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Marino, Maria; Flores, José-Abel (2002): Middle Eocene to early Oligocene calcareous nannofossil datums of ODP Hole 177-1090B from the northen flank of the Agulhas Ridge, South Atlantic (Table 1,2). PANGAEA,, Supplement to: Marino, M; Flores, J-A (2002): Middle Eocene to early Oligocene calcareous nannofossil stratigraphy at Leg 177 Site 1090. Marine Micropaleontology, 45(3-4), 383-398,

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Semi-quantitative and quantitative analyses on nannofossil assemblages were carried out on the middle Eocene to early Oligocene interval of Site 1090 Hole B; several biozones were recognized according to the schemes of Martini (1971), Okada and Bukry (1980) and Wei and Wise (1990a), between the FO of Reticulofenestra reticulata and the LO of Reticulofenestra umbilica. Based on nannofossil biostratigraphy, our proposed interpretation of shipboard magnetic inclination data recognizes magnetic chrons from C12 to C19, according to the geomagnetic polarity time scale of Berggren et al. (1995). The Eocene/Oligocene boundary is placed between the last occurrences of Reticulofenestra oamaruensis and Discoaster saipanensis, within Chron C13r. On the basis of the correlation between magnetostratigraphy and biostratigraphy, a new biochronology is proposed for some nannofossil events. The age of FO of Reticulofenestra circus was estimated at 33.39 Ma; no previous biochronology is available in the literature for this event. An age-depth curve is constructed on the basis of the correlation between nannofossil biostratigraphy and the GPTS of Berggren et al. (1995). A very low value of sedimentation rate (0.5 m/Ma) characterizes the upper part of the study site, from the last occurrence of Ericsonia formosa to the last occurrence of R. umbilica. The presence of a hiatus or a condensed interval may occur at this level. It may be related to the mid-Oligocene Marshall Paraconformity and the inception of the Antarctic Circumpolar Current, which contributed to the modification of the nannoflora composition and sedimentation in this sector of the South Ocean.
Latitude: -42.913700 * Longitude: 8.899700
Date/Time Start: 1997-12-26T15:22:00 * Date/Time End: 1997-12-28T14:55:00
Minimum DEPTH, sediment/rock: 212.74 m * Maximum DEPTH, sediment/rock: 360.85 m
177-1090B * Latitude: -42.913700 * Longitude: 8.899700 * Date/Time Start: 1997-12-26T15:22:00 * Date/Time End: 1997-12-28T14:55:00 * Elevation: -3699.4 m * Penetration: 397.5 m * Recovery: 373.23 m * Location: South Atlantic Ocean * Campaign: Leg177 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 43 cores; 397.5 m cored; 0 m drilled; 93.9 % recovery
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1DEPTH, sediment/rockDepthmGeocode
2Depth, compositeDepth compmcdMarino, Maria
3Sample code/labelSample labelMarino, MariaDSDP/ODP/IODP sample designation
4Sample code/label 2Sample label 2Marino, MariaDSDP/ODP/IODP sample designation
5Ageprofile Datum DescriptionAgeprof dat desMarino, MariaFO = first occurence, LO = last occurence
6Age modelAge modelkaMarino, MariaAge model, biostratigraphycompared to Berggren et al (1995)
7ChronozoneChronozoneMarino, Mariacompared to Berggren et al (1995)
88 data points

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