Stable isotope composition and ice rafted debris in early Late Pliocene sediments from Maud Rise, South Atlantic ...

• Main Authors: Warnke, Detlef A, Marzo, Bonnie, Hodell, David A
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 1996
• Subjects: Drilling/drill rig; Leg114; Joides Resolution; Ocean Drilling Program ODP; Antarc*; Antarctica; East Antarctica; Neogloboquadrina pachyderma
• Online Access: https://dx.doi.org/10.1594/pangaea.681724; https://doi.pangaea.de/10.1594/PANGAEA.681724

We have conducted an integrated study of ice-rafted debris (IRD) and oxygen isotopes (measured on Cibicides, Globigerina bulloides, and Neogloboquadrina pachyderma, using identical samples). We used samples from the early Late Pliocene Gauss Chron from ODP Site 114-704 on the Meteor Rise in the subantarctic South Atlantic. During the early Gauss Chron, the oxygen isotopic ratios are generally up to 0.5‰-0.6‰ less than their respective Holocene values. The lowest values in this record can accommodate a warming of about 2.5°C or a sea-level rise of about 50 m, but not both, and probably result from some warming and a small reduction in global ice volume. Starting with isotope stage MG2 [ 3.23 Ma on the Berggren et al. ( 1985) time scale; 3.38 on the Shackleton et al. ( 1995b) time scale] oxygen-isotopic values generally increase (and oscillate about a Holocene mean). The first significant IRD appears at the same time. There is a subsequent increase in IRD amounts upsection. In order to reach the site, this ... : Supplement to: Warnke, Detlef A; Marzo, Bonnie; Hodell, David A (1996): Major deglaciation of east Antarctica during the early Late Pliocene? Not likely from a marine perspective. Marine Micropaleontology, 27(1-4), 237-251 ...