The Chon Aike province of Patagonia and related rocks in West Antarctica: A silicic large igneous province

An Early Permian (ca. 280Ma) silicic igneous province in the Alxa Block, NW China: A magmatic flare-up triggered by a mantle-plume?

“…Thus, the heat required to generate these crust-derived granitoids was likely supplied by the Tarim mantle plume given that the Alxa Block was probably near its margin. A similar example is the Chon Aike SLIP (188-153 Ma) (Pankhurst et al, 1998(Pankhurst et al, , 2000, which is adjacent to the Karoo-Ferrar LIP (Pankhurst et al, 2000).…”

“…During the last two decades, a significant number of SLIPs have been recognized including the Tertiary Sierra Madre Occidental of Mexico (Bryan et al, 2002), the Early Cretaceous Whitsunday igneous province (Bryan, 2007;Bryan et al, 1997Bryan et al, , 2000, the Jurassic Chon Aike Province (Pankhurst et al, 1998(Pankhurst et al, , 2000, the Paleozoic KennedyConnors-Auburn province, northeast Australia (Bryan et al, 2003) and the Mesoproterozoic Gawler SLIP, southern Australia (Allen et al, 2008;Pankhurst et al, 2011b). These SLIPs are characterized by large volumes (N10 5 km 3 ), of predominantly rhyodacite-rhyolite compositions, long periods of magmatic evolution (b40 myr) and were located along paleo-or active continental margins (Bryan, 2007;Bryan et al, 2002).…”

Cooling histories and deformation of plutonic rocks along the Liquiñe-Ofqui Fault Zone, Southern Chile (41°-42°15'S)

“…1). It intruded a late Paleozoic to early Mesozoic accretionary complex at the eastern margin of the Coastal Ranges Hervé and Fanning, 2001;Martin et al, 1999;Duhart et al, 2001), Jurassic silicic volcanic rocks of the Ibáñez Formation at the eastern fl ank of the Main Range (Pankhurst et al, 1998(Pankhurst et al, , 1999, and the overlying early Cretaceous shallow marine volcano-sedimentary rocks of the Aysén basin (De la Cruz et al, 1996;Suárez and De la Cruz, 2000).…”

International Lateinamerika-Kolloquium 2009

“…Variation in some oxides (Na and K) is due to processes of devitrification and alteration which characterize these rocks. Multielement diagrams show enrichment in Th, U and K and depression in Nb, Ba, 9 ppm) and Zr (69-154 ppm) values are low, contrasting with the relatively high-Zr and Nb (>350 ppm) contents referred by Pankhurst et al (1998) for volcanics of the Marifil Formation exposed in the eastern zone of the volcanic province.…”