Sequence stratigraphy of the ANDRILL AND-2A drillcore, Antarctica: A long-term, ice-proximal record of Early to Mid-Miocene climate, sea-level and glacial dynamism

• Published in: Palaeogeography, Palaeoclimatology, Palaeoecology
• Main Authors: Fielding, C. R., Browne, G. H., Field, B., Florindo, F., Harwood, D. M., Krissek, L. A., Levy, R. H., Panter, K. S., Passchier, S., Pekar, S. F.
• Other Authors: Fielding, C. R.; Department of Earth & Atmospheric Sciences, 214 Bessey Hall, University of Nebraska-Lincoln, NE 68588-0340, USA, Browne, G. H.; GNS Science, P.O. Box 30368, Lower Hutt, New Zealand, Field, B.; GNS Science, P.O. Box 30368, Lower Hutt, New Zealand, Florindo, F.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia, Harwood, D. M.; Department of Earth & Atmospheric Sciences, 214 Bessey Hall, University of Nebraska-Lincoln, NE 68588-0340, USA, Krissek, L. A.; School of Earth Sciences, Ohio State University, 125 South Oval Mall, Columbus, OH 43210, USA, Levy, R. H.; GNS Science, P.O. Box 30368, Lower Hutt, New Zealand, Panter, K. S.; Department of Geology, Bowling Green State University, Bowling Green, OH 43403, USA, Passchier, S.; Department of Earth & Environmental Sciences, Montclair State University, 252 Mallory Hall, 1 Normal Avenue, Montclair, NJ 07043, USA, Pekar, S. F.; School of Earth & Environmental Sciences, Queen's College, 65-30 Kissena Blvd., Flushing, NY 11367, USA, Department of Earth & Atmospheric Sciences, 214 Bessey Hall, University of Nebraska-Lincoln, NE 68588-0340, USA, GNS Science, P.O. Box 30368, Lower Hutt, New Zealand, Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia, School of Earth Sciences, Ohio State University, 125 South Oval Mall, Columbus, OH 43210, USA, Department of Geology, Bowling Green State University, Bowling Green, OH 43403, USA, Department of Earth & Environmental Sciences, Montclair State University, 252 Mallory Hall, 1 Normal Avenue, Montclair, NJ 07043, USA, School of Earth & Environmental Sciences, Queen's College, 65-30 Kissena Blvd., Flushing, NY 11367, USA
• Format: Article in Journal/Newspaper
• Language: English
• Published: Elsevier B.V. 2011
• Subjects: Miocene; Antarctica; Sequence stratigraphy; Cyclicity; Mid-Miocene Climatic Optimum; ANDRILL SMS project; 04. Solid Earth::04.05. Geomagnetism::04.05.06. Paleomagnetism; 04. Solid Earth::04.05. Geomagnetism::04.05.07. Rock magnetism; 04. Solid Earth::04.05. Geomagnetism::04.05.09. Environmental magnetism; Antarctic; McMurdo Sound; Victoria Land; Antarc*
• Online Access: http://hdl.handle.net/2122/7170; https://doi.org/10.1016/j.palaeo.2011.03.026

Present understanding of Antarctic climate change during the Early to Mid-Miocene, including major cycles of glacial expansion and contraction, relies in large part on stable isotope proxies from deep sea core drilling. Here, we summarize the lithostratigraphy of the ANDRILL Southern McMurdo Sound Project drillcore AND- 2A. This core offers a hitherto unavailable ice-proximal stratigraphic archive from a high-accommodation continental margin setting, and provides clear evidence of repeated fluctuations in climate, ice expansion/ contraction and attendant sea-level change over the period c. 20.2–14.2 Ma, with a more fragmentary record of Late Miocene and Pliocene time. The core is divided into seventy-four high-frequency (fourth- or fifthorder) glacimarine sequences recording repeated advances and retreats of glaciers into and out of the Victoria Land Basin. The section can be resolved into thirteen longer-term, composite (third-order) sequences, which comprise packages of higher frequency sequences that show a consistent stratigraphic stacking pattern (Stratigraphic Motif). The distribution of the six recognized motifs indicates intervals of less and more iceproximal, and temperate to subpolar/polar climate, through the Miocene period. The core demonstrates a dynamic climate regime throughout the Early to Mid-Miocene that may be correlated to some previouslyrecognized events such as the Mid-Miocene Climatic Optimum, and provides a detailed reference point from which to evaluate stable isotope proxy records from the deep-sea. Published 337-351 1.8. Osservazioni di geofisica ambientale 2.2. Laboratorio di paleomagnetismo JCR Journal restricted