ODP1090: Marine core ODP1090

In mcrucifix/pleistocene: Datasets of glacial cycles (ice and ocean)

Usage

data(ODP1090)

Format

A data frame on the following variables. ...

Details

Site 1090 is also located on the Agulhas Ridge at 42d54.8'S, 8d54'E in a water depth of 3702 m (Fig. F1). A composite oxygen isotope record was developed at the location of ODP Site 1090 by splicing piston core TTN057-6-PC4 and Site 1090 at ~12.1 mcd (Fig. F8). The piston core was collected during the site survey cruise for Leg 177 and is at same position as Site 1090. The piston core has a complete record through MIS 12 (~440 ka) (Hodell et al., 2000) with sedimentation rates averaging 3 cm/k.y. The piston core was sampled at an interval of every 3 cm, yielding a temporal resolution of one sample every 1000 yr. The composite section of Site 1090 was sampled at 5-cm intervals (beginning at ~9 mcd to provide overlap with core TTN057-6), resulting in an average sampling frequency of one sample per 3 k.y. for the 2.8-m.y. record (Venz and Hodell, 2002). Sedimentation rates average ~3 cm/k.y. in the Pleistocene (0 to ~1.2 Ma), resulting in temporal resolution of one sample every 2 k.y. Prior to 1.2 Ma, sedimentation rates were lower (average = ~1.2 cm/k.y.) and yielded an average sampling frequency of one sample per 4 k.y.

Stable isotopes were measured on the benthic foraminifer Cibicidoides wuellerstorfi and Cibicidoides kullenbergi as well as the planktonic foraminifer Globigerina bulloides (Table T4) (Hodell et al., 2000; Venz and Hodell, 2002). Tests of Cibicidoides were picked from the >212-micro-m size fraction, and one to three individuals were used for analysis. Specimens of G. bulloides were selected from the >212- to <300-micro-m size fraction, and eight to ten individuals were used for analysis.

For the last 450 k.y., the age model for the core TTN057-6/Site 1090 composite was derived by correlating the 18O signal to Site 607 using the modified timescale of Mix et al. (1995). The correlation of the core TTN057-6/Site 1090 oxygen isotopic record to the reference signals is good at the stage level for the last 2 m.y. (Fig. F9), although brief hiatuses occur in the Pleistocene (Table T5). Correlation between ~2.0 and 2.9 Ma is less certain owing to low sedimentation rates, hiatuses, and the absence of Cibicidoides in some samples.

Note

Details on the age-calibration procedure are given the the Venz and Hodell reference below

Source

Original version at http://odp.pangaea.de/publications/177_SR/VOLUME/TABLES/SR177_09/09_T04.TXT

References

1Hodell, D.A., Charles, C.D., Curtis, J.H., Mortyn, P.G., Ninnemann, U.S., and Venz, K.A., 2003. Data report: Oxygen isotope stratigraphy of ODP Leg 177 Sites 1088, 1089, 1090, 1093, and 1094. In Gersonde, R., Hodell, D.A., and Blum, P. (Eds.), Proc. ODP, Sci. Results, 177. Available from World Wide Web: <http://www-odp.tamu.edu/publications/177_SR/chap_09/chap_09.htm>. doi:10.2973/odp.proc.sr.177.120.2003. Pdf available at : http://odp.pangaea.de/publications/177_SR/VOLUME/CHAPTERS/SR177_09.PDF

Venz, K.A., and Hodell, D.A., 2002. New evidence for changes in Plio-Pleistocene deep water circulation from Southern Ocean ODP Leg 177 Site 1090. Palaeogeogr., Palaeoclimatol., Palaeoecol., 182:197-220. doi:10.1016/S0031-0182(01)00496-5

Examples

## plot latest five G-I cycles
data(ODP1089)
with (ODP1089,plot(Age.ka.,d18O.Cibicidoides..permil.,type='b'))

mcrucifix/pleistocene documentation built on May 22, 2019, 3:20 p.m.