Clay mineralogy on five NBP cores ...

• Main Authors: Wellner, Julia S, Anderson, John B, Ehrmann, Werner, Weaver, Fred M, Kirshner, Alexandra E, Livsey, Daniel, Simms, Alexander R
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 2012
• Subjects: Drilling/drill rig; NBP0602A; Nathaniel B. Palmer; Antarc*; Antarctic; Antarctic Peninsula; Antarctica; Ice cap; Ice Sheet; Weddell Sea
• Online Access: https://dx.doi.org/10.1594/pangaea.777615; https://doi.pangaea.de/10.1594/PANGAEA.777615

During 2006, the SHALDRIL program recovered cores of Eocene through Pliocene material at four locations in the northwestern Weddell Sea, each representing a key period in the evolution of the Antarctic Peninsula ice cap. The recovered cores are not continuous, yet they provide a record of climate change with samples from the late Eocene, late Oligocene, middle Miocene, and early Pliocene and represent the only series of samples recovered from the northwestern Weddell Sea and spanning the Cenozoic and the initial growth of the peninsula ice cap. Late Eocene sediments sampled in the James Ross Basin are typically characterized by very dark greenish-gray muddy fine sand with some preserved burrowing and are interpreted to represent a shallow water continental shelf setting. Rare dropstones, primarily of well-cemented sandstones and minor ice-rafted material consisting of angular grains with glacially influenced surface features record the onset of mountain glaciation, the earliest such evidence in the region. ... : Supplement to: Wellner, Julia S; Anderson, John B; Ehrmann, Werner; Weaver, Fred M; Kirshner, Alexandra E; Livsey, Daniel; Simms, Alexander R (2011): History of an evolving ice sheet as recorded in SHALDRIL cores from the Northwestern Weddell Sea, Antarctica. In: Anderson, J.B. & Wellner, J.S. (eds.), Tectonic, Climatic, and Cryospheric Evolution of the Antarctic Peninsula, American Geophysical Union Special Publications, 63, 131-151 ...