Magnetic susceptibility and documentation of sediment cores from the Antarctic Peninsula Pacific margin


Autoria(s): Lucchi, Renata G; Rebesco, Michele; Camerlenghi, Angelo; Busetti, M; Tomadin, Luciano; Villa, Giuliana; Persico, Davide; Morigi, Caterina; Bonci, MC; Giorgetti, G
Cobertura

MEDIAN LATITUDE: -66.393696 * MEDIAN LONGITUDE: -76.907098 * SOUTH-BOUND LATITUDE: -67.286000 * WEST-BOUND LONGITUDE: -79.962500 * NORTH-BOUND LATITUDE: -64.106833 * EAST-BOUND LONGITUDE: -69.335167 * DATE/TIME START: 1997-03-02T19:09:00 * DATE/TIME END: 1997-03-15T02:41:00

Data(s)

05/12/2007

Resumo

The effects of glaciation on sediment drifts is recognised from marked sedimentary facies variation in deep sea cores taken from the continental rise of the Antarctic Peninsula Pacific margin. Nineteen sediment cores were visually described, logged for magnetic susceptibility, and X-radiographed. About 1000 analyses were performed for grain size, clay minerals and biostratigraphy (foraminifera, nannofossils and diatoms). Four sediment types associated with distinct sedimentary processes are recognised based on textural/compositional analysis. (1) Hemipelagic mud forms the bulk of the interglacial sediment, and accumulated from the pelagic settling of bioclasts and ice-rafted/windtransported detritus. (2) Terrigenous mud forms the bulk of the glacial sediment, and accumulated from a combination of sedimentary processes including turbidity currents, turbid plumes, and bottom current reworking of nepheloid layers. (3) Silty deposits occurring as laminated layers and lenses, represent the lateral spillout of lowdensity turbidity currents. (4) Lastly, glacial/interglacial gravelly mud layers derive from settling of ice-rafted detritus. Five depositional settings are interpreted within sediment Drift 7, each characterised by the dominance/interaction of one or several depositional processes. The repetitive succession of typical sedimentary facies is inferred to reflect a sequence of four climatic stages (glaciation, glacial, deglaciation, and interglacial), each one characterised by a distinctive clay mineral assemblage and bioclastic content. Variations in clay mineral assemblage within interglacial stage 5 (core SED-06) suggest minor colder climatic fluctuations, possibly correlatable with substages 5a to 5e.

Formato

application/zip, 17 datasets

Identificador

https://doi.pangaea.de/10.1594/PANGAEA.671563

doi:10.1594/PANGAEA.671563

Idioma(s)

en

Publicador

PANGAEA

Direitos

CC-BY: Creative Commons Attribution 3.0 Unported

Access constraints: unrestricted

Fonte

Supplement to: Lucchi, Renata G; Rebesco, Michele; Camerlenghi, Angelo; Busetti, M; Tomadin, Luciano; Villa, Giuliana; Persico, Davide; Morigi, Caterina; Bonci, MC; Giorgetti, G (2002): Mid-late Pleistocene glacimarine sedimentary processes of a high-latitude, deep-sea sediment drift (Antarctic Peninsula Pacific margin). Marine Geology, 189(3-4), 343-370, doi:10.1016/S0025-3227(02)00470-X

Palavras-Chave #Bartington MS2B bulk sensor; Depth; DEPTH, sediment/rock; Explorer; GC; Gravity corer; kappa; SED-11; SED-12; SED-13; SED-14; SED-15; SED-16; SED-17; SED-18; SED-19; SED-20; SEDANO-II; Susceptibility, volume; uncorrected; Uniform resource locator/link to file; URL file
Tipo

Dataset