Peak areas and heights for minerals of ODP Leg 113-696B (Table 1), supplement to: Lonsdale, Malcolm J (1990): The relationship between silica diagenesis, methane, and seismic reflections on the South Orkney Microcontinent. In: Barker, PF; Kennett, JP; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 113, 27-37

Malcolm J Lonsdale
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...
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