INVESTIGATING THE SEDIMENTOLOGICAL CHANGES DURING THE EARLY PLEISTOCENE ON THE CHILEAN CONTINENTAL SHELF SOUTH OF THE FALKLAND ISLANDS
Our research will continue to investigate this question by using a combination of shipboard data and weight percentages of ice rafted detritus (IRD) to identify paleoclimate indicators of the early Pleistocene from IODP Site U1534. Our interval is located approximately 89 (~2.3 my) to 120 mbsf (~2.6 my) with an average sedimentation rate of 1 cm per 1,000 years. The time frame is poorly dated due to a lack of paleomagnetic reversals. As a result, dating was primarily done through diatom biostratigraphy. The samples are located within Lithostratigraphic Unit II, which is dominated by biosilica-bearing to biosilica-rich dark greenish gray and very dark greenish gray silty clays, with quartz taking up more than 50% of the terrigenous fraction. Feldspars, micas, and glauconite minerals are also highly present at the interval. After analyzing the b*, natural gamma radiation (NGR), and gamma ray attenuation (GRA) within our samples, the data suggests a higher sedimentation rate below 106 mbsf with an inflection point once it reaches around 111 mbsf. Understanding the subtle effect of Earth’s orbit on climate and glacial cycles is crucial to understanding not only the past but the future of both the Greenland and Antarctic ice sheets.