tortonian stratotype corresponds almost exactly with the first regular occurrence (FRO) of N. acostaensis s.s. as defined in the present study, dated at 10.554 Ma. An extrapolated age of 11.8 Ma calculated for the top of the Serravallian stratotype indicates that there is a gap between the top of the Serravallian and the base of the Tortonian stratotype, potentially rendering all bio-events in the interval between 11.8 and 10.554 Ma suitable for delimiting the S=T boundary. Despite the tectonic deformation and the lack of a magnetostratigraphy, Gibliscemi remains a candidate to define the S=T boundary by means of the Tortonian global boundary stratotype section and point (GSSP). © 2000 Elsevier Science B.V. All rights reserved.Ł Corresponding author. E-mail: fhilgen@geo.uu.nl 0377-8398/00/$ -see front matter © 2000 Elsevier Science B.V. All rights reserved. PII: S 0 3 7 7 -8 3 9 8 ( 0 0 ) 0 0 0 0 8 -6 182 F.J. Hilgen et al. / Marine Micropaleontology 38 (2000)

show abstract

Section: Presences Of Discoaster Bellus Gr Discoaster Hamatus and Dsupporting

confidence: 87%

Section: Lro Of Coccolithus Miopelagicusmentioning

confidence: 79%

Section: Presences Of Discoaster Bellus Gr Discoaster Hamatus and Dmentioning

confidence: 99%

See 1 more Smart Citation

Integrated stratigraphy and astronomical calibration of the Serravallian/Tortonian boundary section at Monte Gibliscemi (Sicily, Italy)

Hilgen

Krijgsman²,

Raffi

et al. 2000

Marine Micropaleontology

117

148

View full text Add to dashboard Cite

show abstract

“…reticulofenestrids having the long axis smaller than 3 µm, has been observed by several authors (Backman, 1978;Flores and Sierro, 1987;Gartner, 1992;Sierro et al, 1993). This increase is observed within subzone CN9a between the D. berggrenii and A. primus FO's.…”

Section: Acme Begin (Ab) and Acme Top (At) Of 'Small' Reticulofenestridssupporting

confidence: 64%

“…For instance, Negri and Vigliotti (1997) and Krijgsman et al (1997) recognize only the FO of Amaurolithus spp. in previous studies of the Monte del Casino section while Gartner (1992) recorded the Amaurolithus spp. FO event (likely A. primus FO) in a magnetostratigraphically not well defined interval above Chron C4 in the North Atlantic (Fig.…”

Section: Amaurolithus Primus Fomentioning

confidence: 94%

Calcareous nannofossil biostratigraphy of the M. del Casino section (northern Apennines, Italy) and paleoceanographic conditions at times of Late Miocene sapropel formation

Negri

Giunta

Hilgen

et al. 1999

Marine Micropaleontology

View full text Add to dashboard Cite

A detailed quantitative calcareous nannofossil analysis has been performed on 138 samples from the astronomically dated Monte del Casino section with the aim to identify and precisely date the most important calcareous nannofossil events across the Tortonian=Messinian boundary in the Mediterranean, and to unravel paleoceanographic conditions at times of sapropel formation during the Late Miocene. From the biostratigraphic perspective, the genus Amaurolithus provides three successive first occurrences (FOs): A. primus, A. cf. amplificus and A. delicatus, dated at 7.446, 7.434 and 7.226 Ma, respectively. Other bioevents include the base and top of the 'small reticulofenestrids' Acme, dated at 7.644 and 6.697 Ma, and the FO, FCO and LO of R. rotaria, dated at 7.405, 7.226 and 6.771 Ma. These events appear to be useful in improving biostratigraphic resolution in the Tortonian-Messinian boundary interval, at least for the Mediterranean. Quantitative analysis revealed changes in the calcareous nannofossil assemblage associated with the sapropels. The observed fluctuations suggest a single mechanism for sapropel formation in the Mediterranean during the late Neogene. Sapropels are characterized by a decrease in the total number of coccoliths, interpreted mainly as a reduction in calcareous nannofossil production due to increased siliceous plankton production during spring blooms; and an increase in reworked specimens, interpreted to reflect enhanced continental input via river run-off. An increase in abundance of the genus Rhabdosphaera can be explained by opportunistic behavior at the end of the spring bloom when nutrient levels start to become impoverished. As far as sea surface water temperature indicators are concerned, warm water D. pentaradiatus shows positive fluctuations in sapropels while cooler water D. intercalaris and C. pelagicus show negative fluctuations.

show abstract

The Lombardian Gonfolite Group in central Brianza (Como and Milano Provinces, Italy): Calcareous nannofossil biostratigraphy and sedimentary record of neo-alpine tectonics

Sciunnach

Tremolada

2004

Eclogae geol. Helv.

View full text Add to dashboard Cite

The sedimentary succession cropping out in central Brianza, in an area embracing the territories of Besana Brianza, Briosco (Milan Province), Arosio and Inverigo (Como Province), is properly ascribed to the Lombardian Gonfolite Group. It consists of prevailing turbidite sandstones and marls, with conglomerate beds occurring in the central part of the section.A precise biostratigraphic dating of the succession was obtained through the analysis of calcareous nannofossils. The occurrence of reliable index species allowed us to recognise the NN3 to NN6 nannoplankton zones (Burdigalian to Serravallian). Since in the type-areas between Varese and Como the youngest dated units of the Gonfolite Group are Burdigalian in age, the studied succession documents a more recent part in the history of the south-alpine foredeep, that might have been recorded in outcrop elsewhere in Lombardy only by the ill-dated Gurone Sandstone and Bizzozzero Mudstone (Varese area). The deformation of the studied succession seemingly requires a single event of tectonic buckling, that is reliably constrained as late Serravallian to Tortonian (late "Lombardic Phase").Provenance signals point to roughly contemporaneous exhumation of the Pennidic nappes and active stacking of thrust sheets in the uprising Southern Alps. This phase of tectonic activity took place around the Langhian/Serravallian boundary (early "Lombardic Phase"). RIASSUNTOLa successione sedimentaria affiorante in un piccolo settore della Brianza centrale, che abbraccia il territorio dei Comuni di Besana Brianza, Briosco (Provincia di Milano), Arosio and Inverigo (Provincia di Como), mostra una chiara appartenenza al Gruppo della Gonfolite Lombarda. Essa è rappresentata da prevalenti arenarie e marne in facies torbiditica, con strati conglomeratici limitati alla parte centrale della colonna stratigrafica.Una datazione biostratigrafica precisa della successione è stata possibile grazie all'analisi dei nannofossili calcarei. La presenza di specie-indice affidabili ci ha consentito di riconoscere le zone a nannoplancton dalla NN3 alla NN6 (Burdigaliano-Serravalliano). Poiché nelle località-tipo tra Varese e Como le unità più recenti riconosciute all'interno della Gonfolite sono burdigaliane, la successione studiata documenta uno stadio più recente nell'evoluzione dell'avanfossa sudalpina, che potrebbe essere stata registrata in altri affioramenti in Lombardia solo dalle Arenarie di Gurone e dalle Peliti di Bizzozzero (Varese), unità la cui datazione rimane tuttavia poco precisa. La deformazione della successione in esame sembra compatibile con un singolo evento di piegamento, che si può ricondurre in modo convincente al Serravalliano superiore-Tortoniano (tarda "Fase Lombarda").I segnali di provenienza indicano una sostanziale contemporaneità tra l'esumazione delle falde Pennidiche e l'impilamento attivo dei sovrascorrimenti nelle Alpi Meridionali in via di sollevamento. Questa fase di attività tettonica ebbe luogo attorno al limite Langhiano/Serravalliano ("Fase Lombarda" iniziale).

show abstract

Miocene nannofossil chronology in the North Atlantic, DSDP Site 608

Cited by 76 publications

References 14 publications

Integrated stratigraphy and astronomical calibration of the Serravallian/Tortonian boundary section at Monte Gibliscemi (Sicily, Italy)

Integrated stratigraphy and astronomical calibration of the Serravallian/Tortonian boundary section at Monte Gibliscemi (Sicily, Italy)

Calcareous nannofossil biostratigraphy of the M. del Casino section (northern Apennines, Italy) and paleoceanographic conditions at times of Late Miocene sapropel formation

The Lombardian Gonfolite Group in central Brianza (Como and Milano Provinces, Italy): Calcareous nannofossil biostratigraphy and sedimentary record of neo-alpine tectonics

Contact Info

Product

Resources

About