The geological history and evolution of West Antarctica

first_imgWest Antarctica has formed the tectonically active margin between East Antarctica and the Pacific Ocean for almost half a billion years, where it has recorded a dynamic history of magmatism, continental growth and fragmentation. Despite the scale and importance of West Antarctica, there has not been an integrated view of the geology and tectonic evolution of the region as a whole. In this Review, we identify three broad physiographic provinces and present their overlapping and interconnected tectonic, magmatic and sedimentary history. The Weddell Sea region, which lays furthest from the subducting margin, was most impacted by the Jurassic initiation of Gondwana break-up. Marie Byrd Land and the West Antarctic rift system developed as a broad Cretaceous to Cenozoic continental rift system, reworking a former convergent margin. Finally, the Antarctic Peninsula and Thurston Island preserve an almost complete magmatic arc system. We conclude by briefly summarizing the geologic history of the West Antarctic system as a whole, how it provides insight into continental margin evolution and what key topics must be addressed by future research.last_img read more

Transparency data: Coronavirus cases in England: 30 December 2020

first_img case rate per 100,000 population case rate per 100,000 population aged 60 years and over percentage change in case rate per 100,000 from previous week number of people tested and weekly positivity NHS pressures by Sustainability and Transformation Partnership (STP) The data includes: More detailed epidemiological charts and graphs are presented for areas in very high and high local COVID alert level areas.See the detailed data on hospital activity.See the detailed data on the progress of the coronavirus pandemic.last_img read more