Mineralogy of sediment core CRP-1

• Main Author: Ehrmann, Werner
• Format: Dataset
• Language: English
• Published: PANGAEA 1998
• Subjects: 16 km ENE Cape Roberts; Amphibole/standard ratio; Cape Roberts Project; Core wireline system; CRP; CRP-1; CWS; DEPTH; sediment/rock; Feldspar/standard ratio; Grain size; sieving/settling tube; Kalifeldspar/Plagioclase ratio; Kalifeldspar/standard ratio; off Cape Roberts; Ross Sea; Antarctica; Opal-CT/standard ratio; Plagioclase/standard ratio; Pyroxene/standard ratio; Quartz/Feldspar ratio; Quartz/standard ratio; Sampling/drilling ice; Sand; X-ray diffraction (XRD); Zeolite/standard ratio; Cape Roberts; McMurdo Sound; Transantarctic Mountains; Antarc*
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.54628; https://doi.org/10.1594/PANGAEA.54628

The mineralogy of the lower Miocene and Quaternary sediments of the drillcore CRP-1 (McMurdo Sound, Ross Sea, Antarctica) has been analysed using the X-ray diffraction method. Quartz, plagioclase feldspars, K-feldspars are the most important non-clay minerals. Amphiboles occur throughout the core in minor amounts. The composition of the sediments points to an origin in the Transantarctic Mountains for the majority of the detrital components. There, the plutonic and metamorphic rocks of the basement, the sediments of the Beacon Supergroup and the volcanic rocks of the Ferrar Dolerite could serve as possible source lithologies. The quartz abundance is strongly linked to the gain size of the sediments with maxima correlating with coarse gain sizes. The downcore distribution of the other detrital minerals is relatively invariable, and does not indicate a major change in the source area during the time represented by the CRP-1 sediments. Some diagenetic alteration of the sediments is indicated by the occurrence of minor amounts of opal-CT and by some clinoptilolite below110 m depth.