Peak areas and heights for minerals of ODP Leg 113-696B (Table 1) ...

• Main Author: Lonsdale, Malcolm J
• Format: Dataset
• Language: English
• Published: PANGAEA 1990
• Subjects: Sample code/label; Quartz peak area; Quartz peak height; Plagioclase peak area; Plagioclase peak height; Amphibole peak area; Amphibole peak height; Olivine peak area; Olivine peak height; Opal-A peak area; Opal-A peak height; Opal-CT peak area; Opal-CT peak height; Pyrite peak area; Pyrite peak height; Chlorite peak area; Chlorite peak height; Illite peak area; Illite peak height; Halite peak area; Halite peak height; Corundum peak area; Corundum peak height; -; Drilling/drill rig; DSDP/ODP/IODP sample designation; Leg113; Joides Resolution; Ocean Drilling Program ODP; Antarc*; Antarctica
• Online Access: https://dx.doi.org/10.1594/pangaea.753957; https://doi.pangaea.de/10.1594/PANGAEA.753957

Seismic data acquired over the eastern shelf and margin of the South Orkney microcontinent, Antarctica, have shown a high-amplitude reflection lying at a sub-bottom two-way traveltime (TWT) of 0.5-0.8 s. There appear to be two causes for the reflection which apply in different parts of the shelf. The more widespread cause of the reflection is a break-up unconformity associated with the opening of Jane Basin to the east. This is clearly seen where reflections in the underlying sequence are discordant. In contrast, in Eotvos Basin and the southeastern part of Bouguer Basin, the high-amplitude reflection in places cuts across bedding and is interpreted to be caused by silica diagenesis. A post-cruise analysis of core samples from Site 696 in Eotvos Basin by X-ray diffraction (XRD) and scanning electron microscopy (SEM) revealed the presence of a silica diagenetic front at 520-530 mbsf. The position of the unconformity at this site is uncertain, but probably coincides with a change of detrital input near 548 ... : Quartz (2 Theta = 26.7°); Plagioclase (27.8-28.3°); Amphibole (10.4°); Olivine (35.6°); Corundum (39.6°); Opal-A; Opal-CT (21.8°); Pyrite (33.2°); Chlorite (12.5°); Illite (8.9°); Halite (31.7°). ...