Geochemical analysis of minerals from sediment core CRP-2 in the Ross Sea, Antarctica, supplement to: Talarico, Franco M; Sandroni, Sonja; Fielding, Christopher R; Atkins, Cliff (2000): Variability, petrography and provenance of basement clasts in core from CRP-2/2A, Victoria Land Basin, Antarctica. Terra Antartica, 7(4), 529-544

Distribution patterns, petrography, whole-rock and mineral chemistry, and shape and fabric data are described for the most representative basement lithologies occurring as clasts (granule to bolder grain-size class) from the 625 m deep CRP-2/2A drillcore. A major change in the distribution pattern of the clast types occurs at c. 310 mbsf., with granitoid-dominated clasts above and mainly dolerite clasts below; moreover, compositional and modal data suggest a further division into seven main detrital assemblages or petrofacies. In spite of this variability, most granitoid pebbles consist of either pink or grey biotite±hornblende monzogranites. Other less common and ubiquitous lithologies include biotite syenogranite, biotite-hornblende granodiorite, tonalite, monzogranitic porphyries (very common below 310 mbsf), microgranite, and subordinately, monzogabbro, Ca-silicate rocks, biotite-clinozoisite schist and biotite orthogneiss (restricted to the pre-Pliocene strata). The ubiquitous occurrence of biotite±hornblende monzogranite pebbles in both the Quaternary-Pliocene and Miocene-Oligocene sections, apparently reflects the dominance of these lithologies in the onshore basement, and particularly in the Cambro-Ordovician Granite Harbour Igneous Complex which forms the most extensive outcrop in southern Victoria Land. The petrographical features of the other CRP-2/2A pebble lithologies are consistent with a supply dominantly from areas of the Transantarctic Mountains facing the CRP-2/2A site, and they thus provide further evidence of a local provenance for the supply of basement clasts to the CRP-2/2A sedimentary strata.

Metadata Access
Creator Talarico, Franco M; Sandroni, Sonja; Fielding, Christopher R; Atkins, Cliff
Publisher PANGAEA - Data Publisher for Earth & Environmental Science
Publication Year 2000
Rights Creative Commons Attribution 3.0 Unported
OpenAccess true
Language English
Resource Type Supplementary Collection of Datasets
Format application/zip
Size 6 datasets
Discipline Earth System Research
Spatial Coverage (163.719 LON, -77.006 LAT); off Cape Roberts, Ross Sea, Antarctica
Temporal Coverage Begin 1998-10-01T00:00:00Z
Temporal Coverage End 1998-11-25T14:20:00Z