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

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. Th...

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Bibliographic Details
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
Description
Summary: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°). ...

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