(Table 1) Major and trace elements of sediment core CRP-3 ...
The CRP-3 core, drilled in western McMurdo Sound in October and November 1999, penetrated 823 m of lower Oligocene (to possibly upper Eocene) glacially influenced sediments. The palaeoclimatic record of CRP-3 is examined using major element analyses of bulk core samples of fine grained sediments (mu...
Main Authors: | , |
---|---|
Format: | Dataset |
Language: | English |
Published: |
PANGAEA
2001
|
Subjects: | |
Online Access: | https://dx.doi.org/10.1594/pangaea.484982 https://doi.pangaea.de/10.1594/PANGAEA.484982 |
Summary: | The CRP-3 core, drilled in western McMurdo Sound in October and November 1999, penetrated 823 m of lower Oligocene (to possibly upper Eocene) glacially influenced sediments. The palaeoclimatic record of CRP-3 is examined using major element analyses of bulk core samples of fine grained sediments (mudstones and siltstones) and the Chemical Index of Alteration (CIA) of Nesbitt & Young (1982, doi:10.1038/299715a0). The CIA is calculated from the molar abundances of Al, K, Ca, and Na oxides, and its magnitude increases as the effects of chemical weathering increase. However, changes in sediment provenance can also affect the CIA, so provenance changes have been evaluated by examining the Al2O3/TiO2 ratios and the Sr and Nb contents of the CRP-3 mudstones.Relatively low Nb contents (<20 ppm) and relatively high Al2O3/TiO2 ratios (generally >15) indicate that little or no McMurdo Volcanic Group detritus was incorporated in these sediments. Instead, these sediments appear to be mixtures of Beacon ... : Supplement to: Krissek, Lawrence A; Kyle, Philip R (2001): Geochemical indicators of weathering, Cenozoic palaeoclimates and provenance in fine-grained sediments from CRP-3, Victoria Land Basin, Antarctica. Terra Antartica, 8(4), 561-568 ... |
---|