Abstract

New multichannel seismic data from Bransfield Strait, West Antarctica, image complex fan-shaped faulting patterns along the Antarctic Peninsula margin. Although a neovolcanic zone running along the strait's axis has been presumed to be a nascent spreading center and the primary focus for extension, the fan- shaped faulting pattern can be interpreted instead as evidence for intracrustal diapirism, suggesting separate, diffuse zones of extension. Further-more, the diapiric trend ∼5° divergent from that of the neovolcanic zone supports temporal and spatial evolution of stress, perhaps in response to complex plate interactions to the northeast.

You do not currently have access to this article.